import { Engine, Matrix, Texture2D, TextureFormat } from "oasis-engine";
import { PaladinAdapter } from "../adapter/PaladinAdapter";
import { ARAndroid } from "./Android/ARAndroid";
import { ARConfig } from "./AREnum";
import { IARCtrl } from "./IARCtrl";
import { ARIos } from "./IOS/ARIos";

export class ARManager {
  private static _ins: ARManager;

  private _initialized: boolean = false;
  private _arCtrl: IARCtrl;

  public static get ins() {
    if (!this._ins) {
      this._ins = new ARManager();
    }
    return this._ins;
  }

  /**
   * 获取相机的世界矩阵
   */
  get worldMatrix(): Matrix {
    return this._arCtrl._worldMatrix;
  }

  /**
   * 获取相机的投影矩阵
   */
  get projectMatrix(): Matrix {
    return this._arCtrl._projectMatrix;
  }

  /**
   * 获取纹理的校准矩阵
   */
  get textureProject(): Matrix {
    return this._arCtrl._textureProject;
  }

  /**
   * 获取相机视频流的 Y 纹理
   */
  get textureY(): Texture2D {
    return this._arCtrl._textureY;
  }

  /**
   * 获取相机视频流的 UV 纹理
   */
  get textureUV(): Texture2D {
    return this._arCtrl._textureUV;
  }

  /**
   * 创建
   * @param config - AR 配置
   * @param success - 成功回调
   * @param fail - 失败回调
   */
  public create(engine: Engine, config: ARConfig, success: Function, fail?: Function) {
    if (this._initialized) {
      return;
    }
    if (PaladinAdapter.isIOS) {
      this._arCtrl = new ARIos(engine);
    } else {
      this._arCtrl = new ARAndroid(engine);
    }
    // 添加 onShow 与 onHide 的逻辑
    PaladinAdapter.addOnShowListener("AR", this._arCtrl.onShow);
    PaladinAdapter.addOnHideListener("AR", this._arCtrl.onHide);
    this._initialized = true;
    this._arCtrl.create(config, success, fail);
  }

  /**
   * 开始
   * @param startCallBack - start 可以是一个异步的过程
   */
  public start(startCallBack: Function) {
    if (this._initialized) {
      this._arCtrl.start(startCallBack);
    } else {
      console.log("请先初始化 ARManager .");
    }
  }

  /**
   * 帧处理
   */
  public update() {
    this._initialized && this._arCtrl.update();
  }

  /**
   * 销毁
   */
  public destroy() {
    if (this._initialized) {
      this._arCtrl.destroy();
      this._arCtrl = null;
      this._initialized = false;
    }
  }
}