/**
 * 卡若创业派对 - 用户旅程规则引擎
 * 从后端 /api/miniprogram/user-rules 读取启用的规则，按场景触发提示（文案偏利他、少用命令式）
 * 稳定版兼容：readCount 用 getReadCount()，hasPurchasedFull 用 hasFullBook，完善头像跳 avatar-nickname
 *
 * trigger → scene 映射：
 *   注册           → after_login（头像或昵称未完善）
 *   update_avatar / 完善头像 → 仅头像未完善
 *   update_nickname / 修改昵称 → 仅昵称为默认
 *   点击收费章节   → before_read
 *   完成匹配       → after_match
 *   完成付款       → after_pay
 *   累计浏览5章节  → page_show
 *   加入派对房     → before_join_party
 *   绑定微信       → after_bindwechat
 *   收益满50元     → earnings_check
 *   手动触发       → manual
 *   浏览导师页     → browse_mentor
 */

function getAppInstance() {
  try {
    const a = getApp()
    return a && a.globalData ? a : null
  } catch (e) {
    return null
  }
}

const RULE_COOLDOWN_KEY = 'rule_engine_cooldown'
// 0 = 关闭冷却（需求：去掉「操作频繁 / N 分钟」类体感限制）
const COOLDOWN_MS = 0
let _cachedRules = null
let _cacheTs = 0
const CACHE_TTL = 5 * 60 * 1000

const TRIGGER_SCENE_MAP = {
  '注册': 'after_login',
  '完善头像': 'after_login',
  '修改昵称': 'after_login',
  '点击收费章节': 'before_read',
  '完成匹配': 'after_match',
  '完成付款': 'after_pay',
  '发起支付': 'before_pay',
  '累计浏览5章节': 'page_show',
  '加入派对房': 'before_join_party',
  '绑定微信': 'after_bindwechat',
  '收益满50元': 'earnings_check',
  '手动触发': 'manual',
  '浏览导师页': 'browse_mentor',
}

// 与后台「规则类型 trigger」一致：支持英文 key 与同义中文（逻辑在 isRuleEnabled 定义之后）
const TRIGGER_KEYS_AVATAR = ['update_avatar', '完善头像']
const TRIGGER_KEYS_NICKNAME = ['update_nickname', '修改昵称']

function isInCooldown(ruleId) {
  if (!COOLDOWN_MS || COOLDOWN_MS <= 0) return false
  try {
    const map = wx.getStorageSync(RULE_COOLDOWN_KEY) || {}
    const ts = map[ruleId]
    if (!ts) return false
    return Date.now() - ts < COOLDOWN_MS
  } catch (e) {
    console.warn('[RuleEngine] 读取冷却状态失败:', e)
    return false
  }
}

function setCooldown(ruleId) {
  if (!COOLDOWN_MS || COOLDOWN_MS <= 0) return
  try {
    const map = wx.getStorageSync(RULE_COOLDOWN_KEY) || {}
    map[ruleId] = Date.now()
    wx.setStorageSync(RULE_COOLDOWN_KEY, map)
  } catch (e) {
    console.warn('[RuleEngine] 写入冷却状态失败:', e)
  }
}

function getUserInfo() {
  const app = getAppInstance()
  return app ? (app.globalData.userInfo || {}) : {}
}

function trimStr(v) {
  if (v == null || v === undefined) return ''
  const s = String(v).trim()
  return s
}

/** 合并服务端 profile，避免本地 userInfo 未同步导致「已填写仍弹窗」 */
async function fetchProfileMergeUser() {
  const base = { ...getUserInfo() }
  const userId = base.id
  if (!userId) return base
  try {
    const app = getAppInstance()
    const res = await app.request({ url: `/api/miniprogram/user/profile?userId=${userId}`, silent: true })
    if (res?.success && res.data) {
      const d = res.data
      return {
        ...base,
        mbti: d.mbti != null ? d.mbti : base.mbti,
        industry: d.industry != null ? d.industry : base.industry,
        position: d.position != null ? d.position : base.position,
        projectIntro: d.projectIntro || d.project_intro || base.projectIntro,
        phone: d.phone != null ? d.phone : base.phone,
        wechatId: d.wechatId || d.wechat_id || base.wechatId,
      }
    }
  } catch (e) {}
  return base
}

