const app = getApp()

const GUEST_TRACK_STORAGE_KEY = 'guest_track_id_v1'

/**
 * 未登录访客设备标识：持久化，用于埋点区分「人」——避免全部为 anonymous 导致后台只统计到 1 人
 */
function getGuestTrackId() {
  try {
    let id = wx.getStorageSync(GUEST_TRACK_STORAGE_KEY)
    id = typeof id === 'string' ? id.trim() : ''
    if (id.length >= 12) return id
    id = 'gt_' + Date.now().toString(36) + '_' + Math.random().toString(36).slice(2, 14)
    wx.setStorageSync(GUEST_TRACK_STORAGE_KEY, id)
    return id
  } catch (_) {
    return 'gt_fallback_local'
  }
}

function sendMiniprogramTrack(data) {
  return app.request('/api/miniprogram/track', {
    method: 'POST',
    data,
    silent: true
  })
}

/**
 * 全局按钮/标签点击埋点（未登录也上报，携带 guestId）
 * @param {string} module  模块：home|chapters|read|my|vip|wallet|match|referral|search|settings|about
 * @param {string} action  行为：tab_click|btn_click|nav_click|card_click|link_click 等
 * @param {string} target  目标标识：按钮文案、章节ID、标签名等
 * @param {object} [extra] 附加数据
 */
function trackClick(module, action, target, extra) {
  const userId = app.globalData.userInfo?.id || ''
  const payload = {
    action,
    target,
    extraData: Object.assign({ module, page: module }, extra || {})
  }
  if (userId) {
    payload.userId = userId
  } else {
    payload.guestId = getGuestTrackId()
  }
  sendMiniprogramTrack(payload).catch(() => {})
}

/**
 * 章节 PV：写入 user_tracks.action=view_chapter；未登录携带 guestId
 */
function trackViewChapter(sectionId, extra) {
  const id = String(sectionId || '').trim()
  if (!id) return
  const userId = app.globalData.userInfo?.id || ''
  const payload = {
    action: 'view_chapter',
    target: id,
    extraData: Object.assign({ page: 'read', module: 'read' }, extra || {})
  }
  if (userId) {
    payload.userId = userId
  } else {
    payload.guestId = getGuestTrackId()
  }
  sendMiniprogramTrack(payload).catch(() => {})
}

module.exports = { trackClick, trackViewChapter, getGuestTrackId }