basic admin endgame view and add (#3)

Reviewed-on: #3

README.md

@@ -2,6 +2,7 @@
 
 To start your Phoenix server:
 
+* Run `docker compose up -d` to run the development database
 * Run `mix setup` to install and setup dependencies
 * Start Phoenix endpoint with `mix phx.server` or inside IEx with `iex -S mix phx.server`
 

assets/.oxfmtrc.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "./node_modules/oxfmt/configuration_schema.json",
+  "ignorePatterns": ["assets/vendor"]
+}

assets/.oxlintrc.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "plugins": ["typescript", "unicorn", "oxc"],
+  "ignorePatterns": ["assets/vendor"],
+  "categories": {
+    "correctness": "error"
+  },
+  "rules": {},
+  "env": {
+    "builtin": true
+  }
+}

assets/css/_board.css

@@ -0,0 +1,7 @@
+.bg-boardwhite {
+  background-color: #f2f5f3; /* light square */
+}
+
+.bg-boardblack {
+  background-color: #71828f; /* dark square */
+}

assets/css/_promotion.css

@@ -0,0 +1,75 @@
+.promotion-overlay {
+  position: absolute;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 100;
+  border-radius: inherit;
+}
+
+.promotion-picker {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  background: white;
+  padding: 10px;
+  border-radius: 14px;
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
+}
+
+.promotion-piece {
+  width: 80px;
+  height: 80px;
+  cursor: pointer;
+  border: 2px solid transparent;
+  border-radius: 8px;
+  background-color: #fafafa;
+  background-size: 80% 80%;
+  background-position: center;
+  background-repeat: no-repeat;
+  transition: all 0.15s ease;
+}
+
+.promotion-piece:hover {
+  background-color: #eff6ff;
+  border-color: #3b82f6;
+  transform: scale(1.08);
+}
+
+.promotion-piece:active {
+  transform: scale(0.95);
+}
+
+.promotion-piece.queen.white {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.rook.white {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.bishop.white {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.knight.white {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.queen.black {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.rook.black {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.bishop.black {
+  background-image: url("data:image/svg+xml;base64,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");
+}
+
+.promotion-piece.knight.black {
+  background-image: url("data:image/svg+xml;base64,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");
+}

assets/css/app.css

@@ -8,6 +8,9 @@
 @import "../node_modules/chessground/assets/chessground.brown.css";
 @import "../node_modules/chessground/assets/chessground.cburnett.css";
 
+@import "./_board.css";
+@import "./_promotion.css";
+
 @source "../css";
 @source "../js";
 @source "../../lib/chesstrainer_web";
@@ -108,6 +111,9 @@
 @custom-variant dark (&:where([data-theme=dark], [data-theme=dark] *));
 
 /* Make LiveView wrapper divs transparent for layout */
-[data-phx-session], [data-phx-teleported-src] { display: contents }
+[data-phx-session],
+[data-phx-teleported-src] {
+  display: contents;
+}
 
 /* This file is for your main application CSS */

assets/js/app.js

@@ -18,39 +18,39 @@
 // To load it, simply add a second `<link>` to your `root.html.heex` file.
 
 // Include phoenix_html to handle method=PUT/DELETE in forms and buttons.
-import "phoenix_html"
+import "phoenix_html";
 // Establish Phoenix Socket and LiveView configuration.
-import {Socket} from "phoenix"
+import { Socket } from "phoenix";
-import {LiveSocket} from "phoenix_live_view"
+import { LiveSocket } from "phoenix_live_view";
-import {hooks as colocatedHooks} from "phoenix-colocated/chesstrainer"
+import { hooks as colocatedHooks } from "phoenix-colocated/chesstrainer";
-import topbar from "../vendor/topbar"
+import topbar from "../vendor/topbar";
-import { ChessBoard } from "./hooks/chessBoard"
+import { ChessBoard } from "./hooks/chessBoard";
 
 let Hooks = {
   ...colocatedHooks,
-  ChessBoard
+  ChessBoard,
-}
+};
 
-const csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content")
+const csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content");
 const liveSocket = new LiveSocket("/live", Socket, {
   longPollFallbackMs: 2500,
-  params: {_csrf_token: csrfToken},
+  params: { _csrf_token: csrfToken },
   hooks: Hooks,
-})
+});
 
 // Show progress bar on live navigation and form submits
-topbar.config({barColors: {0: "#29d"}, shadowColor: "rgba(0, 0, 0, .3)"})
+topbar.config({ barColors: { 0: "#29d" }, shadowColor: "rgba(0, 0, 0, .3)" });
-window.addEventListener("phx:page-loading-start", _info => topbar.show(300))
+window.addEventListener("phx:page-loading-start", (_info) => topbar.show(300));
-window.addEventListener("phx:page-loading-stop", _info => topbar.hide())
+window.addEventListener("phx:page-loading-stop", (_info) => topbar.hide());
 
 // connect if there are any LiveViews on the page
-liveSocket.connect()
+liveSocket.connect();
 
 // expose liveSocket on window for web console debug logs and latency simulation:
 // >> liveSocket.enableDebug()
 // >> liveSocket.enableLatencySim(1000)  // enabled for duration of browser session
 // >> liveSocket.disableLatencySim()
-window.liveSocket = liveSocket
+window.liveSocket = liveSocket;
 
 // The lines below enable quality of life phoenix_live_reload
 // development features:
@@ -59,31 +59,34 @@ window.liveSocket = liveSocket
 //     2. click on elements to jump to their definitions in your code editor
 //
 if (process.env.NODE_ENV === "development") {
-  window.addEventListener("phx:live_reload:attached", ({detail: reloader}) => {
+  window.addEventListener("phx:live_reload:attached", ({ detail: reloader }) => {
     // Enable server log streaming to client.
     // Disable with reloader.disableServerLogs()
-    reloader.enableServerLogs()
+    reloader.enableServerLogs();
 
     // Open configured PLUG_EDITOR at file:line of the clicked element's HEEx component
     //
     //   * click with "c" key pressed to open at caller location
     //   * click with "d" key pressed to open at function component definition location
-    let keyDown
+    let keyDown;
-    window.addEventListener("keydown", e => keyDown = e.key)
+    window.addEventListener("keydown", (e) => (keyDown = e.key));
-    window.addEventListener("keyup", _e => keyDown = null)
+    window.addEventListener("keyup", (_e) => (keyDown = null));
-    window.addEventListener("click", e => {
+    window.addEventListener(
-      if(keyDown === "c"){
+      "click",
-        e.preventDefault()
+      (e) => {
-        e.stopImmediatePropagation()
+        if (keyDown === "c") {
-        reloader.openEditorAtCaller(e.target)
+          e.preventDefault();
-      } else if(keyDown === "d"){
+          e.stopImmediatePropagation();
-        e.preventDefault()
+          reloader.openEditorAtCaller(e.target);
-        e.stopImmediatePropagation()
+        } else if (keyDown === "d") {
-        reloader.openEditorAtDef(e.target)
+          e.preventDefault();
+          e.stopImmediatePropagation();
+          reloader.openEditorAtDef(e.target);
         }
-    }, true)
+      },
+      true,
+    );
 
-    window.liveReloader = reloader
+    window.liveReloader = reloader;
-  })
+  });
 }
-

assets/js/hooks/chessBoard.js

@@ -1,64 +1,122 @@
-import { Chessground } from 'chessground';
+import { Chessground } from "chessground";
-import { Chess } from 'chess.js';
+import { Chess } from "chess.js";
 
 export const ChessBoard = {
   mounted() {
-    // Initialize chess.js for local rule validation
     this.chess = new Chess();
 
-    // Initialize Chessground
     this.ground = Chessground(this.el, {
       fen: this.chess.fen(),
       movable: {
-        color: 'white',
+        color: "white",
-        free: false, // Don't allow completely arbitrary drops
+        free: false,
-        dests: this.getValidDests() // Only allow legal chess moves
+        dests: this.getValidDests(),
       },
       events: {
-        // Triggered when a piece is successfully dropped
+        move: (orig, dest, _capturedPiece) => {
-        move: (orig, dest, _metadata) => {
           this.handleMove(orig, dest);
-        }
+        },
+      },
+    });
+
+    this.handleEvent("set_fen", ({ fen }) => {
+      try {
+        this.chess.load(fen);
+
+        const currentTurnColor = this.chess.turn() === "w" ? "white" : "black";
+
+        this.ground.set({
+          fen: fen,
+          turnColor: currentTurnColor,
+          movable: {
+            color: currentTurnColor,
+            dests: this.getValidDests(),
+          },
+        });
+      } catch (error) {
+        console.error("Invalid FEN string submitted:", error);
+        alert("Invalid FEN configuration!");
       }
     });
   },
 
   getValidDests() {
-    // Convert chess.js moves into the Map format Chessground expects
     const dests = new Map();
-    this.chess.moves({ verbose: true }).forEach(m => {
+
+    this.chess.moves({ verbose: true }).forEach((m) => {
       if (!dests.has(m.from)) dests.set(m.from, []);
       dests.get(m.from).push(m.to);
     });
+
     return dests;
   },
 
   handleMove(orig, dest) {
-    // 1. Try to execute the move in chess.js state
+    const piece = this.ground.state.pieces.get(dest);
-    const move = this.chess.move({ from: orig, to: dest, promotion: 'q' });
+    const destRank = dest[1];
+    if (piece?.role === "pawn" && (destRank === "1" || destRank === "8")) {
+      this.showPromotionDialog(orig, dest);
+      return; // don't execute yet — wait for user choice
+    }
+    this.executeMove(orig, dest);
+  },
+
+  showPromotionDialog(orig, dest) {
+    this.pendingPromotion = { orig, dest };
+    const color = this.chess.turn() === "w" ? "white" : "black";
+    const overlay = document.createElement("div");
+    overlay.className = "promotion-overlay";
+    const picker = document.createElement("div");
+    picker.className = "promotion-picker";
+    const pieces = [
+      { type: "queen", code: "q" },
+      { type: "rook", code: "r" },
+      { type: "bishop", code: "b" },
+      { type: "knight", code: "n" },
+    ];
+    pieces.forEach(({ type, code }) => {
+      const btn = document.createElement("button");
+      btn.className = `promotion-piece ${type} ${color}`;
+      btn.addEventListener("click", () => this.completePromotion(code));
+      picker.appendChild(btn);
+    });
+    overlay.appendChild(picker);
+    const boardContainer = this.el.closest(".shadow-inner");
+    boardContainer.style.position = "relative";
+    boardContainer.appendChild(overlay);
+  },
+
+  completePromotion(pieceType) {
+    const { orig, dest } = this.pendingPromotion;
+    this.pendingPromotion = null;
+    const picker = this.el.closest(".shadow-inner")?.querySelector(".promotion-overlay");
+    if (picker) picker.remove();
+    this.executeMove(orig, dest, pieceType);
+  },
+
+  executeMove(orig, dest, promotion) {
+    const move = this.chess.move({ from: orig, to: dest, promotion });
 
     if (move) {
-      // 2. Telemetry back up to Phoenix LiveView
       this.pushEvent("move_played", {
         from: orig,
         to: dest,
-        fen: this.chess.fen() 
+        fen: this.chess.fen(),
+        san: move.san,
       });
 
-      // 3. Determine whose turn it is now ('w' or 'b')
+      const nextTurnColor = this.chess.turn() === "w" ? "white" : "black";
-      const nextTurnColor = this.chess.turn() === 'w' ? 'white' : 'black';
 
