/* module make possible connectoin thrue socket.io on a server */

var io          = require('socket.io'),
    exec        = require('child_process').exec,
    Socket      = {};

/**
 * Function listen on servers port
 * @pServer {Object} started server object
 */
exports.listen = function(pServer){
    io = io.listen(pServer);
    
    io.sockets.on('connection', function (socket) {
        Socket = socket;
        socket.send('hello from server!');
        
        console.log('server connected');
        
        socket.on('message', function(pCommand) {
            console.log(pCommand);
            
            if(process.platform === 'win32')
                pCommand = 'chcp 65001 |' + pCommand;
            
            exec(pCommand, getExec);
        });
        
    });
};


/**
 * function send result of command to client
 * @param error
 * @param stdout
 * @param stderr
 */
function getExec(error, stdout, stderr) {
    if(stdout){
        console.log(stdout);
        Socket.send(stdout);
    }
    if(stderr){            
        console.log('stderr: ' + stderr);
        Socket.send(stderr);
    }
    
    if (error !== null) {
        console.log('exec error: ' + error);
    }    
}


// Windows code page 1251 Cyrillic
//var encodings = '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\u0402\u0403\u201a\u0453\u201e\u2026\u2020\u2021\u20ac\u2030\u0409\u2039\u040a\u040c\u040b\u040f\u0452\u2018\u2019\u201c\u201d\u2022\u2013\u2014\ufffd\u2122\u0459\u203a\u045a\u045c\u045b\u045f\xa0\u040e\u045e\u0408\xa4\u0490\xa6\xa7\u0401\xa9\u0404\xab\xac\xad\xae\u0407\xb0\xb1\u0406\u0456\u0491\xb5\xb6\xb7\u0451\u2116\u0454\xbb\u0458\u0405\u0455\u0457\u0410\u0411\u0412\u0413\u0414\u0415\u0416\u0417\u0418\u0419\u041a\u041b\u041c\u041d\u041e\u041f\u0420\u0421\u0422\u0423\u0424\u0425\u0426\u0427\u0428\u0429\u042a\u042b\u042c\u042d\u042e\u042f\u0430\u0431\u0432\u0433\u0434\u0435\u0436\u0437\u0438\u0439\u043a\u043b\u043c\u043d\u043e\u043f\u0440\u0441\u0442\u0443\u0444\u0445\u0446\u0447\u0448\u0449\u044a\u044b\u044c\u044d\u044e\u044f',
// Windows code page 1252
var encoding = '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\u20ac\ufffd\u201a\u0192\u201e\u2026\u2020\u2021\u02c6\u2030\u0160\u2039\u0152\ufffd\u017d\ufffd\ufffd\u2018\u2019\u201c\u201d\u2022\u2013\u2014\u02dc\u2122\u0161\u203a\u0153\ufffd\u017e\u0178\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff';

function win2unicode(bytes) {
    var n= bytes.length;
    var chars= new Array(n);
    for (var i= 0; i<n; i++)
        chars[i]= encoding.charAt(bytes.charCodeAt(i));
    return chars.join('');
}

/**
 * Windows-1251 to Unicode converter
 * Useful when having to use GET query parameters.
 * e.g. unescaped "%F2%E5%EA%F1%F2", "òåêñò" becomes "текст"
 * Source: http://xpoint.ru/know-how/JavaScript/PoleznyieFunktsii?38#PerekodirovkaIzWindows1251IKOI
 */
function win2unicode2(str) {
   var charmap   = unescape(
      "%u0402%u0403%u201A%u0453%u201E%u2026%u2020%u2021%u20AC%u2030%u0409%u2039%u040A%u040C%u040B%u040F"+
      "%u0452%u2018%u2019%u201C%u201D%u2022%u2013%u2014%u0000%u2122%u0459%u203A%u045A%u045C%u045B%u045F"+
      "%u00A0%u040E%u045E%u0408%u00A4%u0490%u00A6%u00A7%u0401%u00A9%u0404%u00AB%u00AC%u00AD%u00AE%u0407"+
      "%u00B0%u00B1%u0406%u0456%u0491%u00B5%u00B6%u00B7%u0451%u2116%u0454%u00BB%u0458%u0405%u0455%u0457")
   var code2char = function(code) {
               if(code >= 0xC0 && code <= 0xFF) return String.fromCharCode(code - 0xC0 + 0x0410)
               if(code >= 0x80 && code <= 0xBF) return charmap.charAt(code - 0x80)
               return String.fromCharCode(code)
            }
   var res = ""
   for(var i = 0; i < str.length; i++) res = res + code2char(str.charCodeAt(i))
   return res
}