import { resources, JsonAsset } from 'cc';

export interface LevelRuntimeData {
  levelId: number;               // 本局关卡
  wallHealth: number;            // 当前墙血
  enemiesTotal: number;          // 本关总敌人
  enemiesKilled: number;         // 已击杀
  currentWave: number;           // 当前波
  //drops: DropItemData[];         // 已掉落的道具
  startTime: number;

  sessionCoins: number;          // 本局金币（购买方块）
}

export class LevelSessionManager {
  private static _inst: LevelSessionManager;
  public static get inst() { return this._inst || (this._inst = new LevelSessionManager()); }

  private data: LevelRuntimeData = null;

  /** 准备本关运行期数据 */
  public async initialize(levelId: number, wallHealth: number) {
    // 从关卡配置读取初始金币
    const initialCoins = await this.loadInitialCoins(levelId);
    
    this.data = {
      levelId,
      wallHealth,
      enemiesTotal: 0,
      enemiesKilled: 0,
      currentWave: 1,
      //drops: [],
      startTime: Date.now(),
      sessionCoins: initialCoins
    };
    console.log(`[LevelSessionManager] 初始化完成，关卡${levelId}初始金币设置为: ${this.data.sessionCoins}`);
  }

  /** 从关卡配置文件加载初始金币数量 */
  private async loadInitialCoins(levelId: number): Promise<number> {
    try {
      const jsonPath = `data/levels/Level${levelId}`;
      console.log(`[LevelSessionManager] 尝试加载关卡配置: ${jsonPath}`);
      
      return new Promise<number>((resolve) => {
        resources.load(jsonPath, JsonAsset, (err, asset) => {
          if (err) {
            console.warn(`[LevelSessionManager] 加载关卡${levelId}配置失败，使用默认初始金币45:`, err);
            resolve(45); // 默认值
            return;
          }
          
          const levelConfig = asset.json;
          if (levelConfig && typeof levelConfig.initialCoins === 'number') {
            console.log(`[LevelSessionManager] 关卡${levelId}初始金币配置: ${levelConfig.initialCoins}`);
            resolve(levelConfig.initialCoins);
          } else {
            console.warn(`[LevelSessionManager] 关卡${levelId}配置中未找到initialCoins字段，使用默认值45`);
            resolve(45); // 默认值
          }
        });
      });
    } catch (error) {
      console.error(`[LevelSessionManager] 加载关卡${levelId}初始金币配置时发生错误:`, error);
      return 45; // 默认值
    }
  }

  public get runtime() { return this.data; }

  /** 关卡结束后调用，让 GC 自动回收 */
  public clear() { this.data = null; }

  // ======== 本局金币接口 ========
  public getCoins(): number { 
    const coins = this.data?.sessionCoins ?? 0;
    console.log(`[LevelSessionManager] getCoins() 返回: ${coins}, data存在: ${!!this.data}`);
    return coins;
  }
  public addCoins(amt:number){ if(this.data) this.data.sessionCoins += amt; }
  /** 成功返回true */
  public spendCoins(amt:number):boolean{ if(!this.data || amt<=0) return false; if(this.data.sessionCoins<amt) return false; this.data.sessionCoins-=amt; return true; }
}