-      // 4. Force Chessground to update its internal state for the next player
       this.ground.set({
-        turnColor: nextTurnColor, // Switches turn tracking
+        turnColor: nextTurnColor,
+        fen: this.chess.fen(),
         movable: {
-          color: nextTurnColor,   // 👈 THIS IS CRITICAL: Changes who is allowed to drag pieces!
+          color: nextTurnColor,
-          dests: this.getValidDests() // Re-calculates valid legal squares for Black
+          dests: this.getValidDests(),
-        }
+        },
       });
     } else {
-      // If chess.js says it's an illegal move, snap the piece back instantly
       this.ground.set({ fen: this.chess.fen() });
     }
-  }
+  },
-}
+};

assets/package-lock.json

@@ -11,6 +11,704 @@
       "dependencies": {
         "chess.js": "^1.4.0",
         "chessground": "^9.2.1"
+      },
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+        "oxlint": "^1.70.0"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@oxfmt/binding-android-arm-eabi/-/binding-android-arm-eabi-0.55.0.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxfmt/binding-android-arm64": {
+      "version": "0.55.0",
+      "resolved": "https://registry.npmjs.org/@oxfmt/binding-android-arm64/-/binding-android-arm64-0.55.0.tgz",
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+      "cpu": [
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+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
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+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.70.0.tgz",
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+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm-musleabihf/-/binding-linux-arm-musleabihf-1.70.0.tgz",
+      "integrity": "sha512-yKy/UdbR55+M2yEcuiV5DCNC/gdQAjr/GioUy50QwBzSrKm8ueWADqyRLS9Xk+qjNeCYGg6A8FvUBds56ttfqg==",
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+      "license": "MIT",
+      "optional": true,
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+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
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+    "node_modules/@oxlint/binding-linux-arm64-gnu": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.70.0.tgz",
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+      "license": "MIT",
+      "optional": true,
+      "os": [
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+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-arm64-musl": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.70.0.tgz",
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+        "arm64"
+      ],
+      "dev": true,
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-ppc64-gnu": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.70.0.tgz",
+      "integrity": "sha512-J8VPG7I3/HmgaU4u8pNU2kFx2+0U+vPLS1dXFxXOaR/2TQ0f8AC7DRz0SRGRI1bfphnX2hVYTTtLuhL4nYKL+Q==",
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+      "libc": [
+        "glibc"
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+      "license": "MIT",
+      "optional": true,
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+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-riscv64-gnu": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-riscv64-gnu/-/binding-linux-riscv64-gnu-1.70.0.tgz",
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+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-riscv64-musl": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-riscv64-musl/-/binding-linux-riscv64-musl-1.70.0.tgz",
+      "integrity": "sha512-1e2L7cFCvx9QDzq6NPP+0tABKb5z6nWHyddWTNKprEsjO9xNrAtPowuCGpjNXxkTdsMiZ4jc8YQ5SstZd4XK6g==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-s390x-gnu": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.70.0.tgz",
+      "integrity": "sha512-Kwu/l/8GcYibCWA9m9N5pRXMIKVSsL/YbgpLzYkqDhWTiqdRfnNJ/+nqIKRKQiFbHWsdlHEhzMwruJK+qcEruA==",
+      "cpu": [
+        "s390x"
+      ],
+      "dev": true,
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-x64-gnu": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.70.0.tgz",
+      "integrity": "sha512-tap04CsHYOl0nSAQJfPNIuBxqEPB2HnhQqwaOXLg1jnp2XfRo8Fa814dA4QC4zpvTWXCjAAaCY1W5LOORkEQuQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-linux-x64-musl": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-x64-musl/-/binding-linux-x64-musl-1.70.0.tgz",
+      "integrity": "sha512-hzJa/WgvtJpbBD9rgfy0qe+MjbxOXNUT0bfR1S6EQQzfTtBFA9xg5q8KSwRrQ2QfSS+TaP4j+4mVPQrfNc6UNg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-openharmony-arm64": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-openharmony-arm64/-/binding-openharmony-arm64-1.70.0.tgz",
+      "integrity": "sha512-xbsaNSNzVSnaJACCUYr1HQMyY/Q/Q1LkePmHG3UvZPvGCYGNxrsZp9OmtA6ick8xH47ltRRbRrPCM1YXYcyC+A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openharmony"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-win32-arm64-msvc": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.70.0.tgz",
+      "integrity": "sha512-icAEsUI7JbW1TMRdEXV83mVAInhRVQYuuAlPpxdGwJ95chNdnCzjloRW8GglT0WvzOEZSio6fnYSk2DJ2Hv7LQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-win32-ia32-msvc": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-win32-ia32-msvc/-/binding-win32-ia32-msvc-1.70.0.tgz",
+      "integrity": "sha512-FHMSWbVsPVs/f+Jcl04ws4JJ2wUnauyTzlpxWRG/lSO/8GpX08Fo2gQZqdA6CrRFI+zvkxl+N/KwJGWfUwYVZA==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxlint/binding-win32-x64-msvc": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.70.0.tgz",
+      "integrity": "sha512-ptOlKwCz7n4AKs5VweMqG6DAg677FmKOK+vBkkL9DMNgFATIQ+upqUYBTOEwRQyRAx1ncGlPlXleV2hIcm3z4g==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/chess.js": {
@@ -28,6 +726,117 @@
       "funding": {
         "url": "https://lichess.org/patron"
       }
+    },
+    "node_modules/oxfmt": {
+      "version": "0.55.0",
+      "resolved": "https://registry.npmjs.org/oxfmt/-/oxfmt-0.55.0.tgz",
+      "integrity": "sha512-jSj2wCTakwgPMxkfiVZX0jf+nX+Nz6xlyAZjqNE0qXTFdCBPYlP6JAN+ODjmealw7DXBjOzYbdsqwBMAZnPZ6A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tinypool": "2.1.0"
+      },
+      "bin": {
+        "oxfmt": "bin/oxfmt"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxfmt/binding-android-arm-eabi": "0.55.0",
+        "@oxfmt/binding-android-arm64": "0.55.0",
+        "@oxfmt/binding-darwin-arm64": "0.55.0",
+        "@oxfmt/binding-darwin-x64": "0.55.0",
+        "@oxfmt/binding-freebsd-x64": "0.55.0",
+        "@oxfmt/binding-linux-arm-gnueabihf": "0.55.0",
+        "@oxfmt/binding-linux-arm-musleabihf": "0.55.0",
+        "@oxfmt/binding-linux-arm64-gnu": "0.55.0",
+        "@oxfmt/binding-linux-arm64-musl": "0.55.0",
+        "@oxfmt/binding-linux-ppc64-gnu": "0.55.0",
+        "@oxfmt/binding-linux-riscv64-gnu": "0.55.0",
+        "@oxfmt/binding-linux-riscv64-musl": "0.55.0",
+        "@oxfmt/binding-linux-s390x-gnu": "0.55.0",
+        "@oxfmt/binding-linux-x64-gnu": "0.55.0",
+        "@oxfmt/binding-linux-x64-musl": "0.55.0",
+        "@oxfmt/binding-openharmony-arm64": "0.55.0",
+        "@oxfmt/binding-win32-arm64-msvc": "0.55.0",
+        "@oxfmt/binding-win32-ia32-msvc": "0.55.0",
+        "@oxfmt/binding-win32-x64-msvc": "0.55.0"
+      },
+      "peerDependencies": {
+        "svelte": "^5.0.0",
+        "vite-plus": "*"
+      },
+      "peerDependenciesMeta": {
+        "svelte": {
+          "optional": true
+        },
+        "vite-plus": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/oxlint": {
+      "version": "1.70.0",
+      "resolved": "https://registry.npmjs.org/oxlint/-/oxlint-1.70.0.tgz",
+      "integrity": "sha512-D6JgHtzkhRwvEC+A0Nw5AEc5bk8x5i1pHzvZIEf/a0C4hOzmAACNGtkDGPyFaxxX3ZVGxCPeig3P3rMM8XU3/g==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "oxlint": "bin/oxlint"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxlint/binding-android-arm-eabi": "1.70.0",
+        "@oxlint/binding-android-arm64": "1.70.0",
+        "@oxlint/binding-darwin-arm64": "1.70.0",
+        "@oxlint/binding-darwin-x64": "1.70.0",
+        "@oxlint/binding-freebsd-x64": "1.70.0",
+        "@oxlint/binding-linux-arm-gnueabihf": "1.70.0",
+        "@oxlint/binding-linux-arm-musleabihf": "1.70.0",
+        "@oxlint/binding-linux-arm64-gnu": "1.70.0",
+        "@oxlint/binding-linux-arm64-musl": "1.70.0",
+        "@oxlint/binding-linux-ppc64-gnu": "1.70.0",
+        "@oxlint/binding-linux-riscv64-gnu": "1.70.0",
+        "@oxlint/binding-linux-riscv64-musl": "1.70.0",
+        "@oxlint/binding-linux-s390x-gnu": "1.70.0",
+        "@oxlint/binding-linux-x64-gnu": "1.70.0",
+        "@oxlint/binding-linux-x64-musl": "1.70.0",
+        "@oxlint/binding-openharmony-arm64": "1.70.0",
+        "@oxlint/binding-win32-arm64-msvc": "1.70.0",
+        "@oxlint/binding-win32-ia32-msvc": "1.70.0",
+        "@oxlint/binding-win32-x64-msvc": "1.70.0"
+      },
+      "peerDependencies": {
+        "oxlint-tsgolint": ">=0.22.1",
+        "vite-plus": "*"
+      },
+      "peerDependenciesMeta": {
+        "oxlint-tsgolint": {
+          "optional": true
+        },
+        "vite-plus": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tinypool": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/tinypool/-/tinypool-2.1.0.tgz",
+      "integrity": "sha512-Pugqs6M0m7Lv1I7FtxN4aoyToKg1C4tu+/381vH35y8oENM/Ai7f7C4StcoK4/+BSw9ebcS8jRiVrORFKCALLw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.0.0 || >=22.0.0"
+      }
     }
   }
 }

assets/package.json

@@ -7,10 +7,18 @@
   "type": "commonjs",
   "main": "index.js",
   "scripts": {
+    "fmt": "oxfmt --check",
+    "fmt:fix": "oxfmt",
+    "lint": "oxlint",
+    "lint:fix": "oxlint --fix",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "dependencies": {
     "chess.js": "^1.4.0",
     "chessground": "^9.2.1"
+  },
+  "devDependencies": {
+    "oxfmt": "^0.55.0",
+    "oxlint": "^1.70.0"
   }
 }

assets/tsconfig.json

@@ -21,7 +21,6 @@
 // Feel free to adjust this configuration however you need.
 {
   "compilerOptions": {
-    "baseUrl": ".",
     "paths": {
       "*": ["../deps/*"]
     },

assets/vendor/heroicons.js

@@ -1,43 +1,49 @@
-const plugin = require("tailwindcss/plugin")
+const plugin = require("tailwindcss/plugin");
-const fs = require("fs")
+const fs = require("fs");
-const path = require("path")
+const path = require("path");
 
-module.exports = plugin(function({matchComponents, theme}) {
+module.exports = plugin(function ({ matchComponents, theme }) {
-  let iconsDir = path.join(__dirname, "../../deps/heroicons/optimized")
+  let iconsDir = path.join(__dirname, "../../deps/heroicons/optimized");
-  let values = {}
+  let values = {};
   let icons = [
     ["", "/24/outline"],
     ["-solid", "/24/solid"],
     ["-mini", "/20/solid"],
-    ["-micro", "/16/solid"]
+    ["-micro", "/16/solid"],
-  ]
+  ];
   icons.forEach(([suffix, dir]) => {
-    fs.readdirSync(path.join(iconsDir, dir)).forEach(file => {
+    fs.readdirSync(path.join(iconsDir, dir)).forEach((file) => {
-      let name = path.basename(file, ".svg") + suffix
+      let name = path.basename(file, ".svg") + suffix;
-      values[name] = {name, fullPath: path.join(iconsDir, dir, file)}
+      values[name] = { name, fullPath: path.join(iconsDir, dir, file) };
-    })
+    });
-  })
+  });
-  matchComponents({
+  matchComponents(
-    "hero": ({name, fullPath}) => {
+    {
-      let content = fs.readFileSync(fullPath).toString().replace(/\r?\n|\r/g, "")
+      hero: ({ name, fullPath }) => {
-      content = encodeURIComponent(content)
+        let content = fs
-      let size = theme("spacing.6")
+          .readFileSync(fullPath)
+          .toString()
+          .replace(/\r?\n|\r/g, "");
+        content = encodeURIComponent(content);
+        let size = theme("spacing.6");
         if (name.endsWith("-mini")) {
-        size = theme("spacing.5")
+          size = theme("spacing.5");
         } else if (name.endsWith("-micro")) {
-        size = theme("spacing.4")
+          size = theme("spacing.4");
         }
         return {
           [`--hero-${name}`]: `url('data:image/svg+xml;utf8,${content}')`,
           "-webkit-mask": `var(--hero-${name})`,
-        "mask": `var(--hero-${name})`,
+          mask: `var(--hero-${name})`,
           "mask-repeat": "no-repeat",
           "background-color": "currentColor",
           "vertical-align": "middle",
-        "display": "inline-block",
+          display: "inline-block",
-        "width": size,
+          width: size,
-        "height": size
+          height: size,
-      }
+        };
-    }
+      },
-  }, {values})
+    },
-})
+    { values },
+  );
+});

assets/vendor/topbar.js

@@ -41,15 +41,11 @@
       ctx.shadowColor = options.shadowColor;
 
