import curses
import random
import time
from curses import textpad
import maze.menu
import maze.modules.maze as m

OPPOSITE_DIRECTION_DICT = {
    curses.KEY_UP: curses.KEY_DOWN,
    curses.KEY_DOWN: curses.KEY_UP,
    curses.KEY_RIGHT: curses.KEY_LEFT,
    curses.KEY_LEFT: curses.KEY_RIGHT,
}

DIRECTIONS_LIST = [curses.KEY_RIGHT, curses.KEY_LEFT, curses.KEY_DOWN, curses.KEY_UP]


def create_food(snake, box):
    """Simple function to find coordinates of food which is inside box and not on snake body"""
    food = None
    while food is None:
        food = [
            random.randint(box[0][0] + 1, box[1][0] - 1),
            random.randint(box[0][1] + 1, box[1][1] - 1),
        ]
        if food in snake:
            food = None
    return food


def main(stdscr):
    # initial settings
    curses.curs_set(0)
    stdscr.nodelay(1)
    stdscr.timeout(100)
    stdscr.clear()
    stdscr.refresh()
    # create a game box
    sh, sw = stdscr.getmaxyx()
    box = [[3, 3], [sh - 3, sw - 3]]  # [[ul_y, ul_x], [dr_y, dr_x]]
    textpad.rectangle(stdscr, box[0][0], box[0][1], box[1][0], box[1][1])

    # create snake and set initial direction
    snake = [[sh // 2, sw // 2 + 1], [sh // 2, sw // 2], [sh // 2, sw // 2 - 1]]
    direction = curses.KEY_RIGHT

    # draw snake
    for y, x in snake:
        stdscr.addstr(y, x, "#")

    # create food
    food = create_food(snake, box)
    stdscr.addstr(food[0], food[1], "*")

    # print score
    score = 0
    score_text = "Score: {}".format(score)
    stdscr.addstr(1, sw // 2 - len(score_text) // 2, score_text)

    while 1:
        # non-blocking input
        key = stdscr.getch()

        if key == 27:
            stdscr.clear()
            stdscr.refresh()
            time.sleep(1)
            maze.menu.menu(stdscr)
            return
        # set direction if user pressed any arrow key and that key is not opposite of current direction
        if key in DIRECTIONS_LIST and key != OPPOSITE_DIRECTION_DICT[direction]:
            direction = key

        # find next position of snake head
        head = snake[0]
        if direction == curses.KEY_RIGHT:
            new_head = [head[0], head[1] + 1]
        elif direction == curses.KEY_LEFT:
            new_head = [head[0], head[1] - 1]
        elif direction == curses.KEY_DOWN:
            new_head = [head[0] + 1, head[1]]
        elif direction == curses.KEY_UP:
            new_head = [head[0] - 1, head[1]]

        # insert and print new head
        stdscr.addstr(new_head[0], new_head[1], "#")
        snake.insert(0, new_head)

        # if sanke head is on food
        if snake[0] == food:
            # update score
            score += 1
            score_text = "Score: {}".format(score)
            stdscr.addstr(1, sw // 2 - len(score_text) // 2, score_text)

            # create new food
            food = create_food(snake, box)
            stdscr.addstr(food[0], food[1], "*")

            # increase speed of game
            stdscr.timeout(100 - (len(snake) // 3) % 90)
        else:
            # shift snake's tail
            stdscr.addstr(snake[-1][0], snake[-1][1], " ")
            snake.pop()

        # conditions for game over
        if (
            snake[0][0] in [box[0][0], box[1][0]]
            or snake[0][1] in [box[0][1], box[1][1]]
            or snake[0] in snake[1:]
        ):
            msg = "Game Over!"
            stdscr.addstr(sh // 2, sw // 2 - len(msg) // 2, msg)
            while stdscr.getch() == -1:
                pass
            time.sleep(2)
            m.play(stdscr, executeguest=True, outerscore=score)
            #Call play with guestcheck to update scores
            stdscr.clear()
            stdscr.refresh()
            maze.menu.menu(stdscr)
            return score