/*
 * jQuery LiveTwitter 1.6.3
 * - Live updating Twitter plugin for jQuery
 *
 * Copyright (c) 2009-2010 Inge Jørgensen (elektronaut.no)
 * Licensed under the MIT license (MIT-LICENSE.txt)
 *
 * $Date: 2010/12/11$
 */

/*jslint browser: true, devel: true, onevar: false, immed: false, regexp: false */
/*global window: false, jQuery: false */

/*
 * Usage example:
 * $("#twitterSearch").liveTwitter('bacon', {limit: 10, rate: 15000});
 */


(function ($) {
	if (!$.fn.reverse) {
		$.fn.reverse = function () {
			return this.pushStack(this.get().reverse(), arguments);
		};
	}
	$.fn.liveTwitter = function (query, options, callback) {
		var domNode = this;
		$(this).each(function () {
			var settings = {};

			// Handle changing of options
			if (this.twitter) {
				settings = $.extend(this.twitter.settings, options);
				this.twitter.settings = settings;
				if (query) {
					this.twitter.query = query;
				}
				this.twitter.limit = settings.limit;
				this.twitter.mode  = settings.mode;
				if (this.twitter.interval) {
					this.twitter.refresh();
				}
				if (callback) {
					this.twitter.callback = callback;
				}

			// ..or create a new twitter object
			} else {
				// Extend settings with the defaults
				settings = $.extend({
					mode:      'search', // Mode, valid options are: 'search', 'user_timeline', 'list', 'home_timeline'
					rate:      15000,    // Refresh rate in ms
					limit:     10,       // Limit number of results
					imageSize: 0,       // Size of image in pixels
					refresh:   true,
					timeLinks: false,
					retweets:  false,
					service:   ''
				}, options);

				// Default setting for showAuthor if not provided
				if (typeof settings.showAuthor === "undefined") {
					settings.showAuthor = (settings.mode === 'user_timeline') ? false : true;
				}

				// Set up a dummy function for the Twitter API callback
				if (!window.twitter_callback) {
					window.twitter_callback = function () {
						return true;
					};
				}

				this.twitter = {
					settings:      settings,
					query:         query,
					limit:         settings.limit,
					mode:          settings.mode,
					interval:      false,
					container:     this,
					lastTimeStamp: 0,
					callback:      callback,

					// Convert the time stamp to a more human readable format
					relativeTime: function (timeString) {
						var parsedDate = Date.parse(timeString);
						var delta = (Date.parse(Date()) - parsedDate) / 1000;
						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 < (90 * 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 r;
					},

					// Update the timestamps in realtime
					refreshTime: function () {
						var twitter = this;
						$(twitter.container).find('span.time').each(function () {
							var time_element = twitter.settings.timeLinks ? $(this).find('a') : $(this);
							time_element.html(twitter.relativeTime(this.timeStamp));
						});
					},

					// Handle reloading
					refresh: function (initialize) {
						var twitter = this;
						if (this.settings.refresh || initialize) {
							var url = '';
							var params = {};
							if (twitter.mode === 'search') {
								if (this.query && this.query !== '') {
									params.q = this.query;
								}
								if (this.settings.geocode) {
									params.geocode = this.settings.geocode;
								}
								if (this.settings.lang) {
									params.lang = this.settings.lang;
								}
								if (this.settings.rpp) {
									params.rpp = this.settings.rpp;
								} else {
									params.rpp = this.settings.limit;
								}
								