       var lineGradient = ctx.createLinearGradient(0, 0, canvas.width, 0);
-      for (var stop in options.barColors)
+      for (var stop in options.barColors) lineGradient.addColorStop(stop, options.barColors[stop]);
-        lineGradient.addColorStop(stop, options.barColors[stop]);
       ctx.lineWidth = options.barThickness;
       ctx.beginPath();
       ctx.moveTo(0, options.barThickness / 2);
-      ctx.lineTo(
+      ctx.lineTo(Math.ceil(currentProgress * canvas.width), options.barThickness / 2);
-        Math.ceil(currentProgress * canvas.width),
-        options.barThickness / 2
-      );
       ctx.strokeStyle = lineGradient;
       ctx.stroke();
     },
@@ -65,8 +61,7 @@
     },
     topbar = {
       config: function (opts) {
-        for (var key in opts)
+        for (var key in opts) if (options.hasOwnProperty(key)) options[key] = opts[key];
-          if (options.hasOwnProperty(key)) options[key] = opts[key];
       },
       show: function (delay) {
         if (showing) return;
@@ -84,9 +79,7 @@
           if (options.autoRun) {
             (function loop() {
               progressTimerId = window.requestAnimationFrame(loop);
-              topbar.progress(
+              topbar.progress("+" + 0.05 * Math.pow(1 - Math.sqrt(currentProgress), 2));
-                "+" + 0.05 * Math.pow(1 - Math.sqrt(currentProgress), 2)
-              );
             })();
           }
         }
@@ -95,9 +88,7 @@
         if (typeof to === "undefined") return currentProgress;
         if (typeof to === "string") {
           to =
-            (to.indexOf("+") >= 0 || to.indexOf("-") >= 0
+            (to.indexOf("+") >= 0 || to.indexOf("-") >= 0 ? currentProgress : 0) + parseFloat(to);
-              ? currentProgress
-              : 0) + parseFloat(to);
         }
         currentProgress = to > 1 ? 1 : to;
         repaint();
@@ -135,4 +126,4 @@
   } else {
     this.topbar = topbar;
   }
-}.call(this, window, document));
+}).call(this, window, document);

lib/chesstrainer/application.ex

@@ -15,7 +15,9 @@ defmodule Chesstrainer.Application do
       # Start a worker by calling: Chesstrainer.Worker.start_link(arg)
       # {Chesstrainer.Worker, arg},
       # Start to serve requests, typically the last entry
-      ChesstrainerWeb.Endpoint
+      ChesstrainerWeb.Endpoint,
+      {Registry, keys: :unique, name: Chesstrainer.CacheRegistry},
+      {Chesstrainer.Cache, :tablebase}
     ]
 
     # See https://elixir.hexdocs.pm/Supervisor.html

lib/chesstrainer/cache.ex

@@ -0,0 +1,101 @@
+defmodule Chesstrainer.Cache do
+  @moduledoc """
+   Generic LRU cache.
+
+  ## Examples
+
+      iex> start_link(:tablebase)
+  """
+
+  use GenServer
+
+  @max_size 1000
+  @backup_interval_minutes 60
+
+  def start_link(table), do: GenServer.start_link(__MODULE__, table, name: via_tuple(table))
+  def put(table, key, value), do: GenServer.call(via_tuple(table), {:put, key, value})
+  def get(table, key), do: GenServer.call(via_tuple(table), {:get, key})
+  def delete(table, key), do: GenServer.call(via_tuple(table), {:delete, key})
+  def backup(table), do: GenServer.cast(via_tuple(table), :backup)
+
+  def show(table) do
+    ensure_table(table)
+    :ets.tab2list(table)
+  end
+
+  def size(table), do: :ets.info(table, :size)
+
+  @impl true
+  def init(table) do
+    {:ok, table, {:continue, :restore_and_backup}}
+  end
+
+  @impl true
+  def handle_continue(:restore_and_backup, table) do
+    create_table(table)
+    __MODULE__.Persist.restore(table)
+    :timer.send_interval(:timer.minutes(@backup_interval_minutes), :backup)
+    {:noreply, table}
+  end
+
+  @impl true
+  def handle_call({:put, key, value}, _from, table) do
+    ensure_table(table)
+    timestamp = System.system_time(:millisecond)
+    :ets.insert(table, {key, value, timestamp})
+
+    GenServer.cast(self(), :maybe_evict)
+
+    {:reply, :ok, table}
+  end
+
+  @impl true
+  def handle_call({:get, key}, _from, table) do
+    ensure_table(table)
+
+    case :ets.lookup(table, key) do
+      [{^key, value, _old_timestamp}] ->
+        timestamp = System.system_time(:millisecond)
+        :ets.insert(table, {key, value, timestamp})
+        {:reply, {:ok, value}, table}
+
+      [] ->
+        {:reply, :error, table}
+    end
+  end
+
+  @impl true
+  def handle_call({:delete, key}, _from, table) do
+    :ets.delete(table, key)
+    {:reply, :ok, table}
+  end
+
+  @impl true
+  def handle_cast(:maybe_evict, table) do
+    __MODULE__.Evict.maybe_evict_oldest(table, @max_size)
+    {:noreply, table}
+  end
+
+  @impl true
+  def handle_cast(:backup, table) do
+    __MODULE__.Persist.backup(table)
+    {:noreply, table}
+  end
+
+  @impl true
+  def handle_info(:backup, table) do
+    GenServer.cast(self(), :backup)
+    {:noreply, table}
+  end
+
+  defp via_tuple(table), do: {:via, Registry, {Chesstrainer.CacheRegistry, table}}
+
+  defp ensure_table(table) do
+    case :ets.whereis(table) do
+      :undefined -> create_table(table)
+      _ -> :ok
+    end
+  end
+
+  defp create_table(table), do: :ets.new(table, [:named_table, :public, :set])
+end

lib/chesstrainer/cache/evict.ex

@@ -0,0 +1,29 @@
+defmodule Chesstrainer.Cache.Evict do
+  @moduledoc """
+  Eviction functions for LRU cache
+  """
+
+  # O(n) time, not efficient
+  def maybe_evict_oldest(table, max_size) do
+    if :ets.info(table, :size) > max_size do
+      case find_oldest_entry(table) do
+        {oldest_key, _} -> :ets.delete(table, oldest_key)
+        _ -> :ok
+      end
+    end
+  end
+
+  defp find_oldest_entry(table) do
+    :ets.foldl(
+      fn {k, _v, t}, acc ->
+        case acc do
+          nil -> {k, t}
+          {_, oldest_t} when t < oldest_t -> {k, t}
+          _ -> acc
+        end
+      end,
+      nil,
+      table
+    )
+  end
+end

lib/chesstrainer/cache/persist.ex

@@ -0,0 +1,29 @@
+defmodule Chesstrainer.Cache.Persist do
+  @moduledoc """
+  Persistance for cache. Backup and restore functions.
+  """
+
+  @backup_path "priv/static/backups"
+
+  def backup(table) do
+    File.mkdir_p!(@backup_path)
+    filename = Path.join(@backup_path, "#{table}.det") |> String.to_charlist()
+    {:ok, dets_table} = :dets.open_file(filename, type: :set)
+    :ets.to_dets(table, dets_table)
+    :dets.sync(dets_table)
+  end
+
+  def restore(table) do
+    File.mkdir_p!(@backup_path)
+    filename = Path.join(@backup_path, "#{table}.det") |> String.to_charlist()
+
+    case :dets.open_file(table, file: filename, type: :set) do
+      {:ok, ^table} ->
+        :dets.foldl(fn entry, _ -> :ets.insert(table, entry) end, :ok, table)
+        :dets.close(table)
+
+      {:error, _} ->
+        :ok
+    end
+  end
+end

lib/chesstrainer/endgames.ex

@@ -0,0 +1,123 @@
+defmodule Chesstrainer.Endgames do
+  @moduledoc """
+  The Endgames context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Chesstrainer.Repo
+
+  alias Chesstrainer.Endgames.Endgame
+
+  @doc """
+  Returns the list of endgames.
+
+  ## Examples
+
+      iex> list_endgames()
+      [%Endgame{}, ...]
+
+  """
+  def list_endgames do
+    Repo.all(Endgame)
+  end
+
+  @doc """
+  Gets a single endgame.
+
+  Raises `Ecto.NoResultsError` if the Endgame does not exist.
+
+  ## Examples
+
+      iex> get_endgame!(123)
+      %Endgame{}
+
+      iex> get_endgame!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_endgame!(id), do: Repo.get!(Endgame, id)
+
+  @doc """
+  Creates a endgame.
+
+  ## Examples
+
+      iex> create_endgame(%{field: value})
+      {:ok, %Endgame{}}
+
+      iex> create_endgame(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_endgame(attrs) do
+    %Endgame{}
+    |> Endgame.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a endgame.
+
+  ## Examples
+
+      iex> update_endgame(endgame, %{field: new_value})
+      {:ok, %Endgame{}}
+
+      iex> update_endgame(endgame, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_endgame(%Endgame{} = endgame, attrs) do
+    # ignore fen on update
+    attrs = Map.delete(attrs, "fen")
+
+    endgame
+    |> Endgame.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a endgame.
+
+  ## Examples
+
+      iex> delete_endgame(endgame)
+      {:ok, %Endgame{}}
+
+      iex> delete_endgame(endgame)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_endgame(%Endgame{} = endgame) do
+    Repo.delete(endgame)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking endgame changes.
+
+  ## Examples
+
+      iex> change_endgame(endgame)
+      %Ecto.Changeset{data: %Endgame{}}
+
+  """
+  def change_endgame(%Endgame{} = endgame, attrs \\ %{}) do
+    Endgame.changeset(endgame, attrs)
+  end
+
+  def add_tag(endgame, tag) do
+    endgame
+    |> Repo.preload(:tags)
+    |> Ecto.Changeset.change()
+    |> Ecto.Changeset.put_assoc(:tags, [tag | endgame.tags])
+    |> Repo.update()
+  end
+
+  def remove_tag(endgame, tag) do
+    endgame
+    |> Repo.preload(:tags)
+    |> Ecto.Changeset.change()
+    |> Ecto.Changeset.put_assoc(:tags, endgame.tags -- [tag])
+    |> Repo.update()
+  end
+end

lib/chesstrainer/endgames/endgame.ex

@@ -0,0 +1,41 @@
+defmodule Chesstrainer.Endgames.Endgame do
+  @moduledoc """
+  A singular endgame entry
+  """
+
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+  @foreign_key_type :binary_id
+  schema "endgames" do
+    field :fen, :string
+    field :color, Ecto.Enum, values: [:white, :black]
+    field :key, :string
+    field :message, :string
+    field :notes, :string
+    field :result, Ecto.Enum, values: [:win, :loss, :draw]
+    field :rating, :integer
+    field :rating_deviation, :integer
+    field :times_attempted, :integer
+    field :times_solved, :integer
+
+    many_to_many :tags, Chesstrainer.Tags.Tag,
+      join_through: "endgames_tags",
+      on_replace: :delete
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  def changeset(endgame, attrs) do
+    endgame
+    |> cast(attrs, [:fen, :key, :message, :notes, :result, :rating, :color])
+    |> validate_required([:fen, :color], message: "Invalid FEN")
+    |> validate_required([:key, :result, :rating])
+    |> validate_format(:key, ~r/^(?=.{5,10}$)KQ*R*[NB]*P*\sv\sKQ*R*[NB]*P*$/,
+      message: "Key must follow pattern KQ.. v KQR.., max pieces 7"
+    )
+    |> unique_constraint(:fen, message: "FEN already exists")
+  end
+end

lib/chesstrainer/endgames/tablebase.ex

@@ -0,0 +1,57 @@
+defmodule Chesstrainer.Endgames.Tablebase do
+  @moduledoc """
+  All endgame tablebase related functions.
+  """
+
+  alias Chesstrainer.Endgames.Tablebase
+
+  @type result :: :win | :draw | :loss | :unknown
+
+  @type t :: %__MODULE__{
+          category: result,
+          checkmate: boolean(),
+          dtc: integer() | nil,
+          dtm: integer() | nil,
+          dtw: integer() | nil,
+          dtz: integer() | nil,
+          insufficient_material: boolean(),
+          moves: [Tablebase.Move.t()]
+        }
+
+  defstruct category: nil,
+            checkmate: false,
+            dtc: nil,
+            dtm: nil,
+            dtw: nil,
+            dtz: nil,
+            insufficient_material: false,
+            moves: nil
+
+  @spec new(String.t()) ::
+          {:ok, t()}
+          | {:cooldown, non_neg_integer()}
+          | {:error, :invalid_endgame}
+          | {:error, term()}
+  def new(fen) do
+    case Tablebase.Cache.get(fen) do
+      {_fen, tablebase} ->
+        {:cache, tablebase}
+
+      _ ->
+        case Tablebase.Parser.from_fen(fen) do
+          {:error, reason} ->
+            {:error, reason}
+
+          {:cooldown, remaining_ms} ->
+            {:cooldown, remaining_ms}
+
+          {:ok, tablebase} when tablebase.category == :unknown ->
+            {:error, :invalid_endgame}
+
+          {:ok, tablebase} ->
+            Tablebase.Cache.put(fen, tablebase)
+            {:ok, tablebase}
+        end
+    end
+  end
+end

