export class LevelCompressedManager {
    private static instance: LevelCompressedManager;
    private levelDataCache: Map<number, any> = new Map();
    private allLevelsData: any = null;
    private compressedData: string = null;
    private isLoading: boolean = false;

    private static get LZString(): any {
        return (window as any).LZString;
    }

    public static getInstance(): LevelCompressedManager {
        if (!LevelCompressedManager.instance) {
            LevelCompressedManager.instance = new LevelCompressedManager();
        }
        return LevelCompressedManager.instance;
    }

    public setCompressedData(compressed: string): void {
        this.compressedData = compressed;
        this.allLevelsData = null;
        this.levelDataCache.clear();
    }

    public async loadLevel(level: number): Promise<any> {
        if (this.levelDataCache.has(level)) {
            return this.levelDataCache.get(level);
        }

        await this.ensureDataLoaded();

        if (this.allLevelsData && this.allLevelsData[level]) {
            const levelData = this.allLevelsData[level];
            this.levelDataCache.set(level, levelData);
            return levelData;
        }

        return null;
    }

    private async ensureDataLoaded(): Promise<void> {
        if (this.allLevelsData !== null) {
            return;
        }

        if (this.isLoading) {
            return;
        }

        this.isLoading = true;

        try {
            if (this.compressedData) {
                const decompressed = LevelCompressedManager.LZString.decompressFromUTF16(this.compressedData);
                if (decompressed) {
                    this.allLevelsData = JSON.parse(decompressed);
                    console.log(`关卡数据解压成功，共 ${Object.keys(this.allLevelsData).length} 个关卡`);
                } else {
                    console.error('关卡数据解压失败');
                    this.allLevelsData = {};
                }
            } else {
                console.warn('没有设置压缩数据');
                this.allLevelsData = {};
            }
        } catch (e) {
            console.error('关卡数据解析失败:', e);
            this.allLevelsData = {};
        } finally {
            this.isLoading = false;
        }
    }

    public clearCache(): void {
        this.levelDataCache.clear();
    }

    public getLevelCount(): number {
        return this.allLevelsData ? Object.keys(this.allLevelsData).length : 0;
    }
}