Projects and Diseases placeholder application commands (#17)

* fix module name in backup

* save projects to persistent_term

* retrieve projects on bot startup

* remove commented out code

* register project autocomplete

* placeholder text for project

* placeholder disease command

lib/plantnet/projects.ex

@@ -0,0 +1,46 @@
+defmodule PlantIdDiscordBot.PlantNet.Projects do
+  @moduledoc """
+  Functions related to PlantNet's projecs
+  """
+  require Logger
+  alias HTTPoison.Response
+
+  @plantnet_api_base_url Application.compile_env(:plantid_discord_bot, :plantnet_api_base_url)
+
+  def fetch_projects do
+    try do
+      build_query_uri()
+      |> get_response()
+      |> parse_response()
+      |> save_projects()
+    rescue
+      e ->
+        Logger.error(Exception.format(:error, e, __STACKTRACE__))
+    end
+  end
+
+  defp build_query_uri do
+    URI.parse("#{@plantnet_api_base_url}/projects")
+    |> URI.append_query("lang=en")
+    |> URI.append_query("type=kt")
+    |> URI.append_query("api-key=#{Application.get_env(:plantid_discord_bot, :plantnet_api_key)}")
+    |> URI.to_string()
+  end
+
+  defp get_response(query_uri), do: HTTPoison.get!(query_uri)
+
+  defp parse_response(%Response{status_code: 200, body: body}), do: Jason.decode!(body)
+
+  defp parse_response(%Response{status_code: 401, body: body}) do
+    Logger.critical("Unauthorized request to PlantNet API: #{body}")
+  end
+
+  defp save_projects(projects), do: :persistent_term.put(:projects, projects)
+
+  def retrieve_projects, do: :persistent_term.get(:projects)
+
+  def find_project_by_description(description) do
+    retrieve_projects()
+    |> Enum.find(&(&1["description"] == description))
+  end
+end