(function($) {

    $.fn.tweet = function(o) {
        var s = $.extend({
            username: null,                           // [string or array] required unless using the 'query' option; one or more twitter screen names
            list: null,                               // [string]   optional name of list belonging to username
            favorites: false,                         // [boolean]  display the user's favorites instead of his tweets
            query: null,                              // [string]   optional search query
            avatar_size: null,                        // [integer]  height and width of avatar if displayed (48px max)
            count: 3,                                 // [integer]  how many tweets to display?
            fetch: null,                              // [integer]  how many tweets to fetch via the API (set this higher than 'count' if using the 'filter' option)
            retweets: true,                           // [boolean]  whether to fetch (official) retweets (not supported in all display modes)
            intro_text: null,                         // [string]   do you want text BEFORE your your tweets?
            outro_text: null,                         // [string]   do you want text AFTER your tweets?
            join_text: null,                         // [string]   optional text in between date and tweet, try setting to "auto"
            auto_join_text_default: "i said,",        // [string]   auto text for non verb: "i said" bullocks
            auto_join_text_ed: "i",                   // [string]   auto text for past tense: "i" surfed
            auto_join_text_ing: "i am",               // [string]   auto tense for present tense: "i was" surfing
            auto_join_text_reply: "i replied to",     // [string]   auto tense for replies: "i replied to" @someone "with"
            auto_join_text_url: "i was looking at",   // [string]   auto tense for urls: "i was looking at" http:...
            loading_text: null,                       // [string]   optional loading text, displayed while tweets load
            refresh_interval: null,                  // [integer]  optional number of seconds after which to reload tweets
            twitter_url: "twitter.com",               // [string]   custom twitter url, if any (apigee, etc.)
            twitter_api_url: "api.twitter.com",       // [string]   custom twitter api url, if any (apigee, etc.)
            twitter_search_url: "search.twitter.com", // [string]   custom twitter search url, if any (apigee, etc.)
            template: "{avatar}{time}{join}{text}",   // [string or function] template used to construct each tweet <li> - see code for available vars
            comparator: function(tweet1, tweet2) {    // [function] comparator used to sort tweets (see Array.sort)
                return tweet2["tweet_time"] - tweet1["tweet_time"];
            },
            filter: function(tweet) {                 // [function] whether or not to include a particular tweet (be sure to also set 'fetch')
                return true;
            }
        }, o);

        $.fn.extend({
            linkUrl: function() {
                var returning = [];
                // See http://daringfireball.net/2010/07/improved_regex_for_matching_urls
                var regexp = /\b((?:[a-z][\w-]+:(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))/gi;
                this.each(function() {
                    returning.push(this.replace(regexp,
                                      function(match) {
                                          var url = (/^[a-z]+:/i).test(match) ? match : "http://" + match;
                                          return "<a href=\"#\" onmousedown=\"javascript:window.open('" + url + "','',''); return false\">" + match + "</a>";
                                      }));
                });
                return $(returning);
            },
            linkUser: function() {
                var returning = [];
                var regexp = /[\@]+(\w+)/gi;
                this.each(function() {
                    returning.push(this.replace(regexp, "@<a href=\"#\" onmousedown=\"javascript:window.open('http://" + s.twitter_url + "/$1\','',''); return false\">$1</a>"));
                });
                return $(returning);
            },
            linkHash: function() {
                var returning = [];
                // Support various latin1 (\u00**) and arabic (\u06**) alphanumeric chars
                var regexp = /(?:^| )[\#]+([\w\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u00ff\u0600-\u06ff]+)/gi;
                var usercond = (s.username && s.username.length == 1) ? '&from=' + s.username.join("%2BOR%2B") : '';
                this.each(function() {
                    returning.push(this.replace(regexp, ' <a href=\"#\" onmousedown="javascript:window.open(\'http://' + s.twitter_search_url + '/search?q=&tag=$1&lang=all' + usercond + '\',\'\',\'\'); return false">#$1</a>'));
                });
                return $(returning);
            },
            capAwesome: function() {
                var returning = [];
                this.each(function() {
                    returning.push(this.replace(/\b(awesome)\b/gi, '<span class="awesome">$1</span>'));
                });
                return $(returning);
            },
            capEpic: function() {
                var returning = [];
                this.each(function() {
                    returning.push(this.replace(/\b(epic)\b/gi, '<span class="epic">$1</span>'));
                });
                return $(returning);
            },
            makeHeart: function() {
                var returning = [];
                this.each(function() {
                    returning.push(this.replace(/(&lt;)+[3]/gi, "<tt class='heart'>&#x2665;</tt>"));
                });
                return $(returning);
            }
        });

