// miniprogram/page/API/pages/get-performance/get-performance.js

const util = require('./util')

const performance = wx.getPerformance ? wx.getPerformance() : {}
const performanceObserver = performance.createObserver ? performance.createObserver() : null


Page({
  onShareAppMessage() {
    return {
      title: '周期性缓存',
      path: 'packageAPI/pages/performance/get-performance/get-performance'
    }
  },
  data: {
    theme: 'light',
    array: [],
    support: false,
  },
  onLoad() {
    this.setData({
      theme: wx.getSystemInfoSync().theme || 'light'
    })

    if (wx.onThemeChange) {
      wx.onThemeChange(({theme}) => {
        this.setData({theme})
      })
    }
    console.log('canIUse:getPerformance:', wx.canIUse('getPerformance'))
    let canIUse = false
    if (wx.getPerformance) {
      canIUse = true
    }
    this.setData({
      support: canIUse,
    })
  },
  getPerformanceInfo() {
    const EntryList = performance.getEntries()
    const array = []
    EntryList.forEach((item) => {
      array.push({
        entryType: util.renderEntryType(item.entryType),
        name: util.renderName(item.name),
        duration: util.renderDuration(item.duration),
        startTime: util.renderStartTime(item.startTime),
      })
    })
    this.setData({
      array,
    })
  },

  startObserver() {
    // 监听需要的性能指标
    performanceObserver.observe({entryTypes: ['render', 'script', 'navigation']})
  },

  stopObserver() {
    // 结束监听
    performanceObserver.disconnect()
  }
})