function Comments(modules) {
	var comments = modules.cache.make(function(threadId) {
		return modules.async.bind(
			modules.async.http({method: 'GET', url: url(threadId)}),
			function(queryResult) {
				if(queryResult.status == 200) {
					try {
						return modules.async.wrap(render(JSON.parse(queryResult.responseText)));
					} catch(e) {
						return modules.async.fail('Server returned invalid JSON for ' + url);
					}
				} else {
					return modules.async.fail('Could not load comments at ' + url);
				}
			}
		);
	})
	return {
		get: get
	};

	function url(threadId) {
		return blog.path.commentsAt + '/api/v1/statuses/' + threadId + '/context';
	}

	function get(articleKey) {
		var threadId = blog.articles[articleKey].metadata.comments;
		if(blog.path.commentsAt != undefined && threadId != undefined) {
			var ul = modules.dom.make('ul');
			modules.async.run(
				modules.async.bind(
					comments.get(threadId),
					modules.async.map(function(comments) {
						comments.forEach(function(comment) {ul.appendChild(comment);});
					})
				)
			);
			return emptySection(ul, threadId);
		} else {
			return [];
		}
	}

	function emptySection(ul, threadId) {
		return [modules.dom.make('div', {class: 'comments'}, [
			modules.dom.make('h2', {innerText: 'Comments'}),
			ul,
			modules.dom.make('a', {
				href: blog.path.commentsAt + '/notice/' + threadId,
				innerText: 'Comment on the fediverse'
			})
		])];
	}

	function render(comments) {
		return comments.descendants.map(function(descendant) {
			return modules.dom.make('li', {}, [
				modules.dom.make('cite', {}, [
					modules.dom.make('a', {
						href: descendant.account.url,
						innerText: descendant.account.username
					}),
					modules.dom.make('p', {innerText: descendant.created_at}),
					modules.dom.make('div', {innerHTML: descendant.content})
				])
			]);
		});
	}
}