Discord threads (#16)

* Add initial support for discord threads

* Finish thread creation

7 files changed, 153 insertions, 38 deletions

diff --git a/.env.example b/.env.example
index 51168fc..6636fb9 100644
--- a/.env.example
+++ b/.env.example
@@ -17,6 +17,7 @@ SERVER_REDIRECT_URI=http://127.0.0.1:3000/api/oauth/redirect
 DISCORD_CLIENT_ID=
 DISCORD_CLIENT_SECRET=
 DISCORD_USER_AGENT=
+DISCORD_BOT_TOKEN=
 
 JWT_SECRET=aVerySecretJwtSigningSecret
 
@@ -27,6 +28,6 @@ REACT_APP_SSH_PORT=42069
 REDIS_HOST=localhost
 REDIS_PORT=6379
 
-NEW_GAME_PINGABLE_ROLE_ID=1123232
-NEW_GAME_CHANNEL_WEBHOOK=https://discordapp.com/api/webhooks/
-REMIND_MOVE_CHANNEL_WEBHOOK=https://discordapp.com/api/webhooks/
\ No newline at end of file
+NEW_GAME_PINGABLE_ROLE_ID=10
+REMIND_MOVE_CHANNEL_ID=91
+NEW_GAME_CHANNEL_ID=91
diff --git a/config/config.exs b/config/config.exs
index e732049..5ada6e6 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -15,7 +15,7 @@ config :chessh, RateLimits,
   player_public_keys: 15,
   create_game_ms: 60 * 1000,
   create_game_rate: 3,
-  discord_notification_rate: 3,
+  discord_notification_rate: 30,
   discord_notification_rate_ms: 1000
 
 config :chessh, Web,
@@ -24,8 +24,8 @@ config :chessh, Web,
   discord_scope: "identify"
 
 config :chessh, DiscordNotifications,
-  game_move_notif_delay_ms: 3 * 60 * 1000,
-  game_created_notif_delay_ms: 30 * 1000,
+  game_move_notif_delay_ms: 10 * 1000,
+  game_created_notif_delay_ms: 10 * 1000,
   reschedule_delay: 5 * 1000
 
 config :joken, default_signer: "secret"
diff --git a/config/runtime.exs b/config/runtime.exs
index 684e48e..5da6d47 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -5,8 +5,9 @@ config :chessh,
 
 config :chessh, DiscordNotifications,
   looking_for_games_role_mention: "<@&#{System.get_env("NEW_GAME_PINGABLE_ROLE_ID")}>",
-  discord_game_move_notif_webhook: System.get_env("REMIND_MOVE_CHANNEL_WEBHOOK"),
-  discord_new_game_notif_webhook: System.get_env("NEW_GAME_CHANNEL_WEBHOOK")
+  remind_move_channel_id: System.get_env("REMIND_MOVE_CHANNEL_ID"),
+  discord_bot_token: System.get_env("DISCORD_BOT_TOKEN"),
+  new_game_channel_id: System.get_env("NEW_GAME_CHANNEL_ID")
 
 config :chessh, Web,
   discord_client_id: System.get_env("DISCORD_CLIENT_ID"),
diff --git a/lib/chessh/discord/notifier.ex b/lib/chessh/discord/notifier.ex
index 6d7bd46..02b7c5f 100644
--- a/lib/chessh/discord/notifier.ex
+++ b/lib/chessh/discord/notifier.ex
@@ -28,7 +28,7 @@ defmodule Chessh.DiscordNotifier do
 
     case Hammer.check_rate_inc(
            :redis,
-           "discord-webhook-message-rate",
+           "discord-rate",
            discord_notification_rate_ms,
            discord_notification_rate,
            1
@@ -50,9 +50,9 @@ defmodule Chessh.DiscordNotifier do
   end
 
