var fs = require('fs');
var md5File = require('md5-file');
var express = require('express');
var semverUtils = require('semver-utils')
var client = require('./client');

var httpPort = 3127;

var stairsHost = '10.138.2.25';
var stairsUdpPort = 3126;

var firmwareFile = './update/firmware.bin';


function requireNoCache(filename)
{
  delete require.cache[require.resolve(filename)];
  return require(filename);
}


function isNewer(version1, version2)
{
  if (version1.major > version2.major) return true;
  if (version1.major < version2.major) return false;

  if (version1.minor > version2.minor) return true;
  if (version1.minor < version2.minor) return false;

  if (version1.patch > version2.patch) return true;
  if (version1.patch < version2.patch) return false;

  if (parseInt(version1.build, 10) > parseInt(version2.build, 10)) return true;
  return false;
}


client.init(stairsHost, stairsUdpPort);


var app = express();

app.get('/ping', function(req, res)
{
  client.ping(function(data, error)
  {
    if (error)
      res.status(500);

    res.send(data);
  });
});

app.get('/getMode', function(req, res)
{
  client.getMode(function(data, error)
  {
    if (error)
      res.status(500);

    res.send(data);
  });
});

app.get('/setMode/:mode', function(req, res)
{
  client.setMode(req.params.mode, req.query, function(data, error)
  {
    if (error)
      res.status(500);

    res.send(data);
  });
});

app.get('/updateFirmware', function(req, res)
{
  client.updateFirmware(req.query, function(data, error)
  {
    if (error)
      res.status(500);

    res.send(data);
  });
})

app.get('/checkUpdate', function(req, res)
{
  if (!fs.existsSync(firmwareFile))
  {
    console.log('checkUpdate: ' + firmwareFile + ' not found!');
    res.sendStatus(304);
    return;
  }

  var version = requireNoCache('./version.js');
  var deviceVersion = semverUtils.parse(req.headers['x-esp8266-version']);
  var localVersion = semverUtils.parse(version.Version);

  console.log('checkUpdate:');
  console.log('  Device version = ' + semverUtils.stringify(deviceVersion));
  console.log('  Local version  = ' + semverUtils.stringify(localVersion));

  if (isNewer(localVersion, deviceVersion))
  {
    console.log('Sending update');

    md5File(firmwareFile, function(err, hash)
    {
      if (err)
      {
        res.sendStatus(500);
        return;
      }

      res.set('Content-Length', fs.statSync(firmwareFile).size);
      res.set('x-MD5', hash);
      res.download(firmwareFile);
    });
  }
  else
  {
    console.log('No update required');
    res.sendStatus(304);
  }
});

app.use(express.static(__dirname + '/static'));



app.listen(httpPort, function ()
{
  console.log('Stairs ReST service running on port ' + httpPort);
});