// jquery.tweet.js - See http://tweet.seaofclouds.com/ or https://github.com/seaofclouds/tweet for more info
// Copyright (c) 2008-2011 Todd Matthews & Steve Purcell
(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}{join}{text}{time}",   // [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);

		// 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 && !s.list) ? '&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 = 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_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=?';
			}
		}

		function extract_avatar_url(item, secure) {
			if (secure) {
				return ('user' in item) ?
				item.user.profile_image_url_https :
				extract_avatar_url(item, false);
			} 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;
			o.avatar_size = s.avatar_size;
			o.avatar_url = extract_avatar_url(item, (document.location.protocol === 'https:'));
			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_ago">{tweet_relative_time}</span>', o);
			o.text = t('{tweet_text_fancy}', 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 = $('.tweetlist').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(build_api_url(), 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 "<p class=\"tweet\">" + t(s.template, o) + "</p>";
					}).join(''));
					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);