let fs = require('fs');

let bodyParser = require('body-parser');
let outbound;

let getTemplates = require('./templates');
let errorSender = require('./errorSender');
exports.register = function() {
  outbound = this.haraka_require('./outbound');
  this.register_hook('init_http', 'initExpress');
}

exports.initExpress = function(next, server) {
    server.http.app.use('/webSend', setupRoutes(server.http.express.Router()));
    server.http.app.get('/test', (req, res) => res.send("HELLO!"));
  next();
};

function setupRoutes(app) {
  app.use(bodyParser.json());
  app.use(errorSender);

  app.post('/template', function(req, res) {
    try {
      if(!req.body) {
        return res.sendError(400, "No body provided.");
      }

      let {to, from, template, headers} = req.body;
      if(!template) {
        console.error("Template not found in: ", req.body);
        return res.sendError(400, "No template name provided.");
      }
      return getTemplates().then(function(templates) {
        if(!templates[template]) {
          return res.sendError(400, `Template not found in ${JSON.stringify(templates)}`);
        }
        let emailText = `From: ${from}\nTo: ${to}`;
        if(headers) {
          headers.forEach(function(header) {
            emailText += `\n${header}`;
          });
        }
        try {
          let {subject, message} = templates[template](req.body);
          emailText += `\nSubject: ${subject}\n\n${message}`;
        } catch (err) {
          console.error("Error building email from template: ", err);
          res.sendError(err.httpStatus || 400, err.userMessage || "Error parsing template");
        }
        outbound.send_email(from, to, emailText, function(code, message) {
          console.log(`Queue mail result code: ${code} msg: ${message}`);
          res.type("json").send(JSON.stringify({
            code,
            message
          }));
        });
      }).catch(function(err) {
        console.error("Error loading templates:", err);
        res.sendError(500, "Server Error");
        throw(e);
      });
    } catch(e) {
      res.sendError(500, "Server Error");
      throw(e);
    }
  });
    
  return app;
}