var restify = require('restify')
    , util = require('util')
    , EventEmitter = require('events').EventEmitter;

var COSM = function(streams, key) {
    var self = this;

    var streams = streams;
    var interval = 1000;

    var jsonClient = restify.createJsonClient({
        url: 'http://api.cosm.com',
        headers: { 'X-ApiKey': key },
        version:'*'
    });

    var recentvalues = {};

    setInterval(function() {

        for(var i=0; i<streams.length; i++) {

            jsonClient.get('/v2/feeds/' + streams[i] + ".json", function(err, req, res, obj) {
                if(err || obj.datastreams == null) {
                    console.error("error getting stream: " + err)
                    return;
                }


                for(var i=0; i<obj.datastreams.length; i++) {
                    var dataStream = obj.datastreams[i];
                    if(dataStream.id == null) continue;

                    var streamName = dataStream.id;
                    if(streamName.length < 2 && dataStream.tags != null) {
                        streamName = dataStream.tags[0] + streamName;
                    }

                    var currentValue = dataStream.current_value;

                    if(isNumber(currentValue)) currentValue = parseFloat(currentValue);

                    var object = {
                        'stream': obj.id,
                        'feed': dataStream.id,
                        'tags': dataStream.tags,
                        'displayname': streamName,
                        'value': currentValue
                    };

                    var address = streams[i] + ":" + dataStream.id;

                    if(recentvalues[address] != currentValue) {
                        self.emit('changedvalue', object);
                    }

                    self.emit('updatevalue', object);


                    recentvalues[address] = currentValue;
                }
            });
        }

    }, interval);

    function isNumber(value) {
        if ((undefined === value) || (null === value)) {
            return false;
        }
        if (typeof value == 'number') {
            return true;
        }
        return !isNaN(value - 0);
    }

}

util.inherits(COSM, EventEmitter);

module.exports = COSM;