import turtle
import math
import random
import winsound


wn = turtle.Screen()
wn.bgcolor("black")
wn.title("Space Invaders")
wn.bgpic("space.gif")

turtle.register_shape("invader.gif")
turtle.register_shape("tank.gif")
turtle.register_shape("bullet.gif")

borderPen = turtle.Turtle()
borderPen.speed(0)
borderPen.penup()
borderPen.setposition(-300, -300)
borderPen.color("white")
borderPen.pendown()
borderPen.pensize(2)
for side in range(4):
    borderPen.fd(600)
    borderPen.lt(90)
borderPen.hideturtle()

score = 0
score_pen = turtle.Turtle()
score_pen.speed(0)
score_pen.color("black")
score_pen.penup()
score_pen.setposition(-425, 200)
scorestring = "Score: %s" %score
score_pen.write(scorestring, False, align="left", font=("Arial", 16, "normal"))
score_pen.hideturtle()

player = turtle.Turtle()
player.shape("tank.gif")
player.color("purple")
player.penup()
player.setposition(0, -250)
player.setheading(90)
player.speed()

playerspeed = 14

#Choose the number of enemies
numberOfEnemies = 6
#Create an empty list of enemies
enemies = []

#Add enemies to the list
for i in range(numberOfEnemies):
    enemies.append(turtle.Turtle())

for enemy in enemies:
    enemy.color("red")
    enemy.shape("invader.gif")
    enemy.penup()
    enemy.speed(0)
    x = random.randint(-200, 200)
    y = random.randint(100, 250)
    enemy.setposition(x, y)

enemyspeed = 3

bullet = turtle.Turtle()
bullet.shape("bullet.gif")
bullet.color("pink")
bullet.penup()
bullet.speed()
bullet.shapesize(0.5)
bullet.hideturtle()

bulletspeed = 20

bulletstate = "ready"

def moveLeft():
    x = player.xcor()
    x -= playerspeed
    if x < - 280:
        x = - 280
    player.setx(x)

def moveRight():
    x = player.xcor()
    x += playerspeed
    if x > 280:
        x = 280
    player.setx(x)

def moveUp():
    y = player.ycor()
    y += playerspeed
    player.sety(y)

def fireBullet():
    global bulletstate
    if bulletstate == "ready":
        winsound.PlaySound('laser.wav', winsound.SND_ASYNC)
        bulletstate = "fire"
        x = player.xcor()
        y = player.ycor()
        bullet.setposition(x, y)
        bullet.showturtle()

def isCollision(t1, t2):
    distance = math.sqrt(math.pow(t1.xcor()-t2.xcor(), 2) + math.pow(t1.ycor()-t2.ycor(), 2))
    if distance < 15:
        return True
    else:
        return False

boss_speed = 9

class Bosses(turtle.Turtle):
        def __init__(self, spriteshape, color, startx, starty):
                turtle.Turtle.__init__(self, shape = spriteshape)
                self.speed(0)
                self.penup()
                self.color(color)
                self.goto(startx, starty)

        def move(self):
                global boss_speed

                x = self.xcor()
                x += boss_speed
                self.setx(x)
                if self.xcor() > 280:
                        y = self.ycor()
                        y -= 50
                        self.sety(y)
                        boss_speed *= -1
                if self.xcor() < -280:
                        y = self.ycor()
                        y -= 50
                        self.sety(y)
                        boss_speed *= -1


boss = Bosses("circle", "blue", 250, 250)
boss.hideturtle()

turtle.listen()
turtle.onkey(moveLeft, "Left")
turtle.onkey(moveUp, "Up")
turtle.onkey(moveRight, "Right")
turtle.onkey(fireBullet, "space")

while True:
    for enemy in enemies:
        x = enemy.xcor()
        x += enemyspeed
        enemy.setx(x)
        if enemy.xcor() > 280:
            for e in enemies:
                y = e.ycor()
                y -= 40
                e.sety(y)
            enemyspeed *= -1
        if enemy.xcor() < -280:
            for e in enemies:
                y = e.ycor()
                y -= 40
                e.sety(y)
            enemyspeed *= -1
        if enemy.ycor() < -280:
            for enemy in enemies:
                enemy.hideturtle()
            player.hideturtle()
            gameover = turtle.Screen()
            gameover.bgpic('gameover.gif')
            bulletstate = "fire"
            winsound.PlaySound('hyenalaugh.wav', winsound.SND_ASYNC)
            break

        if isCollision(bullet, enemy):
            bullet.hideturtle()
            bulletstate = "ready"
            bullet.setposition(0, -400)
            x = random.randint(-200, 200)
            y = random.randint(100, 250)
            enemy.setposition(x, y)
            score += 10
            scorestring = "Score: %s" %score
            score_pen.clear()
            score_pen.write(scorestring, False, align="left", font=("Arial", 16, "normal"))
            winsound.PlaySound('bomb_cut.wav', winsound.SND_ASYNC)

        if isCollision(player, enemy):
            for enemy in enemies:
                enemy.hideturtle()
            player.hideturtle()
            gameover = turtle.Screen()
            gameover.bgpic('gameover.gif')
            bulletstate = "fire"
            winsound.PlaySound('hyenalaugh.wav', winsound.SND_ASYNC)
            break

    if score >= 20:
        boss.move()


    if bulletstate == "fire":
        y = bullet.ycor()
        y += bulletspeed
        bullet.sety(y)

    if bullet.ycor() > 275:
        bullet.hideturtle()
        bulletstate = "ready"