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import pygame
import sys
import random

# Initialize Pygame
pygame.init()

# Constants
WIDTH, HEIGHT = 400, 600
GROUND_HEIGHT = 50
FPS = 60
GRAVITY = 0.25
JUMP = -5

# Colors
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)

# Create the game window
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Flappy Bird")

# Load images
bird_img = pygame.image.load("bird.png")
background_img = pygame.image.load("background.png")
pipe_img = pygame.image.load("pipe.png")
ground_img = pygame.image.load("ground.png")

# Scale images
bird_img = pygame.transform.scale(bird_img, (50, 50))
pipe_img = pygame.transform.scale(pipe_img, (50, 300))
ground_img = pygame.transform.scale(ground_img, (WIDTH, GROUND_HEIGHT))

# Bird class
class Bird(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = bird_img
        self.rect = self.image.get_rect()
        self.rect.center = (100, HEIGHT // 2)
        self.velocity = 0

    def update(self):
        self.velocity += GRAVITY
        self.rect.y += self.velocity

    def jump(self):
        self.velocity = JUMP

# Pipe class
class Pipe(pygame.sprite.Sprite):
    def __init__(self, x):
        super().__init__()
        self.image = pipe_img
        self.rect = self.image.get_rect()
        self.rect.height = random.randint(100, 400)
        self.rect.width = 50
        self.rect.x = x
        self.rect.y = 0

    def update(self):
        self.rect.x -= 5
        if self.rect.right < 0:
            self.rect.x = WIDTH
            self.rect.height = random.randint(100, 400)

# Ground class
class Ground(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = ground_img
        self.rect = self.image.get_rect()
        self.rect.y = HEIGHT - GROUND_HEIGHT

    def update(self):
        self.rect.x -= 5
        if self.rect.right < 0:
            self.rect.x = WIDTH

# Create sprite groups
all_sprites = pygame.sprite.Group()
pipes = pygame.sprite.Group()

# Create game objects
bird = Bird()
ground = Ground()
all_sprites.add(bird, ground)

# Game loop
clock = pygame.time.Clock()

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                bird.jump()

    # Update
    all_sprites.update()
    pipes.update()

    # Check for collisions
    if pygame.sprite.spritecollide(bird, pipes, False):
        pygame.quit()
        sys.exit()

    # Create new pipes
    if random.randint(1, 100) < 5:
        pipe = Pipe(WIDTH)
        pipes.add(pipe)
        all_sprites.add(pipe)

    # Remove off-screen pipes
    for pipe in pipes.copy():
        if pipe.rect.right < 0:
            pipes.remove(pipe)
            all_sprites.remove(pipe)

    # Draw
    screen.blit(background_img, (0, 0))
    all_sprites.draw(screen)
    pipes.draw(screen)

    # Refresh screen
    pygame.display.flip()

    # Cap the frame rate
    clock.tick(FPS)
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