import pygame
import math
pygame.init()

def degrees_to_radians(degrees):
    return degrees * (math.pi / 180.0)

class Projectile(pygame.sprite.Sprite):
    def __init__(self, boss, ddx, ddy):
        self.shotsound = pygame.mixer.Sound('src/sound/weapons/rifle.ogg')
        pygame.sprite.Sprite.__init__(self)

        self.load_image = pygame.image.load("src/images/projectile.png")
        """Owner of the shot"""
        self.boss = boss
        clock = pygame.time.Clock()
        self.bulletspeed = 20.0 # pixel per second ?
        self.ddx = ddx
        self.ddy = ddy
        self.pos = [0,0]

        self.rect = self.load_image.get_rect()
        self.lifetime = 5 # 5 seconds
        self.angle = self.boss.angle_to_pointer

        self.pos[0] = self.boss.rect.centerx
        self.pos[1] = self.boss.rect.centery
        self.calculate_origin()
        self.image = pygame.transform.rotate(self.load_image, self.angle)

        self.startlength = 0
        self.maxlength = 5
        self.dx = self.ddx * self.bulletspeed
        self.dy = self.ddy * self.bulletspeed

    def calculate_origin(self):
        # - spawn bullet at end of turret barrel instead tank center -
        # cannon is around Tank.side long, calculatet from Tank center
        # later subtracted 20 pixel from this distance
        # so that bullet spawns closer to tank muzzle
        self.pos[0] +=  math.cos(degrees_to_radians(self.boss.angle_to_pointer)) * (self.boss.rect.width-20)
        self.pos[1] +=  math.sin(degrees_to_radians(-self.boss.angle_to_pointer)) * (self.boss.rect.width-20)


    def update(self, block_group):
        self.block_group = block_group
        self.pos[0] += self.dx * 0.2 #0.016
        self.pos[1] += self.dy * 0.2 #0.016

        self.rect.centerx = round(self.pos[0],0)
        self.rect.centery = round(self.pos[1],0)
        self.image = pygame.transform.rotate(self.load_image, self.angle)
        if self.rect.x >= 720:
            self.kill()
        elif self.rect.x <= 0:
            self.kill()
        elif self.rect.y >= 560:
            self.kill()
        elif self.rect.y <= 0:
            self.kill()

        if pygame.sprite.spritecollide(self, self.block_group, False):
           self.kill()