const AV = require('../lib/av-live-query-weapp-min');
const  Presence  = require("./presence")

class Class extends AV.Object{
  get name(){
    return this.get("name");
  }
  set name(value){
    this.set("name", value);
  }
  get students(){
    return this.get("students");
  }
  add_student(user){
    this.addUnique("students", user.id);
  }
  del_student(user){
    let students = this.get("students");
    if(user.id in students){
      this.remove(user.id);
    }
  }
  static all() {
    var query = new AV.Query("Class_");
    return query.find();
  }
  enter() {
    this.leave();
    this._presence = new Presence({
      user: AV.User.current(),
      class: this
    });
    this._presence.save();
  }
  leave() {
    if (this._presence != null) {
      this._presence.destroy();
    }
  }
  present_students() {
    var query = new AV.Query("Presence");
    //query.equalTo("class", this._class.id);
    let students = query.find();
    console.log(students);
    return students;
  }
}

AV.Object.register(Class, "Class_");
module.exports = Class;