import pygame
import os
from pathlib import Path
import pocket_friends
import importlib

valid_surfaces = [
    'title',
    'egg_select'
]
surface_modules = {}

for module in valid_surfaces:
    surface_modules[module] = importlib.import_module('pocket_friends.game_files.surfaces.{0}'.format(module))
    print('imported ' + module)

# FPS for the entire game to run at.
game_fps = 16
# The resolution the game is rendered at.
game_res = 80
script_dir = os.path.dirname(os.path.abspath(__file__))
save_dir = os.path.join(Path.home(), '.pocket_friends')
resources_dir = script_dir + '/surfaces/resources'
starting_surface = 'title'


# Gets the directory of the script for importing and the save directory


def game():
    """
    Starts the game.
    """
    pygame.init()

    # The game is normally rendered at 80 pixels and upscaled from there. If changing displays, change the
    # screen_size to reflect what the resolution of the new display is.
    screen_size = 320

    pygame.mouse.set_visible(False)
    pygame.display.set_caption('Pocket Friends {0}'.format(pocket_friends.__version__))
    window = pygame.display.set_mode((screen_size, screen_size))
    surface = surface_modules.get(starting_surface).Surface((game_res, game_res), resources_dir, game_fps)

    # Add an icon to the pygame window.
    icon = pygame.image.load(script_dir + '/icon/icon.png').convert_alpha()
    pygame.display.set_icon(icon)

    # Default game state when the game first starts.
    running = True

    # A group of all the sprites on screen. Used to update all sprites at onc
    all_sprites = pygame.sprite.Group()

    # Time since last input. Used to help regulate double presses of buttons.
    last_input_tick = 0

    while running:
        surface.update()
        frame = pygame.transform.scale(surface, (screen_size, screen_size))
        window.blit(frame, frame.get_rect())

        if not surface.running:
            next_surface = surface.next_surface
            if next_surface not in valid_surfaces:
                raise Exception('Given surface is not listed in valid surfaces!')
            surface = surface_modules.get(next_surface).Surface((game_res, game_res), resources_dir, game_fps)
            print(surface.name)
        pygame.display.flip()


def main():
    """
    Calls the game() function to start the game.
    """
    game()

    pygame.quit()