mail = require '../commons/mail'
map = _.invert mail.MAILCHIMP_GROUP_MAP
User = require '../users/User.coffee'
errors = require '../commons/errors'
#request = require 'request'
config = require '../../server_config'
LevelSession = require '../levels/sessions/LevelSession.coffee'
Level = require '../levels/Level.coffee'
log = require 'winston'
sendwithus = require '../sendwithus'

#badLog = (text) ->
#  console.log text
#  request.post 'http://requestb.in/1brdpaz1', { form: {log: text} }

module.exports.setup = (app) ->
  app.all config.mail.mailchimpWebhook, handleMailchimpWebHook
  app.get '/mail/cron/ladder-update', handleLadderUpdate

getAllLadderScores = (next) ->
  query = Level.find({type: 'ladder'})
    .select('levelID')
    .lean()
  query.exec (err, levels) ->
    if err
      log.error "Couldn't fetch ladder levels. Error: ", err
      return next []
    for level in levels
      for team in ['humans', 'ogres']
        'I ... am not doing this.'

handleLadderUpdate = (req, res) ->
  log.info("Going to see about sending ladder update emails.")
  res.send('Great work, Captain Cron! I can take it from here.')
  res.end()
  # TODO: somehow fetch the histograms
  emailDays = [1, 2, 4, 7, 30]
  now = new Date()
  getTimeFromDaysAgo = (daysAgo) ->
    # 2 hours before the date
    t = now - (86400 * daysAgo + 2 * 3600) * 1000
  for daysAgo in emailDays
    # Get every session that was submitted in a 5-minute window after the time.
    startTime = getTimeFromDaysAgo daysAgo
    endTime = startTime + 5 * 60 * 1000
    #endTime = startTime + 1.5 * 60 * 60 * 1000  # Debugging: make sure there's something to send
    findParameters = {submitted: true, submitDate: {$gt: new Date(startTime), $lte: new Date(endTime)}}
    # TODO: think about putting screenshots in the email
    selectString = "creator team levelName levelID totalScore matches submitted submitDate"
    query = LevelSession.find(findParameters)
      .select(selectString)
      .lean()
    do (daysAgo) ->
      query.exec (err, results) ->
        if err
          log.error "Couldn't fetch ladder updates for #{findParameters}\nError: #{err}"
          return errors.serverError res, "Ladder update email query failed: #{JSON.stringify(err)}"
        log.info "Found #{results.length} ladder sessions to email updates about for #{daysAgo} day(s) ago."
        sendLadderUpdateEmail result, daysAgo for result in results

sendLadderUpdateEmail = (session, daysAgo) ->
  User.findOne({_id: session.creator}).select("name email firstName lastName emailSubscriptions preferredLanguage").lean().exec (err, user) ->
    if err
      log.error "Couldn't find user for #{session.creator} from session #{session._id}"
      return
    unless user.email and ('notification' in user.emailSubscriptions) and not session.unsubscribed
      log.info "Not sending email to #{user.email} #{user.name} because they only want emails about #{user.emailSubscriptions} - session unsubscribed: #{session.unsubscribed}"
      return
    unless session.levelName
      log.info "Not sending email to #{user.email} #{user.name} because the session had no levelName in it."
      return
    name = if user.firstName and user.lastName then "#{user.firstName} #{user.lastName}" else user.name
    name = "Wizard" if not name or name is "Anoner"

