import pygame
import random

# 初始化 Pygame
pygame.init()

# 游戏常量
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 400
FPS = 60

# 颜色定义
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 50, 50)
GREEN = (50, 255, 50)
SKY_BLUE = (135, 206, 235)

# 创建屏幕
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption("简易跑酷游戏")

clock = pygame.time.Clock()
font = pygame.font.SysFont("SimHei", 30)

class Player:
    def __init__(self):
        self.width = 40
        self.height = 60
        self.x = 100
        self.y = SCREEN_HEIGHT - self.height - 20
        self.vel_y = 0
        self.jump_power = -15
        self.gravity = 0.8
        self.on_ground = True

    def jump(self):
        if self.on_ground:
            self.vel_y = self.jump_power
            self.on_ground = False

    def update(self):
        # 应用重力
        self.vel_y += self.gravity
        self.y += self.vel_y

        # 地面检测
        ground_y = SCREEN_HEIGHT - self.height - 20
        if self.y >= ground_y:
            self.y = ground_y
            self.vel_y = 0
            self.on_ground = True

    def draw(self):
        pygame.draw.rect(screen, GREEN, (self.x, self.y, self.width, self.height))

class Obstacle:
    def __init__(self):
        self.width = 30
        self.height = random.randint(40, 70)
        self.x = SCREEN_WIDTH
        self.y = SCREEN_HEIGHT - self.height - 20
        self.speed = 7

    def update(self):
        self.x -= self.speed

    def draw(self):
        pygame.draw.rect(screen, RED, (self.x, self.y, self.width, self.height))

def main():
    player = Player()
    obstacles = []
    score = 0
    spawn_timer = 0
    game_over = False

    running = True
    while running:
        # 1. 事件处理
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_SPACE:
                    if game_over:
                        # 重新开始游戏
                        main()
                        return
                    else:
                        player.jump()

        if not game_over:
            # 2. 更新逻辑
            player.update()

            # 生成障碍物 (大约每 1-2 秒生成一个)
            spawn_timer += 1
            if spawn_timer > random.randint(50, 100):
                obstacles.append(Obstacle())
                spawn_timer = 0

            # 更新障碍物
            for obs in obstacles[:]:
                obs.update()
                # 碰撞检测
                player_rect = pygame.Rect(player.x, player.y, player.width, player.height)
                obs_rect = pygame.Rect(obs.x, obs.y, obs.width, obs.height)
                if player_rect.colliderect(obs_rect):
                    game_over = True
                
                # 移除屏幕外的障碍物并加分
                if obs.x + obs.width < 0:
                    obstacles.remove(obs)
                    score += 1

        # 3. 绘制画面
        screen.fill(SKY_BLUE) # 天空背景
        
        # 画地面
        pygame.draw.rect(screen, BLACK, (0, SCREEN_HEIGHT - 20, SCREEN_WIDTH, 20))
        
        player.draw()
        for obs in obstacles:
            obs.draw()

        # 显示分数
        score_text = font.render(f"分数: {score}", True, BLACK)
        screen.blit(score_text, (10, 10))

        if game_over:
            over_text = font.render("游戏结束! 按空格重新开始", True, RED)
            text_rect = over_text.get_rect(center=(SCREEN_WIDTH//2, SCREEN_HEIGHT//2))
            screen.blit(over_text, text_rect)

        pygame.display.flip()
        clock.tick(FPS)

    pygame.quit()

if __name__ == "__main__":
    main()