import unittest
from snakes.legacy.MasterSnake import MasterSnake
from server.GameBoard import GameBoard

class TestMasterSnake(unittest.TestCase):
    def setUp(self):
        self.snake = MasterSnake()
        self.game_data = {
            "board": {
                "height": 11,
                "width": 11,
                "snakes": [
                    {
                        "id": "snake-1",
                        "body": [
                            {"x": 0, "y": 0},
                            {"x": 1, "y": 0},
                            {"x": 2, "y": 0}
                        ],
                        "head": {"x": 2, "y": 1},
                    },
                    {
                        "id": "snake-2",
                        "body": [
                            {"x": 5, "y": 4},
                            {"x": 5, "y": 3},
                            {"x": 6, "y": 3},
                            {"x": 6, "y": 2}
                        ],
                        "head": {"x": 6, "y": 3},
                    }
                ],
                "food": [
                    {
                        "x": 2,
                        "y": 0
                    },
                    {
                        "x": 10,
                        "y": 8
                    },
                    {
                        "x": 5,
                        "y": 5
                    }
                ],
            },
            "you": {
                "id": "snake-1",
                "body": [
                    {"x": 0, "y": 0},
                    {"x": 1, "y": 0},
                    {"x": 2, "y": 0}
                ],
                "head": {"x": 0, "y": 0},
            }
        }

    def test_avoid_snake_body(self):
        snakes = self.game_data['board']['snakes']
        board_width = self.game_data['board']['width']
        board_height = self.game_data['board']['height']
        safe_positions = self.snake.avoid_snake_body(snakes, board_width, board_height)
        self.assertIsInstance(safe_positions, list)
        self.assertTrue(all(isinstance(pos, dict) for pos in safe_positions))
        self.assertTrue(all('x' in pos and 'y' in pos for pos in safe_positions))

    def test_find_safe_positions(self):
        body_positions = {(0, 0), (1, 0), (2, 0), (5, 4), (5, 3), (6, 3), (6, 2)}
        safe_positions = self.snake.find_safe_positions(body_positions, 11, 11)
        self.assertNotIn({'x': 0, 'y': 0}, safe_positions)
        self.assertIn({'x': 10, 'y': 10}, safe_positions)

    def test_choose_move(self):
        board = GameBoard(
            game_id='test-game', width=11, height=11,
            ruleset={'name': 'standard', 'version': 'v1'},
            source='test', map='standard', snake_class=self.snake,
        )
        state = {**self.game_data, 'turn': 0}
        state['board'] = {**state['board'], 'hazards': []}
        board.read_game_data(state)
        move = board.snake_neat_make_a_move()
        self.assertEqual(move, 'up')
        self.assertEqual(len(self.snake.get_history()), 1)
        self.assertEqual(self.snake.get_history()[0]['turn'], 0)
        self.assertIsInstance(self.snake.get_history()[0]['data'], list)

    def test_move_towards(self):
        head = {'x': 0, 'y': 0}
        food = (5, 5)
        safe_positions = [{'x': 1, 'y': 0}, {'x': 0, 'y': 1}, {'x': 1, 'y': 1}]
        direction = self.snake.move_towards(head, food, safe_positions)
        self.assertIn(direction, ["up", "down", "left", "right"])

    def test_find_path_to_food(self):
        path = self.snake.find_path_to_food(self.game_data)
        self.assertIsInstance(path, list)
        self.assertEqual(path[-1], (5, 5))
        obstacles = {
            (part['x'], part['y'])
            for snake in self.game_data['board']['snakes']
            for part in snake['body']
        }
        previous = (0, 0)
        for position in path:
            self.assertNotIn(position, obstacles)
            self.assertEqual(abs(position[0] - previous[0]) + abs(position[1] - previous[1]), 1)
            previous = position

    def test_no_reachable_food(self):
        self.game_data['board']['food'] = []
        self.assertIsNone(self.snake.find_path_to_food(self.game_data))
        self.game_data['board']['food'] = [{'x': 1, 'y': 0}]
        self.assertIsNone(self.snake.find_path_to_food(self.game_data))

    def test_flood_fill_normalizes_coordinate_dicts(self):
        start, reachable = self.snake.flood_fill(
            {'y': 0, 'x': 0},
            [{'x': 0, 'y': 1}, {'x': 0, 'y': 2}, {'x': 4, 'y': 4}],
        )
        self.assertEqual(start, (0, 0))
        self.assertEqual(reachable, {(0, 0), (0, 1), (0, 2)})

    def test_future_move_rejects_walls_bodies_and_small_regions(self):
        snakes = [{'body': [{'x': 0, 'y': 0}, {'x': 1, 'y': 0}, {'x': 2, 'y': 0}]}]
        safe = [{'x': 0, 'y': 1}, {'x': 0, 'y': 2}, {'x': 4, 'y': 4}]
        for position in ({'x': -1, 'y': 0}, {'x': 1, 'y': 0}, {'x': 4, 'y': 4}):
            with self.subTest(position=position):
                self.assertFalse(self.snake.is_future_move_safe(position, safe, snakes))

    def test_avoid_dead_ends_prefers_connected_escape_region(self):
        head = {'x': 2, 'y': 2}
        safe = [{'x': 3, 'y': 2}, {'x': 2, 'y': 3}, {'x': 2, 'y': 4}, {'x': 2, 'y': 5}]
        snakes = [{'body': [{'x': 2, 'y': 2}, {'x': 2, 'y': 1}, {'x': 2, 'y': 0}]}]
        self.assertEqual(self.snake.avoid_dead_ends(head, 'right', safe, snakes), 'up')

    def test_find_direction(self):
        head = {'x': 0, 'y': 0}
        safe_positions = [{'x': 1, 'y': 0}, {'x': 0, 'y': 1}, {'x': 1, 'y': 1}]
        direction = self.snake.find_direction(head, safe_positions)
        self.assertIn(direction, ["up", "down", "left", "right"])

    def test_avoid_dead_ends(self):
        head = {'x': 0, 'y': 0}
        move = "right"
        snakes = self.game_data['board']['snakes']
        safe_positions = [{'x': 1, 'y': 0}, {'x': 0, 'y': 1}, {'x': 1, 'y': 1}]
        new_move = self.snake.avoid_dead_ends(head, move, safe_positions, snakes)
        self.assertEqual(new_move, 'up')

if __name__ == '__main__':
    unittest.main()