var http = require('http')
  , fs = require('fs')
  , url = require('url')
  , path = require('path')

// Goal: get this to client
var classes = ['cs573', 'cs4241']
var filtered = ['cs573', 'cs4241']

var server = http.createServer (function (req, res) {
  var uri = url.parse(req.url);
  console.log(uri.pathname);
  switch( uri.pathname ) {
    case '/':
      sendFile(res, 'public/index.html', 'text/html');
      break;

    case '/index.html':
      sendFile(res, 'public/index.html', 'text/html');
      break;

    case '/css/main.css':
      sendFile(res, 'public/css/main.css', 'text/css');
      console.log('sent css!');
      break;

    case '/add':
      console.log('Add!')
      handleAdd(req);
      res.end('done adding');
      break;

    case '/del':
      console.log('Del!');
      handleDel(req);
      res.end('done deleting');
      break;

    case '/filter':
      console.log('Filter!');
      handleFilter(req);
      res.end('done filtering');
      break;

    case '/list':
      res.end( JSON.stringify(filtered) );
      break;

    default:
      res.end('404 not found');
  }
});

function applyFilter(filter) {
   // filtering
   filtered.length = 0;
   for (var i=0; i<classes.length; i++) {
    console.log('About to filter');
    console.log(classes[i]);
    console.log(filter);
    if (classes[i].toLowerCase().search(filter.toLowerCase()) != -1) {
      console.log('match');
      filtered.push(classes[i]);
    };
   }
}

function handleAdd(req) {
 var chunk = ""
 req.on('data', function(data) {
   chunk += data;
 })
 req.on('end', function(data) {
   // Note: this is not a great way to access this object.
   var obj = chunk.split('=');
   classes.push( obj[1] );
   applyFilter("");
 })
}

function handleDel(req) {
  // remove the given class from list
 var chunk = ""
 req.on('data', function(data) {
   chunk += data;
 })
 req.on('end', function(data) {
   // Note: this is not a great way to access this object.
   var obj = chunk.split('=');
   //classes.push( obj[1] );
   var index = classes.indexOf(obj[1]);
   classes.splice(index, 1);
   applyFilter("");
 })
}

function handleFilter(req) {
  // remove the given class from list
 var chunk = ""
 req.on('data', function(data) {
   chunk += data;
 })
 req.on('end', function(data) {
   // Note: this is not a great way to access this object.
   var filter = chunk.split('=')[1];
   applyFilter(filter);

  });
}

server.listen(8080);
console.log('listening on 8080');

// subroutines

function sendFile(res, filename, contentType) {
  res.writeHead(200, {'Content-type': contentType })

  var stream = fs.createReadStream(filename)

  stream.on('data', function(data) {
    res.write(data);
  })

  stream.on('end', function(data) {
    res.end();
    return;
  })
}