var events = require('events');
var net = require('net');

var listener = module.exports = function listener(options){

    var _this = this;

    var emitLog = function(text){
        _this.emit('log', text);
    };


    this.start = function(){
        if (!options || !options.enabled){
            emitLog('Blocknotify listener disabled');
            return;
        }

        var blockNotifyServer = net.createServer(function(c) {
            emitLog('Block listener has incoming connection');
            var data = '';
            c.on('data', function(d){
                emitLog('Block listener received blocknotify data');
                data += d;
                if (data.slice(-1) === '\n'){
                    c.end();
                }
            });
            c.on('end', function() {

                emitLog('Block listener connection ended');

                var message = JSON.parse(data);
                if (message.password === options.password){
                    _this.emit('hash', message);
                }
                else
                    emitLog('Block listener received notification with incorrect password');

            });
        });
        blockNotifyServer.listen(options.port, function() {
            emitLog('Block notify listener server started on port ' + options.port)
        });

        emitLog("Block listener is enabled, starting server on port " + options.port);
    }



};

listener.prototype.__proto__ = events.EventEmitter.prototype;