lib/chesstrainer/endgames/tablebase/cache.ex

@@ -0,0 +1,17 @@
+defmodule Chesstrainer.Endgames.Tablebase.Cache do
+  @moduledoc """
+  A cache of tablebases by FEN.
+  """
+
+  alias Chesstrainer.Cache
+
+  @table :tablebase
+
+  def put(fen, tablebase), do: Cache.put(@table, fen, tablebase)
+
+  def get(fen), do: Cache.get(@table, fen)
+
+  def delete(fen), do: Cache.delete(@table, fen)
+  def show, do: Cache.show(@table)
+  def size, do: Cache.size(@table)
+end

lib/chesstrainer/endgames/tablebase/move.ex

@@ -0,0 +1,41 @@
+defmodule Chesstrainer.Endgames.Tablebase.Move do
+  @moduledoc """
+  Moves struct for the tablebase
+  """
+
+  @type result :: :win | :draw | :loss
+
+  @type t :: %__MODULE__{
+          category: result,
+          checkmate: boolean(),
+          conversion: boolean(),
+          dtc: integer() | nil,
+          dtm: integer() | nil,
+          dtw: integer() | nil,
+          dtz: integer() | nil,
+          precise_dtz: integer() | nil,
+          san: String.t() | nil,
+          stalemate: boolean(),
+          uci: String.t() | nil,
+          variant_loss: boolean(),
+          variant_win: boolean(),
+          zeroing: boolean(),
+          insufficient_material: boolean()
+        }
+
+  defstruct category: nil,
+            checkmate: false,
+            conversion: false,
+            dtc: nil,
+            dtm: nil,
+            dtw: nil,
+            dtz: nil,
+            precise_dtz: nil,
+            san: nil,
+            stalemate: false,
+            uci: nil,
+            variant_loss: false,
+            variant_win: false,
+            zeroing: false,
+            insufficient_material: false
+end

lib/chesstrainer/endgames/tablebase/parser.ex

@@ -0,0 +1,106 @@
+defmodule Chesstrainer.Endgames.Tablebase.Parser do
+  @moduledoc """
+  Fetch and parse tablebase data to fit the tablebase struct
+
+  Lichess tablebase response from FEN string.
+  https://lichess.org/api#tag/tablebase
+
+  FEN must have spaces replaced by underscores to satisfy the Lichess API.
+  """
+
+  import Chesstrainer.Ratelimiters
+  alias Chesstrainer.Endgames.Tablebase
+
+  @lichess_tablebase_url "http://tablebase.lichess.ovh/standard?fen="
+
+  @spec from_fen(String.t()) ::
+          {:ok, Tablebase.t()} | {:cooldown, non_neg_integer()} | {:error, term()}
+  def from_fen(fen) do
+    case lichess_check_cooldown() do
+      {:ok, 0} -> tablebase_response(fen)
+      {:cooldown, remaining_ms} -> {:cooldown, remaining_ms}
+    end
+  end
+
+  @spec tablebase_response(String.t()) :: {:ok, Tablebase.t()} | {:error, term()}
+  defp tablebase_response(fen) do
+    response =
+      fen
+      |> sanitise_fen()
+      |> build_request_string()
+      |> Req.get()
+      |> parse_response()
+
+    case response do
+      {:ok, body} -> from_map(body)
+      {:error, reason} -> {:error, reason}
+    end
+  end
+
+  # exposed for testing
+  def from_map(map) do
+    {:ok,
+     %Tablebase{
+       category: map["category"] |> String.to_atom(),
+       checkmate: map["checkmate"],
+       dtc: map["dtc"],
+       dtm: map["dtm"],
+       dtw: map["dtw"],
+       dtz: map["dtz"],
+       insufficient_material: map["insufficient_material"],
+       moves: Enum.map(map["moves"], &moves_from_map/1)
+     }}
+  end
+
+  defp moves_from_map(map) do
+    %Tablebase.Move{
+      category: map["category"] |> String.to_atom(),
+      checkmate: map["checkmate"],
+      conversion: map["conversion"],
+      dtc: map["dtc"],
+      dtm: map["dtm"],
+      dtw: map["dtw"],
+      dtz: map["dtz"],
+      insufficient_material: map["insufficient_material"],
+      precise_dtz: map["precise_dtz"],
+      san: map["san"],
+      stalemate: map["stalemate"],
+      uci: map["uci"],
+      variant_loss: map["variant_loss"],
+      variant_win: map["variant_win"],
+      zeroing: map["zeroing"]
+    }
+  end
+
+  defp parse_response(response) do
+    case response do
+      # Success
+      {:ok, %Req.Response{status: 200, body: body}} ->
+        {:ok, body}
+
+      # Client errors
+      {:ok, %Req.Response{status: status, body: body}} when status in 400..499 ->
+        {:error, {:client_error, status, body}}
+
+      # Rate limiting
+      {:ok, %Req.Response{status: 429, body: body}} ->
+        lichess_add_cooldown()
+        {:error, {:too_many_requests, 429, body}}
+
+      # Server errors
+      {:ok, %Req.Response{status: status, body: body}} when status in 500..599 ->
+        {:error, {:server_error, status, body}}
+
+      # Catch‑all for other status codes
+      {:ok, %Req.Response{status: status, body: body}} ->
+        {:error, {:http_error, status, body}}
+
+      # Network / client‑side failure
+      {:error, reason} ->
+        {:error, reason}
+    end
+  end
+
+  defp sanitise_fen(fen), do: String.replace(fen, " ", "_")
+  defp build_request_string(fen), do: "#{@lichess_tablebase_url}#{fen}"
+end

lib/chesstrainer/fen.ex

@@ -0,0 +1,13 @@
+defmodule Chesstrainer.FEN do
+  @spec color_from_fen(String.t()) :: :white | :black | nil
+  def color_from_fen(fen) do
+    fen
+    |> String.split(" ")
+    |> Enum.at(1)
+    |> color_initial_to_color_atom()
+  end
+
+  defp color_initial_to_color_atom("b"), do: :black
+  defp color_initial_to_color_atom("w"), do: :white
+  defp color_initial_to_color_atom(_), do: nil
+end

lib/chesstrainer/game.ex

@@ -0,0 +1,145 @@
+defmodule Chesstrainer.Game do
+  @moduledoc """
+  Game related functions
+  """
+  alias Chesstrainer.Endgames
+
+  @type game_type :: :endgame
+  @type square :: {atom(), pos_integer()}
+  @type move :: {square, square}
+  @type colors :: :white | :black
+  @type game_state :: :continue | :loss | :draw
+  @type result :: :win | :draw | :loss
+
+  @type t :: %__MODULE__{
+          player_color: colors,
+          board: map(),
+          active_color: colors,
+          castling: list(),
+          en_passant: term() | nil,
+          moves: list(),
+          halfmove_clock: non_neg_integer(),
+          fullmove_clock: non_neg_integer(),
+          captures: list(),
+          check: term() | nil,
+          result: result,
+          pgn: String.t() | nil,
+          orientation: colors,
+          move_from_square: square,
+          move_to_square: square,
+          game_type: game_type,
+          fen: String.t(),
+          tablebase: term(),
+          game_state: game_state
+        }
+
+  defstruct board: %{},
+            player_color: :white,
+            active_color: :white,
+            castling: [],
+            en_passant: nil,
+            moves: [],
+            halfmove_clock: 0,
+            fullmove_clock: 0,
+            captures: [],
+            check: nil,
+            result: nil,
+            pgn: nil,
+            orientation: :white,
+            move_from_square: nil,
+            move_to_square: nil,
+            game_type: nil,
+            fen: nil,
+            tablebase: nil,
+            game_state: :continue
+
+  @doc """
+  Builds a `%ChessTrainer.Game{}` from a FEN string.
+
+  On success, returns `{:ok, game}` with the parsed board state.
+
+  If the FEN string is invalid, `Chex.Parser.FEN.parse/1` raises a
+  `MatchError`. This function rescues that exception and returns
+  `{:error, :invalid_fen, game}`, where `game` is a fallback position
+  containing only kings.
+
+  This is a bad implementation in the Chex libary and should be fixed at our fork:
+  https://github.com/therealowenrees/chex
+
+  We should return something like{:ok, game} | {:error | :invalid_fen}
+
+  ## Examples
+
+      iex> ChessTrainer.Game.game_from_fen("valid fen", :endgame)
+      {:ok, %ChessTrainer.Game{}}
+
+      iex> ChessTrainer.Game.game_from_fen("invalid fen", :endgame)
+      {:error, :invalid_fen, %ChessTrainer.Game{}}
+
+  """
+  @dialyzer {:nowarn_function, game_from_fen: 2}
+  @spec game_from_fen(String.t(), game_type()) :: {:ok, t()} | {:error, :invalid_fen, t()}
+  def game_from_fen(fen, game_type) do
+    try do
+      {:ok, %Chex.Game{} = chex_game} = Chex.Parser.FEN.parse(fen)
+
+      game = %__MODULE__{
+        board: chex_game.board,
+        player_color: chex_game.active_color,
+        active_color: chex_game.active_color,
+        castling: chex_game.castling,
+        en_passant: chex_game.en_passant,
+        moves: chex_game.moves,
+        halfmove_clock: chex_game.halfmove_clock,
+        fullmove_clock: chex_game.fullmove_clock,
+        captures: chex_game.captures,
+        check: chex_game.check,
+        result: chex_game.result,
+        pgn: chex_game.pgn,
+        orientation: chex_game.active_color,
+        move_from_square: nil,
+        move_to_square: nil,
+        game_type: game_type,
+        fen: fen,
+        game_state: :continue,
+        tablebase:
+          if game_type === :endgame do
+            Endgames.Tablebase.new(fen)
+          else
+            nil
+          end
+      }
+
+      {:ok, game}
+    rescue
+      # if a MatchError error is raised, then return a game with only kings on the board
+      MatchError ->
+        game = %__MODULE__{
+          board: %{
+            {:e, 1} => {:king, :white, {:e, 1}},
+            {:e, 8} => {:king, :black, {:e, 8}}
+          },
+          player_color: :white,
+          active_color: :white,
+          castling: [],
+          en_passant: nil,
+          moves: [],
+          halfmove_clock: 0,
+          fullmove_clock: 0,
+          captures: nil,
+          check: nil,
+          result: :draw,
+          pgn: nil,
+          orientation: :white,
+          move_from_square: nil,
+          move_to_square: nil,
+          game_type: :endgame,
+          fen: "4k3/8/8/8/8/8/8/4K3 w - - 0 1",
+          game_state: :draw,
+          tablebase: nil
+        }
+
+        {:error, :invalid_fen, game}
+    end
+  end
+end

lib/chesstrainer/ratelimiters.ex

@@ -0,0 +1,48 @@
+defmodule Chesstrainer.Ratelimiters do
+  @moduledoc """
+  Generic rate limiter for external APIs (e.g., Lichess).
+
+  This module exposes convenience functions for each external API
+  that delegate to their specific rate limiter implementation.
+
+  ## Examples
+
+      iex> ChessTrainer.Ratelimiters.lichess_reset_cooldown()
+      true
+
+      iex> ChessTrainer.Ratelimiters.lichess_check_cooldown()
+      {:ok, 0}
+
+      iex> ChessTrainer.Ratelimiters.lichess_add_cooldown()
+      true
+  """
+
+  alias Chesstrainer.Ratelimiters.Lichess
+
+  @doc """
+  Adds a cooldown entry for the Lichess API.
+
+  This sets the cooldown period (e.g. 60 seconds) starting from now.
+  Useful when a `429 Too Many Requests` response is received.
+  """
+  @spec lichess_add_cooldown() :: boolean()
+  def lichess_add_cooldown, do: Lichess.add_cooldown()
+
+  @doc """
+  Resets the cooldown for the Lichess API.
+
+  This clears any existing cooldown, allowing requests immediately.
+  """
+  @spec lichess_reset_cooldown() :: boolean()
+  def lichess_reset_cooldown, do: Lichess.reset_cooldown()
+
+  @doc """
+  Checks whether the Lichess API is currently under cooldown.
+
+  Returns:
+    * `{:ok, 0}` if no cooldown is active
+    * `{:cooldown, remaining_ms}` if still cooling down, with the remaining time in milliseconds
+  """
+  @spec lichess_check_cooldown() :: {:ok, non_neg_integer} | {:cooldown, non_neg_integer}
+  def lichess_check_cooldown, do: Lichess.check_cooldown()
+end

