import { describe, it, expect } from 'vitest';
import { createGameContext } from '../../src/core/context';
import { registerTicTacToeRules, startTicTacToe, type TicTacToeState } from '../../src/samples/tic-tac-toe';

describe('Tic-Tac-Toe', () => {
    function createGame() {
        const game = createGameContext();
        registerTicTacToeRules(game);
        return game;
    }

    function getBoardState(game: ReturnType<typeof createGame>) {
        return game.latestContext<TicTacToeState>('tic-tac-toe')!.value;
    }

    it('should initialize the board and start the game', () => {
        const game = createGame();
        startTicTacToe(game);

        const state = getBoardState(game);
        expect(state.currentPlayer).toBe('X');
        expect(state.winner).toBeNull();
        expect(state.moveCount).toBe(0);

        const board = game.regions.get('board');
        expect(board.value.axes).toHaveLength(2);
        expect(board.value.axes[0].name).toBe('x');
        expect(board.value.axes[1].name).toBe('y');
    });

    it('should play moves and determine a winner', () => {
        const game = createGame();
        startTicTacToe(game);

        // X wins with column 0
        game.dispatchCommand('play X 0 0');
        game.dispatchCommand('play O 0 1');
        game.dispatchCommand('play X 1 0');
        game.dispatchCommand('play O 1 1');
        game.dispatchCommand('play X 2 0');

        const state = getBoardState(game);
        expect(state.winner).toBe('X');
        expect(state.moveCount).toBe(5);
    });

    it('should reject out-of-bounds moves', () => {
        const game = createGame();
        startTicTacToe(game);

        const beforeCount = getBoardState(game).moveCount;

        game.dispatchCommand('play X 5 5');
        game.dispatchCommand('play X -1 0');
        game.dispatchCommand('play X 3 3');

        expect(getBoardState(game).moveCount).toBe(beforeCount);
    });

    it('should reject moves on occupied cells', () => {
        const game = createGame();
        startTicTacToe(game);

        game.dispatchCommand('play X 1 1');
        expect(getBoardState(game).moveCount).toBe(1);

        // Try to play on the same cell
        game.dispatchCommand('play O 1 1');
        expect(getBoardState(game).moveCount).toBe(1);
    });

    it('should ignore moves after game is over', () => {
        const game = createGame();
        startTicTacToe(game);

        // X wins
        game.dispatchCommand('play X 0 0');
        game.dispatchCommand('play O 0 1');
        game.dispatchCommand('play X 1 0');
        game.dispatchCommand('play O 1 1');
        game.dispatchCommand('play X 2 0');

        expect(getBoardState(game).winner).toBe('X');
        const moveCountAfterWin = getBoardState(game).moveCount;

        // Try to play more
        game.dispatchCommand('play X 2 1');
        game.dispatchCommand('play O 2 2');

        expect(getBoardState(game).moveCount).toBe(moveCountAfterWin);
    });

    it('should detect a draw', () => {
        const game = createGame();
        startTicTacToe(game);

        // Fill board with no winner (cat's game)
        // X: (1,1), (0,2), (2,2), (1,0), (2,1)
        // O: (0,0), (2,0), (0,1), (1,2)
        game.dispatchCommand('play X 1 1');  // X
        game.dispatchCommand('play O 0 0');  // O
        game.dispatchCommand('play X 0 2');  // X
        game.dispatchCommand('play O 2 0');  // O
        game.dispatchCommand('play X 2 2');  // X
        game.dispatchCommand('play O 0 1');  // O
        game.dispatchCommand('play X 1 0');  // X
        game.dispatchCommand('play O 1 2');  // O
        game.dispatchCommand('play X 2 1');  // X (last move, draw)

        const state = getBoardState(game);
        expect(state.winner).toBe('draw');
        expect(state.moveCount).toBe(9);
    });

    it('should place parts on the board region at correct positions', () => {
        const game = createGame();
        startTicTacToe(game);

        game.dispatchCommand('play X 1 2');

        const board = game.regions.get('board');
        expect(board.value.children).toHaveLength(1);

        const piece = board.value.children[0].value;
        expect(piece.position).toEqual([1, 2]);
    });
});