// index.js
const storage = require('../../utils/storage')
const dateUtils = require('../../utils/date')
const { TYPE_NAMES } = require('../../utils/constants')

Page({
  data: {
    persons: [],
    originalPersons: [],
    searchKeyword: '',
    currentFilter: 'all',
    totalCount: 0,
    upcomingCount: 0,
    todayText: ''
  },

  onLoad() {
    this.loadPersons()
  },

  onShow() {
    this.loadPersons()
  },

  /**
   * 加载人员列表
   */
  loadPersons() {
    const persons = storage.getPersons()
    const anniversaries = storage.getAnniversaries()

    const personsWithAnniversaries = persons.map(person => {
      const personAnniversaries = anniversaries.filter(a => a.personId === person.id)

      let nextAnniversary = null
      if (personAnniversaries.length > 0) {
        const upcoming = personAnniversaries
          .map(a => {
            const { date, daysUntil } = dateUtils.getNextOccurrence(a.solarMonth, a.solarDay)
            return { ...a, date, daysUntil }
          })
          .sort((a, b) => a.daysUntil - b.daysUntil)

        if (upcoming.length > 0) {
          const next = upcoming[0]
          nextAnniversary = {
            type: next.type,
            typeName: this.getTypeName(next.type, next.customTypeName),
            dateText: dateUtils.formatDate(next.date, 'MM月DD日'),
            daysUntil: next.daysUntil,
            daysUntilText: this.formatDaysUntil(next.daysUntil)
          }
        }
      }

      return { ...person, anniversaryCount: personAnniversaries.length, nextAnniversary }
    })

    const sorted = personsWithAnniversaries.sort((a, b) => {
      if (!a.nextAnniversary && !b.nextAnniversary) return 0
      if (!a.nextAnniversary) return 1
      if (!b.nextAnniversary) return -1
      return a.nextAnniversary.daysUntil - b.nextAnniversary.daysUntil
    })

    const today = new Date()
    const weekdays = ['日', '一', '二', '三', '四', '五', '六']
    const todayText = `${today.getMonth() + 1}月${today.getDate()}日 周${weekdays[today.getDay()]}`
    const upcomingCount = sorted.filter(p => p.nextAnniversary && p.nextAnniversary.daysUntil <= 7).length

    this.setData({ originalPersons: sorted, totalCount: sorted.length, upcomingCount, todayText })

    if (this.data.currentFilter === 'all' && !this.data.searchKeyword) {
      this.setData({ persons: sorted })
    } else {
      this.filterPersons()
    }
  },

  /**
   * 格式化剩余天数
   */
  formatDaysUntil(days) {
    if (days === 0) return '今天'
    if (days === 1) return '明天'
    if (days < 7) return `${days}天后`
    if (days < 30) return `还有${Math.floor(days / 7)}周`
    return `还有${Math.floor(days / 30)}个月`
  },

  /**
   * 获取类型名称
   */
  getTypeName(type, customName) {
    if (type === 'other' && customName) return customName
    return TYPE_NAMES[type] || '纪念日'
  },

  /**
   * 搜索输入
   */
  onSearchInput(e) {
    const keyword = e.detail.value
    this.setData({ searchKeyword: keyword })
    this.filterPersons()
  },

  /**
   * 筛选切换
   */
  onFilterTap(e) {
    const filter = e.currentTarget.dataset.filter
    this.setData({ currentFilter: filter }, () => {
      this.filterPersons()
    })
  },

  /**
   * 筛选人员
   */
  filterPersons() {
    const { originalPersons, searchKeyword, currentFilter } = this.data
    const anniversaries = storage.getAnniversaries()
    
    let filtered = [...originalPersons]

    // 关键词搜索
    if (searchKeyword) {
      filtered = filtered.filter(p => 
        p.name.includes(searchKeyword) || 
        (p.nickname && p.nickname.includes(searchKeyword))
      )
    }

    // 类型筛选
    if (currentFilter !== 'all') {
      filtered = filtered.filter(person => {
        const personAnniversaries = anniversaries.filter(a => a.personId === person.id)
        
        if (currentFilter === 'birthday') {
          // 生日筛选：只显示有生日类型的人（公历生日或农历生日）
          return personAnniversaries.some(a => 
            a.type === 'birthday' || a.type === 'lunar_birthday'
          )
        } else if (currentFilter === 'anniversary') {
          // 纪念日筛选：只显示有纪念日类型的人（结婚、订婚、其他）
          return personAnniversaries.some(a => 
            a.type === 'wedding' || a.type === 'engagement' || a.type === 'other'
          )
        } else if (currentFilter === 'upcoming') {
          // 即将到来：只显示7天内有纪念日的人
          return person.nextAnniversary && person.nextAnniversary.daysUntil <= 7
        }
        
        return true
      })
    }

    // 排序：与 loadPersons() 保持一致，按最近的纪念日排序
    const sorted = filtered.sort((a, b) => {
      if (!a.nextAnniversary && !b.nextAnniversary) return 0
      if (!a.nextAnniversary) return 1
      if (!b.nextAnniversary) return -1
      return a.nextAnniversary.daysUntil - b.nextAnniversary.daysUntil
    })

    this.setData({ persons: sorted })
  },

  /**
   * 点击人员
   */
  onPersonTap(e) {
    const id = e.currentTarget.dataset.id
    wx.navigateTo({
      url: `/pages/person-detail/person-detail?id=${id}`
    })
  },

  /**
   * 点击添加按钮
   */
  onAddTap() {
    wx.showActionSheet({
      itemList: ['添加人员', '添加纪念日'],
      success: (res) => {
        if (res.tapIndex === 0) {
          wx.navigateTo({
            url: '/pages/add-person/add-person'
          })
        } else if (res.tapIndex === 1) {
          wx.navigateTo({
            url: '/pages/add-anniversary/add-anniversary'
          })
        }
      }
    })
  }
})