const memoryCards = require('../../data/memoryCards')
const { chapterRoute } = require('../../utils/chapterRoute')

const MEMORY_CARD_ID_PATTERN = /^S\d{2}-C\d{2}-MC\d{2}$/
const INVALID_CARD_MESSAGE = '这张桂香记忆卡暂时没有找到。回到封面，还可以慢慢翻一回。'
const SHARE_PREVIEW_IMAGE = '/assets/share/guixiang-story-share-preview-v1.jpg'

function memoryCardSharePath(memoryCard) {
  const cardId = String(memoryCard && memoryCard.cardId || '').trim()
  if (!cardId) return '/pages/home/home'
  return `/pages/share/share?cardId=${encodeURIComponent(cardId)}&source=family-memory`
}

function normalizeCardId(value) {
  const raw = String(value || '').trim()
  if (!raw || raw.length > 64) return ''
  let decoded = raw
  try {
    decoded = decodeURIComponent(raw)
  } catch (error) {
    return ''
  }
  return MEMORY_CARD_ID_PATTERN.test(decoded) ? decoded : ''
}

function findMemoryCard(value) {
  const cardId = normalizeCardId(value)
  if (!cardId) return null
  return memoryCards.find((card) => card.cardId === cardId) || null
}

function twoDigits(value) {
  return String(value).padStart(2, '0')
}

Page({
  data: {
    memoryCard: null,
    chapterLabel: '',
    characterInitial: '',
    invalidCard: false,
    invalidCardMessage: INVALID_CARD_MESSAGE,
  },

  onLoad(options = {}) {
    const memoryCard = findMemoryCard(options.cardId)
    if (!memoryCard) {
      this.setData({
        memoryCard: null,
        chapterLabel: '',
        characterInitial: '',
        invalidCard: true,
      })
      return
    }
    this.setData({
      memoryCard: { ...memoryCard },
      chapterLabel: `第${twoDigits(memoryCard.chapterNumber)}回`,
      characterInitial: String(memoryCard.characterName || '桂').slice(0, 1),
      invalidCard: false,
    })
  },

  openChapter() {
    const memoryCard = this.data.memoryCard
    if (!memoryCard || !memoryCard.chapterNumber) {
      this.goHome()
      return
    }
    wx.navigateTo({
      url: chapterRoute(memoryCard.chapterNumber),
    })
  },

  goHome() {
    const target = { url: '/pages/home/home' }
    if (typeof wx.reLaunch === 'function') {
      wx.reLaunch(target)
      return
    }
    wx.redirectTo(target)
  },

  onShareAppMessage() {
    const memoryCard = this.data.memoryCard
    if (!memoryCard) {
      return {
        title: '唐侦探：饭桌边，也有值得带回家说的话',
        path: '/pages/home/home',
        imageUrl: SHARE_PREVIEW_IMAGE,
      }
    }
    return {
      title: `带回家的一句话：${memoryCard.familyLine}`,
      path: memoryCardSharePath(memoryCard),
      imageUrl: SHARE_PREVIEW_IMAGE,
    }
  },

  onShareTimeline() {
    const memoryCard = this.data.memoryCard
    return memoryCard
      ? {
          title: `桂香记忆：${memoryCard.tableEcho}`,
          query: `cardId=${encodeURIComponent(memoryCard.cardId)}&source=family-memory`,
        }
      : {
          title: '唐侦探：饭桌边，也有值得带回家说的话',
          query: '',
        }
  },
})