lib/chesstrainer/ratelimiters/lichess.ex

@@ -0,0 +1,55 @@
+defmodule Chesstrainer.Ratelimiters.Lichess do
+  @moduledoc """
+  Global rate limiter for 429 response codes from the Lichess API.
+  """
+
+  @cooldown_seconds 60
+  @table :lichess_cooldown
+
+  def add_cooldown do
+    ensure_table()
+    insert_cooldown()
+  end
+
+  def reset_cooldown do
+    ensure_table()
+    :ets.insert(@table, {:until, nil})
+  end
+
+  def check_cooldown do
+    ensure_table()
+    current_ms = System.system_time(:millisecond)
+
+    case :ets.lookup(@table, :until) do
+      [{:until, nil}] ->
+        {:ok, 0}
+
+      [{:until, until_ms}] ->
+        remaining = until_ms - current_ms
+
+        if remaining <= 0 do
+          reset_cooldown()
+          {:ok, 0}
+        else
+          {:cooldown, remaining}
+        end
+    end
+  end
+
+  defp create do
+    :ets.new(@table, [:named_table, :public, :set])
+    :ets.insert(@table, {:until, nil})
+  end
+
+  defp ensure_table do
+    case :ets.whereis(@table) do
+      :undefined -> create()
+      _ -> :ok
+    end
+  end
+
+  defp insert_cooldown do
+    until_ms = System.system_time(:millisecond) + @cooldown_seconds * 1000
+    :ets.insert(@table, {:until, until_ms})
+  end
+end

lib/chesstrainer/tags.ex

@@ -0,0 +1,104 @@
+defmodule Chesstrainer.Tags do
+  @moduledoc """
+  The Tags context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Chesstrainer.Repo
+
+  alias Chesstrainer.Tags.Tag
+
+  @doc """
+  Returns the list of tags.
+
+  ## Examples
+
+      iex> list_tags()
+      [%Tag{}, ...]
+
+  """
+  def list_tags do
+    Repo.all(Tag)
+  end
+
+  @doc """
+  Gets a single tag.
+
+  Raises `Ecto.NoResultsError` if the Tag does not exist.
+
+  ## Examples
+
+      iex> get_tag!(123)
+      %Tag{}
+
+      iex> get_tag!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_tag!(id), do: Repo.get!(Tag, id)
+
+  @doc """
+  Creates a tag.
+
+  ## Examples
+
+      iex> create_tag(%{field: value})
+      {:ok, %Tag{}}
+
+      iex> create_tag(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_tag(attrs) do
+    %Tag{}
+    |> Tag.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a tag.
+
+  ## Examples
+
+      iex> update_tag(tag, %{field: new_value})
+      {:ok, %Tag{}}
+
+      iex> update_tag(tag, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_tag(%Tag{} = tag, attrs) do
+    tag
+    |> Tag.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a tag.
+
+  ## Examples
+
+      iex> delete_tag(tag)
+      {:ok, %Tag{}}
+
+      iex> delete_tag(tag)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_tag(%Tag{} = tag) do
+    Repo.delete(tag)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking tag changes.
+
+  ## Examples
+
+      iex> change_tag(tag)
+      %Ecto.Changeset{data: %Tag{}}
+
+  """
+  def change_tag(%Tag{} = tag, attrs \\ %{}) do
+    Tag.changeset(tag, attrs)
+  end
+end

lib/chesstrainer/tags/tag.ex

@@ -0,0 +1,19 @@
+defmodule Chesstrainer.Tags.Tag do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "tags" do
+    field :name, :string
+    field :category, Ecto.Enum, values: [endgame: "endgame", opening: "opening", tactic: "tactic"]
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  def changeset(tag, attrs) do
+    tag
+    |> cast(attrs, [:name, :category])
+    |> validate_required([:name, :category])
+    |> unique_constraint(:name)
+  end
+end

lib/chesstrainer_web/components/board/board_component.ex

@@ -0,0 +1,55 @@
+defmodule ChesstrainerWeb.Board.BoardComponent do
+  @moduledoc """
+  Chess board component
+  """
+
+  use Phoenix.Component
+  import ChesstrainerWeb.Board.SquareComponent
+
+  attr :game, :map, required: true
+
+  attr :myself, :any, required: true
+
+  def board(assigns) do
+    files_list = [:a, :b, :c, :d, :e, :f, :g, :h]
+
+    assigns =
+      assigns
+      |> assign(:files_list, files_list)
+      |> assign(
+        :files,
+        case assigns.game.orientation do
+          :white -> files_list
+          :black -> Enum.reverse(files_list)
+        end
+      )
+      |> assign(
+        :ranks,
+        case assigns.game.orientation do
+          :white -> Enum.reverse(1..8)
+          :black -> 1..8
+        end
+      )
+
+    ~H"""
+    <div class="w-[388px] m-auto left-0 right-0 mt-6">
+      <div class="border border-2 border-zinc-700 grid grid-rows-8 grid-cols-8">
+        <%= for rank <- @ranks do %>
+          <%= for file <- @files do %>
+            <% square = {file, rank} %>
+            <% piece = Map.get(@game.board, square) %>
+            <.square
+              file={file}
+              rank={rank}
+              piece={piece}
+              files_list={@files_list}
+              move_from_square={@game.move_from_square}
+              myself={@myself}
+            />
+          <% end %>
+        <% end %>
+      </div>
+    </div>
+    """
+  end
+end

lib/chesstrainer_web/components/board/piece_component.ex

@@ -0,0 +1,33 @@
+defmodule ChesstrainerWeb.Board.PieceComponent do
+  @moduledoc """
+  Chess pieces component
+  """
+  use Phoenix.Component
+
+  attr :piece, :any, required: true
+  attr :class, :string, default: ""
+
+  def piece(assigns) do
+    assigns = assign(assigns, :path, piece_path(assigns.piece))
+
+    ~H"""
+    <%= if @path do %>
+      <img src={@path} class={@class} />
+    <% end %>
+    """
+  end
+
+  def piece_path({:king, :white, _square}), do: "/images/pieces/white/king.svg"
+  def piece_path({:queen, :white, _square}), do: "/images/pieces/white/queen.svg"
+  def piece_path({:rook, :white, _square}), do: "/images/pieces/white/rook.svg"
+  def piece_path({:bishop, :white, _square}), do: "/images/pieces/white/bishop.svg"
+  def piece_path({:knight, :white, _square}), do: "/images/pieces/white/knight.svg"
+  def piece_path({:pawn, :white, _square}), do: "/images/pieces/white/pawn.svg"
+  def piece_path({:king, :black, _square}), do: "/images/pieces/black/king.svg"
+  def piece_path({:queen, :black, _square}), do: "/images/pieces/black/queen.svg"
+  def piece_path({:rook, :black, _square}), do: "/images/pieces/black/rook.svg"
+  def piece_path({:bishop, :black, _square}), do: "/images/pieces/black/bishop.svg"
+  def piece_path({:knight, :black, _square}), do: "/images/pieces/black/knight.svg"
+  def piece_path({:pawn, :black, _square}), do: "/images/pieces/black/pawn.svg"
+  def piece_path(_), do: nil
+end

lib/chesstrainer_web/components/board/square_component.ex

@@ -0,0 +1,48 @@
+defmodule ChesstrainerWeb.Board.SquareComponent do
+  @moduledoc """
+  Renders a single chess square with optional piece and highlighting.
+  """
+  use Phoenix.Component
+  import ChesstrainerWeb.Board.PieceComponent
+
+  attr :file, :atom, required: true
+  attr :rank, :integer, required: true
+  attr :piece, :any, default: nil
+  attr :files_list, :list, required: true
+  attr :move_from_square, :any, default: nil
+  attr :myself, :any, required: true
+
+  def square(assigns) do
+    current_square = {assigns.file, assigns.rank}
+
+    assigns =
+      assigns
+      |> assign(:highlight_square, current_square === assigns.move_from_square)
+
+    ~H"""
+    <div
+      class={[
+        "w-12 h-12 flex items-center justify-center",
+        background(
+          Enum.find_index(@files_list, fn f -> f == @file end),
+          @rank - 1
+        ),
+        highlight_square(@highlight_square)
+      ]}
+      phx-click="square-click"
+      phx-value-file={@file}
+      phx-value-rank={@rank}
+      phx-value-type="move"
+      phx-target={@myself}
+    >
+      <.piece piece={@piece} class="w-10 h-10" />
+    </div>
+    """
+  end
+
+  def background(file_idx, rank_idx) when rem(file_idx + rank_idx, 2) != 0, do: "bg-boardwhite"
+  def background(_, _), do: "bg-boardblack"
+
+  def highlight_square(true), do: "ring-inset ring-2 ring-yellow-400"
+  def highlight_square(false), do: ""
+end

lib/chesstrainer_web/live/chess_test_live.ex

@@ -3,7 +3,7 @@ defmodule ChesstrainerWeb.ChessTestLive do
 
   @impl true
   def mount(_params, _session, socket) do
-    {:ok, assign(socket, last_move: "None yet", total_moves: 0)}
+    {:ok, assign(socket, last_move: "None yet", san: "None yet", move_list: [])}
   end
 
   @impl true
@@ -12,14 +12,36 @@ defmodule ChesstrainerWeb.ChessTestLive do
     <div class="mx-auto max-w-2xl p-6">
       <h1 class="text-2xl font-bold mb-4">Chessground LiveView Test</h1>
 
+      <form phx-submit="load_fen" class="mb-6 flex gap-2 bg-gray-50 p-4 rounded-lg shadow-sm">
+        <div class="flex-1">
+          <input
+            type="text"
+            name="fen"
+            placeholder="Paste FEN string here (e.g., rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1)"
+            class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 font-mono text-sm"
+            required
+          />
+        </div>
+        <button
+          type="submit"
+          class="px-4 py-2 bg-blue-600 text-white font-medium rounded-md hover:bg-blue-700 transition"
+        >
+          Load FEN
+        </button>
+      </form>
+
       <div class="bg-gray-100 p-4 rounded mb-4 flex justify-between items-center shadow-sm">
         <div>
           <p class="text-sm text-gray-600 font-semibold">Last Played Move:</p>
           <p class="text-lg font-mono text-blue-600">{@last_move}</p>
-        </div>
+          <p class="text-lg font-mono text-blue-600">{@san}</p>
-        <div>
+          <p class="text-lg font-mono text-emerald-600">
-          <p class="text-sm text-gray-600 font-semibold">Total Moves:</p>
+            {if length(@move_list) == 0 do
-          <p class="text-lg font-bold">{@total_moves}</p>
+              "No Moves"
+            else
+              Enum.reverse(@move_list) |> Enum.join(", ")
+            end}
+          </p>
         </div>
       </div>
 
@@ -37,11 +59,29 @@ defmodule ChesstrainerWeb.ChessTestLive do
   end
 
   @impl true
-  def handle_event("move_played", %{"from" => from, "to" => to, "fen" => _fen}, socket) do
+  def handle_event("load_fen", %{"fen" => fen}, socket) do
-    # Receive the payload sent from the client JS Hook via this.pushEvent
+    clean_fen = String.trim(fen)
+
+    {:noreply,
+     socket
+     |> assign(:last_move, "Position Loaded")
+     |> assign(:san, "None yet")
+     |> assign(:move_list, [])
+     |> push_event("set_fen", %{fen: clean_fen})}
+  end
+
+  @impl true
+  def handle_event(
+        "move_played",
+        %{"from" => from, "to" => to, "fen" => _fen, "san" => san},
+        socket
+      ) do
+    current_moves = socket.assigns.move_list
+
     {:noreply,
      socket
      |> assign(:last_move, "#{from} ➔ #{to}")
-     |> assign(:total_moves, socket.assigns.total_moves + 1)}
+     |> assign(:san, san)
+     |> assign(:move_list, [san | current_moves])}
   end
 end