    # Fetch the most recent defeat and victory, if there are any.
    # (We could look at strongest/weakest, but we'd have to fetch everyone, or denormalize more.)
    matches = _.filter session.matches, (match) -> match.date >= (new Date() - 86400 * 1000 * daysAgo)
    defeats = _.filter matches, (match) -> match.metrics.rank is 1 and match.opponents[0].metrics.rank is 0
    victories = _.filter matches, (match) -> match.metrics.rank is 0
    defeat = _.last defeats
    victory = _.last victories

    sendEmail = (defeatContext, victoryContext) ->
      # TODO: do something with the preferredLanguage?
      context =
        email_id: sendwithus.templates.ladder_update_email
        recipient:
          address: user.email
          #address: 'nick@codecombat.com'  # Debugging
          name: name
        email_data:
          name: name
          days_ago: daysAgo
          wins: victories.length
          losses: defeats.length
          total_score: Math.round(session.totalScore * 100)
          team: session.team
          team_name: session.team[0].toUpperCase() + session.team.substr(1)
          level_name: session.levelName
          session_id: session._id
          ladder_url: "http://codecombat.com/play/ladder/#{session.levelID}#my-matches"
          defeat: defeatContext
          victory: victoryContext
      log.info "Sending ladder update email to #{context.recipient.address} with #{context.email_data.wins} wins and #{context.email_data.losses} since #{daysAgo} day(s) ago."
      sendwithus.api.send context, (err, result) ->
        log.error "Error sending ladder update email: #{err} with result #{result}" if err

    urlForMatch = (match) ->
      "http://codecombat.com/play/level/#{session.levelID}?team=#{session.team}&session=#{session._id}&opponent=#{match.opponents[0].sessionID}"

    onFetchedDefeatedOpponent = (err, defeatedOpponent) ->
      if err
        log.error "Couldn't find defeateded opponent: #{err}"
        defeatedOpponent = null
      victoryContext = {opponent_name: defeatedOpponent?.name ? "Anoner", url: urlForMatch(victory)} if victory

      onFetchedVictoriousOpponent = (err, victoriousOpponent) ->
        if err
          log.error "Couldn't find victorious opponent: #{err}"
          victoriousOpponent = null
        defeatContext = {opponent_name: victoriousOpponent?.name ? "Anoner", url: urlForMatch(defeat)} if defeat
        sendEmail defeatContext, victoryContext

      if defeat
        User.findOne({_id: defeat.opponents[0].userID}).select("name").lean().exec onFetchedVictoriousOpponent
      else
        onFetchedVictoriousOpponent null, null

    if victory
      User.findOne({_id: victory.opponents[0].userID}).select("name").lean().exec onFetchedDefeatedOpponent
    else
      onFetchedDefeatedOpponent null, null


handleMailchimpWebHook = (req, res) ->
  post = req.body
  #badLog("Got post data: #{JSON.stringify(post, null, '\t')}")

  unless post.type in ['unsubscribe', 'profile']
    res.send 'Bad post type'
    return res.end()

  unless post.data.email
    res.send 'No email provided'
    return res.end()

  query = {'mailChimp.leid':post.data.web_id}
  User.findOne query, (err, user) ->
    return errors.serverError(res) if err
    if not user
      return errors.notFound(res)

    handleProfileUpdate(user, post) if post.type is 'profile'
    handleUnsubscribe(user) if post.type is 'unsubscribe'

    user.updatedMailChimp = true # so as not to echo back to mailchimp
    user.save (err) ->
      return errors.serverError(res) if err
      res.end('Success')


handleProfileUpdate = (user, post) ->
  groups = post.data.merges.INTERESTS.split(', ')
  groups = (map[g] for g in groups when map[g])
  otherSubscriptions = (g for g in user.get('emailSubscriptions') when not mail.MAILCHIMP_GROUP_MAP[g])
  groups = groups.concat otherSubscriptions
  user.set 'emailSubscriptions', groups

  fname = post.data.merges.FNAME
  user.set('firstName', fname) if fname

  lname = post.data.merges.LNAME
  user.set('lastName', lname) if lname

  user.set 'mailChimp.email', post.data.email
  user.set 'mailChimp.euid', post.data.id

#  badLog("Updating user object to: #{JSON.stringify(user.toObject(), null, '\t')}")

handleUnsubscribe = (user) ->
  user.set 'emailSubscriptions', []

#  badLog("Unsubscribing user object to: #{JSON.stringify(user.toObject(), null, '\t')}")