// jquery.tweet.js - see http://tweet.seaofclouds.com/ or https://github.com/seaofclouds/tweet for more info
// copyright (c) 2008-2012 todd matthews & steve purcell
(function (factory) {
    if (typeof define === 'function' && define.amd) {
        define(['jquery'], factory);
    } // amd support for requirejs etc.
    else {
        factory(jquery);
    }
}(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 (use 'list' option for multiple names, where possible)
            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 (see also: http://search.twitter.com/operators)
            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
            li_class: "", //list style
            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;
            }
            // you can attach callbacks to the following events using jquery's standard .bind() mechanism:
            //   "loaded" -- triggered when tweets have been fetched and rendered
        }, o);

        // see http://daringfireball.net/2010/07/improved_regex_for_matching_urls
        var url_regexp = /\b((?:https?:\/\/|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?芦禄鈥溾€濃€樷€橾))/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.split('{' + key + '}').join(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);
            };
        }

        function escapehtml(s) {
            return s.replace(/</g, "&lt;").replace(/>/g, "^&gt;");
        }

        $.fn.extend({
            linkuser: replacer(/(^|[\w])@(\w+)/gi, "$1<span class=\"at\">@</span><a href=\"http://" + s.twitter_url + "/$2\">$2</a>"),
            // support various latin1 (\u00**) and arabic (\u06**) alphanumeric chars
            linkhash: replacer(/(?:^| )[\#]+([\w\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u00ff\u0600-\u06ff]+)/gi, ' <a href="https://twitter.com/search?q=%23$1&lang=all' + ((s.username && s.username.length === 1 && !s.list) ? '&from=' + s.username.join("%2bor%2b") : '') + '" class="tweet_hashtag">#$1</a>'),
            makeheart: replacer(/(&lt;)+[3]/gi, "<tt class='heart'>&#x2665;</tt>")
        });

        function linkurls(text, entities) {
            return text.replace(url_regexp, function (match) {
                var url = (/^[a-z]+:/i).test(match) ? match : "http://" + match;
                var text = match;
                for (var i = 0; i < entities.length; ++i) {
                    var entity = entities[i];
                    if (entity.url === url && entity.expanded_url) {
                        url = entity.expanded_url;
                        text = entity.display_url;
                        break;
                    }
                }
                return "<a href=\"" + escapehtml(url) + "\">" + escapehtml(text) + "</a>";
            });
        }

        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 extract_relative_time(date) {
            var toint = function (val) {
                return parseint(val, 10);
            };
            var relative_to = new date();
            var delta = toint((relative_to.gettime() - date) / 1000);
            if (delta < 1) {
                delta = 0;
            }
            return {
                days: toint(delta / 86400),
                hours: toint(delta / 3600),
                minutes: toint(delta / 60),
                seconds: toint(delta)
            };
        }

        function format_relative_time(time_ago) {
            if (time_ago.days > 2) {
                return 'about ' + time_ago.days + ' days ago';
            }
            if (time_ago.hours > 24) {
                return 'about a day ago';
            }
            if (time_ago.hours > 2) {
                return 'about ' + time_ago.hours + ' hours ago';
            }
            if (time_ago.minutes > 45) {
                return 'about an hour ago';
            }
            if (time_ago.minutes > 2) {
                return 'about ' + time_ago.minutes + ' minutes ago';
            }
            if (time_ago.seconds > 1) {
                return 'about ' + time_ago.seconds + ' seconds ago';
            }
            return 'just now';
        }

        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() {
            return s.twitter_api_url;
        }

        function extract_avatar_url(item, secure) {
            if (secure) {
                return ('user' in item) ? item.user.profile_image_url_https : extract_avatar_url(item, false).replace(/^http:\/\/[a-z0-9]{1,3}\.twimg\.com\//, "https://s3.amazonaws.com/twitter_production/");
            } else {
                return item.profile_image_url || item.user.profile_image_url;
            }
        }

        // 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;
            // the actual user name is not returned by all twitter apis, so please do not
            // file an issue if it is empty:
            o.name = item.from_user_name || item.user.name;
            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 = format_relative_time(extract_relative_time(o.tweet_time));
            o.entities = item.entities ? (item.entities.urls || []).concat(item.entities.media || []) : [];
            o.tweet_raw_text = o.retweet ? ('rt @' + o.retweeted_screen_name + ' ' + item.retweeted_status.text) : item.text; // avoid '...' in long retweets
            o.tweet_text = $([linkurls(o.tweet_raw_text, o.entities)]).linkuser().linkhash()[0];
            o.retweeted_tweet_text = $([linkurls(item.text, o.entities)]).linkuser().linkhash()[0];
            o.tweet_text_fancy = $([o.tweet_text]).makeheart()[0];

            o.avatar_size = s.avatar_size;
            o.avatar_url = extract_avatar_url(o.retweet ? item.retweeted_status : item, (document.location.protocol === 'https:'));
            o.avatar_screen_name = o.retweet ? o.retweeted_screen_name : o.screen_name;
            o.avatar_profile_url = o.twitter_base + o.avatar_screen_name;

            // 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="{avatar_profile_url}"><img src="{avatar_url}" height="{avatar_size}" width="{avatar_size}" alt="{avatar_screen_name}\'s avatar" title="{avatar_screen_name}\'s avatar" border="0"/></a>', o) : '';
            o.time = t('<span class="tweet_time"><a href="{tweet_url}" title="view tweet on twitter">{tweet_relative_time}</a></span>', o);
            o.text = t('<span class="tweet_text">{tweet_text_fancy}</span>', o);
            o.retweeted_text = t('<span class="tweet_text">{retweeted_tweet_text}</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;
        }

        function render_tweets(widget, tweets) {
            var list = $('<ul class="tweet_list list-unstyled">');
            list.append($.map(tweets,function (o) {
                        return "<li" + (s.li_class ? ' class="' + s.li_class + '"' : '') + ">" + 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');

            $(widget).append(list);
            if (s.intro_text) {
                list.before('<p class="tweet_intro">' + s.intro_text + '</p>');
            }
            if (s.outro_text) {
                list.after('<p class="tweet_outro">' + s.outro_text + '</p>');
            }

            $(widget).trigger("loaded").trigger((tweets.length === 0 ? "empty" : "full"));
            if (s.refresh_interval) {
                window.settimeout(function () {
                    $(widget).trigger("tweet:load");
                }, 1000 * s.refresh_interval);
            }
        }

        function load(widget) {
            var loading = $('<p class="loading">' + s.loading_text + '</p>');
            if (s.loading_text) {
                $(widget).not(":has(.tweet_list)").empty().append(loading);
            }
            $.getjson(build_api_url(), function (data) {
                var tweets = $.map(data.results || data, extract_template_data);
                tweets = $.grep(tweets, s.filter).sort(s.comparator).slice(0, s.count);
                $(widget).trigger("tweet:retrieved", [tweets]);
            });
        }

        return this.each(function (i, widget) {
            if (s.username && typeof(s.username) === "string") {
                s.username = [s.username];
            }

            $(widget).unbind("tweet:render").unbind("tweet:retrieved").unbind("tweet:load").bind({
                        "tweet:load": function () {
                            load(widget);
                        },
                        "tweet:retrieved": function (ev, tweets) {
                            $(widget).trigger("tweet:render", [tweets]);
                        },
                        "tweet:render": function (ev, tweets) {
                            render_tweets($(widget), tweets);
                        }
                    }).trigger("tweet:load");
        });
    };
}));