Persistent game (#5)

* Remove unnecessary server in board

* Initial persistent games

* Remove done chessh README stuff, warning issue

* Show current players and move

* Add promotion

* Merge default changeset on all status

1 files changed, 359 insertions, 0 deletions

diff --git a/lib/chessh/ssh/client/game/game.ex b/lib/chessh/ssh/client/game/game.ex
new file mode 100644
index 0000000..2ee6dca
--- /dev/null
+++ b/lib/chessh/ssh/client/game/game.ex
@@ -0,0 +1,359 @@
+defmodule Chessh.SSH.Client.Game do
+  require Logger
+  alias Chessh.{Game, Utils, Repo}
+  alias Chessh.SSH.Client.Game.Renderer
+
+  @default_fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
+
+  defmodule State do
+    defstruct cursor: %{x: 7, y: 7},
+              highlighted: %{},
+              move_from: nil,
+              game: nil,
+              client_pid: nil,
+              binbo_pid: nil,
+              width: 0,
+              height: 0,
+              flipped: false,
+              color: nil,
+              player_session: nil
+  end
+
+  use Chessh.SSH.Client.Screen
+
+  defp initialize_game(game_id, fen) do
+    :syn.add_node_to_scopes([:games])
+    :ok = :syn.join(:games, {:game, game_id}, self())
+
+    :binbo.start()
+    {:ok, binbo_pid} = :binbo.new_server()
+    :binbo.new_game(binbo_pid, fen)
+
+    binbo_pid
+  end
+
+  def init([
+        %State{
+          color: color,
+          game: %Game{dark_player_id: dark_player_id, light_player_id: light_player_id}
+        } = state
+        | tail
+      ])
+      when is_nil(color) do
+    new_state =
+      case {is_nil(dark_player_id), is_nil(light_player_id)} do
+        {true, false} -> %State{state | color: :dark}
+        {false, true} -> %State{state | color: :light}
+        {_, _} -> %State{state | color: Enum.random([:light, :dark])}
+      end
+
+    init([new_state | tail])
+  end
+
+  def init([
+        %State{
+          player_session: player_session,
+          color: color,
+          client_pid: client_pid,
+          game:
+            %Game{
+              id: game_id,
+              fen: fen,
+              dark_player_id: dark_player_id,
+              light_player_id: light_player_id
+            } = game
+        } = state
+        | _
+      ]) do
+    maybe_changeset =
+      case color do
+        :light ->
+          if !light_player_id,
+            do: Game.changeset(game, %{light_player_id: player_session.player_id})
+
+        :dark ->
+          if !dark_player_id,
+            do: Game.changeset(game, %{dark_player_id: player_session.player_id})
+      end
+
+    {status, maybe_joined_game} =
+      if maybe_changeset do
+        maybe_changeset
+        |> Repo.update()
+      else
+        {:undefined, nil}
+      end
+
+    if status == :ok && maybe_joined_game do
+      :syn.publish(:games, {:game, game_id}, :player_joined)
+    end
+
+    binbo_pid = initialize_game(game_id, fen)
+    send(client_pid, {:send_to_ssh, Utils.clear_codes()})
+
+    new_game = Repo.get(Game, game_id) |> Repo.preload([:light_player, :dark_player])
+
+    new_state = %State{
+      state
+      | binbo_pid: binbo_pid,
+        color: if(new_game.light_player_id == player_session.player_id, do: :light, else: :dark),
+        game: new_game
+    }
+
+    {:ok, new_state}
+  end
+
+  def init([
+        %State{player_session: player_session, color: color, client_pid: client_pid, game: nil} =
+          state
+        | _
+      ]) do
+    {:ok, %Game{id: game_id, fen: fen}} =
+      Game.changeset(
+        %Game{},
+        Map.merge(
+          if(color == :light,
+            do: %{light_player_id: player_session.player_id},
+            else: %{dark_player_id: player_session.player_id}
+          ),
+          %{
+            fen: @default_fen
+          }
+        )
+      )
+      |> Repo.insert()
+
+    binbo_pid = initialize_game(game_id, fen)
+    send(client_pid, {:send_to_ssh, Utils.clear_codes()})
+
+    {:ok,
+     %State{
+       state
+       | game: Repo.get(Game, game_id) |> Repo.preload([:light_player, :dark_player]),
+         binbo_pid: binbo_pid
+     }}
+  end
+
+  def handle_info(
+        {:new_move, move},
+        %State{game: %Game{id: game_id}, client_pid: client_pid, binbo_pid: binbo_pid} = state
+      ) do
+    :binbo.move(binbo_pid, move)
+
+    new_state = %State{
+      state
+      | game: Repo.get(Game, game_id) |> Repo.preload([:light_player, :dark_player])
+    }
+
+    send(client_pid, {:send_to_ssh, render_state(new_state)})
+
+    {:noreply, new_state}
+  end
+
+  def handle_info(
+        :player_joined,
+        %State{client_pid: client_pid, game: %Game{id: game_id}} = state
+      ) do
+    game = Repo.get(Game, game_id) |> Repo.preload([:light_player, :dark_player])
+    new_state = %State{state | game: game}
+    send(client_pid, {:send_to_ssh, render_state(new_state)})
+    {:noreply, new_state}
+  end
+
+  def input(
+        width,
+        height,
+        action,
+        %State{
+          move_from: move_from,
+          cursor: %{x: cursor_x, y: cursor_y} = cursor,
+          client_pid: client_pid,
+          flipped: flipped,
+          binbo_pid: binbo_pid
