const express = require('express')
const db = require('../lib/db')
const wechat = require('../lib/wechat')
const { uploader } = require('../lib/upload')
const { userAuth, requireUserAdmin } = require('../lib/auth')
const { HttpError, uid, token, ok, fail, wrap, str, has, PHONE_RE } = require('../lib/http')
const {
  publicActivity,
  currentActivity,
  pastActivities,
  nextPastTheme,
  setPinned,
  publicProfile,
  DEFAULT_BRAND
} = require('../lib/serialize')

const router = express.Router()

router.post(
  '/login',
  wrap(async (req, res) => {
    const body = req.body || {}
    const code = str(body.code)
    if (!code) throw new HttpError(400, '缺少 code')
    const session = await wechat.code2session(code, str(body.deviceId))

    const profile = db.update((data) => {
      let user = data.users.find((item) => item.openid === session.openid)
      if (!user) {
        user = {
          openid: session.openid,
          nickName: '',
          avatarUrl: '',
          name: '',
          phone: '',
          company: '',
          position: '',
          createdAt: new Date().toISOString()
        }
        data.users.push(user)
      }
      user.token = token()
      return Object.assign({ token: user.token, demo: session.demo }, publicProfile(user, data))
    })
    ok(res, profile)
  })
)

router.get('/user/profile', userAuth, (req, res) => {
  ok(res, publicProfile(req.user))
})

const PROFILE_LIMITS = { nickName: 32, name: 20, phone: 11, company: 40, position: 40 }

router.post('/user/profile', userAuth, (req, res) => {
  const body = req.body || {}
  if (has(body, 'phone') && str(body.phone) && !PHONE_RE.test(str(body.phone))) {
    return fail(res, 400, '请填写正确的手机号')
  }
  const profile = db.update((data) => {
    const user = req.user
    Object.keys(PROFILE_LIMITS).forEach((key) => {
      if (has(body, key)) user[key] = str(body[key], PROFILE_LIMITS[key])
    })
    // Only server-hosted avatars are accepted; temp paths like http://tmp/... are useless to others.
    const avatarUrl = str(body.avatarUrl)
    if (avatarUrl && avatarUrl.startsWith('/static/uploads/')) user.avatarUrl = avatarUrl
    return publicProfile(user, data)
  })
  ok(res, profile)
})

router.post('/user/avatar', userAuth, uploader({ imagesOnly: true }))

router.get('/activity/current', (req, res) => {
  const data = db.read()
  const activity = currentActivity(data)
  ok(res, activity ? publicActivity(activity, data.posters) : null)
})

router.get('/activity/past', (req, res) => {
  const data = db.read()
  ok(res, pastActivities(data).map((item) => publicActivity(item, data.posters)))
})

router.get('/activity/:id', (req, res) => {
  const data = db.read()
  const activity = data.activities.find((item) => item.id === req.params.id && item.status !== 'draft')
  if (!activity) return fail(res, 404, '活动不存在')
  ok(res, publicActivity(activity, data.posters))
})

router.post('/activity/past', userAuth, requireUserAdmin, (req, res) => {
  const body = req.body || {}
  const title = str(body.title, 40)
  const startAt = str(body.startAt, 32)
  if (!title || !startAt) return fail(res, 400, '请填写名称和时间')
  const activity = db.update((data) => {
    const now = new Date().toISOString()
    const next = {
      id: uid('p'),
      title,
      brandName: DEFAULT_BRAND,
      brandDesc: '',
      cover: str(body.cover),
      video: str(body.video),
      startAt,
      address: '',
      latitude: null,
      longitude: null,
      status: 'past',
      isCurrent: false,
      pinned: false,
      pinnedAt: '',
      theme: nextPastTheme(data),
      createdAt: now,
      updatedAt: now
    }
    if (body.pinned) setPinned(next, true)
    data.activities.push(next)
    return next
  })
  ok(res, publicActivity(activity))
})

function findPast(data, id) {
  return data.activities.find((item) => item.id === id && item.status === 'past')
}

router.post('/activity/past/:id/pin', userAuth, requireUserAdmin, (req, res) => {
  const updated = db.update((data) => {
    const activity = findPast(data, req.params.id)
    return activity ? setPinned(activity, !!(req.body && req.body.pinned)) : null
  })
  if (!updated) return fail(res, 404, '往期活动不存在')
  ok(res, publicActivity(updated))
})

router.delete('/activity/past/:id', userAuth, requireUserAdmin, (req, res) => {
  const removed = db.update((data) => {
    const activity = findPast(data, req.params.id)
    if (!activity) return null
    data.activities = data.activities.filter((item) => item.id !== activity.id)
    data.posters = data.posters.filter((item) => item.activityId !== activity.id)
    return activity.id
  })
  if (!removed) return fail(res, 404, '往期活动不存在')
  ok(res, { id: removed })
})

router.post('/signup', userAuth, (req, res) => {
  const body = req.body || {}
  const activityId = str(body.activityId)
  const name = str(body.name, 20)
  const phone = str(body.phone)
  let sourceSharer = str(body.sourceSharer, 64)
  if (!activityId || !name || !phone) return fail(res, 400, '请填写姓名和手机号')
  if (!PHONE_RE.test(phone)) return fail(res, 400, '请填写正确的手机号')
  if (sourceSharer === req.user.openid) sourceSharer = ''

  const result = db.update((data) => {
    const activity = data.activities.find((item) => item.id === activityId)
    if (!activity || activity.status === 'draft') return { error: '活动不存在' }
    if (activity.status === 'past') return { error: '这场活动已结束' }
    const exists = data.signups.some((item) => item.activityId === activityId && item.openid === req.user.openid)
    if (exists) return { error: '你已经报名过了' }
    const signup = {
      id: uid('s'),
      activityId,
      activityTitle: activity.title,
      openid: req.user.openid,
      name,
      phone,
      company: str(body.company, 40),
      sourceSharer,
      createdAt: new Date().toISOString(),
      checkedIn: false,
      checkedInAt: ''
    }
    data.signups.push(signup)
    return { signup }
  })
  if (result.error) return fail(res, 400, result.error)
  ok(res, result.signup)
})

router.get('/signup/mine', userAuth, (req, res) => {
  const signups = db
    .read()
    .signups.filter((item) => item.openid === req.user.openid)
    .sort((a, b) => String(b.createdAt).localeCompare(String(a.createdAt)))
  ok(res, { signups, checkins: signups.filter((item) => item.checkedIn) })
})

router.post('/checkin/scan', userAuth, (req, res) => {
  const body = req.body || {}
  const result = db.update((data) => {
    let activityId = ''
    if (body.simulate) {
      const activity = currentActivity(data)
      if (!activity) return { error: '当前没有进行中的活动' }
      activityId = activity.id
    } else {
      const code = data.checkinCodes.find((item) => item.token === str(body.token))
      if (!code) return { error: '签到码无效' }
      if (code.expiresAt && Date.parse(code.expiresAt) < Date.now()) return { error: '签到码已过期' }
      activityId = code.activityId
    }
    const signup = data.signups.find((item) => item.activityId === activityId && item.openid === req.user.openid)
    if (!signup) return { error: '请先报名再签到' }
    if (!signup.checkedIn) {
      signup.checkedIn = true
      signup.checkedInAt = new Date().toISOString()
    }
    return { signup }
  })
  if (result.error) return fail(res, 400, result.error)
  ok(res, result.signup)
})

router.post('/upload', userAuth, requireUserAdmin, uploader())

module.exports = router