var Liquid = require('liquid-node')
var fs = require('fs')
var Q = require('q')
var htmlTemplate = fs.readFileSync('templates/email.html', 'utf8')
var textTemplate = fs.readFileSync('templates/email.txt', 'utf8')
var mailgun = require('mailgun.js')
var request = require('request')

/*
  awmail: {
    lib: require("./lib/awmail"),
    apikey: process.env.MAILGUN_API_KEY,
		domain: process.env.MAILGUN_DOMAIN,
    from: 'Postmaster <mail@example.com>',
    subject: 'Your Result',
  }
*/

function AWMail (options) {
  if (!(this instanceof AWMail)) return new AWMail(options)
  options = options || {}
  if (!options.express)
    throw new Error('Express not provided to AWMail')
  if (!options.config)
    throw new Error('Configuration not provided to AWMail')

  var express = options.express
  var router = express.Router()
  var config = options.config

  var engine = new Liquid.Engine

  var mg = mailgun.client({
    username: 'api',
    key: process.env.MAILGUN_API_KEY,
  })

  router.post('/send', function (req, res) {
    res.header('Access-Control-Allow-Origin', '*')
    res.header('Access-Control-Allow-Headers', 'X-Requested-With')
  
    var email = req.body.email
    var track = req.body.track
    var hash = req.body.hash
		var secret = req.body.secret

		if (! hash || secret !== config.secret) {
		  return res.sendStatus(500)
		}
    
    deferToNextTick().then(function(){
      console.log("parse templates")
      var templateData = {
        email: email,
        hash: hash,
      }
      return parseTemplates(templateData)
    }).then(function(mailData){
      console.log("send mail")
      mailData.email = email
      return sendMail(mailData)
    }).then(function(){
      console.log("store email")
      if (track) {
        return storeEmail(email)
      } else {
        return Q.Promise(function(resolve, reject, notify) { resolve() })
      }
    }).then(function(){
      console.log("all done")
    }).catch(function(err){
      console.log(err)
    })

    res.sendStatus(200)
  })

  router.get('/test', function (req, res) {
    var hash = 'test'
    var email = 'julescarbon@gmail.com'
    deferToNextTick().then(function(){
      console.log("parse templates")
      var templateData = {
        email: email,
        hash: hash,
      }
      return parseTemplates(templateData)
    }).then(function(mailData){
      console.log("send mail")
      mailData.email = email
      return sendMail(mailData)
    }).then(function(){
      console.log("store email")
      return storeEmail(email)
    }).then(function(){
      console.log("all done")
    }).catch(function(err){
      console.log(err)
    })

    res.sendStatus(200)
  })
  
  function deferToNextTick(){
    return Q.Promise(function(resolve, reject, notify) {
      process.nextTick(function(){
        resolve()
      })
    })
  }

/*
  function uploadImage (data){
    return Q.Promise(function(resolve, reject, notify) {
      upload.put({
        file: data.file,
        preserveFilename: false,
        dirname: "nars/mail",
        types: {
          'image/gif': 'gif',
          'image/jpeg': 'jpg',
          'image/jpg': 'jpg',
          'image/png': 'png',
        },
        unacceptable: function(err){
          reject(new Error("S3 error: " + err))
        },
        success: function(url){
          resolve(url)
        }
      })
    })
  }
*/
  
  function parseTemplates (data){
    return Q.Promise(function(resolve, reject, notify) {
      engine.parseAndRender(textTemplate, data).then(function(textResult){
        engine.parseAndRender(htmlTemplate, data).then(function(htmlResult){
          resolve({
            text: textResult,
            html: htmlResult
          })
        }).catch(function(){ reject(new Error("Error building text template")) })
      }).catch(function(){ reject(new Error("Error building html template")) })
    })
  }
  
  function sendMail (content){
    return mg.messages.create(config.domain, {
      from: config.from,
      to: [content.email],
      subject: config.subject,
      text: content.text,
      html: content.html,
    })
  }
  
  function storeEmail (mail){
    return Q.Promise(function(resolve, reject, notify) {
      var data = {}
      data['Email'] = mail
      data['entry.1571194529'] = mail
      data['fvv'] = "1"
      
      var url = "https://docs.google.com/forms/d/e/1FAIpQLSfBdSrjLyoZwnttbeQ5v_kuW8n9k9CGWfXDSHTNixHOlvsxCg/formResponse"

      request({ url: url, qs: data }, function (err, response, body) {
        if (err || response.statusCode !== 200) {
          reject(err)
        } else {
          resolve()
        }
      })
    })
  }
  
  this._router = router
}

AWMail.prototype.middleware = function () {
  return this._router
}

module.exports = AWMail