								// Convert params to string
								var paramsString = [];
								for (var param in params) {
									if (params.hasOwnProperty(param)) {
										paramsString[paramsString.length] = param + '=' + encodeURIComponent(params[param]);
									}
								}
								paramsString = paramsString.join("&");
								if (settings.service.length > 0) {
									url = "http://" + settings.service + "/api/search.json?";
								} else {
									url = "http://search.twitter.com/search.json?";
								}
								url += paramsString + "&callback=?";
							} else if (twitter.mode === 'user_timeline' || twitter.mode === 'home_timeline') {
								if (settings.service.length > 0) {
									url = "http://" + settings.service + "/api/statuses/" + twitter.mode + "/" + encodeURIComponent(this.query) + ".json?count=" + twitter.limit + "&callback=?";
								} else {
									url = "http://api.twitter.com/1/statuses/" + twitter.mode + "/" + encodeURIComponent(this.query) + ".json?count=" + twitter.limit + "&callback=?";
									if (twitter.mode === 'user_timeline' && this.settings.retweets) {
										url += "&include_rts=1";
									}
								}
							} else if (twitter.mode === 'list') {
								var username = encodeURIComponent(this.query.user);
								var listname = encodeURIComponent(this.query.list);
								url = "http://api.twitter.com/1/" + username + "/lists/" + listname + "/statuses.json?per_page=" + twitter.limit + "&callback=?";
							}
							$.getJSON(url, function (json) {
								var results = null;
								if (twitter.mode === 'search') {
									results = json.results;
								} else {
									results = json;
								}
								var newTweets = 0;
								$(results).reverse().each(function () {
									var screen_name = '';
									var profile_image_url = '';
									var created_at_date = '';
									var tweet_url = '';
									if (twitter.mode === 'search') {
										screen_name = this.from_user;
										profile_image_url = this.profile_image_url;
										created_at_date = this.created_at;
									} else {
										screen_name = this.user.screen_name;
										profile_image_url = this.user.profile_image_url;
										// Fix for IE
										created_at_date = this.created_at.replace(/^(\w+)\s(\w+)\s(\d+)(.*)(\s\d+)$/, "$1, $3 $2$5$4");
									}
									if (settings.service.length > 0) {
										tweet_url = 'http://' + settings.service + '/notice/' + this.id;
									} else {
										tweet_url = 'http://twitter.com/' + screen_name + '/statuses/' + this.id;
									}
									var userInfo = this.user;
									var linkified_text = this.text.replace(/[A-Za-z]+:\/\/[A-Za-z0-9-_]+\.[A-Za-z0-9-_:%&\?\/.=]+/, function (m) { 
										return m.link(m); 
									});
									if (settings.service.length > 0) {
										linkified_text = linkified_text.replace(/@[A-Za-z0-9_]+/g, function (u) {
											return u.link('http://' + settings.service + '/' + u.replace(/^@/, ''));
										});
									} else {
										linkified_text = linkified_text.replace(/@[A-Za-z0-9_]+/g, function (u) {
											return u.link('http://twitter.com/' + u.replace(/^@/, ''));
										});
									}
									if (settings.service.length > 0) {
										linkified_text = linkified_text.replace(/#[A-Za-z0-9_\-]+/g, function (u) {
											return u.link('http://http://' + settings.service + '/search/notice?q=' + u.replace(/^#/, '%23'));
										});
									} else {
										linkified_text = linkified_text.replace(/#[A-Za-z0-9_\-]+/g, function (u) {
											return u.link('http://search.twitter.com/search?q=' + u.replace(/^#/, '%23'));
										});
									}
									
									if (!twitter.settings.filter || twitter.settings.filter(this)) {
										if (Date.parse(created_at_date) > twitter.lastTimeStamp) {
											newTweets += 1;
											var tweetHTML = '<div class="tweet tweet-' + this.id + '">';
											if (twitter.settings.showAuthor) {
												var profile_url = '';
												if (settings.service.length > 0) {
													profile_url = 'http://' + settings.service + '/' + screen_name;
												} else {
													profile_url = 'http://twitter.com/' + screen_name;
												}
												tweetHTML += 
													'<img width="' + settings.imageSize + '" height="' + settings.imageSize + '" src="' + profile_image_url + '" />' +
													'<p class="text"><span class="username"><a href="' + profile_url + '">' + screen_name + '</a>:</span> ';
											} else {
												tweetHTML += 
													'<p class="text"> ';
											}

											var timeText = twitter.relativeTime(created_at_date);
											var timeHTML = twitter.settings.timeLinks ? '<a href="' + tweet_url + '">' + timeText + '</a>' : timeText;

											tweetHTML += 
												linkified_text +
												' <span class="time">' + timeHTML + '</span>' +
												'</p>' +
												'</div>';
											$(twitter.container).prepend(tweetHTML);
											var timeStamp = created_at_date;
											$(twitter.container).find('span.time:first').each(function () {
												this.timeStamp = timeStamp;
											});
											if (!initialize) {
												$(twitter.container).find('.tweet-' + this.id).hide().fadeIn();
											}
											twitter.lastTimeStamp = Date.parse(created_at_date);
										}
									}
								});
								if (newTweets > 0) {
									// Limit number of entries
									$(twitter.container).find('div.tweet:gt(' + (twitter.limit - 1) + ')').remove();
									// Run callback
									if (twitter.callback) {
										twitter.callback(domNode, newTweets);
									}
									// Trigger event
									$(domNode).trigger('tweets');
								}
							});
						}	
					},
					start: function () {
						var twitter = this;
						if (!this.interval) {
							this.interval = setInterval(function () {
								twitter.refresh();
							}, twitter.settings.rate);
							this.refresh(true);
						}
					},
					stop: function () {
						if (this.interval) {
							clearInterval(this.interval);
							this.interval = false;
						}
					},
					clear: function () {
						$(this.container).find('div.tweet').remove();
						this.lastTimeStamp = null;
					}
				};
				var twitter = this.twitter;
				this.timeInterval = setInterval(function () {
					twitter.refreshTime();
				}, 5000);
				this.twitter.start();
			}
		});
		return this;
	};
})(jQuery);