async function loadRules() {
  if (_cachedRules && Date.now() - _cacheTs < CACHE_TTL) return _cachedRules
  const app = getAppInstance()
  if (!app) return _cachedRules || []
  const userId = (app.globalData.userInfo || {}).id || ''
  try {
    const url = userId ? `/api/miniprogram/user-rules?userId=${userId}` : '/api/miniprogram/user-rules'
    const res = await app.request({ url, method: 'GET', silent: true })
    if (res && res.success && res.rules) {
      _cachedRules = res.rules
      _cacheTs = Date.now()
      return _cachedRules
    }
  } catch (e) {
    console.warn('[RuleEngine] 加载规则失败，继续使用缓存:', e)
  }
  return _cachedRules || []
}

function isRuleEnabled(rules, triggerName) {
  return rules.some(r => r.trigger === triggerName && !r.completed)
}

function getRuleInfo(rules, triggerName) {
  return rules.find(r => r.trigger === triggerName && !r.completed)
}

function isAnyTriggerEnabled(rules, keys) {
  return keys.some((k) => isRuleEnabled(rules, k))
}

function getFirstRuleInfo(rules, keys) {
  for (let i = 0; i < keys.length; i++) {
    const info = getRuleInfo(rules, keys[i])
    if (info) return info
  }
  return null
}

function isAvatarMissingOrDefault(user) {
  user = user || getUserInfo()
  const avatar = user.avatar || user.avatarUrl || ''
  return !avatar || avatar.includes('default')
}

function isNicknamePlaceholder(nickname) {
  const n = trimStr(nickname)
  return !n || n === '微信用户' || n.startsWith('微信用户')
}

function markRuleCompleted(ruleId) {
  const userId = getUserInfo().id
  if (!userId || !ruleId) return
  const app = getAppInstance()
  if (!app) return
  const numericId = typeof ruleId === 'number' ? ruleId : null
  if (!numericId) return
  app.request({
    url: '/api/miniprogram/user-rules/complete',
    method: 'POST',
    data: { userId, ruleId: numericId },
    silent: true
  }).catch(() => {})
}

// 仅头像：trigger = update_avatar 或 完善头像
function checkRule_UpdateAvatar(rules) {
  if (!isAnyTriggerEnabled(rules, TRIGGER_KEYS_AVATAR)) return null
  const app = getAppInstance()
  if (app && app.globalData.isVip) return null
  const user = getUserInfo()
  if (!user.id) return null
  if (!isAvatarMissingOrDefault(user)) return null
  if (isInCooldown('update_avatar')) return null
  setCooldown('update_avatar')
  const info = getFirstRuleInfo(rules, TRIGGER_KEYS_AVATAR)
  return {
    ruleId: 'update_avatar',
    serverRuleId: info?.id,
    title: info?.title || '上传头像',
    message: info?.description || '换一张清晰头像，伙伴在名片和匹配里更容易认出你。',
    confirmText: '去设置',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/avatar-nickname/avatar-nickname?focus=avatar'
  }
}

// 仅昵称：trigger = update_nickname 或 修改昵称
function checkRule_UpdateNickname(rules) {
  if (!isAnyTriggerEnabled(rules, TRIGGER_KEYS_NICKNAME)) return null
  const app = getAppInstance()
  if (app && app.globalData.isVip) return null
  const user = getUserInfo()
  if (!user.id) return null
  const nickname = user.nickname || user.nickName || ''
  if (!isNicknamePlaceholder(nickname)) return null
  if (isInCooldown('update_nickname')) return null
  setCooldown('update_nickname')
  const info = getFirstRuleInfo(rules, TRIGGER_KEYS_NICKNAME)
  return {
    ruleId: 'update_nickname',
    serverRuleId: info?.id,
    title: info?.title || '修改昵称',
    message: info?.description || '改一个真实好记的昵称，方便伙伴称呼你。',
    confirmText: '去填写',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/avatar-nickname/avatar-nickname?focus=nickname'
  }
}

// 稳定版：trigger=注册 时头像或昵称任一未完善则引导（与上面两项拆分配置并存）
// VIP 用户不触发：统一由 checkVipContactRequiredAndGuide 跳转 profile-edit，避免与主流程冲突
function checkRule_FillAvatar(rules) {
  if (!isRuleEnabled(rules, '注册')) return null
  const app = getAppInstance()
  if (app && app.globalData.isVip) return null
  const user = getUserInfo()
  if (!user.id) return null
  const nickname = user.nickname || user.nickName || ''
  if (!isAvatarMissingOrDefault(user) && !isNicknamePlaceholder(nickname)) return null
  if (isInCooldown('fill_avatar')) return null
  setCooldown('fill_avatar')
  const info = getRuleInfo(rules, '注册')
  const needNick = isNicknamePlaceholder(nickname)
  const needAv = isAvatarMissingOrDefault(user)
  const focus = needAv && !needNick ? 'avatar' : needNick && !needAv ? 'nickname' : ''
  const qs = focus ? `?focus=${focus}` : ''
  return {
    ruleId: 'fill_avatar',
    serverRuleId: info?.id,
    title: info?.title || '设置头像与昵称',
    message: info?.description || '头像与昵称会展示在名片与匹配卡片上，方便伙伴认出你。',
    confirmText: '去设置',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/avatar-nickname/avatar-nickname' + qs
  }
}

