# Space Invaders
# Python 3.8 Windows
import turtle
import os

# Set up the screen
wn = turtle.Screen()
wn.bgcolor("black")
wn.title("Space Invaders")

# Draw border
border_pen = turtle.Turtle()
border_pen.speed(0)
border_pen.color("white")
border_pen.penup()
border_pen.setposition(-300, -300)
border_pen.pendown()
border_pen.pensize(3)
for side in range(4):
    border_pen.fd(600)
    border_pen.lt(90)
border_pen.hideturtle()

# Create the player turtle
player = turtle.Turtle()
player.color("blue")
player.shape("triangle")
player.penup()
player.speed(0)
player.setposition(0,-250)
player.setheading(90)

playerspeed = 15

# Create the enemy
enemy = turtle.Turtle()
enemy.color("red")
enemy.shape("circle")
enemy.penup()
enemy.speed(0)
enemy.setposition(-200,250)

enemyspeed = 2

# Create the player's bullet
bullet = turtle.Turtle()
bullet.color("yellow")
bullet.shape("triangle")
bullet.penup()
bullet.speed(0)
bullet.setheading(90)
bullet.shapesize(0.5,0.5)
bullet.hideturtle()

bulletspeed = 20

# Define bullet state
# ready - ready to fire
# fire - bullet is firing
bulletstate = "ready"






# Main game loop
while True:

    # Move the enemy
    x = enemy.xcor()
    x += enemyspeed
    enemy.setx(x)

    # Move the enemy back and down
    if enemy.xcor() > 280:
        y = enemy.ycor()
        y -= 40
        enemyspeed*= -1
        enemy.sety(y)

    if enemy.xcor() < -280:
        y = enemy.ycor()
        y -= 40
        enemyspeed*= -1
        enemy.sety(y)




# Move the player left and right
def move_left():
        x = player.xcor()
        x -= playerspeed
        if x < -280:
            x = -280
        player.setx(x)

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

def fire_bullet():
    # Declare bulletstate as a global if it needs changed
    global bulletstate

    # Move the bullet to just above the player
    x = player.xcor()
    y = player.ycor() +10
    bullet.setposition(x, y)
    bullet.showturtle()


# Create keyboard bindings
turtle.listen()
turtle.onkeypress(move_left, "Left")
turtle.onkeypress(move_right, "Right")
turtle.onkeypress(fire_bullet, "space")

wn.mainloop()