let fs = require('fs');

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

let getTemplates = require('./templater');
let errorSender = require('./errorSender');
exports.register = function() {
  outbound = this.haraka_require('./outbound');
  this.register_hook('hook_init_http', function(next, server) {
    server.http.app.use('/webSend', setupRoutes(server.http.express.Router()));
    next();
  });
}

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

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

    let {to, from, template, headers} = req.body;
    if(!template) {
      return res.sendError(400, "No template name provided.");
    }
    return getTemplates.then(function(templates) {
      let emailText = `From: ${from}\nTo: ${to}`;
      if(headers) {
        headers.forEach(function(header) {
          emailText += `\n${header}`;
        });
      }
      try {
        let [subject, body] = `\n\n${templates[template](req.body)}\n`;
        emailText += `\nSubject: ${subject}\n\n${body}`;
      } 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: ${msg}`);
        res.type("json").send(JSON.stringigy({
          code,
          message
        }));
      });
    }).catch(function(err) {
      console.error("Error loading templates:", err);
      res.sendError(500, "Server Error");
    });
  });
    
  return app;
}