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# 导入库
import pgzrun
import random

# 宽高
WIDTH = 450
HEIGHT = 650
# 分数
score = 0
# 游戏模式
game_state = "start"
# 是否发喵弹
shoot = False
# 速度
t = 5
# 等级
game_integral = 0
# 血量
life = 1


# 创建角色
ship = Actor("ship")
alien = Actor("alien")
bullet = Actor("bullet")

# 角色坐标
ship.pos = WIDTH // 2, HEIGHT - 60
alien.pos = WIDTH // 2, 50

# 飞船及外星人控制


def update():
    global game_state, shoot, score, t, game_integral, life, count

    if game_state == "play":
        if keyboard.a:
            ship.x -= t
        elif keyboard.d:
            ship.x += t
        elif ship.x >= WIDTH - 30:
            ship.x = WIDTH - 30
        elif ship.x <= 20:
            ship.x = 20
        alien.y += t
        if keyboard.w:
            shoot = True
            sounds.bullet.play()
            initpos = ship.x, ship.y - 60
            bullet.pos = initpos[0], initpos[1]
        if shoot:
            if bullet.y > -20:
                bullet.y -= 10
            else:
                shoot = False
                bullet.x = -160
            if alien.collidepoint(bullet.pos):
                alien_place(alien)
                score += 10

        if alien.collidepoint(ship.pos):
            life -= 1
        if alien.y >= HEIGHT:
            alien_place(alien)

        if score == 1000:
            game_integral = 1
        elif score == 2000:
            game_integral = 2
        elif score == 3000:
            game_integral = 3
        elif score == 4000:
            game_integral = 4
        elif score == 5000:
            game_integral = 5
        if life == 0:
            game_state = "game_over"


# 位置


def alien_place(obj):
    obj.x = random.randint(0 + 20, WIDTH - 20)
    obj.y = random.randint(0 - 50, HEIGHT // 2)

# 显示角色


def draw():
    global game_state, life, diamond, heart
    if game_state == "start":
        screen.fill("sky blue")
        screen.draw.text("Alien is coming!!!", (WIDTH // 2 -
                                                175, HEIGHT // 2 - 80), fontsize=60)
        screen.draw.text("Press SPACE to start!",
                         (WIDTH // 2 - 165, HEIGHT // 2), fontsize=40)
        if keyboard.space:
            game_state = "play"

    elif game_state == "play":
        screen.fill("sky blue")
        screen.draw.text("score:" + str(score), (10, 10), fontsize=30)
        screen.draw.text("YOU GRADE:" + str(game_integral),
                         (WIDTH // 2 - 100, 10), fontsize=30)
        screen.draw.text("life:" + str(life),
                         (WIDTH - 60, 10), fontsize=30)
        sounds.bg_music.play()
        ship.draw()
        alien.draw()
        bullet.draw()

    elif game_state == "game_over":
        screen.fill("sky blue")
        screen.draw.text("GAME OVER", (WIDTH // 2 - 145,
                                       HEIGHT // 2 - 80), fontsize=60)
        screen.draw.text("YOUR SCORE:" + str(score),
                         (WIDTH // 2 - 130, HEIGHT // 2 - 10), fontsize=30)
        screen.draw.text("YOU GRADE:" + str(game_integral),
                         (WIDTH // 2 - 125, HEIGHT // 2 + 40), fontsize=30)

    elif game_state == "win":
        screen.fill("sky blue")
        screen.draw.text("YOU WIN!!!", (WIDTH // 2 - 170,
                                        HEIGHT // 2 - 80), fontsize=60)
        screen.draw.text("YOUR SCORE:" + str(score),
                         (WIDTH // 2 - 170, HEIGHT // 2), fontsize=40)
        screen.draw.text("YOU GRADE:" + str(game_integral),
                         (WIDTH // 2 - 170, HEIGHT // 2 - 60), fontsize=30)


# 使代码正常运行
pgzrun.go()