import pygame
import sys
from settings import Settings
from ship import Ship
from bullet import Bullet
from alien import Alien
class AlienInvasion:
    """Overall class to manage game assets and behavior."""
    def __init__(self) -> None:
        """Initialize the game, and create game resources."""
        pygame.init()
        self.settings = Settings()
        self.screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
        self.settings.screen_width = self.screen.get_rect().width
        self.settings.screen_height = self.screen.get_rect().height
        self.screen = pygame.display.set_mode((self.settings.screen_width, self.settings.screen_height))
        pygame.display.set_caption("Alien Invasion")
        self.ship = Ship(self)
        self.bullets = pygame.sprite.Group()
        self.aliens = pygame.sprite.Group()
        self._create_fleet()

        # Set background color
        self.bg_color = (230, 230, 230)

    def run_game(self):
        """Start the main loop for the game."""
        while True:
            self._check_events()  # Call the method here
            self.ship.update()
            self._update_bullets()
            self._update_aliens()
    def _update_aliens(self):
        """Update the positions of all aliens in the fleet."""
        self.aliens.update()
    def _update_bullets(self):
        """Update position of bullets and get rid of old bullets."""
        # Update bullet positions.
        self.bullets.update()
            # Get rid of bullets that have disappeared.
        for bullet in self.bullets.copy():
            if bullet.rect.bottom <= 0:
                    self.bullets.remove(bullet)
        print(len(self.bullets))
        self._update_screen()  # Correct the method name

    def _check_events(self):
        """Respond to keypresses and mouse events."""
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                self._check_keydown_events(event)
            elif event.type == pygame.KEYUP:
                self._check_keyup_events(event)
    def _check_keydown_events(self, event):
        """Respond to keypresses."""
        if event.key == pygame.K_RIGHT:
            self.ship.moving_right = True
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = True
        elif event.key == pygame.K_q:
            sys.exit()
        elif event.key == pygame.K_SPACE:
            self._fire_bullet()
    def _check_keyup_events(self, event):
        """Respond to key releases."""
        if event.key == pygame.K_RIGHT:
            self.ship.moving_right = False
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = False
    def _fire_bullet(self):
        """Create a new bullet and add it to the bullets group."""
        if len(self.bullets) < self.settings.bullets_allowed:
            new_bullet = Bullet(self)
            self.bullets.add(new_bullet)
    def _create_fleet(self):
        """Create the fleet of aliens."""
        # Create an alien and find the number of aliens in a row.
        # Spacing between each alien is equal to one alien width.
        alien = Alien(self)
        alien_width, alien_height = alien.rect.size
        available_space_x = self.settings.screen_width - (2 * alien_width)
        number_aliens_x = available_space_x // (2 * alien_width)
        # Determine the number of rows of aliens that fit on the screen.
        ship_height = self.ship.rect.height
        available_space_y = (self.settings.screen_height,
                                (3 * alien_height) - ship_height)
        number_rows = available_space_y // (2 * alien_height)
        # Create the full fleet of aliens.
        for row_number in range(number_rows):
        # Create the first row of aliens.
            for alien_number in range(number_aliens_x):
                self._create_alien(alien_number, row_number)
    def _create_alien(self, alien_number, row_number):
        """Create an alien and place it in the row."""
        # Create an alien and place it in the row.
        alien = Alien(self)
        alien_width, alien_height = alien.rect.size
        alien.x = alien_width + 2 * alien_width * alien_number
        alien.rect.x = alien.x
        alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
        self.aliens.add(alien)
        # Make an alien.
        alien = Alien(self)
        self.aliens.add(alien)
    def _update_screen(self):
        """Update images on the screen, and flip to the new screen."""
        # Redraw the screen during each pass through the loop
        self.screen.fill(self.bg_color)
        self.ship.blitme()
        for bullet in self.bullets.sprites():
            bullet.draw_bullet()
        self.aliens.draw(self.screen)

        # Make the most recently drawn screen visible
        pygame.display.flip()

if __name__ == '__main__':
    # Make a game instance, and run the game.
    ai = AlienInvasion()
    ai.run_game()