# SNAKES GAME
# Use ARROW KEYS to play, SPACE BAR for pausing/resuming and Esc Key for exiting
# Original Author : Sanchit Gangwar
# Modified by : Rayan Dutta
# Minor changes made to keep the game working.

try:
    import curses
    from time import sleep
    from curses import KEY_RIGHT, KEY_LEFT, KEY_UP, KEY_DOWN
    from random import randint

    print('Use the arrow keys to move, press the space bar to pause, and press ESC to quit')
    sleep(1)
    key = KEY_RIGHT  # Initializing values
    curses.initscr()
    win = curses.newwin(20, 60, 0, 0)
    win.keypad(1)
    curses.noecho()
    curses.curs_set(0)
    win.border(0)
    win.nodelay(1)
    x,y=win.getmaxyx()
    key = KEY_DOWN  # Initializing values
    score = 0
    s = open('.snake_highscore.txt', 'r')
    hscore = s.read()
    s.close()
    snake = [[4, 10], [4, 9], [4, 8]]  # Initial snake co-ordinates
    food = [10, 20]  # First food co-ordinates

    win.addch(food[0], food[1], '*')  # Prints or shows the food

    while key != 27:  # While Esc key is not pressed
        win.border(0)
        win.addstr(0, 2, 'Score : ' + str(score) + ' ')  # Printing 'Score' and
        win.addstr(0, 27, ' SNAKE ')  # 'SNAKE' strings
        win.addstr(0, 37, 'Highscore: ' + str(hscore) + ' ')

        win.timeout(
            int(150 - (len(snake) / 5 + len(snake) / 10) % 120))  # Increases the speed of Snake as its length increases

        prevKey = key  # Previous key pressed
        event = win.getch()
        key = key if event == -1 else event

        if key == ord(' '):  # If SPACE BAR is pressed, wait for another
            key = -1  # one (Pause/Resume)
            win.addstr(0, 40, 'PAUSED')
            while key != ord(' '):
                key = win.getch()
            key = prevKey
            continue

        if key not in [KEY_LEFT, KEY_RIGHT, KEY_UP, KEY_DOWN, 27]:  # If an invalid key is pressed
            key = prevKey

        # Calculates the new coordinates of the head of the snake. NOTE: len(snake) increases.
        # This is taken care of later at [1].
        snake.insert(0, [snake[0][0] + (key == KEY_DOWN and 1) + (key == KEY_UP and -1),
                         snake[0][1] + (key == KEY_LEFT and -1) + (key == KEY_RIGHT and 1)])

        # If snake crosses the boundaries, make it enter from the other side
        if snake[0][0] == 0: snake[0][0] = 18
        if snake[0][1] == 0: snake[0][1] = 58
        if snake[0][0] == 19: snake[0][0] = 1
        if snake[0][1] == 59: snake[0][1] = 1

        # Exit if snake crosses the boundaries (Uncomment to enable)
        # if snake[0][0] == 0 or snake[0][0] == 19 or snake[0][1] == 0 or snake[0][1] == 59: break

        # If snake runs over itself
        if snake[0] in snake[1:]:
            break;

        if snake[0] == food:  # When snake eats the food
            food = []
            score += 1
            while food == []:
                food = [randint(1, 18), randint(1, 58)]  # Calculating next food's coordinates
                if food in snake: food = []
            win.addch(food[0], food[1], '*')
        else:
            last = snake.pop()  # [1] If it does not eat the food, length decreases
            win.addch(last[0], last[1], ' ')
        win.addch(snake[0][0], snake[0][1], '#')

    
except KeyboardInterrupt or EOFError:
    curses.endwin()
    print( "Score - " + str(score))
    if score > int(hscore):
        s = open('.snake_highscore.txt', 'w')
        s.write(str(score))
        s.close()

curses.endwin()
if score > int(hscore):
    s = open('.snake_highscore.txt', 'w')
    s.write(str(score))
    s.close()
print("Score - " + str(score))