import arcade
from arcade.draw_commands import load_texture
from arcade.draw_commands import draw_texture_rectangle
from arcade.draw_commands import Texture

# Constants
SCREEN_WIDTH = 1000
SCREEN_HEIGHT = 650
SCREEN_TITLE = "Platformer"

# Constants used to scale our sprites from their original size
CHARACTER_SCALING = 0.5
TILE_SCALING = 0.5

PLAYER_MOVEMENT_SPEED = 5
GRAVITY = 1
PLAYER_JUMP_SPEED = 15

# How many pixels to keep as a minimum margin between the character
# and the edge of the screen.
LEFT_VIEWPORT_MARGIN = 150
RIGHT_VIEWPORT_MARGIN = SCREEN_WIDTH - 150
BOTTOM_VIEWPORT_MARGIN = 50
TOP_VIEWPORT_MARGIN = 100


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

    def __init__(self):

        # Call the parent class and set up the window
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)

        # These are 'lists' that keep track of our sprites. Each sprite should
        # go into a list.
        self.player_list = None
        self.wall_list = None

        # Separate variable that holds the player sprite
        self.player_sprite = None

        # Used to keep track of our scrolling
        self.view_bottom = 0
        self.view_left = 0

        arcade.set_background_color(arcade.csscolor.CORNFLOWER_BLUE)

    def setup(self):
        """ Set up the game here. Call this function to restart the game. """
        # Create the Sprite lists
        self.player_list = arcade.SpriteList()
        self.wall_list = arcade.SpriteList()

        #self.player_sprite = arcade.Sprite();

        # Set up the player, specifically placing it at these coordinates.
        self.player_sprite = arcade.AnimatedTimeSprite(CHARACTER_SCALING)
        self.player_sprite.append_texture( load_texture("data/dinorun0000.png") )
        self.player_sprite.append_texture( load_texture("data/dinorun0001.png") )
        self.player_sprite.center_x = 64
        self.player_sprite.center_y = 120
        self.player_list.append(self.player_sprite)


        # Create the ground
        for x in range(0, 125000, 64):
            wall = arcade.Sprite("data/grass.png", TILE_SCALING)
            wall.center_x = x
            wall.center_y = 32
            self.wall_list.append(wall)

        # Create the 'physics engine'
        self.physics_engine = arcade.PhysicsEnginePlatformer(self.player_sprite, self.wall_list, GRAVITY)
        # enable the double-jump
        self.physics_engine.enable_multi_jump(2)

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

        # Clear the screen to the background color
        arcade.start_render()

        # Draw our sprites
        self.wall_list.draw()
        self.player_sprite.draw()

    def on_key_press(self, key, modifiers):
        if key == arcade.key.UP or key == arcade.key.W:
            if self.physics_engine.can_jump():
                self.player_sprite.change_y = PLAYER_JUMP_SPEED
                self.physics_engine.increment_jump_counter()
        #elif key == arcade.key.LEFT or key == arcade.key.A:
        #    self.player_sprite.change_x = -PLAYER_MOVEMENT_SPEED
        elif key == arcade.key.RIGHT or key == arcade.key.D:
            self.player_sprite.change_x = PLAYER_MOVEMENT_SPEED

    def on_key_release(self, key, modifiers):
        if key == arcade.key.LEFT or key == arcade.key.A:
            self.player_sprite.change_x = 0
        elif key == arcade.key.RIGHT or key == arcade.key.D:
            self.player_sprite.change_x = 0

    def update(self, delta_time):
        self.physics_engine.update()
        self.player_sprite.update_animation()

        # --- Manage Scrolling ---

        # Track if we need to change the viewport

        changed = False

        # Scroll left
        left_boundary = self.view_left + LEFT_VIEWPORT_MARGIN
        if self.player_sprite.left < left_boundary:
            self.view_left -= left_boundary - self.player_sprite.left
            changed = True

        # Scroll right
        right_boundary = self.view_left + SCREEN_WIDTH - RIGHT_VIEWPORT_MARGIN
        if self.player_sprite.right > right_boundary:
            self.view_left += self.player_sprite.right - right_boundary
            changed = True

        # Scroll up
        top_boundary = self.view_bottom + SCREEN_HEIGHT - TOP_VIEWPORT_MARGIN
        if self.player_sprite.top > top_boundary:
            self.view_bottom += self.player_sprite.top - top_boundary
            changed = True

        # Scroll down
        bottom_boundary = self.view_bottom + BOTTOM_VIEWPORT_MARGIN
        if self.player_sprite.bottom < bottom_boundary:
            self.view_bottom -= bottom_boundary - self.player_sprite.bottom
            changed = True

        if changed:
            # Only scroll to integers. Otherwise we end up with pixels that
            # don't line up on the screen
            self.view_bottom = int(self.view_bottom)
            self.view_left = int(self.view_left)

            # Do the scrolling
            arcade.set_viewport(self.view_left,
                                SCREEN_WIDTH + self.view_left,
                                self.view_bottom,
                                SCREEN_HEIGHT + self.view_bottom)

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


if __name__ == "__main__":
    main()