'use strict';

var nodemailer = require('nodemailer'),
  mongoose = require('mongoose'),
  chalk = require('chalk'),
  config = require('../config/config'),
  mg = require('../config/lib/mongoose');

var transporter = nodemailer.createTransport(config.mailer.options);
var link = 'reset link here'; // PUT reset link here
var email = {
  from: config.mailer.from,
  subject: 'Security update'
};
var text = [
  'Dear {{name}},',
  '\n',
  'We have updated our password storage systems to be more secure and more efficient, please click the link below to reset your password so you can login in the future.',
  link,
  '\n',
  'Thanks,',
  'The Team'
].join('\n');

mg.loadModels();

mg.connect(function (db) {
  var User = mongoose.model('User');

  User.find().exec(function (err, users) {
    if (err) {
      throw err;
    }

    var processedCount = 0,
      errorCount = 0;

    // report and exit if no users were found
    if (users.length === 0) {
      return reportAndExit(processedCount, errorCount);
    }

    for (var i = 0; i < users.length; i++) {
      sendEmail(users[i]);
    }

    function sendEmail(user) {
      email.to = user.email;
      email.text = email.html = text.replace('{{name}}', user.displayName);

      transporter.sendMail(email, emailCallback(user));
    }

    function emailCallback(user) {
      return function (err, info) {
        processedCount++;

        if (err) {
          errorCount++;

          if (config.mailer.options.debug) {
            console.log('Error: ', err);
          }
          console.error('[' + processedCount + '/' + users.length + '] ' + chalk.red('Could not send email for ' + user.displayName));
        } else {
          console.log('[' + processedCount + '/' + users.length + '] Sent reset password email for ' + user.displayName);
        }

        if (processedCount === users.length) {
          return reportAndExit(processedCount, errorCount);
        }
      };
    }

    // report the processing results and exit
    function reportAndExit(processedCount, errorCount) {
      var successCount = processedCount - errorCount;

      console.log();

      if (processedCount === 0) {
        console.log(chalk.yellow('No users were found.'));
      } else {
        var alert;
        if (!errorCount) {
          alert = chalk.green;
        } else if ((successCount / processedCount) < 0.8) {
          alert = chalk.red;
        } else {
          alert = chalk.yellow;
        }

        console.log(alert('Sent ' + successCount + ' of ' + processedCount + ' emails successfully.'));
      }

      process.exit(0);
    }
  });
});