// TODO - add full support for the "open graph" meta elements
// TODO - add more specifics to each service, such as buzz "imageurl"
if (!window.OPENLIKE) {
	window.OPENLIKE = {
		assetHost: 'http://openlike.org',
		util: {
			update: function() {
				var obj = arguments[0], i = 1, len=arguments.length, attr;
				for (; i<len; i++) {
					for (attr in arguments[i]) {
						obj[attr] = arguments[i][attr];
					}
				}
				return obj;
			},
			escape: function(s) {
				return ((s == null) ? '' : s)
					.toString()
					.replace(/[<>"&\\]/g, function(s) {
						switch(s) {
							case '<': return '&lt;';
							case '>': return '&gt;';
							case '"': return '\"';
							case '&': return '&amp;';
							case '\\': return '\\\\';
							default: return s;
						}
					});
			},
			notundef: function(a, b) {
				return typeof(a) == 'undefined' ? b : a;
			}
		}
	};
}

if (!OPENLIKE.Widget) {
	OPENLIKE.Widget = function(cfg) {
		// Params for cfg
		//
		//   header -- the header text (or none) to give the widget (default 'Like this:')
		//   s -- array -- list of sites to share to (has a default)
		//   css -- string (or false) -- url for the css (optional, *only used in first OPENLIKE.Widget call*)
		//   url -- string -- the url of the object to like (default window.location.href)
		//   title -- string -- the title of the object to like (default document.title)
		//   type -- string -- the type of the object to like, e.g. product, activity, sport, bar, company (optional)
		var defaults = {
				s: ['facebook', 'hunch', 'digg', 'reddit', 'stumbleupon'],
				url: window.location.href,
				title: document.title,
				header: 'Like this:',
				css: OPENLIKE.assetHost + '/v1/openlike.css',
				category: ''
			},
			i, len, wrapper, title, list, li, a, source,
			css;
		cfg = OPENLIKE.util.update(defaults, cfg);

		// Add CSS
		if (!OPENLIKE.Widget._initialized) {
			OPENLIKE.Widget._initialized = true;
			if (cfg.css) {
				css = document.createElement('LINK');
				css.rel = 'stylesheet';
				css.type = 'text/css';
				css.href = cfg.css;
				(document.getElementsByTagName('HEAD')[0] || document.body).appendChild(css);
			}
		}

		// Get current script object
		var script = document.getElementsByTagName('SCRIPT');
		script = script[script.length - 1];

		// Build Widget
		wrapper = document.createElement('DIV');
		wrapper.className = 'openlike';
		if (cfg.header) {
			title = document.createElement('P');
			title.innerHTML = OPENLIKE.util.escape(cfg.header);
			wrapper.appendChild(title);
		}

		list = document.createElement('UL');
		for (i=0, len=cfg.s.length; i<len; i++) {
			if (source = OPENLIKE.Sources[cfg.s[i]]) {
				source = OPENLIKE.prepSource(cfg.s[i], source);
				li = document.createElement('LI');
				if (source.html) {
					a = source.html(cfg);
				} else {
					a = document.createElement('A');
					a.className = source.klass;
					a.href = '#';
					a.innerHTML = OPENLIKE.util.escape(source.name);
					if (source.title) a.title = source.title;
					if (source.like) a.onclick = source.like(cfg);
					if (source.basicLink) {
						a.href = source.basicLink(a, cfg);
						if (source.popup) {
							a.onclick = function(url, target, attrs) {
								return function() {
									window.open(url, target, attrs);
									return false;
								};
							}(a.href, source.popup.target, source.popup.attrs);
						}
						a.target = source.target;
					}
				}
				li.appendChild(a);
				list.appendChild(li);
			}
		}
		wrapper.appendChild(list);

		script.parentNode.insertBefore(wrapper, script);
		wrapper = title = list = li = script = source = null;
	};

	OPENLIKE.prepSource = function(name, source) {
		source = OPENLIKE.util.update({}, source);
		source.name = name;
		source.target = OPENLIKE.util.notundef(source.target, '_blank');
		source.klass = 'openlike-' + OPENLIKE.util.escape(name);
		if (source.popup) {
			if (typeof(source.popup) != 'object') source.popup = {};
			source.popup.target = OPENLIKE.util.notundef(source.popup.target, '_blank');
			source.popup.attrs = OPENLIKE.util.notundef(source.popup.attrs, 'width=360,height=360');
		}
		return source;
	};

