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

Page({
  data: {
    theme: { primary: '#FF6B35', primaryLight: '#FF8C5A', primaryBg: '#FFF3ED', primaryRgb: '255,107,53' },
    themeStyle: themeMod.BASE_VARS,
    loading: true,
    totalDuration: 0,
    totalDurationText: '',
    totalSessions: 0,
    maxDuration: 0,
    maxDurationText: '',
    currentYear: new Date().getFullYear(),
    currentMonth: new Date().getMonth() + 1,
    monthRecords: [],
    historyList: [],
    listMode: 'month',
    trendMode: 'week',
    trendData: [],
    showDayDetail: false,
    dayDetail: {},
    icons: iconsMod.build()
  },

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

  onShow() {
    themeMod.applyThemeToPage(this)
    try {
      const tb = this.getTabBar()
      if (tb) tb.setData({ selected: 1 })
    } catch (e) {}
    if (this._firstShow) {
      this._firstShow = false
      this.refresh()
      return
    }
    this.refresh()
  },

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

  refresh() {
    storage.validateStreak()
    const stats = storage.getTotalStats()
    const monthKey = `${this.data.currentYear}-${String(this.data.currentMonth).padStart(2, '0')}`
    const records = (storage.getRecordsByMonth(monthKey) || []).map(r => ({ ...r, durationText: util.formatTime(r.duration) }))

    // Each month is already sorted newest-first in storage. To get top 30 most recent,
    // walk months in reverse chrono order and concat — O(months*30) instead of O(n log n).
    const byMonth = storage.getRecords()
    const monthKeys = Object.keys(byMonth).sort().reverse()
    const historyList = []
    for (const mk of monthKeys) {
      for (const r of byMonth[mk]) {
        historyList.push({ ...r, durationText: util.formatTime(r.duration) })
        if (historyList.length >= 30) break
      }
      if (historyList.length >= 30) break
    }

    const theme = themeMod.getCurrentTheme()
    this.setData({
      theme,
      icons: iconsMod.build(theme),
      totalDuration: stats.totalDuration,
      totalDurationText: util.formatDuration(stats.totalDuration),
      totalSessions: stats.totalSessions,
      maxDuration: stats.maxDuration,
      maxDurationText: util.formatDuration(stats.maxDuration),
      monthRecords: records,
      historyList,
      listMode: this.data.listMode || 'month',
      displayList: (this.data.listMode || 'month') === 'month' ? records : historyList,
      trendData: this._computeTrend(this.data.trendMode || 'week'),
      loading: false
    })
  },

  onPrevMonth() {
    let { currentYear, currentMonth } = this.data
    if (currentMonth === 1) {
      currentYear--
      currentMonth = 12
    } else {
      currentMonth--
    }
    this.setData({ currentYear, currentMonth })
    this.refresh()
  },

  onNextMonth() {
    let { currentYear, currentMonth } = this.data
    if (currentMonth === 12) {
      currentYear++
      currentMonth = 1
    } else {
      currentMonth++
    }
    this.setData({ currentYear, currentMonth })
    this.refresh()
  },

  onToggleListMode(e) {
    const mode = e.currentTarget.dataset.mode
    if (!mode || mode === this.data.listMode) return
    this.setData({ listMode: mode })
    this.refresh()
  },

  onToggleTrendMode(e) {
    const mode = e.currentTarget.dataset.mode
    if (!mode || mode === this.data.trendMode) return
    this.setData({ trendMode: mode, trendData: this._computeTrend(mode) })
  },

  /**
   * 训练趋势数据:
   *   week  - 近 7 天每天的训练时长(秒)
   *   month - 近 6 个月每月的训练时长(秒)
   * 返回 [{ label, value, valueText, highlight }] 供 trend-chart 渲染。
   */
  _computeTrend(mode) {
    const allRecords = Object.values(storage.getRecords()).flat()
    const today = new Date()
    const weekdays = ['日', '一', '二', '三', '四', '五', '六']
    const pad = (n) => String(n).padStart(2, '0')

    if (mode === 'month') {
      const data = []
      for (let i = 5; i >= 0; i--) {
        const d = new Date(today.getFullYear(), today.getMonth() - i, 1)
        const monthKey = `${d.getFullYear()}-${pad(d.getMonth() + 1)}`
        const monthRecords = storage.getRecordsByMonth(monthKey) || []
        const total = monthRecords.reduce((s, r) => s + (Number(r.duration) || 0), 0)
        data.push({
          label: `${d.getMonth() + 1}月`,
          value: total,
          valueText: total > 0 ? util.formatDuration(total) : '',
          highlight: i === 0
        })
      }
      return data
    }

    // default: week (近 7 天)
    const data = []
    for (let i = 6; i >= 0; i--) {
      const d = new Date(today)
      d.setDate(d.getDate() - i)
      const dateStr = `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`
      const total = allRecords
        .filter((r) => util.dateOnly(r.date) === dateStr)
        .reduce((s, r) => s + (Number(r.duration) || 0), 0)
      const isToday = i === 0
      data.push({
        label: isToday ? '今天' : weekdays[d.getDay()],
        value: total,
        valueText: total > 0 ? util.formatDuration(total) : '',
        highlight: isToday
      })
    }
    return data
  },

  onDayTap(e) {
    const { year, month, day } = e.detail
    const dateStr = `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`
    const allRecords = Object.values(storage.getRecords()).flat()
    // record.date 是 "YYYY-MM-DD HH:MM:SS"(formatDate 生成),dateStr 只有
    // 日期部分,直接 === 永远不匹配,必须用 dateOnly 截取后再比。
    const sessions = allRecords.filter(r => util.dateOnly(r.date) === dateStr)
    const totalDur = sessions.reduce((sum, r) => sum + r.duration, 0)
    const calories = Math.round(totalDur * 0.068)
    this.setData({
      showDayDetail: true,
      dayDetail: {
        date: dateStr,
        sessions: sessions.length,
        duration: totalDur,
        durationText: util.formatDuration(totalDur),
        calories
      }
    })
  },

  onCloseDayDetail() {
    this.setData({ showDayDetail: false })
  },

  // Swallow touchmove on the popup so the background page doesn't scroll.
  onNoop() { /* swallow */ },

  onLongPressDelete(e) {
    this.onDeleteRecord(e)
  },

  onDeleteRecord(e) {
    const id = e.currentTarget.dataset.id
    if (!id && id !== 0) {
      wx.showToast({ title: '记录数据异常', icon: 'none', duration: 1200 })
      return
    }
    wx.showModal({
      title: '删除记录',
      content: '确定要删除这条训练记录吗？',
      success: (res) => {
        if (res.confirm) {
          storage.deleteRecord(id)
          this.refresh()
          wx.showToast({ title: '已删除', icon: 'none', duration: 1200 })
        }
      }
    })
  },

  /**
   * 分享给朋友 — 训练记录页。把累计训练时长带进标题,
   * 让分享卡片有点击欲(看到对方"已经练了 X 小时"会想点开)。
   */
  onShareAppMessage() {
    const stats = storage.getTotalStats()
    const minutes = Math.round((stats.totalDuration || 0) / 60)
    const s = config.share.records
    return {
      title: s.titleTemplate.replace('{minutes}', minutes),
      path: s.path
    }
  },

  /**
   * 分享到朋友圈。
   */
  onShareTimeline() {
    return {
      title: config.share.timelineTitle
    }
  }
})