lib/chesstrainer_web/live/endgame_live/form.ex

@@ -0,0 +1,212 @@
+defmodule ChesstrainerWeb.EndgameLive.Form do
+  use ChesstrainerWeb, :live_view
+
+  alias Chesstrainer.Repo
+  alias Chesstrainer.Tags
+  alias Chesstrainer.FEN
+  alias Chesstrainer.Endgames
+  alias Chesstrainer.Endgames.Endgame
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <Layouts.app flash={@flash}>
+      <.header>
+        {@page_title}
+        <:subtitle>Use this form to manage endgame records in your database.</:subtitle>
+      </.header>
+
+      <.form for={@form} id="endgame-form" phx-change="validate" phx-submit="save">
+        <.input field={@form[:fen]} type="text" label="Fen" disabled={@live_action == :edit} />
+        <.input field={@form[:color]} type="text" label="Color" disabled />
+        <.input field={@form[:key]} type="text" label="Key" />
+        <.input field={@form[:rating]} type="number" label="Rating" />
+
+        <!-- ✅ TAG SELECTOR -->
+        <div class="field">
+          <label>Tags</label>
+
+          <!-- Search box -->
+          <input
+            type="text"
+            name="tag_search"
+            value={@tag_query}
+            phx-change="search_tags"
+            autocomplete="off"
+          />
+
+          <!-- Search results -->
+          <ul class="tag-results">
+            <%= for tag <- @tag_results do %>
+              <li phx-click="add_tag" phx-value-id={tag.id}>
+                {tag.name}
+              </li>
+            <% end %>
+
+            <%= if @tag_query != "" and @tag_results == [] do %>
+              <li phx-click="create_tag" phx-value-name={@tag_query}>
+                Create tag "{@tag_query}"
+              </li>
+            <% end %>
+          </ul>
+
+          <!-- Selected tags -->
+          <div class="selected-tags">
+            <%= for tag <- @endgame.tags do %>
+              <span class="tag">
+                {tag.name}
+                <button type="button" phx-click="remove_tag" phx-value-id={tag.id}>×</button>
+              </span>
+            <% end %>
+          </div>
+        </div>
+
+        <.input field={@form[:message]} type="textarea" label="Message" />
+        <.input field={@form[:notes]} type="textarea" label="Notes" />
+        <.input
+          field={@form[:result]}
+          type="select"
+          options={[
+            {"Win", :win},
+            {"Draw", :draw},
+            {"Loss", :loss}
+          ]}
+          label="Result"
+        />
+        <footer>
+          <.button phx-disable-with="Saving..." variant="primary">Save Endgame</.button>
+          <.button navigate={return_path(@return_to, @endgame)}>Cancel</.button>
+        </footer>
+      </.form>
+    </Layouts.app>
+    """
+  end
+
+  @impl true
+  def mount(params, _session, socket) do
+    {:ok,
+     socket
+     |> assign(:return_to, return_to(params["return_to"]))
+     |> apply_action(socket.assigns.live_action, params)}
+  end
+
+  defp return_to("show"), do: "show"
+  defp return_to(_), do: "index"
+
+  defp apply_action(socket, :edit, %{"id" => id}) do
+    endgame = Endgames.get_endgame!(id)
+
+    socket
+    |> assign(:page_title, "Edit Endgame")
+    |> assign(:endgame, endgame)
+    |> assign(:tag_query, "")
+    |> assign(:tag_results, [])
+    |> assign(:endgame, Repo.preload(endgame, :tags))
+    |> assign(:form, to_form(Endgames.change_endgame(endgame)))
+  end
+
+  defp apply_action(socket, :new, _params) do
+    endgame = %Endgame{}
+
+    socket
+    |> assign(:page_title, "New Endgame")
+    |> assign(:endgame, endgame)
+    |> assign(:tag_query, "")
+    |> assign(:tag_results, [])
+    |> assign(:endgame, Repo.preload(endgame, :tags))
+    |> assign(:form, to_form(Endgames.change_endgame(endgame)))
+  end
+
+  @impl true
+  def handle_event("search_tags", %{"tag_search" => query}, socket) do
+    tags = Tags.search(query, "endgame")
+
+    {:noreply,
+     socket
+     |> assign(:tag_query, query)
+     |> assign(:tag_results, tags)}
+  end
+
+  def handle_event("add_tag", %{"id" => id}, socket) do
+    tag = Tags.get_tag!(id)
+    {:ok, endgame} = Endgames.add_tag(socket.assigns.endgame, tag)
+
+    {:noreply,
+     socket
+     |> assign(:endgame, Repo.preload(endgame, :tags))
+     |> assign(:tag_query, "")
+     |> assign(:tag_results, [])}
+  end
+
+  def handle_event("create_tag", %{"name" => name}, socket) do
+    {:ok, tag} = Tags.get_or_create(name, "endgame")
+    {:ok, endgame} = Endgames.add_tag(socket.assigns.endgame, tag)
+
+    {:noreply,
+     socket
+     |> assign(:endgame, Repo.preload(endgame, :tags))
+     |> assign(:tag_query, "")
+     |> assign(:tag_results, [])}
+  end
+
+  def handle_event("remove_tag", %{"id" => id}, socket) do
+    tag = Tags.get_tag!(id)
+    {:ok, endgame} = Endgames.remove_tag(socket.assigns.endgame, tag)
+
+    {:noreply,
+     socket
+     |> assign(:endgame, Repo.preload(endgame, :tags))}
+  end
+
+  def handle_event("validate", %{"endgame" => endgame_params}, socket) do
+    # Compute color from the incoming FEN
+    color = FEN.color_from_fen(endgame_params["fen"])
+
+    # Update the struct
+    endgame = %{socket.assigns.endgame | color: color}
+
+    # Build the changeset *from the updated struct*
+    changeset =
+      endgame
+      |> Endgames.change_endgame()
+      |> Ecto.Changeset.put_change(:color, color)
+
+    {:noreply, assign(socket, endgame: endgame, form: to_form(changeset, action: :validate))}
+  end
+
+  def handle_event("save", %{"endgame" => endgame_params}, socket) do
+    save_endgame(socket, socket.assigns.live_action, endgame_params)
+  end
+
+  defp save_endgame(socket, :edit, endgame_params) do
+    case Endgames.update_endgame(socket.assigns.endgame, endgame_params) do
+      {:ok, endgame} ->
+        {:noreply,
+         socket
+         |> put_flash(:info, "Endgame updated successfully")
+         |> push_navigate(to: return_path(socket.assigns.return_to, endgame))}
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        {:noreply, assign(socket, form: to_form(changeset))}
+    end
+  end
+
+  defp save_endgame(socket, :new, endgame_params) do
+    color = FEN.color_from_fen(endgame_params["fen"])
+    params = Map.put(endgame_params, "color", color)
+
+    case Endgames.create_endgame(params) do
+      {:ok, endgame} ->
+        {:noreply,
+         socket
+         |> put_flash(:info, "Endgame created successfully")
+         |> push_navigate(to: return_path(socket.assigns.return_to, endgame))}
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        {:noreply, assign(socket, form: to_form(changeset))}
+    end
+  end
+
+  defp return_path("index", _endgame), do: ~p"/admin/endgames"
+  defp return_path("show", endgame), do: ~p"/admin/endgames/#{endgame}"
+end

lib/chesstrainer_web/live/endgame_live/index.ex

@@ -0,0 +1,71 @@
+defmodule ChesstrainerWeb.EndgameLive.Index do
+  use ChesstrainerWeb, :live_view
+
+  alias Chesstrainer.Endgames
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <Layouts.app flash={@flash}>
+      <.header>
+        Listing Endgames
+        <:actions>
+          <.button variant="primary" navigate={~p"/admin/endgames/new"}>
+            <.icon name="hero-plus" /> New Endgame
+          </.button>
+        </:actions>
+      </.header>
+
+      <.table
+        id="endgames"
+        rows={@streams.endgames}
+        row_click={fn {_id, endgame} -> JS.navigate(~p"/admin/endgames/#{endgame}") end}
+      >
+        <:col :let={{_id, endgame}} label="Fen">{endgame.fen}</:col>
+        <:col :let={{_id, endgame}} label="Color">{endgame.color}</:col>
+        <:col :let={{_id, endgame}} label="Key">{endgame.key}</:col>
+        <:col :let={{_id, endgame}} label="Rating">{endgame.rating}</:col>
+        <:col :let={{_id, endgame}} label="Message">{endgame.message}</:col>
+        <:col :let={{_id, endgame}} label="Notes">{endgame.notes}</:col>
+        <:col :let={{_id, endgame}} label="Result">{endgame.result}</:col>
+        <:col :let={{_id, endgame}} label="Attempted">{endgame.times_attempted}</:col>
+        <:col :let={{_id, endgame}} label="Solved">{endgame.times_solved}</:col>
+        <:action :let={{_id, endgame}}>
+          <div class="sr-only">
+            <.link navigate={~p"/admin/endgames/#{endgame}"}>Show</.link>
+          </div>
+          <.link navigate={~p"/admin/endgames/#{endgame}/edit"}>Edit</.link>
+        </:action>
+        <:action :let={{id, endgame}}>
+          <.link
+            phx-click={JS.push("delete", value: %{id: endgame.id}) |> hide("##{id}")}
+            data-confirm="Are you sure?"
+          >
+            Delete
+          </.link>
+        </:action>
+      </.table>
+    </Layouts.app>
+    """
+  end
+
+  @impl true
+  def mount(_params, _session, socket) do
+    {:ok,
+     socket
+     |> assign(:page_title, "Listing Endgames")
+     |> stream(:endgames, list_endgames())}
+  end
+
+  @impl true
+  def handle_event("delete", %{"id" => id}, socket) do
+    endgame = Endgames.get_endgame!(id)
+    {:ok, _} = Endgames.delete_endgame(endgame)
+
+    {:noreply, stream_delete(socket, :endgames, endgame)}
+  end
+
+  defp list_endgames() do
+    Endgames.list_endgames()
+  end
+end

lib/chesstrainer_web/live/endgame_live/show.ex

@@ -0,0 +1,64 @@
+defmodule ChesstrainerWeb.EndgameLive.Show do
+  use ChesstrainerWeb, :live_view
+
+  alias Chesstrainer.Endgames
+  alias Chesstrainer.Game
+
+  import ChesstrainerWeb.Board.BoardComponent
+
+  @impl true
+  def render(assigns) do
+    game =
+      case Game.game_from_fen(assigns.endgame.fen, :endgame) do
+        {:ok, g} -> g
+        {:error, :invalid_fen, g} -> g
+      end
+
+    # TODO once we return {:error, :invalid_fen, game}, then put flash to show it is invalid
+    # write tests for this
+
+    assigns =
+      assigns
+      |> assign(:game, game)
+      |> assign(:game_type, :endgame)
+
+    ~H"""
+    <Layouts.app flash={@flash}>
+      <.header>
+        Endgame {@endgame.id}
+        <:subtitle>This is a endgame record from your database.</:subtitle>
+        <:actions>
+          <.button navigate={~p"/admin/endgames"}>
+            <.icon name="hero-arrow-left" />
+          </.button>
+          <.button variant="primary" navigate={~p"/admin/endgames/#{@endgame}/edit?return_to=show"}>
+            <.icon name="hero-pencil-square" /> Edit endgame
+          </.button>
+        </:actions>
+      </.header>
+
+      <.board game={@game} myself="board" />
+
+      <.list>
+        <:item title="Fen">{@endgame.fen}</:item>
+        <:item title="Key">{@endgame.key}</:item>
+        <:item title="Color">{@endgame.color}</:item>
+        <:item title="Rating">{@endgame.rating}</:item>
+        <:item title="Message">{@endgame.message}</:item>
+        <:item title="Notes">{@endgame.notes}</:item>
+        <:item title="Result">{@endgame.result}</:item>
+        <:item title="Attempted">{@endgame.times_attempted}</:item>
+        <:item title="Solved">{@endgame.times_solved}</:item>
+      </.list>
+    </Layouts.app>
+    """
+  end
+
+  @impl true
+  def mount(%{"id" => id}, _session, socket) do
+    {:ok,
+     socket
+     |> assign(:page_title, "Show Endgame")
+     |> assign(:endgame, Endgames.get_endgame!(id))}
+  end
+end

lib/chesstrainer_web/router.ex

@@ -22,6 +22,17 @@ defmodule ChesstrainerWeb.Router do
     live "/chess-test", ChessTestLive
   end
 
+  scope "/admin", ChesstrainerWeb do
+    pipe_through :browser
+
+    live_session :endgames do
+      live "/endgames", EndgameLive.Index, :index
+      live "/endgames/new", EndgameLive.Form, :new
+      live "/endgames/:id", EndgameLive.Show, :show
+      live "/endgames/:id/edit", EndgameLive.Form, :edit
+    end
+  end
+
   # Other scopes may use custom stacks.
   # scope "/api", ChesstrainerWeb do
   #   pipe_through :api

mix.exs

@@ -65,7 +65,8 @@ defmodule Chesstrainer.MixProject do
       {:gettext, "~> 1.0"},
       {:jason, "~> 1.2"},
       {:dns_cluster, "~> 0.2.0"},
-      {:bandit, "~> 1.5"}
+      {:bandit, "~> 1.5"},
+      {:chex, git: "https://github.com/therealowenrees/chex.git", tag: "v0.2.0-alpha.2"}
     ]
   end
 