	// Sources that can be used out-of-box (in alphabetical order)
	// The OPENLIE.Sources object can be extended in a separate js file
	OPENLIKE.Sources = {
		digg: {
			url: 'http://digg.com/',
			basicLink: function(a, cfg) {
				var url = encodeURIComponent(cfg.url),
					title = encodeURIComponent(cfg.title);
				return 'http://digg.com/submit?phase=2&url=' + url + '&title=' + title;
			},
			title: 'Like this on Digg'
		},
                fb: {
                   html: function(cfg) {
                      var elt = document.createElement('div');
                      elt.setAttribute('class','fb-like');
                      elt.setAttribute('data-send','true');
                      elt.setAttribute('data-layout','button_count');
                      elt.setAttribute('data-width',250);
                      elt.setAttribute('data-show-faces','false');
                      elt.setAttribute('href',cfg.url);
                      OPENLIKE.util.update(elt);
                      return elt;
                   }
                },
		facebook: {
			html: function(cfg) {
				// <iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fdevelopers.facebook.com%2F&amp;layout=button_count&amp;show_faces=false&amp;width=25&amp;action=like&amp;colorscheme=light" scrolling="no" frameborder="0" allowTransparency="true" style="border:none; overflow:hidden; width:25px; height:px"></iframe>
				var elt = document.createElement('IFRAME'),
					width = 53;
				elt.src = 'http://www.facebook.com/plugins/like.php?href=' + encodeURIComponent(cfg.url) + '&amp;layout=button_count&amp;show_faces=false&amp;width=' + width + '&amp;action=like&amp;colorscheme=light';
				OPENLIKE.util.update(elt, {scrolling: 'no', frameBorder: '0', allowTransparency: 'true'});
				OPENLIKE.util.update(elt.style, {border: 'none', overflow: 'hidden', width: width+'px', height: '24px', padding: '1px 0 0 0'});
				return elt;
			},
			url: 'http://facebook.com',
			basicLink: function(a, cfg) {
				var url = encodeURIComponent(cfg.url),
					title = encodeURIComponent(cfg.title);
				return 'http://www.facebook.com/sharer.php?u=' + url + '&t=' + title;
			}
		},
                plus: {
                  html: function(cfg) {
                    var tagelt = document.createElement('g:plusone');
                    tagelt.setAttribute('href',cfg.url);
                    OPENLIKE.util.update(tagelt);
                    return tagelt;
                  },

                  url: 'http://plus.google.com',
                  basicLink: function(a, cfg) {
                     var url = encodeURIComponent(cfg.url),
                         title = encodeURIComponent(cfg.title);
                     return 'http://plus.google.com/';
                  }

                },
		google: {
			url: 'http://google.com',
			basicLink: function(a, cfg) {
				var url = encodeURIComponent(cfg.url),
					msg = encodeURIComponent('I like this... ' + cfg.title);
					// add srcURL too?
				return 'http://www.google.com/buzz/post?message=' + msg + '&url=' + url;
			},
			title: 'Like this on Google Buzz'
		},
		hunch: {
			url: 'http://hunch.com',
			basicLink: function(a, cfg) {
				var url = encodeURIComponent(cfg.url),
					title = encodeURIComponent(cfg.title),
					category = cfg.type ? '&category=' + encodeURIComponent(cfg.type) : '';
				return 'http://hunch.com/openlike/?url=' + url + '&title=' + title + category;
			},
			popup: {
				target: '_blank',
				attrs: 'width=610,height=600'
			},
			title: 'Add this to your Hunch taste profile'
		},
		reddit: {
			url: 'http://reddit.com/',
			basicLink: function(a, cfg) {
				var url = encodeURIComponent(cfg.url),
					title = encodeURIComponent(cfg.title);
				return 'http://www.reddit.com/submit?url=' + url + '&title=' + title;
			},
			title: 'Like this on Reddit'
		},
		stumbleupon: {
			url: 'http://www.stumbleupon.com/',
			basicLink: function(a, cfg) {
				var url = encodeURIComponent(cfg.url);
				return 'http://www.stumbleupon.com/submit?url=' + url;
			},
			title: 'Like this on StumbleUpon'
		},
		twitter: {
			url: 'http://twitter.com',
			basicLink: function(a, cfg) {
				var msg = encodeURIComponent('I like this: ' + cfg.title + ' -- ' + cfg.url + ' #tindeck');
				return 'http://twitter.com/home?status=' + msg;
			},
			title: 'Tweet this like'
		}
	};
}