import pytest
import sys
import os

from source.models.base import Cell

class TestCellCreation:
    """Тесты создания клетки и начальных значений."""

    def test_coordinates_are_set(self):
        cell = Cell(3, 7)
        assert cell.x == 3
        assert cell.y == 7

    def test_default_flags_are_false(self):
        cell = Cell(0, 0)
        assert cell.is_wall  is False
        assert cell.is_start is False
        assert cell.is_exit  is False

    def test_create_wall(self):
        cell = Cell(0, 0, is_wall=True)
        assert cell.is_wall is True

    def test_create_start(self):
        cell = Cell(0, 0, is_start=True)
        assert cell.is_start is True

    def test_create_exit(self):
        cell = Cell(0, 0, is_exit=True)
        assert cell.is_exit is True


class TestCellIsPassable:
    """Тесты метода is_possible."""

    def test_empty_cell_is_passable(self):
        cell = Cell(0, 0)
        assert cell.is_possible() is True

    def test_wall_is_not_passable(self):
        cell = Cell(0, 0, is_wall=True)
        assert cell.is_possible() is False

    def test_start_cell_is_passable(self):
        cell = Cell(0, 0, is_start=True)
        assert cell.is_possible() is True

    def test_exit_cell_is_passable(self):
        cell = Cell(0, 0, is_exit=True)
        assert cell.is_possible() is True


class TestCellFlagsAreMutuallyExclusive:
    """Тесты взаимного исключения флагов."""

    def test_set_wall_clears_start(self):
        cell = Cell(0, 0, is_start=True)
        cell.is_wall = True
        assert cell.is_start is False
        assert cell.is_wall  is True

    def test_set_wall_clears_exit(self):
        cell = Cell(0, 0, is_exit=True)
        cell.is_wall = True
        assert cell.is_exit is False
        assert cell.is_wall is True

    def test_set_start_clears_wall(self):
        cell = Cell(0, 0, is_wall=True)
        cell.is_start = True
        assert cell.is_wall  is False
        assert cell.is_start is True

    def test_set_start_clears_exit(self):
        cell = Cell(0, 0, is_exit=True)
        cell.is_start = True
        assert cell.is_exit  is False
        assert cell.is_start is True

    def test_set_exit_clears_wall(self):
        cell = Cell(0, 0, is_wall=True)
        cell.is_exit = True
        assert cell.is_wall is False
        assert cell.is_exit is True

    def test_set_exit_clears_start(self):
        cell = Cell(0, 0, is_start=True)
        cell.is_exit = True
        assert cell.is_start is False
        assert cell.is_exit  is True

    def test_unset_wall_does_not_clear_others(self):
        # снятие флага (False) не должно трогать остальные
        cell = Cell(0, 0, is_wall=True)
        cell.is_wall = False
        assert cell.is_start is False
        assert cell.is_exit  is False


class TestCellStr:
    """Тесты строкового представления клетки."""

    def test_str_returns_string(self):
        cell = Cell(0, 0)
        assert isinstance(str(cell), str)

    def test_repr_contains_coordinates(self):
        cell = Cell(4, 9)
        assert "4" in repr(cell)
        assert "9" in repr(cell)