const app = getApp();
Component({

  properties: {
    
  },

  data: {
    list: [],
    subList:[],
    subjects:[],
    subCurrent:-1
  },
  pageLifetimes:{
    show(){
      if(!this.disciplines)
        this.pullDisciplines();
    }
  },
  attached(){
    this.options = {page:1, limit:10};
    this.pullDisciplines();
    this.pullSubjects({refresh:1});
  },


  methods: {
    pullSubjects({refresh=0}={}){
      if(refresh){
        if(refresh==1){
          this.options.page = 1;
          var { options } = this;
        }else if(refresh==2){
          var {page, per_page} = this.options;
          var options = {...this.options,page:1, per_page: page*per_page};
        }
      }else{
        this.options.page++;
        var {options} = this;
      }
      return app.api("weapps.paths")(options).then(({subjects})=>{
        let length = subjects.length;
        if (!refresh){
          subjects = this.data.subjects.concat(subjects);
          var status = length>0?200:204;
        }else{
          var status = length>0?200:205;
        }
        this.setData({ subjects, status});
      }).catch(e=>{
        this.setData({subjects:[], status:e.code});
      })
    },
    onPullDownRefresh(){
      this.pullSubjects({refresh:2});
    },
    onReachBottom(){
      if(this.data.status==200)
        this.pullSubjects();
    },
    pullDisciplines(){
      this.disciplines = [];
      app.api("disciplines")({source:"subject"})
      .then(res=>{
        ;
        this.disciplines = res.disciplines;
        this.disciplines.unshift({id:"",name:"全部", sub_disciplines:[]});
        this.setNavList({disciplines: this.disciplines, key:"list"});
        //this.setNavList({disciplines: this.disciplines[0].sub_disciplines, key:"subList"});
      }).catch(e=>{
        this.disciplines = null;
      })
    },
    setNavList({disciplines, key}){
      let list = disciplines.map(i=>{
        return {text: i.name, id: i.id};
      })
      this.setData({[key]: list});
    },
    onCateChange({detail}){
      let {current, value} = detail;
      this.options.discipline_id = value.id;
      this.setNavList({disciplines: this.disciplines[current].sub_disciplines, key:"subList"});
      this.setData({subCurrent:-1});
      delete this.options.sub_discipline_id;
      this.pullSubjects({refresh:1});
    },
    onSubCateChange({detail}){
      let {current, value, source} = detail;
      if(source!="touch")
        return;
      this.setData({subCurrent:current});
      if(value.id)
        this.options.sub_discipline_id = value.id;
      else
        delete this.options.sub_discipline_id;
      this.pullSubjects({refresh:1});
    }
  }
})