Persist manual ELO form to local storage

Persist manual ELO form to local storage

src/app/[locale]/elo/ManualEloForm.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { zodResolver } from "@hookform/resolvers/zod";
-import { last } from "lodash";
+import { isEmpty, isNil, last } from "lodash";
 import { useTranslations } from "next-intl";
 import { FormProvider, useFieldArray, useForm } from "react-hook-form";
 import { IoAdd, IoCloseOutline } from "react-icons/io5";
@@ -11,12 +11,13 @@ import { z } from "zod";
 import { RadioGroupField } from "@/components/form/RadioGroupField";
 import { SelectField } from "@/components/form/SelectField";
 import { TextField } from "@/components/form/TextField";
+import useFormPersist from "@/hooks/useFormPersist";
 import { getNewRating } from "@/utils/eloCalculator";
 
 import { KFactor } from "./KFactor";
 
 const resultsSchema = z.object({
-  currentElo: z.number().int().positive(),
+  currentElo: z.number().int().positive().nullish(),
   kFactor: z.enum(["40", "30", "20", "15", "10"]),
   games: z.array(
     z.object({
@@ -40,6 +41,7 @@ export const ManualEloForm = () => {
   const form = useForm<EloFormValues>({
     resolver: zodResolver(resultsSchema),
     defaultValues: {
+      currentElo: null,
       kFactor: "20",
       games: [{}],
     },
@@ -54,6 +56,12 @@ export const ManualEloForm = () => {
     name: "games",
   });
 
+  useFormPersist("manualElo", {
+    watch: form.watch,
+    setValue: form.setValue,
+    storage: window.localStorage,
+  });
+
   const onSubmit = async (data: EloFormValues) => {};
 
   const [currentElo, kFactor, games] = form.watch([
@@ -62,6 +70,13 @@ export const ManualEloForm = () => {
     "games",
   ]);
 
+  const isDefault =
+    isEmpty(currentElo) &&
+    kFactor === "20" &&
+    games?.length === 1 &&
+    (isEmpty(games[0]) ||
+      (isEmpty(games[0]?.opponentElo) && isEmpty(games[0]?.result)));
+
   type Deltas = {
     rating: number;
     deltas: { rating: number; delta: number | undefined }[];
@@ -70,7 +85,11 @@ export const ManualEloForm = () => {
   const calculations = !Number.isNaN(currentElo)
     ? (games ?? []).reduce<Deltas>(
         (acc, game) => {
-          if (!Number.isNaN(game?.opponentElo) && game?.result) {
+          if (
+            !isNil(game?.opponentElo) &&
+            !Number.isNaN(game?.opponentElo) &&
+            game?.result
+          ) {
             const result =
               game?.result === "win" ? 1 : game?.result === "loss" ? 0 : 0.5;
 
@@ -136,8 +155,8 @@ export const ManualEloForm = () => {
         <div className="flex w-full flex-col gap-6 sm:gap-2">
           {gameFields.map((game, i) => {
             return (
-              <div key={i} className="flex w-full flex-col">
-                <div key={i} className="flex w-full items-center space-x-2">
+              <div key={game.id} className="flex w-full flex-col">
+                <div className="flex w-full items-center space-x-2">
                   <div className="grid w-full grid-cols-1 gap-4 sm:grid-cols-2">
                     <TextField
                       name={`games.${i}.opponentElo`}
@@ -223,7 +242,18 @@ export const ManualEloForm = () => {
           </div>
         )}
 
-        <div className="mt-8 flex justify-end">
+        <div className="mt-8 flex justify-end gap-4">
+          {!isDefault && (
+            <button
+              onClick={() => {
+                form.reset();
+              }}
+              type="button"
+              className="px-5 py-3 text-center text-sm font-medium text-primary-600 hover:text-primary-800 focus:outline-none focus:ring-4 focus:ring-primary-300 disabled:opacity-25 dark:text-white dark:hover:text-primary-700 dark:focus:ring-primary-800 sm:w-fit"
+            >
+              {t("clearButton")}
+            </button>
+          )}
           <button
             onClick={() => {
               appendGame({});

src/hooks/useFormPersist.ts

@@ -0,0 +1,93 @@
+import { useEffect } from "react";
+
+import { SetFieldValue } from "react-hook-form";
+
+export interface FormPersistConfig {
+  storage?: Storage;
+  watch: (names?: string | string[]) => any;
+  setValue: SetFieldValue<any>;
+  exclude?: string[];
+  onDataRestored?: (data: any) => void;
+  validate?: boolean;
+  dirty?: boolean;
+  touch?: boolean;
+  onTimeout?: () => void;
+  timeout?: number;
+}
+
+const useFormPersist = (
+  name: string,
+  {
+    storage,
+    watch,
+    setValue,
+    exclude = [],
+    onDataRestored,
+    validate = false,
+    dirty = false,
+    touch = false,
+    onTimeout,
+    timeout,
+  }: FormPersistConfig,
+) => {
+  const watchedValues = watch();
+
+  const getStorage = () => storage || window.sessionStorage;
+
+  const clearStorage = () => getStorage().removeItem(name);
+
+  useEffect(() => {
+    const str = getStorage().getItem(name);
+
+    if (str) {
+      const { _timestamp = null, ...values } = JSON.parse(str);
+      const dataRestored: { [key: string]: any } = {};
+      const currTimestamp = Date.now();
+
+      if (timeout && currTimestamp - _timestamp > timeout) {
+        onTimeout && onTimeout();
+        clearStorage();
+        return;
+      }
+
+      Object.keys(values).forEach((key) => {
+        const shouldSet = !exclude.includes(key);
+        if (shouldSet) {
+          dataRestored[key] = values[key];
+          setValue(key, values[key], {
+            shouldValidate: validate,
+            shouldDirty: dirty,
+            shouldTouch: touch,
+          });
+        }
+      });
+
+      if (onDataRestored) {
+        onDataRestored(dataRestored);
+      }
+
+      return () => getStorage().setItem(name, JSON.stringify(dataRestored));
+    }
+  }, [storage, name, onDataRestored, setValue]);
+
+  useEffect(() => {
+    const values = exclude.length
+      ? Object.entries(watchedValues)
+          .filter(([key]) => !exclude.includes(key))
+          .reduce((obj, [key, val]) => Object.assign(obj, { [key]: val }), {})
+      : Object.assign({}, watchedValues);
+
+    if (Object.entries(values).length) {
+      if (timeout !== undefined) {
+        values._timestamp = Date.now();
+      }
+      getStorage().setItem(name, JSON.stringify(values));
+    }
+  }, [watchedValues, timeout]);
+
+  return {
+    clear: () => getStorage().removeItem(name),
+  };
+};
+
+export default useFormPersist;

src/messages/en.json

@@ -151,6 +151,7 @@
     "gameResultPlaceholder": "Result...",
     "gameResult": "{result, select, win {Win} draw {Draw} loss {Loss} other {{result}}}",
     "addGameButton": "Add another game result",
+    "clearButton": "Clear",
 
     "searchTournamentPlaceholder": "Find a tournament...",
     "noTournamentsFound": "No tournaments found",

src/messages/fr.json

@@ -153,6 +153,7 @@
     "gameResultPlaceholder": "Résultat...",
     "gameResult": "{result, select, win {Victoire} draw {Nul} loss {Défaite} other {{result}}}",
     "addGameButton": "Ajouter un autre résultat de partie",
+    "clearButton": "Effacer",
 
     "searchTournamentPlaceholder": "Rechecher un tournois...",
     "noTournamentsFound": "Aucun tournoi trouvé",