mix.lock

@@ -1,6 +1,7 @@
 %{
   "bandit": {:hex, :bandit, "1.12.0", "6c5214daa2469644ac4ab0113b98abc24f75e348378e6a974c6343b3e5da22ef", [:mix], [{:hpax, "~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}, {:plug, "~> 1.18", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:thousand_island, "~> 1.5", [hex: :thousand_island, repo: "hexpm", optional: false]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "45dac82dc86f45cf4a196dee9cc5a8b791d9c9469d996055f055e6ee36c66e20"},
   "cc_precompiler": {:hex, :cc_precompiler, "0.1.11", "8c844d0b9fb98a3edea067f94f616b3f6b29b959b6b3bf25fee94ffe34364768", [:mix], [{:elixir_make, "~> 0.7", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "3427232caf0835f94680e5bcf082408a70b48ad68a5f5c0b02a3bea9f3a075b9"},
+  "chex": {:git, "https://github.com/therealowenrees/chex.git", "655b5c3df6c5297689d7872bbce1e86c6c629d26", [tag: "v0.2.0-alpha.2"]},
   "db_connection": {:hex, :db_connection, "2.10.1", "d5465f6bcc125c1b8981c1dbf23c193ca16f446ec0b25832dc174f74f18be510", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "18ed94c6e627b4bf452dbd4df61b69a35a1e768525140bc1917b7a685026a6a3"},
   "decimal": {:hex, :decimal, "3.1.1", "430d87b04011ce6cbd4fd205be758311a81f87d552d40904abd00f015935b1d0", [:mix], [], "hexpm", "c5f25f2ced74a0587d03e6023f595db8e924c9d3922c8c8ffd9edfc4498cf1f6"},
   "dns_cluster": {:hex, :dns_cluster, "0.2.0", "aa8eb46e3bd0326bd67b84790c561733b25c5ba2fe3c7e36f28e88f384ebcb33", [:mix], [], "hexpm", "ba6f1893411c69c01b9e8e8f772062535a4cf70f3f35bcc964a324078d8c8240"},
@@ -21,6 +22,7 @@
   "mime": {:hex, :mime, "2.0.7", "b8d739037be7cd402aee1ba0306edfdef982687ee7e9859bee6198c1e7e2f128", [:mix], [], "hexpm", "6171188e399ee16023ffc5b76ce445eb6d9672e2e241d2df6050f3c771e80ccd"},
   "mint": {:hex, :mint, "1.9.0", "d6f534c2a3e98b2a8cc749b4796eb77e9e3af79a76f96e4c74035a827de0d318", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "007154c7d8c43916aed3c93afd1f11aebbaa9c5ff4b7ba55ebe0d17ee0296042"},
   "nimble_options": {:hex, :nimble_options, "1.1.1", "e3a492d54d85fc3fd7c5baf411d9d2852922f66e69476317787a7b2bb000a61b", [:mix], [], "hexpm", "821b2470ca9442c4b6984882fe9bb0389371b8ddec4d45a9504f00a66f650b44"},
+  "nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
   "nimble_pool": {:hex, :nimble_pool, "1.1.0", "bf9c29fbdcba3564a8b800d1eeb5a3c58f36e1e11d7b7fb2e084a643f645f06b", [:mix], [], "hexpm", "af2e4e6b34197db81f7aad230c1118eac993acc0dae6bc83bac0126d4ae0813a"},
   "phoenix": {:hex, :phoenix, "1.8.8", "ada3d761359274178180c0e992ef0c2b536bd7c3bd75ebba94acbf39ab4347fe", [:mix], [{:bandit, "~> 1.0", [hex: :bandit, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.1", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:phoenix_template, "~> 1.0", [hex: :phoenix_template, repo: "hexpm", optional: false]}, {:phoenix_view, "~> 2.0", [hex: :phoenix_view, repo: "hexpm", optional: true]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.7", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:websock_adapter, "~> 0.5.3", [hex: :websock_adapter, repo: "hexpm", optional: false]}], "hexpm", "f0c843037bd2e7012fc1d1ec9574dfa6972b7e3d09e9b77fd23aa283af0aa994"},
   "phoenix_ecto": {:hex, :phoenix_ecto, "4.7.0", "75c4b9dfb3efdc42aec2bd5f8bccd978aca0651dbcbc7a3f362ea5d9d43153c6", [:mix], [{:ecto, "~> 3.5", [hex: :ecto, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.14.2 or ~> 3.0 or ~> 4.1", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: false]}, {:postgrex, "~> 0.16 or ~> 1.0", [hex: :postgrex, repo: "hexpm", optional: true]}], "hexpm", "1d75011e4254cb4ddf823e81823a9629559a1be93b4321a6a5f11a5306fbf4cc"},

priv/repo/migrations/20251105204020_create_tags.exs

@@ -0,0 +1,14 @@
+defmodule Chesstrainer.Repo.Migrations.CreateTags do
+  use Ecto.Migration
+
+  def change do
+    create table(:tags) do
+      add :name, :string
+      add :category, :string
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create unique_index(:tags, [:name, :category])
+  end
+end

priv/repo/migrations/20251127164545_create_endgames.exs

@@ -0,0 +1,23 @@
+defmodule Chesstrainer.Repo.Migrations.CreateEndgames do
+  use Ecto.Migration
+
+  def change do
+    create table(:endgames, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :fen, :string
+      add :color, :string
+      add :key, :string
+      add :message, :text
+      add :notes, :text
+      add :result, :string
+      add :rating, :integer, default: 1500
+      add :rating_deviation, :integer, default: 350
+      add :times_attempted, :integer, default: 0
+      add :times_solved, :integer, default: 0
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create unique_index(:endgames, [:fen])
+  end
+end

priv/repo/migrations/20251205210539_create_endgames_tags.exs

@@ -0,0 +1,12 @@
+defmodule Chesstrainer.Repo.Migrations.CreateEndgamesTags do
+  use Ecto.Migration
+
+  def change do
+    create table(:endgames_tags, primary_key: false) do
+      add :endgame_id, references(:endgames, type: :binary_id, on_delete: :delete_all)
+      add :tag_id, references(:tags, on_delete: :delete_all)
+    end
+
+    create unique_index(:endgames_tags, [:endgame_id, :tag_id])
+  end
+end

priv/repo/seeds.exs

@@ -9,3 +9,57 @@
 #
 # We recommend using the bang functions (`insert!`, `update!`
 # and so on) as they will fail if something goes wrong.
+
+alias Chesstrainer.Repo
+alias Chesstrainer.Endgames.Endgame
+alias Chesstrainer.Tags.Tag
+
+now = DateTime.utc_now() |> DateTime.truncate(:second)
+
+IO.puts("🌱 Seeding basic endgames into DB...")
+
+Repo.insert_all(Endgame, [
+  %{
+    id: Ecto.UUID.generate(),
+    fen: "8/8/3k4/8/8/3K1R2/8/8 w - - 0 1",
+    color: :white,
+    key: "KR v K",
+    message: "Rook vs king endgame",
+    notes: "Basic rook endgame",
+    result: :win,
+    inserted_at: now,
+    updated_at: now
+  },
+  %{
+    id: Ecto.UUID.generate(),
+    fen: "6k1/5p2/6p1/8/7p/8/6PP/6K1 b - - 0 0",
+    color: :black,
+    key: "KPPP v KPP",
+    message: "3 pawns vs 2 pawns",
+    notes: "https://www.chessgames.com/perl/chessgame?gid=1017147",
+    result: :win,
+    inserted_at: now,
+    updated_at: now
+  }
+])
+
+IO.puts("✅ Done seeding endgames.")
+
+IO.puts("🌱 Seeding endgame tags into DB...")
+
+Repo.insert_all(Tag, [
+  %{
+    name: "mate in 2",
+    category: :endgame,
+    inserted_at: now,
+    updated_at: now
+  },
+  %{
+    name: "mate in 3",
+    category: :endgame,
+    inserted_at: now,
+    updated_at: now
+  }
+])
+
+IO.puts("✅ Done seeding endgame tags.")

priv/static/images/pieces/black/bishop-cb69fc1a80edd0241466c0d47b116db2.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="opacity:1; fill:none; fill-rule:evenodd; fill-opacity:1; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0.6)">
+    <g style="fill:#000000; stroke:#000000; stroke-linecap:butt;">
+      <path d="M 9,36 C 12.39,35.03 19.11,36.43 22.5,34 C 25.89,36.43 32.61,35.03 36,36 C 36,36 37.65,36.54 39,38 C 38.32,38.97 37.35,38.99 36,38.5 C 32.61,37.53 25.89,38.96 22.5,37.5 C 19.11,38.96 12.39,37.53 9,38.5 C 7.65,38.99 6.68,38.97 6,38 C 7.35,36.54 9,36 9,36 z"/>
+      <path d="M 15,32 C 17.5,34.5 27.5,34.5 30,32 C 30.5,30.5 30,30 30,30 C 30,27.5 27.5,26 27.5,26 C 33,24.5 33.5,14.5 22.5,10.5 C 11.5,14.5 12,24.5 17.5,26 C 17.5,26 15,27.5 15,30 C 15,30 14.5,30.5 15,32 z"/>
+      <path d="M 25 8 A 2.5 2.5 0 1 1  20,8 A 2.5 2.5 0 1 1  25 8 z"/>
+    </g>
+    <path d="M 17.5,26 L 27.5,26 M 15,30 L 30,30 M 22.5,15.5 L 22.5,20.5 M 20,18 L 25,18" style="fill:none; stroke:#ffffff; stroke-linejoin:miter;"/>
+  </g>
+</svg>

priv/static/images/pieces/black/bishop.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="opacity:1; fill:none; fill-rule:evenodd; fill-opacity:1; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0.6)">
+    <g style="fill:#000000; stroke:#000000; stroke-linecap:butt;">
+      <path d="M 9,36 C 12.39,35.03 19.11,36.43 22.5,34 C 25.89,36.43 32.61,35.03 36,36 C 36,36 37.65,36.54 39,38 C 38.32,38.97 37.35,38.99 36,38.5 C 32.61,37.53 25.89,38.96 22.5,37.5 C 19.11,38.96 12.39,37.53 9,38.5 C 7.65,38.99 6.68,38.97 6,38 C 7.35,36.54 9,36 9,36 z"/>
+      <path d="M 15,32 C 17.5,34.5 27.5,34.5 30,32 C 30.5,30.5 30,30 30,30 C 30,27.5 27.5,26 27.5,26 C 33,24.5 33.5,14.5 22.5,10.5 C 11.5,14.5 12,24.5 17.5,26 C 17.5,26 15,27.5 15,30 C 15,30 14.5,30.5 15,32 z"/>
+      <path d="M 25 8 A 2.5 2.5 0 1 1  20,8 A 2.5 2.5 0 1 1  25 8 z"/>
+    </g>
+    <path d="M 17.5,26 L 27.5,26 M 15,30 L 30,30 M 22.5,15.5 L 22.5,20.5 M 20,18 L 25,18" style="fill:none; stroke:#ffffff; stroke-linejoin:miter;"/>
+  </g>
+</svg>

priv/static/images/pieces/black/king-e3451fff6ecf0fcd6de9217ccec6ba84.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;">
+    <path d="M 22.5,11.63 L 22.5,6" style="fill:none; stroke:#000000; stroke-linejoin:miter;" id="path6570"/>
+    <path d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25" style="fill:#000000;fill-opacity:1; stroke-linecap:butt; stroke-linejoin:miter;"/>
+    <path d="M 12.5,37 C 18,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 20,16 10.5,13 6.5,19.5 C 3.5,25.5 12.5,30 12.5,30 L 12.5,37" style="fill:#000000; stroke:#000000;"/>
+    <path d="M 20,8 L 25,8" style="fill:none; stroke:#000000; stroke-linejoin:miter;"/>
+    <path d="M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.5,26.6 L 22.5,24.5 C 20,18 10.85,14 6.97,19.85 C 4.5,25.5 13,29.5 13,29.5" style="fill:none; stroke:#ffffff;"/>
+    <path d="M 12.5,30 C 18,27 27,27 32.5,30 M 12.5,33.5 C 18,30.5 27,30.5 32.5,33.5 M 12.5,37 C 18,34 27,34 32.5,37" style="fill:none; stroke:#ffffff;"/>
+  </g>
+</svg>

priv/static/images/pieces/black/king.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;">
+    <path d="M 22.5,11.63 L 22.5,6" style="fill:none; stroke:#000000; stroke-linejoin:miter;" id="path6570"/>
+    <path d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25" style="fill:#000000;fill-opacity:1; stroke-linecap:butt; stroke-linejoin:miter;"/>
+    <path d="M 12.5,37 C 18,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 20,16 10.5,13 6.5,19.5 C 3.5,25.5 12.5,30 12.5,30 L 12.5,37" style="fill:#000000; stroke:#000000;"/>
+    <path d="M 20,8 L 25,8" style="fill:none; stroke:#000000; stroke-linejoin:miter;"/>
+    <path d="M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.5,26.6 L 22.5,24.5 C 20,18 10.85,14 6.97,19.85 C 4.5,25.5 13,29.5 13,29.5" style="fill:none; stroke:#ffffff;"/>
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priv/static/images/pieces/black/knight.svg

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priv/static/images/pieces/black/pawn.svg

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priv/static/images/pieces/black/queen-8e8aadb6f4a4229d3cb0650301f5a9fd.svg

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priv/static/images/pieces/black/queen.svg

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priv/static/images/pieces/black/rook-9a79237a3c4acee7893525f1bfc456ca.svg

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priv/static/images/pieces/black/rook.svg

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priv/static/images/pieces/white/bishop-b99f3830dcbf60642c26befe1514ebbc.svg

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priv/static/images/pieces/white/bishop.svg

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priv/static/images/pieces/white/king-27fd3307056d10dae685faf4ca8f4488.svg

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priv/static/images/pieces/white/king.svg

