import pygame


class Bullet(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        
        self.bullet_up = pygame.image.load(r"./image/bullet_up.png")
        self.bullet_down = pygame.image.load(r"./image/bullet_down.png")
        self.bullet_left = pygame.image.load(r"./image/bullet_left.png")
        self.bullet_right = pygame.image.load(r"./image/bullet_right.png")

        self.dir_x, self.dir_y = 0, 0
        self.speed  = 6
        self.life   = False
        self.strong = False

        self.bullet = self.bullet_up
        self.rect = self.bullet.get_rect()
        self.rect.left, self.rect.right = 3 + 12 * 24, 3 + 24 * 24


    """
    根据坦克的移动方向来选择子弹图像
    例如：dir_x 为0且 dir_y 为-1，说明坦克向上移动，将子弹图像设置为向上的子弹图像
    调用这个方法，可以根据坦克的移动方向来改变子弹的图像。这样在游戏中，子弹的图像会随着坦克的移动而改变
    """
    def changeImage(self, dir_x, dir_y):
        self.dir_x, self.dir_y = dir_x, dir_y
        # 子弹向上的图像
        if self.dir_x == 0 and self.dir_y == -1:
            self.bullet = self.bullet_up
        # 子弹向下的图像
        elif self.dir_x == 0 and self.dir_y == 1:
            self.bullet = self.bullet_down
        # 子弹向左的图像
        elif self.dir_x == -1 and self.dir_y == 0:
            self.bullet = self.bullet_left
        # 子弹向右的图像
        elif self.dir_x == 1 and self.dir_y == 0:
            self.bullet = self.bullet_right
        

    
    def move(self):
        self.rect = self.rect.move(self.speed * self.dir_x,
                                   self.speed * self.dir_y)

        if self.rect.top < 3:
            self.life = False
        #    self.rect.left, self.rect.right = 3 + 12 * 24, 3 + 24 * 24
        if self.rect.bottom > 630 - 3:
            self.life = False
        #    self.rect.left, self.rect.right = 3 + 12 * 24, 3 + 24 * 24
        if self.rect.left < 3:
            self.life = False
        #    self.rect.left, self.rect.right = 3 + 12 * 24, 3 + 24 * 24
        if self.rect.right > 630 - 3:
            self.life = False
        #    self.rect.left, self.rect.right = 3 + 12 * 24, 3 + 24 * 24
        #
        # if pygame.sprite.spritecollide(self, brickGroup, True, None):
        #    self.life = False
        #    moving = 0
        # if self.strong:
        #    if pygame.sprite.spritecollide(self, ironGroup, True, None):
        #        self.life = False
        # else:
        #    if pygame.sprite.spritecollide(self, ironGroup, False, None):
        #        self.life = False
        #    moving = 0
        # return moving
        #