import { _decorator, Component, Node, director, assetManager, ProgressBar, Label, Sprite, SpriteFrame, resources } from 'cc';
const { ccclass, property } = _decorator;

// 微信小游戏API类型声明
declare global {
    interface Window {
        wx?: {
            loadSubpackage?: (options: {
                name: string;
                success?: () => void;
                fail?: (err: any) => void;
            }) => any;
        };
    }
    const wx: {
        loadSubpackage?: (options: {
            name: string;
            success?: () => void;
            fail?: (err: any) => void;
        }) => any;
    } | undefined;
}

@ccclass('LaunchScreen')
export class LaunchScreen extends Component {
    @property(ProgressBar)
    progressBar: ProgressBar = null;

    @property(Label)
    progressLabel: Label = null;

    @property(Sprite)
    backgroundSprite: Sprite = null;

    @property(SpriteFrame)
    launchBackground: SpriteFrame = null;

    private totalAssets = 0;
    private loadedAssets = 0;

    start() {
        console.log('[LaunchScreen] 启动页开始初始化');
        
        // 设置启动页背景
        this.setupBackground();
        
        // 开始预加载游戏资源
        this.preloadGameAssets();
    }

    /**
     * 设置启动页背景
     */
    private setupBackground() {
        if (this.backgroundSprite && this.launchBackground) {
            this.backgroundSprite.spriteFrame = this.launchBackground;
            console.log('[LaunchScreen] 启动页背景设置完成');
        }
    }

    /**
     * 预加载游戏资源
     */
    private async preloadGameAssets() {
        try {
            console.log('[LaunchScreen] 开始预加载游戏资源');
            
            // 更新进度显示
            this.updateProgress(0, '正在加载游戏资源...');

            // 直接预加载GameLevel场景（不使用分包）
            await this.preloadGameLevelScene();
            
            // 预加载完成，跳转到游戏场景
            this.loadGameScene();
            
        } catch (error) {
            console.error('[LaunchScreen] 资源预加载失败:', error);
            this.updateProgress(0, '资源加载失败，请重试');
        }
    }

    /**
     * 直接预加载GameLevel场景
     */
    private preloadGameLevelScene(): Promise<void> {
        return new Promise<void>((resolve, reject) => {
            console.log('[LaunchScreen] 开始预加载GameLevel场景');
            
            // 直接预加载场景
            director.preloadScene('GameLevel', (finished: number, total: number) => {
                const progress = finished / total;
                this.updateProgress(progress * 100, `正在加载游戏场景... ${Math.floor(progress * 100)}%`);
            }, (err) => {
                if (err) {
                    console.error('[LaunchScreen] GameLevel场景预加载失败:', err);
                    // 预加载失败时，仍然尝试直接跳转（可能场景存在但预加载失败）
                    console.log('[LaunchScreen] 预加载失败，但仍将尝试直接加载场景');
                    this.updateProgress(100, '准备进入游戏...');
                    resolve();
                    return;
                }
                
                console.log('[LaunchScreen] GameLevel场景预加载完成');
                this.updateProgress(100, '加载完成！');
                resolve();
            });
        });
    }
    
    /**
     * 更新加载进度
     */
    private updateProgress(progress: number, message: string) {
        if (this.progressBar) {
            this.progressBar.progress = progress / 100;
        }
        
        if (this.progressLabel) {
            this.progressLabel.string = message;
        }
        
        console.log(`[LaunchScreen] ${message} (${progress.toFixed(1)}%)`);
    }

    /**
     * 跳转到游戏场景
     */
    private loadGameScene() {
        console.log('[LaunchScreen] 准备跳转到GameLevel场景');
        
        // 延迟一秒后跳转，让用户看到加载完成的提示
        this.scheduleOnce(() => {
            // 直接加载GameLevel场景
            director.loadScene('GameLevel', (err) => {
                if (err) {
                    console.error('[LaunchScreen] GameLevel场景加载失败:', err);
                    console.log('[LaunchScreen] 尝试降级方案：停留在启动页面');
                    this.updateProgress(0, 'GameLevel场景不存在，请检查场景配置');
                    
                    // 提供重试按钮或其他交互方式
                    this.scheduleOnce(() => {
                        this.updateProgress(0, '点击屏幕重试或检查场景配置');
                    }, 2.0);
                    return;
                }
                
                console.log('[LaunchScreen] 成功切换到GameLevel场景');
            });
        }, 1.0);
    }
}