/*!
 * jQuery Twitter Search Plugin
 * Examples and documentation at: http://jquery.malsup.com/twitter/
 * Copyright (c) 2010 M. Alsup
 * Version: 1.03 (17-MAY-2011)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 * Requires: jQuery v1.3.2 or later
 */
 
;(function ($) {
    $.fn.twitterSearch = function (options) {
        if (typeof options == 'string')
            options = { term: options };
        return this.each(function () {
            var grabFlag = false,
				grabbing = false,
				$frame = $(this), text, $text, $title, $bird, $cont, height, paused = false,
				opts = $.extend(true, {}, $.fn.twitterSearch.defaults, options || {}, $.metadata ? $frame.metadata() : {});

            opts.formatter = opts.formatter || $.fn.twitterSearch.formatter;
            opts.filter = opts.filter || $.fn.twitterSearch.filter;

            if (opts.title === null) // user can set to '' to suppress title
                opts.title = opts.term;

            opts.title = opts.title || '';
            text = opts.titleLink ? ('<a href="' + opts.titleLink + '">' + opts.title + '</a>') : ('<span>' + opts.title + '</span>');
            $text = $(text);
            if (opts.titleLink)
                $text.css(opts.css['titleLink']);
            $title = $('<div class="twitterSearchTitle"></div>').appendTo($frame);


            $cont = $('<div class="twitterSearchContainter"></div>').appendTo($frame).css(opts.css['container']);
            cont = $cont[0];


            //$frame.css(opts.css['frame']);
            //if (opts.colorExterior)
            //$frame.css('border-color',opts.colorExterior);

            height = $frame.innerHeight() - $title.outerHeight();
            $cont.height(height);

            if (opts.pause)
                $cont.hover(function () { paused = true; }, function () { paused = false; });

            $('<div class="twitterSearchLoading">Loading tweets..</div>').css(opts.css['loading']).appendTo($cont);

            grabTweets();

            function grabTweets() {
                var url = opts.url + opts.term;
                grabFlag = false;
                grabbing = true;
                // grab twitter stream
                $.getJSONP({
                    url: url,
                    timeout: 30000,
                    error: function (xhr, status, e) {
                        failWhale(e);
                    },
                    complete: function () {
                        grabbing = false;
                        if (opts.refreshSeconds)
                            setTimeout(regrab, opts.refreshSeconds * 1000);
                    },
                    success: function (json) {
                        if (json.error) {
                            failWhale(json.error);
                            return;
                        }
                        $cont.fadeOut('fast', function () {
                            $cont.empty();

                            // iterate twitter results 
                            $.each(json.results, function (i) {
                                if (!opts.filter.call(opts, this))
                                    return; // skip this tweet
                                var $img, $text, w,
									tweet = opts.formatter(this, opts),
									$tweet = $(tweet);
                                $tweet.css(opts.css['tweet']);
                                $img = $tweet.find('.twitterSearchProfileImg').css(opts.css['img']);
                                $tweet.find('.twitterSearchUser').css(opts.css['user']);
                                $tweet.find('.twitterSearchTime').css(opts.css['time']);
                                $tweet.find('a').css(opts.css['a']);
                                $tweet.appendTo($cont);
                                $text = $tweet.find('.twitterSearchText').css(opts.css['text']);
                                if (opts.avatar) {
                                    w = $img.outerWidth() + parseInt($tweet.css('paddingLeft'));
                                    $text.css('paddingLeft', w);
                                }
                            });

                            $cont.fadeIn('fast');

                            if (json.results.length < 2) {
                                if (opts.refreshSeconds)
                                    setTimeout(grabTweets, opts.refreshSeconds * 1000);
                                return;
                            }

                            // stage first animation
                            setTimeout(go, opts.timeout);
                        });
                    }
                });
            };

            function regrab() {
                grabFlag = true;
            }

            function failWhale(msg) {
                var $fail = $('<div class="twitterSearchFail">' + msg + '</div>').css(opts.css['fail']);
                $cont.empty().append($fail);
            };

            function go() {
                if (paused || grabbing) {
                    setTimeout(go, 500);
                    return;
                }
                var h, $el = $cont.children(':first'), el = $el[0];
                $el.animate(opts.animOut, opts.animOutSpeed, function () {
                    h = $el.outerHeight();
                    $el.animate({ marginTop: -h }, opts.animInSpeed, function () {
                        $el.css({ marginTop: 0, opacity: 1 });
                        /*@cc_on
                        try { el.style.removeAttribute('filter'); } // ie cleartype fix
                        catch (smother) { }
                        @*/
                        $el.css(opts.css['tweet']).show().appendTo($cont);

                        setTimeout(grabFlag ? grabTweets : go, opts.timeout);
                    });
                });
            }
        });
    };

    $.fn.twitterSearch.filter = function (tweet) {
        return true;
    };

