/**
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

var RED = require(process.env.NODE_RED_HOME+"/red/red");
var FeedParser = require("feedparser");
var request = require("request");

function FeedParseNode(n) {
	RED.nodes.createNode(this,n);
	this.url = n.url;
	this.interval = (parseInt(n.interval)||15)*60000;
	var node = this;
	this.interval_id = null;
	this.seen = {};
	if (this.url !== "") {
	    var getFeed = function() {
            request(node.url,function(err) {
                    if (err) node.error(err);
            })
                .pipe(new FeedParser({feedurl:node.url}))
                .on('error', function(error) {
                        node.error(error);
                })
                .on('meta', function (meta) {})
                .on('readable', function () {
                        var stream = this, article;
                        while (article = stream.read()) {
                            if (!(article.guid in node.seen) || ( node.seen[article.guid] != 0 && node.seen[article.guid] != article.date.getTime())) {
                                node.seen[article.guid] = article.date?article.date.getTime():0;
                                var msg = {
                                    topic:article.origlink||article.link,
                                    payload: article.description,
                                    article: article
                                };
                                node.send(msg);
                            }
                        }
                })
                .on('end', function () {
                });
        };
	    this.interval_id = setInterval(getFeed,node.interval);
	    getFeed();

	} else {
	    this.error("Invalid url");
	}
}

RED.nodes.registerType("feedparse",FeedParseNode);

FeedParseNode.prototype.close = function() {
    if (this.interval_id != null) {
        clearInterval(this.interval_id);
    }
}