Add basic state to GameState service (#2)

src/services/GameState.service.js

@@ -1,8 +1,83 @@
+import { Player, GridCellState, GameState } from '../module/util.js'
+
 /**
  * Singleton service for managing the state of the game.
  */
 export class GameStateService {
+    /**
+     * A mapping of player => game board state.
+     * @private
+     * @type {object}
+     */
+    player_x_game_board = {}
+
+    /**
+     * An array of all players. This is mostly for internal purposes.
+     * @private
+     * @type {(string)[]}
+     */
+    players = [Player.One, Player.Two]
+
+    /**
+     * Number of rows in the grid.
+     * @private
+     * @type {number}
+     */
+    n_rows = 9
+
+    /**
+     * Number of cols in the grid.
+     * @private
+     * @type {number}
+     */
+    n_cols = 9
+
+    /**
+     * The current state of the game.
+     * @private
+     * @type {string}
+     */
+    current_state = GameState.ChoosingNumberOfShips
+
+    /**
+     * The current player.
+     * @type {string}
+     */
+    current_player = Player.One
+
+    /**
+     * Construct a new game service. Initialize any internal states.
+     */
+    constructor() {
+        // Generate empty boards for each player
+        for ( const player of this.players ) {
+            this.player_x_game_board[player] = this._build_empty_board()
+        }
+    }
+
+    /**
+     * Get the dimensions of the board as [rows, cols].
+     * @example const [n_rows, n_cols] = game_service.get_dimensions()
+     * @return {[number, number]}
+     */
+    get_dimensions() {
+        return [this.n_rows, this.n_cols]
+    }
 
+    /**
+     * Build an empty structure of grid cells.
+     * @return {object[][]}
+     * @private
+     */
+    _build_empty_board() {
+        return Array(this.n_rows).fill('').map(_ => {
+            return Array(this.n_cols).fill('').map(_ => {
+                return {
+                    render: GridCellState.Available,
+                }
+            })
+        })
+    }
 }
 
 // Export a single instance, so it can be shared by all files