    $.fn.twitterSearch.formatter = function (json, opts) {
        var str, pretty,
			text = json.text;
        if (opts.anchors) {
            text = json.text.replace(/(http:\/\/\S+)/g, '<a href="$1">$1</a>');
            text = text.replace(/\@(\w+)/g, '<a href="http://twitter.com/$1">@$1</a>');
        }

        if (json.profile_image_url == 'http://static.twitter.com/images/default_profile_normal.png') {
            json.profile_image_url = 'http://a0.twimg.com/sticky/default_profile_images/default_profile_5_normal.png';
        }

        str = '<div class="twitterSearchTweet" style="border-bottom:1px solid #EBEBEB;display:table;width:100%;">';
        if (opts.avatar)
            str += '<img class="twitterSearchProfileImg" src="' + json.profile_image_url + '" />';
        str += '<div><span class="twitterSearchUser"><a href="http://www.twitter.com/' + json.from_user + '/status/' + json.id + '" target="_blank">'
		  + json.from_user + '</a></span>';
        pretty = prettyDate(json.created_at);
        if (opts.time && pretty)
            str += ' <span class="twitterSearchTime">(' + pretty + ')</span>'
        str += '<div class="twitterSearchText">' + text + '</div></div></div>';
        return str;
    };

    $.fn.twitterSearch.defaults = {
        url: 'http://search.twitter.com/search.json?callback=?&q=',
        anchors: true, 			// true or false (enable embedded links in tweets)
        animOutSpeed: 500, 		// speed of animation for top tweet when removed
        animInSpeed: 500, 		// speed of scroll animation for moving tweets up
        animOut: { opacity: 0 }, // animation of top tweet when it is removed
        applyStyles: true, 		// true or false (apply default css styling or not)
        avatar: true, 			// true or false (show or hide twitter profile images)
        bird: false, 				// true or false (show or hide twitter bird image)
        birdLink: false, 		// url that twitter bird image should like to
        birdSrc: 'http://cloud.github.com/downloads/malsup/twitter/tweet.gif', // twitter bird image
        colorExterior: null,        // css override of frame border-color and title background-color
        colorInterior: null,        // css override of container background-color
        filter: null,               // callback fn to filter tweets:  fn(tweetJson) { /* return false to skip tweet */ }
        formatter: null, 		// callback fn to build tweet markup
        pause: false, 			// true or false (pause on hover)
        refreshSeconds: 0,          // number of seconds to wait before polling for newer tweets
        term: '', 				// twitter search term
        time: true, 				// true or false (show or hide the time that the tweet was sent)
        timeout: 4000, 			// delay betweet tweet scroll
        title: null, 			// title text to display when frame option is true (default = 'term' text)
        titleLink: null, 		// url for title link
        css: {
            // default styling
            a: {},
            bird: { width: '50px', height: '20px', position: 'absolute', left: '-30px', top: '-20px', border: 'none' },
            container: { overflow: 'hidden', height: '100%' },
            fail: { height: '100%', padding: '10px' },
            frame: {},
            tweet: { padding: '5px 0 5px 5px', clear: 'left' },
            img: { 'float': 'left', margin: '5px', width: '48px', height: '48px' },
            loading: { padding: '20px', textAlign: 'center', color: '#888' },
            text: { },
            time: { fontSize: 'smaller', color: '#888' },
            title: { margin: 0, padding: '0 0 5px 0', textAlign: 'center', fontWeight: 'bold', fontSize: 'large', position: 'relative' },
            titleLink: {},
            user: { fontWeight: 'bold' }
        }
    };

    // fn to handle jsonp with timeouts and errors
    // hat tip to Ricardo Tomasi for the timeout logic
    $.getJSONP = function (s) {
        s.dataType = 'jsonp';
        $.ajax(s);

        // figure out what the callback fn is
        var $script = $(document.getElementsByTagName('head')[0].firstChild);
        var url = $script.attr('src') || '';
        var cb = (url.match(/callback=(\w+)/) || [])[1];
        if (!cb)
            return; // bail
        var t = 0, cbFn = window[cb];

        $script[0].onerror = function (e) {
            $script.remove();
            handleError(s, {}, "error", e);
            clearTimeout(t);
        };

        if (!s.timeout)
            return;

        window[cb] = function (json) {
            clearTimeout(t);
            cbFn(json);
            cbFn = null;
        };

        t = setTimeout(function () {
            $script.remove();
            handleError(s, {}, "timeout");
            if (cbFn)
                window[cb] = function () { };
        }, s.timeout);

        function handleError(s, xhr, msg, e) {
            s.error && s.error.call(s.context, xhr, msg, e);
            s.global && $.event.trigger("ajaxError", [xhr, s, e || msg]);
            s.complete && s.complete.call(s.context, xhr, e || msg);
        }
    };

    /*
    * JavaScript Pretty Date
    * Copyright (c) 2008 John Resig (jquery.com)
    * Licensed under the MIT license.
    */
    // converts ISO time to casual time
    function prettyDate(time) {
        var date = new Date((time || "").replace(/-/g, "/").replace(/TZ/g, " ")),
			diff = (((new Date()).getTime() - date.getTime()) / 1000),
			day_diff = Math.floor(diff / 86400);

        if (isNaN(day_diff) || day_diff < 0 || day_diff >= 31)
            return;
        var v = day_diff == 0 && (
				diff < 60 && "just now" ||
				diff < 120 && "1 minute ago" ||
				diff < 3600 && Math.floor(diff / 60) + " minutes ago" ||
				diff < 7200 && "1 hour ago" ||
				diff < 86400 && Math.floor(diff / 3600) + " hours ago") ||
			day_diff == 1 && "Yesterday" ||
			day_diff < 7 && day_diff + " days ago" ||
			day_diff < 31 && Math.ceil(day_diff / 7) + " weeks ago";
        if (!v)
            window.console && console.log(time);
        return v ? v : '';
    }

})(jQuery);