/** 头像/昵称类引导：优先拆条规则（完善头像、修改昵称），其次合并规则（注册） */
function checkAvatarNicknameGuides(rules) {
  return checkRule_UpdateAvatar(rules) || checkRule_UpdateNickname(rules) || checkRule_FillAvatar(rules)
}

function checkRule_BindPhone(rules) {
  if (!isRuleEnabled(rules, '点击收费章节')) return null
  const user = getUserInfo()
  if (!user.id) return null
  if (user.phone) return null
  if (isInCooldown('bind_phone')) return null
  setCooldown('bind_phone')
  const info = getRuleInfo(rules, '点击收费章节')
  return {
    ruleId: 'bind_phone',
    serverRuleId: info?.id,
    title: info?.title || '绑定手机号',
    message: info?.description || '绑定后可用于登录验证、收益与重要通知，账户更安全。',
    confirmText: '去绑定',
    cancelText: '关闭',
    action: 'bind_phone',
    target: null
  }
}

function checkRule_FillProfile(rules, user) {
  if (!isRuleEnabled(rules, '完成匹配')) return null
  user = user || getUserInfo()
  if (!user.id) return null
  const mbti = trimStr(user.mbti)
  const industry = trimStr(user.industry)
  const position = trimStr(user.position)
  if (mbti && industry && position) return null
  if (isInCooldown('fill_profile')) return null
  setCooldown('fill_profile')
  const info = getRuleInfo(rules, '完成匹配')
  return {
    ruleId: 'fill_profile',
    serverRuleId: info?.id,
    title: info?.title || '补充档案信息',
    message: info?.description || '补全 MBTI、行业和职位后，匹配页能更准确地向对方展示你，减少无效沟通。',
    confirmText: '去填写',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/profile-edit/profile-edit'
  }
}

// 稳定版兼容：readCount 用 getReadCount()
function checkRule_ShareAfter5Chapters(rules) {
  if (!isRuleEnabled(rules, '累计浏览5章节')) return null
  const user = getUserInfo()
  if (!user.id) return null
  const app = getAppInstance()
  const readCount = app ? (typeof app.getReadCount === 'function' ? app.getReadCount() : (app.globalData.readCount || 0)) : 0
  if (readCount < 5) return null
  if (isInCooldown('share_after_5')) return null
  setCooldown('share_after_5')
  const info = getRuleInfo(rules, '累计浏览5章节')
  return {
    ruleId: 'share_after_5',
    serverRuleId: info?.id,
    title: info?.title || '邀请好友一起看',
    message: info?.description || '你已阅读 ' + readCount + ' 个章节，好友通过你的分享购买时，你可获得对应分销收益。',
    confirmText: '查看分享',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/referral/referral'
  }
}

// 稳定版兼容：hasPurchasedFull 用 hasFullBook
function checkRule_FillVipInfo(rules, user) {
  if (!isRuleEnabled(rules, '完成付款')) return null
  user = user || getUserInfo()
  if (!user.id) return null
  const app = getAppInstance()
  if (!app || !(app.globalData.hasFullBook || app.globalData.hasPurchasedFull)) return null
  const wxId = trimStr(user.wechatId || user.wechat_id)
  const addr = trimStr(user.address)
  if (wxId && addr) return null
  if (isInCooldown('fill_vip_info')) return null
  setCooldown('fill_vip_info')
  const info = getRuleInfo(rules, '完成付款')
  return {
    ruleId: 'fill_vip_info',
    serverRuleId: info?.id,
    title: info?.title || '补全 VIP 资料',
    message: info?.description || '补全微信号与收货地址等信息，便于进入 VIP 群、寄送物料与售后联系。',
    confirmText: '去填写',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/profile-edit/profile-edit'
  }
}