   defp send_notification({:move_reminder, game_id}) do
-    [min_delta_t, discord_game_move_notif_webhook] =
+    [min_delta_t, remind_move_channel_id] =
       Application.get_env(:chessh, DiscordNotifications)
-      |> Keyword.take([:game_move_notif_delay_ms, :discord_game_move_notif_webhook])
+      |> Keyword.take([:game_move_notif_delay_ms, :remind_move_channel_id])
       |> Keyword.values()
 
     case Repo.get(Game, game_id) |> Repo.preload([:dark_player, :light_player]) do
@@ -62,13 +62,27 @@ defmodule Chessh.DiscordNotifier do
         turn: turn,
         updated_at: last_updated,
         moves: move_count,
-        status: :continue
-      } ->
+        status: :continue,
+        discord_thread_id: discord_thread_id
+      } = game ->
         delta_t = NaiveDateTime.diff(NaiveDateTime.utc_now(), last_updated, :millisecond)
 
+        game =
+          if is_nil(discord_thread_id) do
+            {:ok, game} =
+              Game.changeset(game, %{
+                discord_thread_id: make_private_discord_thread_id(remind_move_channel_id, game)
+              })
+              |> Repo.update()
+
+            game
+          else
+            game
+          end
+
         if delta_t >= min_delta_t do
           post_discord(
-            discord_game_move_notif_webhook,
+            game.discord_thread_id,
             "<@#{if turn == :light, do: light_player_discord_id, else: dark_player_discord_id}> it is your move in Game #{game_id} (move #{move_count})."
           )
         end
@@ -78,16 +92,33 @@ defmodule Chessh.DiscordNotifier do
     end
   end
 
+  defp send_notification({:cleanup_thread, game_id}) do
+    case Repo.get(Game, game_id) |> Repo.preload([:dark_player, :light_player]) do
+      %Game{
+        discord_thread_id: discord_thread_id,
+        status: status
+      } = game ->
+        if !is_nil(discord_thread_id) && status != :continue do
+          destroy_channel(discord_thread_id)
+
+          Game.changeset(game, %{
+            discord_thread_id: nil
+          })
+          |> Repo.update()
+        end
+
+      _ ->
+        nil
+    end
+  end
+
   defp send_notification({:game_created, game_id}) do
-    [pingable_mention, discord_game_created_notif_webhook] =
+    [pingable_mention, new_game_channel_id] =
       Application.get_env(:chessh, DiscordNotifications)
-      |> Keyword.take([:looking_for_games_role_mention, :discord_new_game_notif_webhook])
+      |> Keyword.take([:looking_for_games_role_mention, :new_game_channel_id])
       |> Keyword.values()
 
     case Repo.get(Game, game_id) do
-      nil ->
-        nil
-
       game ->
         %Game{
           dark_player: dark_player,
@@ -107,22 +138,85 @@ defmodule Chessh.DiscordNotifier do
           end
 
         if message do
-          post_discord(discord_game_created_notif_webhook, message)
+          post_discord(new_game_channel_id, message)
         end
+
+      nil ->
+        nil
+    end
+  end
+
+  defp make_private_discord_thread_id(channel_id, %Game{
+         id: game_id,
+         dark_player: %Player{discord_id: dark_player_discord_id, username: dark_username},
+         light_player: %Player{discord_id: light_player_discord_id, username: light_username}
+       }) do
+    case make_discord_api_call(
+           :post,
+           "channels/#{channel_id}/threads",
+           %{
+             # Private thread
+             type: 12,
+             name: "Game #{game_id} - #{light_username} V #{dark_username}"
+           }
+         ) do
+      {:ok, {_, _, body}} ->
+        %{"id" => thread_id} = Jason.decode!(body)
+
+        [light_player_discord_id, dark_player_discord_id]
+        |> Enum.map(fn id ->
+          make_discord_api_call(:put, 'channels/#{thread_id}/thread-members/#{id}')
+        end)
+
+        thread_id
+
+      _ ->
+        nil
     end
   end
 