        function parse_date(date_str) {
            // The non-search twitter APIs return inconsistently-formatted dates, which Date.parse
            // cannot handle in IE. We therefore perform the following transformation:
            // "Wed Apr 29 08:53:31 +0000 2009" => "Wed, Apr 29 2009 08:53:31 +0000"
            return Date.parse(date_str.replace(/^([a-z]{3})( [a-z]{3} \d\d?)(.*)( \d{4})$/i, '$1,$2$4$3'));
        }

        function relative_time(date) {
            var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
            var delta = parseInt((relative_to.getTime() - date) / 1000, 10);
            var r = '';
            if (delta < 60) {
                r = delta + ' seconds ago';
            } else if (delta < 120) {
                r = 'a minute ago';
            } else if (delta < (45 * 60)) {
                r = (parseInt(delta / 60, 10)).toString() + ' minutes ago';
            } else if (delta < (2 * 60 * 60)) {
                r = 'an hour ago';
            } else if (delta < (24 * 60 * 60)) {
                r = '' + (parseInt(delta / 3600, 10)).toString() + ' hours ago';
            } else if (delta < (48 * 60 * 60)) {
                r = 'a day ago';
            } else {
                r = (parseInt(delta / 86400, 10)).toString() + ' days ago';
            }
            return 'about ' + r;
        }

        function build_url() {
            var proto = ('https:' == document.location.protocol ? 'https:' : 'http:');
            var count = (s.fetch === null) ? s.count : s.fetch;
            if (s.list) {
                return proto + "//" + s.twitter_api_url + "/1/" + s.username[0] + "/lists/" + s.list + "/statuses.json?per_page=" + count + "&callback=?";
            } else if (s.favorites) {
                return proto + "//" + s.twitter_api_url + "/favorites/" + s.username[0] + ".json?count=" + s.count + "&callback=?";
            } else if (s.query === null && s.username.length == 1) {
                return proto + '//' + s.twitter_api_url + '/1/statuses/user_timeline.json?screen_name=' + s.username[0] + '&count=' + count + (s.retweets ? '&include_rts=1' : '') + '&callback=?';
            } else {
                var query = (s.query || 'from:' + s.username.join(' OR from:'));
                return proto + '//' + s.twitter_search_url + '/search.json?&q=' + encodeURIComponent(query) + '&rpp=' + count + '&callback=?';
            }
        }

        return this.each(function(i, widget) {
            var list = $('<ul class="tweet_list">').appendTo(widget);
            var intro = '<p class="tweet_intro">' + s.intro_text + '</p>';
            var outro = '<p class="tweet_outro">' + s.outro_text + '</p>';
            var loading = $('<p class="loading">' + s.loading_text + '</p>');

            if (s.username && typeof (s.username) == "string") {
                s.username = [s.username];
            }

            var expand_template = function(info) {
                if (typeof s.template === "string") {
                    var result = s.template;
                    for (var key in info) {
                        var val = info[key];
                        result = result.replace(new RegExp('{' + key + '}', 'g'), val === null ? '' : val);
                    }
                    return result;
                } else return s.template(info);
            };

            if (s.loading_text) $(widget).append(loading);
            $(widget).bind("load", function() {
                $.getJSON(build_url(), function(data) {
                    if (s.loading_text) loading.remove();
                    if (s.intro_text) list.before(intro);
                    list.empty();

                    var tweets = $.map(data.results || data, function(item) {
                        var join_text = s.join_text;

