'use strict';

const formData = require('form-data');
const Mailgun = require('mailgun.js');
const { removeUndefined } = require('@strapi/utils');

const optionsMap = {
  apiKey: { field: 'key', fn: value => value },
  host: { field: 'url', fn: value => `https://${value || 'api.mailgun.net'}` },
};

module.exports = {
  convertProviderOptions(providerOptions = {}) {
    const newOptions = {};
    if (typeof providerOptions === 'object') {
      Object.keys(providerOptions).forEach(key => {
        if (Object.keys(optionsMap).includes(key)) {
          newOptions[optionsMap[key].field] = optionsMap[key].fn(providerOptions[key]);
        } else {
          newOptions[key] = providerOptions[key];
        }
      });
    }
    return newOptions;
  },

  init(providerOptions = {}, settings = {}) {
    const defaults = {
      username: 'api',
    };
    const mailgun = new Mailgun(formData);
    const mg = mailgun.client({ ...defaults, ...this.convertProviderOptions(providerOptions) });

    return {
      send(options) {
        const { from, to, cc, bcc, replyTo, subject, text, html, ...rest } = options;

        let data = {
          from: from || settings.defaultFrom,
          to,
          cc,
          bcc,
          'h:Reply-To': replyTo || settings.defaultReplyTo,
          subject,
          text,
          html,
          ...rest,
        };

        return mg.messages.create(providerOptions.domain, removeUndefined(data));
      },
    };
  },
};