import pytest
import main 

#########
#  In order to reduce the dependency of method shifting(),
#  the position is not explicitly checked.    
#########

@pytest.fixture(autouse=True)
def patch_log(monkeypatch):
    monkeypatch.setattr(main, "log", lambda msg: None)
    monkeypatch.setattr(main, "logvv", lambda msg: None)

def test_single_item_no_match():

    matrixdims = (6, 3)

    pos = (0,0)
    before = {1:pos}
  
    after = main.make_pos_free((2, 3), before, matrixdims)
    assert after[1] == pos


def test_single_item_match_at_0_0():

    pos = (0,0)
    before = {1:pos}

    matrixdims = (6, 3)
    after = main.make_pos_free(pos, before, matrixdims)
    assert after[1] != pos


def test_single_item_match_at_horizont():

    pos = (0, 1)
    before = {1:pos}

    # Y
    # 0
    # 1 <--- Horizon
    # 2
    matrixdims = (99, 2)
    after = main.make_pos_free(pos, before, matrixdims)
    assert after[1] != pos


def test_single_item_match_at_upper():

    pos = (0, 0)
    before = {1:pos}

    # Y
    # 0
    # 1 <--- Horizon
    # 2
    matrixdims = (99, 2)
    after = main.make_pos_free(pos, before, matrixdims)
    assert after[1] != pos


def test_single_item_match_at_lower():

    pos = (0, 2)
    before = {1:pos}

    # Y
    # 0                       ^
    # 1 <--- Horizon | Lower  | Upper
    # 2              V
    matrixdims = (99, 2)
    after = main.make_pos_free(pos, before, matrixdims)
    assert after[1] != pos


def test_first_item():

    pos = (1,1)
    matrixdims = (6, 3)

    before = []
    after = main.make_pos_free(pos, before, matrixdims)
    assert len(after) == 0


def test_check_direct_neighbours_upwards():

    matrixdims = (1000, 1000)

    pos = (100,200)

    before = {
        1:(pos[main.P.X]  , pos[main.P.Y]   ),
        2:(pos[main.P.X]  , pos[main.P.Y]-1 ),
              }

    after = main.make_pos_free(pos, before, matrixdims)

    for i in after:
        for j in after:
            if i == j:
                continue
            assert after[j] != after[i], f"i={i}, j={j}: Two items may not have the same position: {after[i]}"


def test_multiple_item_no_match():

    matrixdims = (6, 3)

    pos = (1,1)

    before = {
        1:(pos[main.P.X]+1, pos[main.P.Y]  ),
        2:(pos[main.P.X]-1, pos[main.P.Y]  ),
        3:(pos[main.P.X]  , pos[main.P.Y]+1),
        4:(pos[main.P.X]  , pos[main.P.Y]-1),
        5:(pos[main.P.X]+1, pos[main.P.Y]+1),
        6:(pos[main.P.X]+1, pos[main.P.Y]-1),
        7:(pos[main.P.X]-1, pos[main.P.Y]+1),
        8:(pos[main.P.X]-1, pos[main.P.Y]-1),
              }

    after = main.make_pos_free(pos, before, matrixdims)

    for i in after:
        for j in after:
            if i == j:
                continue
            assert after[j] != after[i], f"i={i}, j={j}: Two items may not have the same position: {after[i]}"