"""IB111 cv06 first task.

The task learns how to use assert statement.
"""


def parameter_check(start_position,
                    end_position,
                    dimension):
    """Type and logic check of parameters.

    TASK 1 / IMPLEMENT THE FUNCTION parameter_check().
    use 'assert' to check parameters
    pass the tests in the script assertion_tester.py

    checks if the given move is a valid for a chess knight
    board is indexed by zero indexing
    the function has to check all the possible incorrect inputs
        - non-valid move
        - non-integer coordinates
        - type mismatch
        - ...

    any problem is reported by an AssertionError

    :param start_position: start of the move, coordinates, tuple (x, y)
    :param end_position: end of the move, coordinates, tuple (x, y)
    :param dimension: dimension of a desk, tuple (x, y)
    :return:
    """
    pass  # REPLACE BY YOUR CODE


def move_knight(start_position,
                end_position,
                dimension):
    """Move knight to the new position.

    DO NOT CHANGE THIS CODE,
    :param start_position: start of the move, coordinates, tuple (x, y)
    :param end_position: end of the move, coordinates, tuple (x, y)
    :param dimension: dimension of a desk, tuple (x, y)
    :return: np array
    """
    # checks if the parameters are correctly set
    parameter_check(start_position, end_position, dimension)

    # create desk
    x, y = dimension
    board = [[0 for _ in range(y)] for _ in range(x)]

    # unfold coordinates
    x0, y0 = start_position
    x1, y1 = end_position

    # write the old and the new knight position to the desk
    board[x0][y0] = 1
    board[x1][y1] = 2

    return board