const storage = require('../../utils/storage')
const planMod = require('../../utils/plan')
const util = require('../../utils/util')
const themeMod = require('../../utils/theme')
const iconsMod = require('../../utils/icons')

const MAX_CUSTOM_DURATION = 3600  // 1 hour max

Page({
  data: {
    theme: { primary: '#FF6B35', primaryLight: '#FF8C5A', primaryBg: '#FFF3ED', primaryRgb: '255,107,53' },
    themeStyle: themeMod.BASE_VARS,
    todayTarget: 0,
    todayDone: false,
    todayDuration: 0,
    todayTargetText: '',
    // Ring number font size in rpx. WeChat auto-scales text by the user's
    // font-size setting (fontSizeScaleFactor) but does NOT scale rpx box
    // dimensions — so on a real device with enlarged system font the 84rpx
    // number grows past the fixed-size circular ring and gets clipped. We
    // cancel that scale here so the number renders at a constant visual size
    // (matching the devtools/simulator) on every device. See _readFontScale().
    targetTimeFontSize: 84,
    streakCount: 0,
    planName: '',
    planDay: 1,
    planTotal: 7,
    planProgress: 0,
    showPicker: false,
    presets: [30, 60, 90, 120, 180, 300],
    customDuration: 60,
    customInput: '',
    icons: iconsMod.build()
  },

  onLoad() {
    themeMod.applyThemeToPage(this)
    this._readFontScale()
    this._firstShow = true
  },

  /**
   * Read the device's WeChat font-size scale and compensate the ring number
   * so it never overflows the fixed circular clip on real devices.
   *
   * WeChat auto-applies `fontSizeScaleFactor` to ALL text (including rpx font
   * sizes) but leaves rpx box dimensions untouched. A user who bumps up the
   * system font therefore sees enlarged text inside a non-enlarged ring.
   *
   * CRITICAL asymmetry: the DevTools simulator reports the SAME
   * `fontSizeScaleFactor` as a real device (the user's actual WeChat setting)
   * but does NOT actually scale rendered text. So if we compensate there, the
   * number ends up too small in the simulator. We therefore SKIP the
   * compensation under DevTools (host.env === 'devtools') and keep the design
   * size — matching what the simulator renders literally.
   *
   * On real devices, dividing our design size by the factor cancels the
   * auto-scale, keeping the number a constant 84rpx-equivalent everywhere.
   * Bounded so a bad reading can only ever make the number smaller (safe),
   * never larger (overflow).
   */
  _readFontScale() {
    let factor = 1
    try {
      const info = wx.getAppBaseInfo ? wx.getAppBaseInfo() : wx.getSystemInfoSync()
      const isDevtools = info.host && info.host.env === 'devtools'
      if (!isDevtools) {
        if (typeof info.fontSizeScaleFactor === 'number' && info.fontSizeScaleFactor > 0) {
          factor = info.fontSizeScaleFactor
        } else if (typeof info.fontSizeSetting === 'number' && info.fontSizeSetting > 0) {
          // fontSizeScaleFactor == currentFontSize / standardFontSize(17px)
          factor = info.fontSizeSetting / 17
        }
      }
    } catch (e) {}
    const DESIGN = 84
    let size = Math.round(DESIGN / factor)
    size = Math.max(48, Math.min(96, size))
    this.setData({ targetTimeFontSize: size })
  },

  onShow() {
    themeMod.applyThemeToPage(this)
    try {
      const tb = this.getTabBar()
      if (tb) tb.setData({ selected: 0 })
    } catch (e) {}
    // Skip the first onShow to avoid double-refresh; subsequent tab switches still refresh.
    if (this._firstShow) {
      this._firstShow = false
      this.refresh()
      this._checkFreshTrain()
      return
    }
    this.refresh()
    this._checkFreshTrain()
  },

  /**
   * If user just returned from completing a training, briefly highlight
   * the "今日已完成" badge so the success feels tangible. The flag is
   * timestamped; older than 10s is treated as stale (e.g. user reopened
   * the app later).
   */
  _checkFreshTrain() {
    try {
      const at = wx.getStorageSync('_last_train_at')
      if (!at) return
      const age = Date.now() - at
      if (age < 0 || age > 10 * 1000) {
        wx.removeStorageSync('_last_train_at')
        return
      }
      wx.removeStorageSync('_last_train_at')
      this.setData({ justCompleted: true })
      if (this._justCompletedTimer) clearTimeout(this._justCompletedTimer)
      this._justCompletedTimer = setTimeout(() => {
        this.setData({ justCompleted: false })
      }, 3000)
    } catch (e) {}
  },

  onPullDownRefresh() {
    this.refresh()
    wx.stopPullDownRefresh()
  },

  refresh() {
    const settings = storage.getSettings()
    const streak = storage.validateStreak()
    const todayRecord = storage.getTodayRecord()

    const allRecords = Object.values(storage.getRecords()).flat()
    const customPlans = storage.getCustomPlans()
    const plan = planMod.getPlan(settings.planId, customPlans)
    const planDay = planMod.getPlanDay(settings.planId, allRecords, settings.planStartDate, customPlans)
    const clampedDay = Math.min(planDay, plan.totalDays)
    const target = planMod.getTodayTarget(settings.planId, clampedDay)

    const theme = themeMod.getCurrentTheme()
    // 防御:totalDays 为 0(极端数据损坏)时避免除以 0 得到 NaN
    const planProgress = plan.totalDays > 0 ? Math.round((clampedDay / plan.totalDays) * 100) : 0
    this.setData({
      theme,
      icons: iconsMod.build(theme),
      todayTarget: target,
      todayDone: todayRecord && todayRecord.duration >= target,
      todayDuration: todayRecord ? todayRecord.duration : 0,
      todayTargetText: util.formatTime(target),
      streakCount: streak.count,
      planName: plan.name,
      planDay: clampedDay,
      planTotal: plan.totalDays,
      planProgress
    })
  },

  onStartTrain() {
    wx.navigateTo({ url: '/pages/timer/timer' })
  },

  onFreeTrain() {
    this.setData({ showPicker: true, customInput: '', customDuration: 60 })
  },

  onClosePicker() {
    this.setData({ showPicker: false })
  },

  onSelectPreset(e) {
    const val = e.currentTarget.dataset.value
    this.setData({ customDuration: val, customInput: '' })
  },

  onCustomInput(e) {
    let val = parseInt(e.detail.value) || 0
    if (val > MAX_CUSTOM_DURATION) val = MAX_CUSTOM_DURATION
    this.setData({ customInput: e.detail.value, customDuration: val })
  },

  onConfirmFree() {
    const dur = this.data.customDuration
    if (!dur || dur <= 0) {
      wx.showToast({ title: '请输入有效时长', icon: 'none' })
      return
    }
    if (dur > MAX_CUSTOM_DURATION) {
      wx.showToast({ title: '最大时长为1小时', icon: 'none' })
      return
    }
    this.setData({ showPicker: false })
    wx.navigateTo({ url: `/pages/timer/timer?free=${dur}` })
  }
})