import { categoryZh } from "./obj_cfg.js";

class ObjectIdManager {
  maxId = 1;
  objectList = [];
  //todo: should use all worldlist
  generateNewUniqueId(world) {
    this.maxId += 1;
    return this.maxId;
  }

  scene = "";
  setCurrentScene(scene, done) {
    if (scene != this.scene) {
      this.scene = scene;
      this.load_obj_ids_of_scene(scene, done);
    }
  }

  forceUpdate(done) {
    this.load_obj_ids_of_scene(this.scene, done);
  }

  // should just tell  editor
  // don't change html elements directly.
  setObjdIdListOptions() {
    let objSelOptions = this.objectList
      .map(function (c) {
        return (
          "<option value=" +
          c.id +
          ">" +
          String(c.id) +
          "-" +
          categoryZh[c.category] +
          "</option>"
        );
      })
      .reduce(function (x, y) {
        return x + y;
      }, "<option>对象</option>");
    document.getElementById("object-selector").innerHTML = objSelOptions;

    let objIdsOptions = this.objectList
      .map(function (c) {
        return "<option value=" + c.id + ">" + c.category + "</option>";
      })
      .reduce(
        function (x, y) {
          return x + y;
        },
        //"<option value='auto'></option><option value='new'></option>");
        //"<option value='new'>suggest a new id</option>"
        ""
      );

    document.getElementById("obj-ids-of-scene").innerHTML = objIdsOptions;
  }

  sortObjIdList() {
    this.objectList = this.objectList.sort(function (x, y) {
      return parseInt(x.id) - parseInt(y.id);
    });
  }

  // called when 1) new object 2) category/id modified
  addObject(obj) {
    if (
      !this.objectList.find((x) => x.id == obj.id && x.category == obj.category)
    ) {
      this.objectList.push(obj);
      this.sortObjIdList();

      this.setObjdIdListOptions();

      if (obj.id > this.maxId) {
        this.maxId = parseInt(obj.id);
      }
    }
  }

  load_obj_ids_of_scene(scene, done) {
    var xhr = new XMLHttpRequest();
    // we defined the xhr
    let self = this;

    xhr.onreadystatechange = function () {
      if (this.readyState != 4) return;

      if (this.status == 200) {
        var ret = JSON.parse(this.responseText);

        self.objectList = ret;
        self.sortObjIdList();
        self.maxId = Math.max(
          ...ret.map(function (x) {
            return x.id;
          })
        );
        if (self.maxId < 0)
          // this is -infinity if there is no ids.
          self.maxId = 0;

        self.setObjdIdListOptions();

        if (done) done(ret);
      }
    };

    xhr.open("GET", "/objs_of_scene?scene=" + scene, true);
    xhr.send();
  }

  getObjById(id) {
    return this.objectList.find((x) => x.id == id);
  }
}

let objIdManager = new ObjectIdManager();

export { objIdManager };