'use strict';

const Module = require('module');
const original_resolveFilename = Module._resolveFilename;

Module._resolveFilename = function(...args){
	args[0] = args[0].startsWith('>') ? args[0].replace('>', __dirname) : args[0];
  	return original_resolveFilename(...args);
};

const path = require('path');
const ejs = require('ejs')
const express = require('express');

// Set up the express app.
const app = express();

// List of front end node modules to be served
const frontEndModules = [
	'jquery', 'jquery-ui', 'moment', 'mustache',
  // 'bootstrap', '@fortawesome',
];

// Hold list of functions to run when the server is ready
app.onListen = [function(){console.log('hello')}];

// Allow the express app to be exported into other files. 
module.exports = app;

// Build the conf object from the conf files.
app.conf = require('./conf');

// Grab the projects PubSub
app.contollers = require('./controller');

// Push pubsub over the socket and back.
app.onListen.push(function(){
	app.io.use(middleware.authIO);

	app.contollers.pubsub.subscribe(/./g, function(data, topic){
		app.io.emit('P2PSub', { topic, data });
	});                                 

	app.io.on('connection', (socket) => {
		// console.log('socket', socket)
		var user = socket.user;
		socket.on('P2PSub', (msg) => {
			app.contollers.pubsub.publish(msg.topic, {...msg.data, __from:socket.user});
			// socket.broadcast.emit('P2PSub', msg);
		});
	});
}); 


// Hold onto the auth middleware 
const middleware = require('./middleware/auth');

// load the JSON parser middleware. Express will parse JSON into native objects
// for any request that has JSON in its content type. 
app.use(express.json());
app.set('json spaces', 2);

// Set up the templating engine to build HTML for the front end.
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// Have express server static content( images, CSS, browser JS) from the public
// local folder.
app.use('/__static', express.static(path.join(__dirname, 'public')))

// Server front end modules
// https://stackoverflow.com/a/55700773/3140931
frontEndModules.forEach(dep => {
  app.use(`/__static-modules/${dep}`, express.static(path.join(__dirname, `node_modules/${dep}`)))
});

// API route
app.use('/__api', require('./routes/api'));

// Routes for front end content.
app.use('/', require('./routes/proxy'));

// Catch 404 and forward to error handler. If none of the above routes are
// used, this is what will be called.
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.message = 'Page not found'
  err.status = 404;
  next(err);
});

// Error handler. This is where `next()` will go on error
app.use(function(err, req, res, next) {
  console.error(err.status || 500, err.name, req.method, req.url);

  // Parse key error for Sequilzw
  let keyErrors = {}
  if(['SequelizeValidationError'].includes(err.name) && err.errors){
  	for(let item of err.errors){
  		if(item.path){
  			keyErrors[item.path] = item.message;
  		}
  	}
  	err.status = 422;
  }

  if(![404, 422].includes(err.status || res.status)){
    console.error(err.message);
    console.error(err.stack);
    console.error('=========================================');
  }
  res.status(err.status || 500);
  res.json({
    name: err.name || 'Unknown error',
    message: err.message,
    keyErrors,
  });
});