define([
    "jquery",
    "underscore"
], function($, _) {
	
	var buttonShare = {
		extensionId: "buttonShare",
		extensionName: 'Button "Share"',
        optional: true,
		settingsBloc: '<p>Adds a "Share document" button in the navigation bar.</p>'
	};
	
	buttonShare.onCreateButton = function() {
		return $([
			'<button class="btn dropdown-toggle" data-toggle="dropdown" title="Share this document">',
				'<i class="icon-link"></i>',
			'</button>',
			'<div id="link-container" class="dropdown-menu pull-right">',
				'<div class="link-list"></div>',
				'<p class="no-link">To share this document you need first to ',
					'<a href="#" class="action-publish-gist">publish it as a Gist</a>',
					' in Markdown format.',
				'</p>',
				'<blockquote class="muted">',
					'<b>NOTE:</b> You can open any URL within StackEdit using ',
						'<a href="viewer.html?url=https://raw.github.com/benweet/stackedit/master/README.md"',
						'title="Sharing example">viewer.html?url=...</a>',
				'</blockquote>',
			'</div>'].join("")
		);
	};
	
	var fileDesc = undefined;
	var lineTemplate = [
        '<div class="input-prepend">',
			'<a href="<%= link %>" class="add-on" title="Sharing location"><i class="icon-link"></i></a>',
			'<input class="span2" type="text" value="<%= link %>" readonly />',
		'</div>'].join("");
	var refreshDocumentSharing = function(fileDescParameter) {
		if(fileDescParameter !== undefined && fileDescParameter !== fileDesc) {
			return;
		}
		
		var linkList = $("#link-container .link-list").empty();
		$("#link-container .no-link").show();
		
		var attributesList = _.values(fileDesc.publishLocations);
		_.each(attributesList, function(attributes) {
			if(attributes.sharingLink) {
				var lineElement = $(_.template(lineTemplate, {
					link: attributes.sharingLink
				}));
				lineElement.click(function(event) {
					event.stopPropagation();
				});
				linkList.append(lineElement);
				$("#link-container .no-link").hide();
			}
		});
	};
	
	buttonShare.onFileSelected = function(fileDescParameter) {
		fileDesc = fileDescParameter;
		refreshDocumentSharing(fileDescParameter);
	};
	
	buttonShare.onNewPublishSuccess = refreshDocumentSharing;
	buttonShare.onPublishRemoved = refreshDocumentSharing;
	
	return buttonShare;
	
});