var promise = require('promise');
var nodeid = require('_agentNodeId')();
var ipcPath = process.platform == 'win32' ? ('\\\\.\\pipe\\' + nodeid + '-DAIPC') : (process.cwd() + '/DAIPC');

function queryAgent(obj)
{
    var ret = new promise(function (res, rej) { this._res = res; this._rej = rej; });
    ret._obj = { cmd: 'query', value: obj };
    ret.client = require('net').createConnection({ path: ipcPath });
    ret.client.promise = ret;
    ret.client.on('connect', function ()
    {
        this.on('data', function (chunk)
        {
            var len;
            if (chunk.length < 4) { this.unshift(chunk); return; }
            if ((len = chunk.readUInt32LE(0)) > chunk.length) { this.unshift(chunk); return;}

            var data = chunk.slice(4, len + 4);
            var payload = null;
            try
            {
                payload = JSON.parse(data.toString());
            }
            catch (e)
            {
                this.promise._rej('Invalid Response Received');
                return;
            }
            try
            {
                //this.promise._res(payload.result?payload.result:'');
                this.promise._res(payload.result);
            }
            catch(x)
            {
            }
            if ((len + 4) < chunk.length) { this.unshift(chunk.slice(4 + len)); }
        });
        this.on('end', function ()
        {
            this.promise._rej('closed');
        });

        var j = Buffer.from(JSON.stringify(this.promise._obj));
        var buf = Buffer.alloc(4 + j.length);
        buf.writeUInt32LE(j.length + 4, 0);
        j.copy(buf, 4);
        this.write(buf);
    });
    return (ret);
}

function start()
{
    console.log('Querying Mesh Agent state...');
    global._statustm = setTimeout(function ()
    {
        console.log('Unable to contact Mesh Agent...');
        process._exit();
    }, 3000);

    queryAgent('connection').then(function (res)
    {
        if (res == null) { res = '[NOT CONNECTED]'; }
        console.log('Mesh Agent connected to: ' + res);
        return (queryAgent('descriptors'));
    }).then(console.log).then(function () { process._exit(); }).catch(function () { process._exit(); });
}

module.exports = { start: start };