// pages/moment/paper/index.js
import { getCategoryList } from "../../api/moment"
const util = require('../../../utils/util')
const storage = require('../../../utils/storage')
const event = require('../../../utils/event.js')
const app = getApp()

Page({
  /**
   * 页面的初始数据
   */
  data: {
    categoryList: [],
    cateIds: null,
    cateIdList: null
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    wx.showLoading({
      title: '加载中',
      mask: true
    })
    this.data.cateIds = storage.get('cateIdList' + app.globalData.userInfo.userId)
    if(!util.isEmpty(this.data.cateIds)){
      this.data.cateIdList = this.data.cateIds.toString().split(',')
    }
    getCategoryList().then(result => {
      //成功回调
      if(!util.isEmpty(this.data.cateIds)){
        for (let index = 0; index < result.data.records.length; index++) {
          if(this.checkCategory(result.data.records[index].id)){
            result.data.records[index].checked = true
          }
        }
      }
      this.setData({categoryList: result.data.records})
      wx.hideLoading()
    }).catch(err => {
      //异常回调
      wx.hideLoading()
    })
  },
  checkCategory: function(id){
    if(!this.data.cateIdList || !this.data.cateIdList.length){
      return false
    }
    for (let index = 0; index < this.data.cateIdList.length; index++) {
      if(id == this.data.cateIdList[index]){
        return true
      }
    }
    return false
  },
  checkPaper: function(e) {
    var index = e.target.dataset.index
    var item = this.data.categoryList[index]
    if(item.checked){
      this.setData({ ['categoryList[' + index + '].checked']: !item.checked})
      return
    }
    var sum = 0
    for (let i = 0; i < this.data.categoryList.length; i++) {
      if(this.data.categoryList[i].checked){
        sum++
      }
    }
    if(sum >= 5){
      util.showToast('最多只能关注5个纸品')
      return
    }
    this.setData({ ['categoryList[' + index + '].checked']: !item.checked})
  },
  onUnload: function(){
    var cateString = ''
    for (let i = 0; i < this.data.categoryList.length; i++) {
      if(this.data.categoryList[i].checked){
        if(util.isEmpty(cateString)){
          cateString = this.data.categoryList[i].id
        } else {
          cateString += ',' + this.data.categoryList[i].id
        }
      }
    }
    if(util.isEmpty(cateString) && util.isEmpty(this.data.cateIds)){
      return
    }
    if(cateString != this.data.cateIds){
      storage.put('cateIdList' + app.globalData.userInfo.userId, cateString)
      event.emit('EventMessage', { what: 502, desc: 'CateChange' })
    }
  }
 
})