(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)
            page: 1,                                  // [integer]  which page of results to fetch (if count != fetch, you'll get unexpected results)
            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;
            },
            seconds_ago_text: "about %d seconds ago",
            a_minutes_ago_text: "about a minute ago",
            minutes_ago_text: "about %d minutes ago",
            a_hours_ago_text: "about an hour ago",
            hours_ago_text: "about %d hours ago",
            a_day_ago_text: "about a day ago",
            days_ago_text: "about %d days ago",
            view_text: "view tweet on twitter"
        }, o);

        // See http://daringfireball.net/2010/07/improved_regex_for_matching_urls
        var url_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;

        // Expand values inside simple string templates with {placeholders}
        function t(template, info) {
            if (typeof template === "string") {
                var result = template;
                for (var key in info) {
                    var val = info[key];
                    result = result.replace(new RegExp('{' + key + '}', 'g'), val === null ? '' : val);
                }
                return result;
            } else return template(info);
        }
        // Export the t function for use when passing a function as the 'template' option
        $.extend({ tweet: { t: t} });

        function replacer(regex, replacement) {
            return function () {
                var returning = [];
                this.each(function () {
                    returning.push(this.replace(regex, replacement));
                });
                return $(returning);
            };
        }

        $.fn.extend({
            linkUrl: replacer(url_regexp, function (match) {
                var url = (/^[a-z]+:/i).test(match) ? match : "http://" + match;
                return "<a href=\"" + url + "\">" + match + "</a>";
            }),
            linkUser: replacer(/@(\w+)/gi, "@<a href=\"http://" + s.twitter_url + "/$1\">$1</a>"),
            // Support various latin1 (\u00**) and arabic (\u06**) alphanumeric chars
            linkHash: replacer(/(?:^| )[\#]+([\w\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u00ff\u0600-\u06ff]+)/gi,
                         ' <a href="http://' + s.twitter_search_url + '/search?q=&tag=$1&lang=all' + ((s.username && s.username.length == 1) ? '&from=' + s.username.join("%2BOR%2B") : '') + '">#$1</a>'),
            capAwesome: replacer(/\b(awesome)\b/gi, '<span class="awesome">$1</span>'),
            capEpic: replacer(/\b(epic)\b/gi, '<span class="epic">$1</span>'),
            makeHeart: replacer(/(&lt;)+[3]/gi, "<tt class='heart'>&#x2665;</tt>")
        });

        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 = s.seconds_ago_text.replace(/%d/, delta);
            } else if (delta < 120) {
                r = s.a_minutes_ago_text;
            } else if (delta < (45 * 60)) {
                r = s.minutes_ago_text.replace(/%d/, (parseInt(delta / 60, 10)).toString());
            } else if (delta < (2 * 60 * 60)) {
                r = s.a_hours_ago_text;
            } else if (delta < (24 * 60 * 60)) {
                r = s.hours_ago_text.replace(/%d/, (parseInt(delta / 3600, 10)).toString());
            } else if (delta < (48 * 60 * 60)) {
                r = s.a_day_ago_text;
            } else {
                r = s.days_ago_text.replace(/%d/, (parseInt(delta / 86400, 10)).toString());
            }
            return r;
        }

        function build_auto_join_text(text) {
            if (text.match(/^(@([A-Za-z0-9-_]+)) .*/i)) {
                return s.auto_join_text_reply;
            } else if (text.match(url_regexp)) {
                return s.auto_join_text_url;
            } else if (text.match(/^((\w+ed)|just) .*/im)) {
                return s.auto_join_text_ed;
            } else if (text.match(/^(\w*ing) .*/i)) {
                return s.auto_join_text_ing;
            } else {
                return s.auto_join_text_default;
            }
        }

        function build_api_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?page=" + s.page + "&per_page=" + count + "&callback=?";
            } else if (s.favorites) {
                return proto + "//" + s.twitter_api_url + "/favorites/" + s.username[0] + ".json?page=" + s.page + "&count=" + 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' : '') + '&page=' + s.page + '&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 + '&page=' + s.page + '&callback=?';
            }
        }

        // Convert twitter API objects into data available for
        // constructing each tweet <li> using a template
        function extract_template_data(item) {
            var o = {};
            o.item = item;
            o.source = item.source;
            o.screen_name = item.from_user || item.user.screen_name;
            o.avatar_size = s.avatar_size;
            o.avatar_url = item.profile_image_url || item.user.profile_image_url;
            o.retweet = typeof (item.retweeted_status) != 'undefined';
            o.tweet_time = parse_date(item.created_at);
            o.join_text = s.join_text == "auto" ? build_auto_join_text(item.text) : s.join_text;
            o.tweet_id = item.id_str;
            o.twitter_base = "http://" + s.twitter_url + "/";
            o.user_url = o.twitter_base + o.screen_name;
            o.tweet_url = o.user_url + "/status/" + o.tweet_id;
            o.reply_url = o.twitter_base + "intent/tweet?in_reply_to=" + o.tweet_id;
            o.retweet_url = o.twitter_base + "intent/retweet?tweet_id=" + o.tweet_id;
            o.favorite_url = o.twitter_base + "intent/favorite?tweet_id=" + o.tweet_id;
            o.retweeted_screen_name = o.retweet && item.retweeted_status.user.screen_name;
            o.tweet_relative_time = relative_time(o.tweet_time);
            o.tweet_raw_text = o.retweet ? ('RT @' + o.retweeted_screen_name + ' ' + item.retweeted_status.text) : item.text; // avoid '...' in long retweets
            o.tweet_text = $([o.tweet_raw_text]).linkUrl().linkUser().linkHash()[0];
            o.tweet_text_fancy = $([o.tweet_text]).makeHeart().capAwesome().capEpic()[0];

            // Default spans, and pre-formatted blocks for common layouts
            o.user = t('<a class="tweet_user" href="{user_url}">{screen_name}</a>', o);
            o.join = s.join_text ? t(' <span class="tweet_join">{join_text}</span> ', o) : ' ';
            o.avatar = o.avatar_size ?
        t('<a class="tweet_avatar" href="{user_url}"><img src="{avatar_url}" height="{avatar_size}" width="{avatar_size}" alt="{screen_name}\'s avatar" title="{screen_name}\'s avatar" border="0"/></a>', o) : '';
            o.time = t('<span class="tweet_time"><a href="{tweet_url}" title="{view_text}">{tweet_relative_time}</a></span>', o);
            o.text = t('<span class="tweet_text">{tweet_text_fancy}</span>', o);
            o.reply_action = t('<a class="tweet_action tweet_reply" href="{reply_url}">reply</a>', o);
            o.retweet_action = t('<a class="tweet_action tweet_retweet" href="{retweet_url}">retweet</a>', o);
            o.favorite_action = t('<a class="tweet_action tweet_favorite" href="{favorite_url}">favorite</a>', o);
            return o;
        }

        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];
            }

            if (s.loading_text) $(widget).append(loading);
            $(widget).bind("tweet:load", function () {
                $.getJSON("/twitter.json?wrapthis=" + escape(build_api_url()) + '&callback=?', function (data) {
                    if (s.loading_text) loading.remove();
                    if (s.intro_text) list.before(intro);
                    list.empty();

                    var tweets = $.map(data.results || data, extract_template_data);
                    tweets = $.grep(tweets, s.filter).sort(s.comparator).slice(0, s.count);
                    list.append($.map(tweets, function (o) { return "<li>" + t(s.template, o) + "</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("tweet:load"); }, 1000 * s.refresh_interval);
                    }
                });
            }).trigger("tweet:load");
        });
    };
})(jQuery);