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+    <path fill="#fff" d="M12.5 37c5.5 3.5 14.5 3.5 20 0v-7s9-4.5 6-10.5c-4-6.5-13.5-3.5-16 4V27v-3.5c-2.5-7.5-12-10.5-16-4-3 6 6 10.5 6 10.5v7"/>
+    <path d="M12.5 30c5.5-3 14.5-3 20 0m-20 3.5c5.5-3 14.5-3 20 0m-20 3.5c5.5-3 14.5-3 20 0"/>
+  </g>
+</svg>

priv/static/images/pieces/white/knight-b243da7dc2f0791b4b6915ed2091b288.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="opacity:1; fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0.3)">
+    <path
+      d="M 22,10 C 32.5,11 38.5,18 38,39 L 15,39 C 15,30 25,32.5 23,18"
+      style="fill:#ffffff; stroke:#000000;" />
+    <path
+      d="M 24,18 C 24.38,20.91 18.45,25.37 16,27 C 13,29 13.18,31.34 11,31 C 9.958,30.06 12.41,27.96 11,28 C 10,28 11.19,29.23 10,30 C 9,30 5.997,31 6,26 C 6,24 12,14 12,14 C 12,14 13.89,12.1 14,10.5 C 13.27,9.506 13.5,8.5 13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10"
+      style="fill:#ffffff; stroke:#000000;" />
+    <path
+      d="M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z"
+      style="fill:#000000; stroke:#000000;" />
+    <path
+      d="M 15 15.5 A 0.5 1.5 0 1 1  14,15.5 A 0.5 1.5 0 1 1  15 15.5 z"
+      transform="matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)"
+      style="fill:#000000; stroke:#000000;" />
+  </g>
+</svg>

priv/static/images/pieces/white/knight.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="opacity:1; fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0.3)">
+    <path
+      d="M 22,10 C 32.5,11 38.5,18 38,39 L 15,39 C 15,30 25,32.5 23,18"
+      style="fill:#ffffff; stroke:#000000;" />
+    <path
+      d="M 24,18 C 24.38,20.91 18.45,25.37 16,27 C 13,29 13.18,31.34 11,31 C 9.958,30.06 12.41,27.96 11,28 C 10,28 11.19,29.23 10,30 C 9,30 5.997,31 6,26 C 6,24 12,14 12,14 C 12,14 13.89,12.1 14,10.5 C 13.27,9.506 13.5,8.5 13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10"
+      style="fill:#ffffff; stroke:#000000;" />
+    <path
+      d="M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z"
+      style="fill:#000000; stroke:#000000;" />
+    <path
+      d="M 15 15.5 A 0.5 1.5 0 1 1  14,15.5 A 0.5 1.5 0 1 1  15 15.5 z"
+      transform="matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)"
+      style="fill:#000000; stroke:#000000;" />
+  </g>
+</svg>

priv/static/images/pieces/white/pawn-e38a4f66149924b57e4617dbbfe10ef7.svg

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <path d="m 22.5,9 c -2.21,0 -4,1.79 -4,4 0,0.89 0.29,1.71 0.78,2.38 C 17.33,16.5 16,18.59 16,21 c 0,2.03 0.94,3.84 2.41,5.03 C 15.41,27.09 11,31.58 11,39.5 H 34 C 34,31.58 29.59,27.09 26.59,26.03 28.06,24.84 29,23.03 29,21 29,18.59 27.67,16.5 25.72,15.38 26.21,14.71 26.5,13.89 26.5,13 c 0,-2.21 -1.79,-4 -4,-4 z" style="opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:nonzero; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:miter; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;"/>
+</svg>

priv/static/images/pieces/white/pawn.svg

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <path d="m 22.5,9 c -2.21,0 -4,1.79 -4,4 0,0.89 0.29,1.71 0.78,2.38 C 17.33,16.5 16,18.59 16,21 c 0,2.03 0.94,3.84 2.41,5.03 C 15.41,27.09 11,31.58 11,39.5 H 34 C 34,31.58 29.59,27.09 26.59,26.03 28.06,24.84 29,23.03 29,21 29,18.59 27.67,16.5 25.72,15.38 26.21,14.71 26.5,13.89 26.5,13 c 0,-2.21 -1.79,-4 -4,-4 z" style="opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:nonzero; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:miter; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;"/>
+</svg>

priv/static/images/pieces/white/queen-518cd5f8585dbdb35199fa1edf31979f.svg

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="fill:#ffffff;stroke:#000000;stroke-width:1.5;stroke-linejoin:round">
+    <path d="M 9,26 C 17.5,24.5 30,24.5 36,26 L 38.5,13.5 L 31,25 L 30.7,10.9 L 25.5,24.5 L 22.5,10 L 19.5,24.5 L 14.3,10.9 L 14,25 L 6.5,13.5 L 9,26 z"/>
+    <path d="M 9,26 C 9,28 10.5,28 11.5,30 C 12.5,31.5 12.5,31 12,33.5 C 10.5,34.5 11,36 11,36 C 9.5,37.5 11,38.5 11,38.5 C 17.5,39.5 27.5,39.5 34,38.5 C 34,38.5 35.5,37.5 34,36 C 34,36 34.5,34.5 33,33.5 C 32.5,31 32.5,31.5 33.5,30 C 34.5,28 36,28 36,26 C 27.5,24.5 17.5,24.5 9,26 z"/>
+    <path d="M 11.5,30 C 15,29 30,29 33.5,30" style="fill:none"/>
+    <path d="M 12,33.5 C 18,32.5 27,32.5 33,33.5" style="fill:none"/>
+    <circle cx="6" cy="12" r="2" />
+    <circle cx="14" cy="9" r="2" />
+    <circle cx="22.5" cy="8" r="2" />
+    <circle cx="31" cy="9" r="2" />
+    <circle cx="39" cy="12" r="2" />
+  </g>
+</svg>

priv/static/images/pieces/white/queen.svg

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="fill:#ffffff;stroke:#000000;stroke-width:1.5;stroke-linejoin:round">
+    <path d="M 9,26 C 17.5,24.5 30,24.5 36,26 L 38.5,13.5 L 31,25 L 30.7,10.9 L 25.5,24.5 L 22.5,10 L 19.5,24.5 L 14.3,10.9 L 14,25 L 6.5,13.5 L 9,26 z"/>
+    <path d="M 9,26 C 9,28 10.5,28 11.5,30 C 12.5,31.5 12.5,31 12,33.5 C 10.5,34.5 11,36 11,36 C 9.5,37.5 11,38.5 11,38.5 C 17.5,39.5 27.5,39.5 34,38.5 C 34,38.5 35.5,37.5 34,36 C 34,36 34.5,34.5 33,33.5 C 32.5,31 32.5,31.5 33.5,30 C 34.5,28 36,28 36,26 C 27.5,24.5 17.5,24.5 9,26 z"/>
+    <path d="M 11.5,30 C 15,29 30,29 33.5,30" style="fill:none"/>
+    <path d="M 12,33.5 C 18,32.5 27,32.5 33,33.5" style="fill:none"/>
+    <circle cx="6" cy="12" r="2" />
+    <circle cx="14" cy="9" r="2" />
+    <circle cx="22.5" cy="8" r="2" />
+    <circle cx="31" cy="9" r="2" />
+    <circle cx="39" cy="12" r="2" />
+  </g>
+</svg>

priv/static/images/pieces/white/rook-0095917f84de3487e19f9d8d46876859.svg

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0.3)">
+    <path
+      d="M 9,39 L 36,39 L 36,36 L 9,36 L 9,39 z "
+      style="stroke-linecap:butt;" />
+    <path
+      d="M 12,36 L 12,32 L 33,32 L 33,36 L 12,36 z "
+      style="stroke-linecap:butt;" />
+    <path
+      d="M 11,14 L 11,9 L 15,9 L 15,11 L 20,11 L 20,9 L 25,9 L 25,11 L 30,11 L 30,9 L 34,9 L 34,14"
+      style="stroke-linecap:butt;" />
+    <path
+      d="M 34,14 L 31,17 L 14,17 L 11,14" />
+    <path
+      d="M 31,17 L 31,29.5 L 14,29.5 L 14,17"
+      style="stroke-linecap:butt; stroke-linejoin:miter;" />
+    <path
+      d="M 31,29.5 L 32.5,32 L 12.5,32 L 14,29.5" />
+    <path
+      d="M 11,14 L 34,14"
+      style="fill:none; stroke:#000000; stroke-linejoin:miter;" />
+  </g>
+</svg>

priv/static/images/pieces/white/rook.svg

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+  <g style="opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0.3)">
+    <path
+      d="M 9,39 L 36,39 L 36,36 L 9,36 L 9,39 z "
+      style="stroke-linecap:butt;" />
+    <path
+      d="M 12,36 L 12,32 L 33,32 L 33,36 L 12,36 z "
+      style="stroke-linecap:butt;" />
+    <path
+      d="M 11,14 L 11,9 L 15,9 L 15,11 L 20,11 L 20,9 L 25,9 L 25,11 L 30,11 L 30,9 L 34,9 L 34,14"
+      style="stroke-linecap:butt;" />
+    <path
+      d="M 34,14 L 31,17 L 14,17 L 11,14" />
+    <path
+      d="M 31,17 L 31,29.5 L 14,29.5 L 14,17"
+      style="stroke-linecap:butt; stroke-linejoin:miter;" />
+    <path
+      d="M 31,29.5 L 32.5,32 L 12.5,32 L 14,29.5" />
+    <path
+      d="M 11,14 L 34,14"
+      style="fill:none; stroke:#000000; stroke-linejoin:miter;" />
+  </g>
+</svg>

test/chesstrainer/tags_test.exs

@@ -0,0 +1,61 @@
+defmodule Chesstrainer.TagsTest do
+  use Chesstrainer.DataCase
+
+  alias Chesstrainer.Tags
+
+  describe "tags" do
+    alias Chesstrainer.Tags.Tag
+
+    import Chesstrainer.TagsFixtures
+
+    @invalid_attrs %{name: nil, category: nil}
+
+    test "list_tags/0 returns all tags" do
+      tag = tag_fixture()
+      assert Tags.list_tags() == [tag]
+    end
+
+    test "get_tag!/1 returns the tag with given id" do
+      tag = tag_fixture()
+      assert Tags.get_tag!(tag.id) == tag
+    end
+
+    test "create_tag/1 with valid data creates a tag" do
+      valid_attrs = %{name: "some name", category: "some category"}
+
+      assert {:ok, %Tag{} = tag} = Tags.create_tag(valid_attrs)
+      assert tag.name == "some name"
+      assert tag.category == "some category"
+    end
+
+    test "create_tag/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Tags.create_tag(@invalid_attrs)
+    end
+
+    test "update_tag/2 with valid data updates the tag" do
+      tag = tag_fixture()
+      update_attrs = %{name: "some updated name", category: "some updated category"}
+
+      assert {:ok, %Tag{} = tag} = Tags.update_tag(tag, update_attrs)
+      assert tag.name == "some updated name"
+      assert tag.category == "some updated category"
+    end
+
+    test "update_tag/2 with invalid data returns error changeset" do
+      tag = tag_fixture()
+      assert {:error, %Ecto.Changeset{}} = Tags.update_tag(tag, @invalid_attrs)
+      assert tag == Tags.get_tag!(tag.id)
+    end
+
+    test "delete_tag/1 deletes the tag" do
+      tag = tag_fixture()
+      assert {:ok, %Tag{}} = Tags.delete_tag(tag)
+      assert_raise Ecto.NoResultsError, fn -> Tags.get_tag!(tag.id) end
+    end
+
+    test "change_tag/1 returns a tag changeset" do
+      tag = tag_fixture()
+      assert %Ecto.Changeset{} = Tags.change_tag(tag)
+    end
+  end
+end

test/chesstrainer_web/controllers/error_html_test.exs

@@ -9,6 +9,7 @@ defmodule ChesstrainerWeb.ErrorHTMLTest do
   end
 
   test "renders 500.html" do
-    assert render_to_string(ChesstrainerWeb.ErrorHTML, "500", "html", []) == "Internal Server Error"
+    assert render_to_string(ChesstrainerWeb.ErrorHTML, "500", "html", []) ==
+             "Internal Server Error"
   end
 end

test/support/fixtures/tags_fixtures.ex

@@ -0,0 +1,26 @@
+defmodule Chesstrainer.TagsFixtures do
+  @moduledoc """
+  This module defines test helpers for creating
+  entities via the `Chesstrainer.Tags` context.
+  """
+
+  @doc """
+  Generate a unique tag name.
+  """
+  def unique_tag_name, do: "some name#{System.unique_integer([:positive])}"
+
+  @doc """
+  Generate a tag.
+  """
+  def tag_fixture(attrs \\ %{}) do
+    {:ok, tag} =
+      attrs
+      |> Enum.into(%{
+        category: "some category",
+        name: unique_tag_name()
+      })
+      |> Chesstrainer.Tags.create_tag()
+
+    tag
+  end
+end