#!/usr/bin/python3

import sys
from sprite_stacking_engine.settings import *
from sprite_stacking_engine.cache import Cache
from sprite_stacking_engine.player import Player
from sprite_stacking_engine.scene import Scene


class Engine:
    def __init__(self, app):
        self.app = app
        self.surface = pygame.Surface(self.app.screen.get_size())  # surface to draw the sprites on
        # groups
        self.main_group = pygame.sprite.LayeredUpdates()
        # game objects
        self.cache = Cache()
        self.player = Player(self)
        self.scene = Scene(self)

    def update(self):
        self.main_group.update()

    def draw(self):
        self.surface.fill(BG_COLOR)
        self.main_group.draw(self.surface)

    def check_events(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT or (event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE):
                pygame.quit()
                sys.exit()

    def tick(self):
        self.check_events()
        self.update()
        self.draw()