+        } = state
+      ) do
+    new_cursor =
+      case action do
+        :left -> %{y: cursor_y, x: Utils.wrap_around(cursor_x, -1, Renderer.chess_board_width())}
+        :right -> %{y: cursor_y, x: Utils.wrap_around(cursor_x, 1, Renderer.chess_board_width())}
+        :down -> %{y: Utils.wrap_around(cursor_y, 1, Renderer.chess_board_height()), x: cursor_x}
+        :up -> %{y: Utils.wrap_around(cursor_y, -1, Renderer.chess_board_height()), x: cursor_x}
+        _ -> cursor
+      end
+
+    {new_move_from, move_to} =
+      if action == :return do
+        coords = {new_cursor.y, new_cursor.x}
+
+        case move_from do
+          nil -> {coords, nil}
+          _ -> {nil, coords}
+        end
+      else
+        {move_from, nil}
+      end
+
+    new_state = %State{
+      state
+      | cursor: new_cursor,
+        move_from: new_move_from,
+        highlighted: %{
+          {new_cursor.y, new_cursor.x} => Renderer.to_select_background(),
+          new_move_from => Renderer.from_select_background()
+        },
+        width: width,
+        height: height,
+        flipped: if(action == "f", do: !flipped, else: flipped)
+    }
+
+    if move_from && move_to do
+      maybe_flipped_from = if flipped, do: flip(move_from), else: move_from
+      maybe_flipped_to = if flipped, do: flip(move_to), else: move_to
+
+      piece_type =
+        :binbo_position.get_piece(
+          :binbo_board.notation_to_index(Renderer.to_chess_coord(maybe_flipped_from)),
+          :binbo.game_state(binbo_pid)
+        )
+
+      promotion_possible =
+        case piece_type do
+          1 ->
+            # Light pawn
+            {y, _} = maybe_flipped_to
+            y == 0
+
+          17 ->
+            # Dark pawn
+            {y, _} = maybe_flipped_to
+            y == Renderer.chess_board_height() - 1
+
+          _ ->
+            false
+        end
+
+      if promotion_possible do
+        send(
+          client_pid,
+          {:set_screen_process, Chessh.SSH.Client.Game.PromotionScreen,
+           %Chessh.SSH.Client.Game.PromotionScreen.State{
+             client_pid: client_pid,
+             game_pid: self(),
+             game_state: new_state
+           }}
+        )
+
+        receive do
+          {:promotion, promotion} ->
+            attempt_move(move_from, move_to, state, promotion)
+        end
+      else
+        attempt_move(move_from, move_to, state)
+      end
+    end
+
+    send(client_pid, {:send_to_ssh, render_state(new_state)})
+    new_state
+  end
+
+  def render(width, height, %State{client_pid: client_pid} = state) do
+    new_state = %State{state | width: width, height: height}
+    send(client_pid, {:send_to_ssh, render_state(new_state)})
+    new_state
+  end
+
+  defp attempt_move(
+         from,
+         to,
+         %State{} = state
+       ),
+       do: attempt_move(from, to, state, nil)
+
+  defp attempt_move(
+         from,
+         to,
+         %State{
+           game: %Game{id: game_id, turn: turn},
+           binbo_pid: binbo_pid,
+           flipped: flipped,
+           color: turn
+         },
+         promotion
+       ) do
+    attempted_move =
+      if(flipped,
+        do: "#{Renderer.to_chess_coord(flip(from))}#{Renderer.to_chess_coord(flip(to))}",
+        else: "#{Renderer.to_chess_coord(from)}#{Renderer.to_chess_coord(to)}"
+      ) <>
+        if(promotion, do: promotion, else: "")
+
+    game = Repo.get(Game, game_id)
+
+    case :binbo.move(
+           binbo_pid,
+           attempted_move
+         ) do
+      {:ok, status} ->
+        {:ok, fen} = :binbo.get_fen(binbo_pid)
+
+        default_changeset = %{
+          fen: fen,
+          moves: game.moves + 1,
+          turn: if(game.turn == :dark, do: :light, else: :dark)
+        }
+
+        case status do
+          :continue ->
+            {:ok, _new_game} =
+              Game.changeset(
+                game,
+                default_changeset
+              )
+              |> Repo.update()
+
+          {:draw, _} ->
+            Game.changeset(
+              game,
+              Map.merge(default_changeset, %{status: :draw})
+            )
+            |> Repo.update()
+
+          {:checkmate, :white_wins} ->
+            Game.changeset(
+              game,
+              Map.merge(default_changeset, %{status: :winner, winner: :light})
+            )
+            |> Repo.update()
+
+          {:checkmate, :black_wins} ->
+            Game.changeset(
+              game,
+              Map.merge(default_changeset, %{status: :winner, winner: :dark})
+            )
+            |> Repo.update()
+        end
+
+        :syn.publish(:games, {:game, game_id}, {:new_move, attempted_move})
+
+      x ->
+        Logger.debug(inspect(x))
+        nil
+    end
+  end
+
+  defp attempt_move(_, _, _, _) do
+    Logger.debug("No matching clause for move attempt - must be illegal?")
+    nil
+  end
+
+  defp flip({y, x}),
+    do: {Renderer.chess_board_height() - 1 - y, Renderer.chess_board_width() - 1 - x}
+
+  defp render_state(
+         %State{
+           game: %Game{fen: fen}
+         } = state
+       ) do
+    Renderer.render_board_state(fen, state)
+  end
+end