game: Store players in both an array _and_ a session-indexed object

[empires-server] / tictactoe.js

diff --git a/tictactoe.js b/tictactoe.js
index a60eed600c9bdccde3736d56bf2b988dd1a9e892..98564799c438e57460c96a1a1feaac243cd11318 100644 (file)
--- a/tictactoe.js
+++ b/tictactoe.js
@@ -7,25 +7,38 @@ class TicTacToe extends Game {
     this.state = {
       moves: [],
       board: Array(9).fill(""),
-      next_player: "X",
+      team_to_play: "X",
     };
+    this.teams = ["X", "O"];
   }
 
-  /* Returns Boolean indicating whether move was legal and added. */
-  add_move(square) {
+  /* Returns true if move was legal and added, false otherwise. */
+  add_move(player, square) {
+
+    const state = this.state;
+    const result = super.add_move(player, square);
+
+    /* If the generic Game class can reject this move, then we don't
+     * need to look at it any further. */
+    if (! result.legal)
+      return result;
+
     /* Cannot move to an occupied square. */
-    if (this.state.board[square])
-      return false;
+    if (state.board[square])
+    {
+      return { legal: false,
+               message: "Square is already occupied" };
+    }
 
-    this.state.board[square] = this.state.next_player;
-    this.state.moves.push(square);
+    state.board[square] = state.team_to_play;
+    state.moves.push(square);
 
-    if (this.state.next_player === "X")
-      this.state.next_player = "O";
+    if (state.team_to_play === "X")
+      state.team_to_play = "O";
     else
-      this.state.next_player = "X";
+      state.team_to_play = "X";
 
-    return true;
+    return { legal: true };
   }
 }