import pygame

from compute import matmul, rot_2D
from game import Game

EARTH_RADIUS = 30
MOON_RADIUS = 10
MOON_DISTANCE = 100.0
theta = 0.01

BLACK = (0, 0, 0)
BLUE = (0, 0, 255)
GRAY = (200, 200, 200)


class Moon(Game):
    """Der Mond kreist um die Erde."""

    def __init__(self, title="Moon", fps=60, size=(640, 400)):
        super().__init__(title, fps, size) # Ruft Konstruktor von Game auf
        self.center_x = size[0] // 2
        self.center_y = size[1] // 2 # Center position von Erde
        self.init_positions()

    def init_positions(self):
        self.position_moon = (MOON_DISTANCE, 0.0)
        self.rot_moon = rot_2D(theta)

    def rotate_point(self, position, rotation):
        result = matmul(rotation, [[position[0]], [position[1]]])
        return (result[0][0], result[1][0])

    def update_game(self):
        self.update_positions()
        return True

    def update_positions(self):
        self.position_moon = self.rotate_point(self.position_moon, self.rot_moon)

    def to_screen(self, position):
        return (int(self.center_x + position[0]), int(self.center_y + position[1]))

    def draw_game(self):
        self.screen.fill(BLACK)
        self.draw_scene()
        pygame.display.flip()

    def draw_scene(self):
        self.draw_earth()
        self.draw_moon()

    def draw_earth(self):
        pygame.draw.circle(
            self.screen, BLUE, (self.center_x, self.center_y), EARTH_RADIUS
        )

    def draw_moon(self):
        pygame.draw.circle(
            self.screen, GRAY, self.to_screen(self.position_moon), MOON_RADIUS
        )


if __name__ == "__main__":
    Moon().run()