                        // auto join text based on verb tense and content
                        if (s.join_text == "auto") {
                            if (item.text.match(/^(@([A-Za-z0-9-_]+)) .*/i)) {
                                join_text = s.auto_join_text_reply;
                            } else if (item.text.match(/(^\w+:\/\/[A-Za-z0-9-_]+\.[A-Za-z0-9-_:%&\?\/.=]+) .*/i)) {
                                join_text = s.auto_join_text_url;
                            } else if (item.text.match(/^((\w+ed)|just) .*/im)) {
                                join_text = s.auto_join_text_ed;
                            } else if (item.text.match(/^(\w*ing) .*/i)) {
                                join_text = s.auto_join_text_ing;
                            } else {
                                join_text = s.auto_join_text_default;
                            }
                        }

                        // Basic building blocks for constructing tweet <li> using a template
                        var screen_name = item.from_user || item.user.screen_name;
                        var source = item.source;
                        var user_url = "http://" + s.twitter_url + "/" + screen_name;
                        var avatar_size = s.avatar_size;
                        var avatar_url = item.profile_image_url || item.user.profile_image_url;
                        var tweet_url = "http://" + s.twitter_url + "/" + screen_name + "/status/" + item.id_str;
                        var retweet = (typeof (item.retweeted_status) != 'undefined');
                        var retweeted_screen_name = retweet ? item.retweeted_status.user.screen_name : null;
                        var tweet_time = parse_date(item.created_at);
                        var tweet_relative_time = relative_time(tweet_time);
                        var tweet_raw_text = retweet ? ('RT @' + retweeted_screen_name + ' ' + item.retweeted_status.text) : item.text; // avoid '...' in long retweets
                        var tweet_text = $([tweet_raw_text]).linkUrl().linkUser().linkHash()[0];

                        // Default spans, and pre-formatted blocks for common layouts
                        var user = '<a class="tweet_user" onmousedown="javascript:window.open(\'' + user_url + '\',\'\',\'\'); return false" href="#">' + screen_name + '</a>';
                        var join = ((s.join_text) ? ('<span class="tweet_join"> ' + join_text + ' </span>') : ' ');
                        var avatar = (avatar_size ?
                          ('<a class="tweet_avatar" onmousedown="javascript:window.open(\'' + user_url + '\',\'\',\'\'); return false" href="#"><img src="' + avatar_url +
                           '" height="' + avatar_size + '" width="' + avatar_size +
                           '" alt="' + screen_name + '\'s avatar" title="' + screen_name + '\'s avatar" border="0"/></a>') : '');
                        var time = '<span class="tweet_time"><a onmousedown="javascript:window.open(\'' + tweet_url + '\',\'\',\'\'); return false" href="#" title="view tweet on twitter">' + tweet_relative_time + '</a></span>';
                        var text = '<span class="tweet_text">' + $([tweet_text]).makeHeart().capAwesome().capEpic()[0] + '</span>';

                        return { item: item, // For advanced users who want to dig out other info
                            screen_name: screen_name,
                            user_url: user_url,
                            avatar_size: avatar_size,
                            avatar_url: avatar_url,
                            source: source,
                            tweet_url: tweet_url,
                            tweet_time: tweet_time,
                            tweet_relative_time: tweet_relative_time,
                            tweet_raw_text: tweet_raw_text,
                            tweet_text: tweet_text,
                            retweet: retweet,
                            retweeted_screen_name: retweeted_screen_name,
                            user: user,
                            join: join,
                            avatar: avatar,
                            time: time,
                            text: text
                        };
                    });

                    tweets = $.grep(tweets, s.filter).sort(s.comparator).slice(0, s.count);
                    list.append($.map(tweets,
                            function(t) { return "<li>" + expand_template(t) + "</li>"; }).join('')).
              children('li:first').addClass('tweet_first').end().
              children('li:odd').addClass('tweet_even').end().
              children('li:even').addClass('tweet_odd');

                    if (s.outro_text) list.after(outro);
                    $(widget).trigger("loaded").trigger((tweets.length === 0 ? "empty" : "full"));
                    if (s.refresh_interval) {
                        window.setTimeout(function() { $(widget).trigger("load"); }, 1000 * s.refresh_interval);
                    }
                });
            }).trigger("load");
        });
    };
})(jQuery);