import pygame, sys
import time
from bullet import Bullet
from enemy import Enemy

def events(gun, screen, bullets):
  for event in pygame.event.get():
    if event.type == pygame.QUIT:
      sys.exit()
    elif event.type == pygame.KEYDOWN:
      if event.key == pygame.K_RIGHT:
        gun.mright = True
      elif event.key == pygame.K_LEFT:
        gun.mleft = True
      elif event.key == pygame.K_SPACE:
        new_bullet = Bullet(screen, gun)
        bullets.add(new_bullet)
    elif event.type == pygame.KEYUP:
      if event.key == pygame.K_RIGHT:
        gun.mright = False
      elif event.key == pygame.K_LEFT:
        gun.mleft = False


def update(bg_color, screen, gun, enemies, bullets, stats, scores):
  screen.fill(bg_color)
  gun.output()
  enemies.draw(screen)
  scores.score_output()
  for bullet in bullets.sprites():
    bullet.draw_bullet()
  pygame.display.flip()
  
def update_bullets(bullets, enemies, screen, stats, scores):
  bullets.update()
  for bullet in bullets.copy():
    if bullet.rect.bottom <= 0:
      bullets.remove(bullet)
  collisions=pygame.sprite.groupcollide(bullets, enemies, True, True)
  if collisions:
    for enemies in collisions.values():
        stats.score += 10 * len(enemies)
  scores.image_score()
  high_score_check(stats, scores)
  scores.image_guns()
  if len(enemies)==0:
    bullets.empty()
    create_army(screen, enemies)
  
         
  

def create_army(screen, enemies):
  enemy = Enemy(screen)
  enemy_width = enemy.rect.width
  enemy_height = enemy.rect.height
  number_enemy_y = int((500 - 100 - 2 * enemy_height)/ enemy_height)  
  number_enemy_x = int((500 -2 * enemy_width)/ enemy_width)
  
  for j in range (number_enemy_y):
    for i in range(number_enemy_x):
      enemy = Enemy(screen)
      enemy.rect.x = enemy_width + enemy_width * i
      enemy.y = enemy_height + enemy_height * j
      enemy.rect.y = enemy.y
      enemies.add(enemy)

      
  
def update_enemies(stats,screen, gun, enemies, bullets, scores):
  enemies.update()
  if pygame.sprite.spritecollideany(gun, enemies):
    gun_kill(stats,screen, gun, enemies, bullets, scores)
  enemies_check(stats,screen, gun, enemies, bullets, scores)
   
      
    

def gun_kill(stats,screen, gun, enemies, bullets, scores):
  if stats.guns_left>0:
    stats.guns_left -= 1
    scores.image_guns()
    enemies.empty()
    bullets.empty()
    create_army(screen, enemies)
    gun.create_gun()
    time.sleep(2)
  else:
    stats.run_game==False
    sys.exit()
    

def enemies_check(stats,screen, gun, enemies, bullets, scores):
  screen_rect = screen.get_rect()
  for enemy in enemies.sprites():
    if enemy.rect.bottom >= screen_rect.bottom:
      gun_kill(stats,screen, gun, enemies, bullets, scores)
      break

def high_score_check(stats, scores):
  if stats.score >= stats.high_score:
    stats.high_score = stats.score
    scores.image_high_score()
    with open("highscores.txt", "w") as f:
      f.write(str(stats.high_score))