import request from "./request.js";
class EgoPose {
  constructor(sceneMeta, world, frameInfo) {
    this.world = world;
    this.data = this.world.data;
    this.sceneMeta = sceneMeta;
  }

  preload(on_preload_finished) {
    this.on_preload_finished = on_preload_finished;
    this.load_ego_pose();
  }

  load_ego_pose() {
    var xhr = new XMLHttpRequest();
    // we defined the xhr
    var _self = this;
    xhr.onreadystatechange = function () {
      if (this.readyState != 4) return;

      if (this.status == 200) {
        let egoPose = JSON.parse(this.responseText);
        _self.egoPose = egoPose;
      }

      console.log(_self.world.frameInfo.frame, "egopose", "loaded");
      _self.preloaded = true;

      if (_self.on_preload_finished) {
        _self.on_preload_finished();
      }
      if (_self.go_cmd_received) {
        _self.go(this.webglScene, this.on_go_finished);
      }

      // end of state change: it can be after some time (async)
    };

    xhr.open(
      "GET",
      request + "/load_ego_pose" +
        "?scene=" +
        this.world.frameInfo.scene +
        "&frame=" +
        this.world.frameInfo.frame,
      true
    );
    xhr.send();
  }

  go_cmd_received = false;
  on_go_finished = null;

  go(webglScene, on_go_finished) {
    if (this.preloaded) {
      if (on_go_finished) on_go_finished();
    } else {
      this.go_cmd_received = true;
      this.on_go_finished = on_go_finished;
    }
  }

  unload() {}
}

export { EgoPose };