/*
* JQuery feed fetcher from Google Feed
*
* Makes easier feed fetch from any RSS or XML feed, with Google Feed API on the fly
*
* Adds the following methods to jQuery:
* 
* $('.blog_content').feedfetcher(); - append a feed list in the applied DOM element with link to the source of feed result.
*
* Parameters
*	feed_source: '[feed_source]' - the source of the feed
*	head_class: '[class]' - append a feed source link and name to the given DOM element
*
*
* Result
* 	- A list of paragraphs contain a feed title with a link to a feed soure
*
* WARNING
* You need to load the JS API from google to use this plug-in
*
*	<script type="text/javascript" src="http://www.google.com/jsapi"></script>
*	<script type="text/javascript">
*    google.load("feeds", "1");
*	</script>
*
* Copyright (c) 2009 Istvan Ferenc Toth
*
* Plugin homepage:
* http://adminlight.com/static/files/feedfetch.html
*
* Example:
* http://adminlight.com/static/files/feedfetch.html
*
* Version 0.1.0.0
*
* Tested with:
* - Linux: Firefox 2
* - Windows: Firefox 2, Internet Explorer 6+
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
* Credits:
*   - http://code.google.com/: 
*   - http://adminlight.com: 
*	- http://www.learningjquery.com/2007/10/a-plugin-development-pattern
*/

(function ($) {
    //
    // plugin definition
    //
    $.fn.feedfetcher = function (options) {
        // build main options before element iteration
        var opts = $.extend({}, $.fn.feedfetcher.defaults, options);
        // iterate and reformat each matched element
        return this.each(function () {

            $this = $(this);
            // build element specific options
            var o = $.meta ? $.extend({}, opts, $this.data()) : opts;
            // display feed


            var feed = new google.feeds.Feed(o.feed_source);
            feed.setNumEntries(o.feed_items)
            var target = this;

            feed.load(function (results) { $.fn.feedfetcher.processResults(results, target, o) });

        });
    };

    //
    $.fn.feedfetcher.processResults = function (result, target, o) {

        $this = $(target);

        debug('feed contact ok');

        if (!result.error) {
            debug('feed content loaded');
            //$this.hide();
            //if (o.head_class!='') $('.'+o.head_class).append('<a href="'+result.feed.link+'" target="_blank">'+result.feed.title+'</a>');

            //var dl = document.createElement("dl");
            var container = $(o.container).appendTo($this);

            for (var i = 0; i < result.feed.entries.length && i < o.feed_items; i++) {
                var entry = result.feed.entries[i];

                var minute = 1000 * 60;
                var hour = minute * 60;
                var day = hour * 24;

                var timestamp = new Date(entry.publishedDate);
                var now = new Date();
                var offset = (now - timestamp);
				
				if(o.maxDaysOld){
					if(offset > (day * o.maxDaysOld)){
						break;
						}
				}
                var when; //published when e.g. 1hour ago, 35 minutes ago


                if (offset < hour) {
                    var c = Math.floor(offset / minute);
                    when = c + " minute" + (c != 1 ? "s" : "") + " ago";
                } else if (offset < day) {
                    var c = Math.floor(offset / hour);
                    when = c + " hour" + (c != 1 ? "s" : "") + " ago";
                } else {
                    var c = Math.floor(offset / day);
                    when = c != 1 ? c + " days ago" : "yesterday";
                }

                var author = entry.author.replace(/\(.*\)/ig, "");


                // 	$link$ 		= entry.link
                //	$author$ 	= entry.author
                //	$when$		= formatted date, e.g. 5 minutes ago, or 2 days ago.
                //	$content$	= entry.content
                var _item = o.itemtemplate;

                var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

                var day = timestamp.getDate();
                var month = months[timestamp.getMonth()];

                _item = _item.replace(/\$when\$/ig, when);
                _item = _item.replace(/\$author\$/ig, author);
                _item = _item.replace(/\$title\$/ig, entry.title);
                _item = _item.replace(/\$link\$/ig, entry.link);
                _item = _item.replace(/\$day\$/ig, day);
                _item = _item.replace(/\$month\$/ig, month);


                //Content - currently hardcoded truncate
                var content = $.fn.feedfetcher.truncateString(entry.content, { wordcount: o.contentWordCount });
                if (o.parselinks) content = content.replace(/(http:\/\/([^\s]*))/, "<a href='$1' target='_blank'>$1</a>")

                if (o.contentparsefunction) {
                    //content = o.contentparsefunction(content);
                    content = o.contentparsefunction(content);
                }

                _item = _item.replace(/\$content\$/ig, content);




                container.append(_item);
				
                /*
                $(dl)
                .append('<dt><a href="' + entry.link + '" target="_blank" onclick="pageTracker._trackPageview(\'/rss-feed-external/' + entry.link.replace("http://", "") +'\');return fbs_click();">' + byline + '</a></dt><dd>' + entry.content.replace(/(http:\/\/([^\s]*))/, "<a href='$1' target='_blank' onclick=\"pageTracker._trackPageview(\'/rss-feed-external/$2');return fbs_click();\">$1</a>") + '</dd>');
                */
            }
			o.callback();
        } else {
            debug('feed error');
            $this.append('<p>' + result.error.message + '</p>');
        }
        //$this.fadeIn("fast");

    }


    //
    // Truncate
    //
    $.fn.feedfetcher.truncateString = function (s, o) {


        this.options = o || {};
        this.wordcount = this.options.wordcount || 100;

        //split the string into word array
        var sa = s.split(" ");

        //Return original string
        if (sa.length <= this.wordcount) return s;
        //return the truncated string
        var tsa = sa.slice(0, this.wordcount)
        tsa.push("...")
        return tsa.join(" ");

    }

    //
    // private function for debugging
    //
    function debug($obj) {
        if (window.console && window.console.log)
            window.console.log('feedfetcher: ' + $obj);
    };
    //
    // plugin defaults
    //
    $.fn.feedfetcher.defaults = {
        feed_source: 'http://adminlight.blogspot.com/feeds/posts/default',
        container: "<ul id='blog-posts'>",
        itemtemplate: "<li> <div class='title'><a href='$link$' target='blank'>$title$</a></div> <div class='summary'>$content$</div> <div class='data'><span class='date'>Posted $when$</span></div></li>",
        contentWordCount: 50,
        parselinks: false,
        contentparsefunction: null,
		maxDaysOld: null,
		callback: function(){alert("callback")}
    };
    //
    // end of closure
    //
})(jQuery);