-  defp post_discord(webhook, message) do
-    :httpc.request(
-      :post,
-      {
-        String.to_charlist(webhook),
+  defp post_discord(channel_id, message) do
+    make_discord_api_call(:post, "channels/#{channel_id}/messages", %{content: message})
+  end
+
+  defp destroy_channel(channel_id) do
+    make_discord_api_call(:delete, "channels/#{channel_id}")
+  end
+
+  defp make_discord_api_call(method, route),
+    do:
+      :httpc.request(
+        method,
+        {
+          'https://discord.com/api/#{route}',
+          [
+            make_authorization_header()
+          ]
+        },
         [],
-        'application/json',
-        %{content: message} |> Jason.encode!() |> String.to_charlist()
-      },
-      [],
-      []
-    )
+        []
+      )
+
+  defp make_discord_api_call(method, route, body),
+    do:
+      :httpc.request(
+        method,
+        {
+          'https://discord.com/api/#{route}',
+          [
+            make_authorization_header()
+          ],
+          'application/json',
+          body
+          |> Jason.encode!()
+          |> String.to_charlist()
+        },
+        [],
+        []
+      )
+
+  defp make_authorization_header() do
+    bot_token = Application.get_env(:chessh, DiscordNotifications)[:discord_bot_token]
+    {'Authorization', 'Bot #{bot_token}'}
   end
 end
diff --git a/lib/chessh/schema/game.ex b/lib/chessh/schema/game.ex
index b7893f1..55b9ea4 100644
--- a/lib/chessh/schema/game.ex
+++ b/lib/chessh/schema/game.ex
@@ -15,6 +15,8 @@ defmodule Chessh.Game do
     belongs_to(:light_player, Player, foreign_key: :light_player_id)
     belongs_to(:dark_player, Player, foreign_key: :dark_player_id)
 
+    field(:discord_thread_id, :string)
+
     timestamps()
   end
 
@@ -28,7 +30,8 @@ defmodule Chessh.Game do
       :status,
       :last_move,
       :light_player_id,
-      :dark_player_id
+      :dark_player_id,
+      :discord_thread_id
     ])
   end
 end
diff --git a/lib/chessh/ssh/client/game/game.ex b/lib/chessh/ssh/client/game/game.ex
index d6b0b5b..6b2ef60 100644
--- a/lib/chessh/ssh/client/game/game.ex
+++ b/lib/chessh/ssh/client/game/game.ex
@@ -396,7 +396,7 @@ defmodule Chessh.SSH.Client.Game do
       {:ok, status} ->
         {:ok, fen} = :binbo.get_fen(binbo_pid)
 
-        {:ok, _new_game} =
+        {:ok, %Game{status: after_move_status}} =
           game
           |> Game.changeset(
             Map.merge(
@@ -413,11 +413,18 @@ defmodule Chessh.SSH.Client.Game do
 
         :syn.publish(:games, {:game, game_id}, {:new_move, attempted_move})
 
-        GenServer.cast(
-          :discord_notifier,
-          {:schedule_notification, {:move_reminder, game_id},
-           Application.get_env(:chessh, DiscordNotifications)[:game_move_notif_delay_ms]}
-        )
+        if after_move_status == :continue do
+          GenServer.cast(
+            :discord_notifier,
+            {:schedule_notification, {:move_reminder, game_id},
+             Application.get_env(:chessh, DiscordNotifications)[:game_move_notif_delay_ms]}
+          )
+        else
+          GenServer.cast(
+            :discord_notifier,
+            {:schedule_notification, {:cleanup_thread, game_id}, 0}
+          )
+        end
 
       _ ->
         nil
diff --git a/priv/repo/migrations/20230202004927_add_discord_thread_id.exs b/priv/repo/migrations/20230202004927_add_discord_thread_id.exs
new file mode 100644
index 0000000..8c7c83a
--- /dev/null
+++ b/priv/repo/migrations/20230202004927_add_discord_thread_id.exs
@@ -0,0 +1,9 @@
+defmodule Chessh.Repo.Migrations.AddDiscordThreadId do
+  use Ecto.Migration
+
+  def change do
+    alter table(:games) do
+      add(:discord_thread_id, :string, null: true)
+    end
+  end
+end