// settings.js
const storage = require('../../utils/storage')

const LAST_BACKUP_KEY = 'lastBackupAt'

function formatRelativeTime(ts) {
  if (!ts) return '从未备份'
  const diff = Date.now() - ts
  if (diff < 60 * 1000) return '刚刚'
  if (diff < 60 * 60 * 1000) return Math.floor(diff / 60000) + ' 分钟前'
  if (diff < 24 * 60 * 60 * 1000) return Math.floor(diff / 3600000) + ' 小时前'
  if (diff < 30 * 24 * 60 * 60 * 1000) return Math.floor(diff / 86400000) + ' 天前'
  const d = new Date(ts)
  return (d.getMonth() + 1) + '月' + d.getDate() + '日'
}

Page({
  data: {
    personsCount: 0,
    anniversariesCount: 0,
    lastBackupText: '从未备份',
    version: 'v2.1.4'
  },

  onLoad() {
    this.loadSummary()
  },

  onShow() {
    this.loadSummary()
  },

  loadSummary() {
    const persons = storage.getPersons()
    const anniversaries = storage.getAnniversaries()
    const lastBackupAt = wx.getStorageSync(LAST_BACKUP_KEY) || 0

    this.setData({
      personsCount: persons.length,
      anniversariesCount: anniversaries.length,
      lastBackupText: formatRelativeTime(lastBackupAt)
    })
  },

  onExportData() {
    const data = storage.exportData()
    const jsonStr = JSON.stringify(data, null, 2)

    wx.setClipboardData({
      data: jsonStr,
      success: () => {
        wx.setStorageSync(LAST_BACKUP_KEY, Date.now())
        this.loadSummary()
        wx.showToast({
          title: '数据已复制到剪贴板',
          icon: 'success'
        })
      }
    })
  },

  onImportData() {
    wx.showModal({
      title: '导入数据',
      content: '将从剪贴板读取数据并导入。注意：导入会覆盖现有数据，请先备份！',
      confirmText: '确认导入',
      cancelText: '取消',
      success: (res) => {
        if (res.confirm) {
          wx.getClipboardData({
            success: (res) => {
              try {
                const data = JSON.parse(res.data)
                const result = storage.importData(data)

                if (result.success) {
                  wx.showToast({ title: '导入成功', icon: 'success' })
                  setTimeout(() => wx.reLaunch({ url: '/pages/index/index' }), 1500)
                } else {
                  wx.showToast({ title: result.error || '导入失败，请检查数据格式', icon: 'none' })
                }
              } catch (e) {
                wx.showToast({ title: '数据格式错误', icon: 'none' })
              }
            }
          })
        }
      }
    })
  },

  onClearData() {
    wx.showModal({
      title: '确认清空',
      content: '确定要清空所有数据吗？此操作不可恢复！',
      confirmText: '确认清空',
      confirmColor: '#C8412F',
      success: (res) => {
        if (res.confirm) {
          const success = storage.clearAllData()
          if (success) {
            wx.showToast({
              title: '已清空',
              icon: 'success'
            })
            setTimeout(() => {
              wx.reLaunch({
                url: '/pages/index/index'
              })
            }, 1500)
          }
        }
      }
    })
  }
})