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 initialize(levelId: number, wallHealth: number) {
    this.data = {
      levelId,
      wallHealth,
      enemiesTotal: 0,
      enemiesKilled: 0,
      currentWave: 1,
      //drops: [],
      startTime: Date.now(),
      sessionCoins: 45
    };
    console.log(`[LevelSessionManager] 初始化完成，sessionCoins设置为: ${this.data.sessionCoins}`);
  }

  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; }
}