/**
 * Soul创业派对 - 目录页
 * 开发: 卡若
 * 技术支持: 存客宝
 * 数据: 完整真实文章标题
 */

const app = getApp()
const PART_NUMBERS = { 'part-1': '一', 'part-2': '二', 'part-3': '三', 'part-4': '四', 'part-5': '五' }

function buildNestedBookData(list) {
  const parts = {}
  const appendices = []
  let epilogueMid = 0
  let prefaceMid = 0
  list.forEach(ch => {
    if (ch.id === 'preface') {
      prefaceMid = ch.mid || 0
      return
    }
    const section = {
      id: ch.id,
      mid: ch.mid || 0,
      title: ch.sectionTitle || ch.chapterTitle || ch.id,
      isFree: !!ch.isFree,
      price: ch.price != null ? Number(ch.price) : 1
    }
    if (ch.id === 'epilogue') {
      epilogueMid = ch.mid || 0
      return
    }
    if ((ch.id || '').startsWith('appendix')) {
      appendices.push({ id: ch.id, mid: ch.mid || 0, title: ch.sectionTitle || ch.chapterTitle || ch.id })
      return
    }
    if (!ch.partId || ch.id === 'preface') return
    const pid = ch.partId
    const cid = ch.chapterId || 'chapter-' + (ch.id || '').split('.')[0]
    if (!parts[pid]) {
      parts[pid] = { id: pid, number: PART_NUMBERS[pid] || pid, title: ch.partTitle || pid, subtitle: ch.chapterTitle || '', chapters: {} }
    }
    if (!parts[pid].chapters[cid]) {
      parts[pid].chapters[cid] = { id: cid, title: ch.chapterTitle || cid, sections: [] }
    }
    parts[pid].chapters[cid].sections.push(section)
  })
  const bookData = Object.values(parts)
    .sort((a, b) => (a.id || '').localeCompare(b.id || ''))
    .map(p => ({
      ...p,
      chapters: Object.values(p.chapters).sort((a, b) => (a.id || '').localeCompare(b.id || ''))
    }))
  return { bookData, appendixList: appendices, epilogueMid, prefaceMid }
}

Page({
  data: {
    statusBarHeight: 44,
    navBarHeight: 88,
    isLoggedIn: false,
    hasFullBook: false,
    purchasedSections: [],
    totalSections: 62,
    bookData: [],
    expandedPart: null,
    appendixList: [],
    epilogueMid: 0,
    prefaceMid: 0
  },

  onLoad() {
    this.setData({
      statusBarHeight: app.globalData.statusBarHeight,
      navBarHeight: app.globalData.navBarHeight
    })
    this.updateUserStatus()
    this.loadAndEnrichBookData()
  },

  async loadAndEnrichBookData() {
    try {
      let list = app.globalData.bookData || []
      if (!list.length) {
        const res = await app.request('/api/miniprogram/book/all-chapters')
        if (res?.data) {
          list = res.data
          app.globalData.bookData = list
        }
      }
      if (!list.length) {
        this.setData({ bookData: [], appendixList: [] })
        return
      }
      const { bookData, appendixList, epilogueMid, prefaceMid } = buildNestedBookData(list)
      const firstPartId = bookData[0]?.id || null
      this.setData({
        bookData,
        appendixList,
        epilogueMid,
        prefaceMid,
        totalSections: list.length,
        expandedPart: firstPartId || this.data.expandedPart
      })
    } catch (e) {
      console.error('[Chapters] 加载目录失败:', e)
      this.setData({ bookData: [], appendixList: [] })
    }
  },

  onShow() {
    this.updateUserStatus()
    if (!app.globalData.bookData?.length) {
      this.loadAndEnrichBookData()
    }
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      const tabBar = this.getTabBar()
      if (tabBar.updateSelected) {
        tabBar.updateSelected()
      } else {
        tabBar.setData({ selected: 1 })
      }
    }
  },

  // 更新用户状态
  updateUserStatus() {
    const { isLoggedIn, hasFullBook, purchasedSections } = app.globalData
    this.setData({ isLoggedIn, hasFullBook, purchasedSections })
  },

  // 切换展开状态
  togglePart(e) {
    const partId = e.currentTarget.dataset.id
    this.setData({
      expandedPart: this.data.expandedPart === partId ? null : partId
    })
  },

  goToRead(e) {
    const id = e.currentTarget.dataset.id
    const mid = e.currentTarget.dataset.mid || app.getSectionMid(id)
    const q = mid ? `mid=${mid}` : `id=${id}`
    wx.navigateTo({ url: `/pages/read/read?${q}` })
  },

  // 检查是否已购买
  hasPurchased(sectionId) {
    if (this.data.hasFullBook) return true
    return this.data.purchasedSections.includes(sectionId)
  },

  // 返回首页
  goBack() {
    wx.switchTab({ url: '/pages/index/index' })
  },

  // 跳转到搜索页
  goToSearch() {
    wx.navigateTo({ url: '/pages/search/search' })
  },

  onShareAppMessage() {
    const ref = app.getMyReferralCode()
    return {
      title: 'Soul创业派对 - 目录',
      path: ref ? `/pages/chapters/chapters?ref=${ref}` : '/pages/chapters/chapters'
    }
  }
})