import path from 'path';
import nodemailer from 'nodemailer';
import { htmlToText } from 'nodemailer-html-to-text';
import templates from '../templates';
import projectInfo from '../../project-info';
import logger from '../../logger';
const moduleLogger = logger.child({
  module: 'emailServiceActions'
});
const packageInfo = require('../../../package.json');

// Get service options
const emailOptions = projectInfo['email'] || {};
const emailService = process.env['EMAIL_SERVICE'] || emailOptions['service'];
const emailHost = process.env['EMAIL_HOST'] || emailOptions['host'];
const emailPort = process.env['EMAIL_HORT'] || emailOptions['port'];
const emailUser = process.env['EMAIL_USER'] || emailOptions['user'];
const emailPassword = process.env['EMAIL_PASS'] || emailOptions['pass'];

const transportOptions = {};
if (emailService) {
  transportOptions.service = emailService;
}
if (emailHost) {
  transportOptions.host = emailHost;
}
if (emailPort) {
  transportOptions.port = emailPort;
}
if (emailUser) {
  transportOptions.auth = {
    user: emailUser,
    pass: emailPassword || ''
  };
}

// Get e-mail configuration
const emailSettings = projectInfo['email'];
const config = {...emailSettings};
if (process.env['EMAIL_FROM']) {
  config['from'] = process.env['EMAIL_FROM'];
}
config['recipients'] = config['recipients'] || {};

// Create nodemailer transporter
const transporter = nodemailer.createTransport(transportOptions);
transporter.use('compile', htmlToText());

export default {
  config,
  /**
   * @param {Object} params
   * @param {String} [params.to]
   * @param {String} [params.subject]
   * @param {String} [params.html]
   * @param {String} [params.text]
   */
  send: function (params) {
    const defaultConfig = this.config;
    const finalParams = {...defaultConfig, ...params};
    moduleLogger.trace('send', finalParams);
    transporter.sendMail(finalParams, (error, info) => {
      if (error) {
        return moduleLogger.error(error);
      }
    });
  },
  /**
   * @param {String} name of template file in email directory
   * @param {Object|String} params for send() or just subject
   * @param {Object} values to apply for the template
   */
  sendTemplate: function (name, params, values) {
    const templateName = path.join('email', name);
    const self = this;
    moduleLogger.trace('sendTemplate');
    templates.render(templateName, values, {
      cache: false
    }).then((html) => {
      moduleLogger.trace('sendTemplate: rendered to ', html);
      let finalParams;
      if (typeof params === 'string') {
        finalParams = {subject: params};
      } else {
        finalParams = params;
      }
      finalParams.html = html;
      self.send(finalParams);
    }).catch((err) => {
      moduleLogger.error('sendTemplate', { arguments, err });
    });
  }
};