/* ==== MODULE ============================================================== */
var polymail = require.main.exports;
var newsletter = new polymail.Newsletter(require('./config.json'));
/* ==== REQUIRES ============================================================ */
var fs = require('fs');
var nodemailer = require('nodemailer');
var smtpPool = require('nodemailer-smtp-pool');

var doT = require('dot');
var md = require('markdown-it')({
  typographer: true
});
md.use(require('markdown-it-header-sections'));
md.use(require('markdown-it-deflist'));

var defaultRender = md.renderer.rules.image;
md.renderer.rules.image = function(tokens, idx, options, env, self) {
  var token = tokens[idx],
    aIndex = token.attrIndex('src');

  newsletter.temp.attachments.push({
    filename: token.attrs[aIndex][1],
    path: '',
    cid: token.attrs[aIndex][1]
  });
  token.attrs[aIndex][1] = 'cid:'+token.attrs[aIndex][1];

  return defaultRender(tokens, idx, options, env, self);
};

/* ==== NEWSLETTER ========================================================== */
// our custom build step
newsletter.build = function(file, options, cb) {
  // clear potential old newsletter
  newsletter.temp = {
    attachments: []
  };
  // merge passed options with newsletter defaults
  var opts = polymail.mergeObjects(newsletter.options, options);
  // read our provided content file
  var content = fs.readFileSync(file);
  opts.content = content;
  // read our markdown template and build it
  var md_source = fs.readFileSync(__dirname+'/templates/md.dot');
  var md_template = doT.template(md_source);
  var md_result = md_template(opts);
  // convert our content md into html
  opts.content = md.render(opts.content.toString());
  // at this point attachments should be populated with all pertinent attachments - let's modify it to make all paths relative to this file's directory
  var path = file;
  file = file.replace(/\.[^/.]+$/, "");
  for (var i = 0; i < newsletter.temp.attachments.length; i++) {
    newsletter.temp.attachments[i].path = file+'/'+newsletter.temp.attachments[i].filename;
  }
  // read our html template and build it
  var html_source = fs.readFileSync(__dirname+'/templates/html.dot');
  var html_template = doT.template(html_source);
  var html_result = html_template(opts);
  // set our temporary mail objects
  newsletter.temp.subject = opts.heading + (opts.title ? ' '+opts.title : '');
  newsletter.temp.text = md_result;
  newsletter.temp.html = html_result;
};

// create our transport
newsletter.transport = nodemailer.createTransport(smtpPool(newsletter.transport_options));

module.exports = newsletter;