"""
Sprite Bullets

Simple program to show basic sprite usage.

Artwork from http://kenney.nl

If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.sprite_bullets_aimed
"""

import random
import arcade
import math
import os

SPRITE_SCALING_PLAYER = 0.5
SPRITE_SCALING_COIN = 0.2
SPRITE_SCALING_LASER = 0.8
COIN_COUNT = 50

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Sprites and Bullets Aimed Example"

BULLET_SPEED = 5

window = None


class MyGame(arcade.Window):
    """ Main application class. """

    def __init__(self):
        """ Initializer """
        # Call the parent class initializer
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)

        # Set the working directory (where we expect to find files) to the same
        # directory this .py file is in. You can leave this out of your own
        # code, but it is needed to easily run the examples using "python -m"
        # as mentioned at the top of this program.
        file_path = os.path.dirname(os.path.abspath(__file__))
        os.chdir(file_path)

        # Variables that will hold sprite lists
        self.player_list = None
        self.coin_list = None
        self.bullet_list = None

        # Set up the player info
        self.player_sprite = None
        self.score = 0
        self.score_text = None

        # Load sounds. Sounds from kenney.nl
        self.gun_sound = arcade.sound.load_sound("sounds/laser1.wav")
        self.hit_sound = arcade.sound.load_sound("sounds/phaseJump1.wav")

        arcade.set_background_color(arcade.color.AMAZON)

    def setup(self):

        """ Set up the game and initialize the variables. """

        # Sprite lists
        self.player_list = arcade.SpriteList()
        self.coin_list = arcade.SpriteList()
        self.bullet_list = arcade.SpriteList()

        # Set up the player
        self.score = 0

        # Image from kenney.nl
        self.player_sprite = arcade.Sprite("images/character.png", SPRITE_SCALING_PLAYER)
        self.player_sprite.center_x = 50
        self.player_sprite.center_y = 70
        self.player_list.append(self.player_sprite)

        # Create the coins
        for i in range(COIN_COUNT):

            # Create the coin instance
            # Coin image from kenney.nl
            coin = arcade.Sprite("images/coin_01.png", SPRITE_SCALING_COIN)

            # Position the coin
            coin.center_x = random.randrange(SCREEN_WIDTH)
            coin.center_y = random.randrange(120, SCREEN_HEIGHT)

            # Add the coin to the lists
            self.coin_list.append(coin)

        # Set the background color
        arcade.set_background_color(arcade.color.AMAZON)

    def on_draw(self):
        """
        Render the screen.
        """

        # This command has to happen before we start drawing
        arcade.start_render()

        # Draw all the sprites.
        self.coin_list.draw()
        self.bullet_list.draw()
        self.player_list.draw()

        # Put the text on the screen.
        output = f"Score: {self.score}"
        arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)

    def on_mouse_press(self, x, y, button, modifiers):
        """
        Called whenever the mouse moves.
        """
        # Create a bullet
        bullet = arcade.Sprite("images/laserBlue01.png", SPRITE_SCALING_LASER)

        # Position the bullet at the player's current location
        start_x = self.player_sprite.center_x
        start_y = self.player_sprite.center_y
        bullet.center_x = start_x
        bullet.center_y = start_y

        # Get from the mouse the destination location for the bullet
        # IMPORTANT! If you have a scrolling screen, you will also need
        # to add in self.view_bottom and self.view_left.
        dest_x = x
        dest_y = y

        # Do math to calculate how to get the bullet to the destination.
        # Calculation the angle in radians between the start points
        # and end points. This is the angle the bullet will travel.
        x_diff = dest_x - start_x
        y_diff = dest_y - start_y
        angle = math.atan2(y_diff, x_diff)

        # Angle the bullet sprite so it doesn't look like it is flying
        # sideways.
        bullet.angle = math.degrees(angle)
        print(f"Bullet angle: {bullet.angle:.2f}")

        # Taking into account the angle, calculate our change_x
        # and change_y. Velocity is how fast the bullet travels.
        bullet.change_x = math.cos(angle) * BULLET_SPEED
        bullet.change_y = math.sin(angle) * BULLET_SPEED

        # Add the bullet to the appropriate lists
        self.bullet_list.append(bullet)

    def update(self, delta_time):
        """ Movement and game logic """

        # Call update on all sprites
        self.bullet_list.update()

        # Loop through each bullet
        for bullet in self.bullet_list:

            # Check this bullet to see if it hit a coin
            hit_list = arcade.check_for_collision_with_list(bullet, self.coin_list)

            # If it did, get rid of the bullet
            if len(hit_list) > 0:
                bullet.kill()

            # For every coin we hit, add to the score and remove the coin
            for coin in hit_list:
                coin.kill()
                self.score += 1

            # If the bullet flies off-screen, remove it.
            if bullet.bottom > self.width or bullet.top < 0 or bullet.right < 0 or bullet.left > self.width:
                bullet.kill()


def main():
    game = MyGame()
    game.setup()
    arcade.run()


if __name__ == "__main__":
    main()