_ = require 'lodash'
co = require 'co'
errors = require '../commons/errors'
wrap = require 'co-express'
Promise = require 'bluebird'
parse = require '../commons/parse'
request = require 'request'
mongoose = require 'mongoose'
sendwithus = require '../sendwithus'
User = require '../models/User'
Classroom = require '../models/Classroom'


module.exports =
  fetchByGPlusID: wrap (req, res, next) ->
    gpID = req.query.gplusID
    gpAT = req.query.gplusAccessToken
    return next() unless gpID and gpAT

    dbq = User.find()
    dbq.select(parse.getProjectFromReq(req))
    url = "https://www.googleapis.com/oauth2/v2/userinfo?access_token=#{gpAT}"
    [googleRes, body] = yield request.getAsync(url, {json: true})
    idsMatch = gpID is body.id
    throw new errors.UnprocessableEntity('Invalid G+ Access Token.') unless idsMatch
    user = yield User.findOne({gplusID: gpID})
    throw new errors.NotFound('No user with that G+ ID') unless user
    res.status(200).send(user.toObject({req: req}))

  fetchByFacebookID: wrap (req, res, next) ->
    fbID = req.query.facebookID
    fbAT = req.query.facebookAccessToken
    return next() unless fbID and fbAT

    dbq = User.find()
    dbq.select(parse.getProjectFromReq(req))
    url = "https://graph.facebook.com/me?access_token=#{fbAT}"
    [facebookRes, body] = yield request.getAsync(url, {json: true})
    idsMatch = fbID is body.id
    throw new errors.UnprocessableEntity('Invalid Facebook Access Token.') unless idsMatch
    user = yield User.findOne({facebookID: fbID})
    throw new errors.NotFound('No user with that Facebook ID') unless user
    res.status(200).send(user.toObject({req: req}))

  removeFromClassrooms: wrap (req, res, next) ->
    yield req.user.removeFromClassrooms()
    next()

  remainTeacher: wrap (req, res, next) ->
    yield req.user.removeFromClassrooms()
    user = yield User.findById req.user.id
    res.status(200).send(user.toObject({req: req}))

  becomeStudent: wrap (req, res, next) ->
    userID = mongoose.Types.ObjectId(req.user.id)
    yield Classroom.remove({ ownerID: userID }, false)
    userID = mongoose.Types.ObjectId(req.user.id)
    yield User.update({ _id: userID }, { $set: { "role": "student" } })
    user = yield User.findById req.user.id
    res.status(200).send(user.toObject({req: req}))

  verifyEmailAddress: wrap (req, res, next) ->
    user = yield User.findOne({ _id: mongoose.Types.ObjectId(req.params.userID) })
    [timestamp, hash] = req.params.verificationCode.split(':')
    unless user
      throw new errors.UnprocessableEntity('User not found')
    unless req.params.verificationCode is user.verificationCode(timestamp)
      throw new errors.UnprocessableEntity('Verification code does not match')
    yield User.update({ _id: user.id }, { emailVerified: true })
    res.status(200).send({ role: user.get('role') })

  resetEmailVerifiedFlag: wrap (req, res, next) ->
    newEmail = req.body.email
    _id = mongoose.Types.ObjectId(req.body._id)
    if newEmail
      user = yield User.findOne({ _id })
      oldEmail = user.get('email')
      if newEmail isnt oldEmail
        yield User.update({ _id }, { $set: { emailVerified: false } })
    next()

  sendVerificationEmail: wrap (req, res, next) ->
    user = yield User.findById(req.params.userID)
    timestamp = (new Date).getTime()
    if not user
      throw new errors.NotFound('User not found')
    context =
      email_id: sendwithus.templates.verify_email
      recipient:
        address: user.get('email')
        name: user.broadName()
      email_data:
        name: user.broadName()
        verify_link: "http://codecombat.com/user/#{user._id}/verify/#{user.verificationCode(timestamp)}"
    sendwithus.api.send context, (err, result) ->
    res.status(200).send({})

  getStudents: wrap (req, res, next) ->
    throw new errors.Unauthorized('You must be an administrator.') unless req.user?.isAdmin()
    students = yield User.find({$and: [{schoolName: {$exists: true}}, {schoolName: {$ne: ''}}, {anonymous: false}]}).select('schoolName').lean()
    res.status(200).send(students)

  getTeachers: wrap (req, res, next) ->
    throw new errors.Unauthorized('You must be an administrator.') unless req.user?.isAdmin()
    teacherRoles = ['teacher', 'technology coordinator', 'advisor', 'principal', 'superintendent', 'parent']
    teachers = yield User.find(anonymous: false, role: {$in: teacherRoles}).select('').lean()
    res.status(200).send(teachers)