Now we're correctly handling moves

lib/chess/board.ex

@@ -42,8 +42,8 @@ defmodule Chess.Board do
       if castling_move?(piece, from_file, to_file) do
         board
         |> castling_move(%{
-          "from" => [from_file, from_rank],
-          "to" => [to_file, to_rank]
+          from: {from_file, from_rank},
+          to: {to_file, to_rank}
         })
         |> Map.get(:board)
       else
@@ -65,7 +65,7 @@ defmodule Chess.Board do
 
   def castling_move?(_, _, _), do: false
 
-  def castling_move(board, %{"from" => [4, rank], "to" => [2, _rank]}) do
+  def castling_move(board, %{from: {4, rank}, to: {2, _rank}}) do
     move_piece(board, %{
       "from" => [0, rank],
       "to" => [3, rank]

lib/chess/game_state.ex

@@ -68,7 +68,7 @@ defmodule Chess.GameState do
     |> Moves.available({file, rank})
     |> Enum.all?(fn {to_file, to_rank} ->
       board
-      |> Board.move_piece(%{"from" => [file, rank], "to" => [to_file, to_rank]})
+      |> Board.move_piece(%{from: {file, rank}, to: {to_file, to_rank}})
       |> Map.get(:board)
       |> king_in_check?(piece["colour"])
     end)

lib/chess/moves/pieces/king/castling.ex

@@ -79,7 +79,7 @@ defmodule Chess.Moves.Pieces.King.Castling do
     [{2, rank}, {3, rank}]
     |> Enum.any?(fn {to_file, to_rank} ->
       board
-      |> Board.move_piece(%{"from" => [4, rank], "to" => [to_file, to_rank]})
+      |> Board.move_piece(%{from: {4, rank}, to: {to_file, to_rank}})
       |> Map.get(:board)
       |> GameState.king_in_check?(colour)
     end)
@@ -89,7 +89,7 @@ defmodule Chess.Moves.Pieces.King.Castling do
     [{5, rank}, {6, rank}]
     |> Enum.any?(fn {to_file, to_rank} ->
       board
-      |> Board.move_piece(%{"from" => [4, rank], "to" => [to_file, to_rank]})
+      |> Board.move_piece(%{from: {4, rank}, to: {to_file, to_rank}})
       |> Map.get(:board)
       |> GameState.king_in_check?(colour)
     end)

lib/chess_web/templates/game/board.html.leex

@@ -1,4 +1,4 @@
-<div class="board board--black-to-move board--player-is-<%= player_colour(@user, @game) %>">
+<div class="board board--<%= @game.turn %>-to-move board--player-is-<%= player_colour(@user, @game) %>">
   <div class="board__rank-labels">
     <div class="board__label">1</div>
     <div class="board__label">2</div>
@@ -22,14 +22,14 @@
   </div>
 
   <div class="board__body">
-    <%= for rank <- 0..7 do %>
+    <%= for {rank, row} <- @board do %>
       <div class="board__row">
-        <%= for file <- 0..7 do %>
+        <%= for {file, piece} <- row do %>
           <%= render ChessWeb.SquareView,
             "square.html",
             rank: rank,
             file: file,
-            piece: @game.board["#{file},#{rank}"],
+            piece: piece,
             selected: {file, rank} == @selected,
             available: {file, rank} in @available %>
         <% end %>

lib/chess_web/views/live/board_live.ex

@@ -5,6 +5,7 @@ defmodule ChessWeb.BoardLive do
   alias Chess.Store.Game
   alias Chess.Repo
   alias Chess.Board
+  alias Chess.Moves
 
   import Chess.Auth, only: [get_user!: 1]
 
@@ -19,11 +20,24 @@ defmodule ChessWeb.BoardLive do
       Game.for_user(user)
       |> Repo.get!(game_id)
 
-    {:ok, assign(socket, game: game, user: user, selected: nil, available: [])}
+    {:ok, assign(socket, default_assigns(game, user))}
   end
 
   def handle_event("click", %{"rank" => rank, "file" => file}, socket) do
-    {:noreply, socket |> handle_click(file, rank)}
+    {
+      :noreply,
+      socket |> handle_click(String.to_integer(file), String.to_integer(rank))
+    }
+  end
+
+  defp default_assigns(game, user) do
+    %{
+      board: Board.transform(game.board),
+      game: game,
+      user: user,
+      selected: nil,
+      available: []
+    }
   end
 
   defp handle_click(socket, file, rank) do
@@ -34,27 +48,56 @@ defmodule ChessWeb.BoardLive do
     colour = ChessWeb.GameView.player_colour(user, game)
 
     assigns =
+      if colour == game.turn do
         case socket.assigns do
-        %{:selected => nil} ->
-          case Board.piece(board, {file, rank}) do
-            %{"colour" => ^colour} ->
-              [{:selected, selected(file, rank)}]
+          %{selected: nil} ->
+            handle_selection(board, colour, file, rank)
 
           _ ->
-              []
+            handle_move(socket.assigns, file, rank)
         end
-
-        _ ->
-          [{:selected, nil}]
       end
 
     assign(socket, assigns)
   end
 
-  defp selected(file, rank) do
-    {
-      String.to_integer(file),
-      String.to_integer(rank)
-    }
+  defp handle_selection(board, colour, file, rank) do
+    case Board.piece(board, {file, rank}) do
+      %{"colour" => ^colour} ->
+        [
+          {:selected, {file, rank}},
+          {:available, Moves.available(board, {file, rank})}
+        ]
+
+      _ ->
+        []
+    end
+  end
+
+  defp handle_move(
+         %{game: game, available: available, selected: selected},
+         file,
+         rank
+       ) do
+    if {file, rank} in available do
+      new_game =
+        game
+        |> Moves.make_move(%{from: selected, to: {file, rank}})
+        |> case do
+          {:ok, %{game: new_game}} ->
+            new_game
+        end
+
+      new_board = Board.transform(new_game.board)
+
+      [
+        {:selected, nil},
+        {:available, []},
+        {:board, new_board},
+        {:game, new_game}
+      ]
+    else
+      [{:selected, nil}, {:available, []}]
+    end
   end
 end

test/chess/store/game_test.exs

@@ -90,7 +90,7 @@ defmodule Chess.Store.GameTest do
           opponent_id: opponent.id
         })
 
-      move_params = %{"from" => [4, 1], "to" => [4, 3]}
+      move_params = %{from: {4, 1}, to: {4, 3}}
 
       changeset =
         Game.move_changeset(