function checkRule_JoinParty(rules, user) {
  if (!isRuleEnabled(rules, '加入派对房')) return null
  user = user || getUserInfo()
  if (!user.id) return null
  if (trimStr(user.projectIntro)) return null
  if (isInCooldown('join_party')) return null
  setCooldown('join_party')
  const info = getRuleInfo(rules, '加入派对房')
  return {
    ruleId: 'join_party',
    serverRuleId: info?.id,
    title: info?.title || '补充项目介绍',
    message: info?.description || '用简短文字说明项目与需求，派对房里的伙伴能更快判断是否与你有合作空间。',
    confirmText: '去填写',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/profile-edit/profile-edit'
  }
}

function checkRule_BindWechat(rules) {
  if (!isRuleEnabled(rules, '绑定微信')) return null
  const user = getUserInfo()
  if (!user.id) return null
  if (trimStr(user.wechatId || user.wechat_id)) return null
  if (isInCooldown('bind_wechat')) return null
  setCooldown('bind_wechat')
  const info = getRuleInfo(rules, '绑定微信')
  return {
    ruleId: 'bind_wechat',
    serverRuleId: info?.id,
    title: info?.title || '绑定微信号',
    message: info?.description || '绑定后可用于分销结算、提现核对与重要通知。',
    confirmText: '去设置',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/settings/settings'
  }
}

function checkRule_Withdraw(rules) {
  if (!isRuleEnabled(rules, '收益满50元')) return null
  const user = getUserInfo()
  if (!user.id) return null
  const app = getAppInstance()
  const earnings = app ? (app.globalData.totalEarnings || 0) : 0
  if (earnings < 50) return null
  if (isInCooldown('withdraw_50')) return null
  setCooldown('withdraw_50')
  const info = getRuleInfo(rules, '收益满50元')
  return {
    ruleId: 'withdraw_50',
    serverRuleId: info?.id,
    title: info?.title || '可以提现了',
    message: info?.description || '累计分销收益已达到提现条件，可在推荐收益页发起提现到微信零钱。',
    confirmText: '去查看',
    cancelText: '关闭',
    action: 'navigate',
    target: '/pages/referral/referral'
  }
}

function checkRulesSync(scene, rules) {
  const user = getUserInfo()
  if (!user.id) return null

  switch (scene) {
    case 'after_login':
      return checkAvatarNicknameGuides(rules)
    case 'before_read':
      return checkRule_BindPhone(rules) || checkAvatarNicknameGuides(rules)
    case 'before_pay':
      return checkAvatarNicknameGuides(rules) || checkRule_BindPhone(rules) || checkRule_FillProfile(rules)
    case 'after_match':
      return null
    case 'after_pay':
      return checkRule_FillVipInfo(rules) || checkRule_FillProfile(rules)
    case 'page_show':
      return checkAvatarNicknameGuides(rules) || checkRule_ShareAfter5Chapters(rules) || checkRule_BindWechat(rules) || checkRule_Withdraw(rules)
    case 'before_join_party':
      return checkRule_JoinParty(rules)
    default:
      return null
  }
}

function executeRule(rule, pageInstance) {
  if (!rule) return

  wx.showModal({
    title: rule.title,
    content: rule.message,
    confirmText: rule.confirmText || '去填写',
    cancelText: rule.cancelText !== undefined ? rule.cancelText : '关闭',
    success: (res) => {
      if (res.confirm) {
        if (rule.action === 'navigate' && rule.target) {
          wx.navigateTo({ url: rule.target })
        } else if (rule.action === 'bind_phone' && pageInstance) {
          if (typeof pageInstance.showPhoneBinding === 'function') {
            pageInstance.showPhoneBinding()
          }
        }
        if (rule.serverRuleId) {
          markRuleCompleted(rule.serverRuleId)
        }
      }
      _trackRuleAction(rule.ruleId, res.confirm ? 'confirm' : 'cancel')
    }
  })
}

function _trackRuleAction(ruleId, action) {
  const userId = getUserInfo().id
  if (!userId) return
  const app = getAppInstance()
  if (!app) return
  app.request({
    url: '/api/miniprogram/track',
    method: 'POST',
    data: { userId, action: 'rule_trigger', target: ruleId, extraData: { result: action } },
    silent: true
  }).catch(() => {})
}

async function checkAndExecute(scene, pageInstance) {
  const rules = await loadRules()
  let rule = null
  if (scene === 'after_match') {
    const u = await fetchProfileMergeUser()
    rule = checkRule_FillProfile(rules, u) || checkRule_JoinParty(rules, u)
  } else {
    rule = checkRulesSync(scene, rules)
  }
  if (rule) {
    setTimeout(() => executeRule(rule, pageInstance), 800)
  }
}

module.exports = { checkRules: checkRulesSync, executeRule, checkAndExecute, loadRules, markRuleCompleted }