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

var io          = require('socket.io'),
    exec        = require('child_process').exec,
    Socket      = {},
    Win32_b    = process.platform === 'win32';

/**
 * 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('{"stdout":"client connected"}');
        
        console.log('server connected');
        
        socket.on('message', function(pCommand) {
            console.log(pCommand);
            
            /* change code page to unicode */
            if(Win32_b)            
                pCommand = 'chcp 65001 |' + pCommand;
            
            exec(pCommand, getExec);
        });
        
    });
};


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

    var lExec = {
        stdout : pStdout,
        stderr : pStderr || pError
    };        
    
    var lExec_str = JSON.stringify(lExec);
    
    Socket.send(lExec_str);
    console.log(lExec);
}