<?php
/**
 * Blogs
 *
 * @package Blog
 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
 * @author Curverider Ltd
 * @copyright Curverider Ltd 2008-2010
 * @link http://elgg.org/
 *
 * @todo
 *
 * Show all your drafts
 * Show revision history
 *
 * Show your blog posts
 * Show friends blog posts
 *
 * Group blogs
 * 	Forward to container instead of owner
 * 	GROUPS SUCK.
 *
 * Pingbacks
 * Notifications
 */

/**
 * Init blog plugin.
 *
 * @return TRUE
 */
function blog_init() {
	global $CONFIG;
	require_once dirname(__FILE__) . '/blog_lib.php';

	// Set up menus
	add_menu(elgg_echo('blog'), "{$CONFIG->wwwroot}pg/blog/", array());

	elgg_extend_view('css', 'blog/css');

	register_page_handler('blog', 'blog_page_handler');
	register_page_handler('blog_ajax', 'blog_ajax_page_handler');

	register_entity_url_handler('blog_url_handler', 'object', 'blog');

	// notifications
	register_notification_object('object', 'blog', elgg_echo('blog:newpost'));
	register_plugin_hook('notify:entity:message', 'object', 'blog_notify_message');

	// pingbacks
	//register_elgg_event_handler('create', 'object', 'blog_incoming_ping');
	//register_plugin_hook('pingback:object:subtypes', 'object', 'blog_pingback_subtypes');

	// Register for search.
	register_entity_type('object','blog');

	//add_group_tool_option('blog', elgg_echo('blog:enableblog'), true);
	add_widget_type('blog', elgg_echo('blog'), elgg_echo('blog:widget:description'), 'profile, dashboard');

	$action_path = dirname(__FILE__) . '/actions/blog';

	register_action('blog/save', FALSE, "$action_path/save.php");
	register_action('blog/delete', FALSE, "$action_path/delete.php");
}

/**
 * Dispatches blog pages.
 * To maintain URL backward compatibility, expects old-style URLs like:
 * 	pg/blog/[username/[read|edit|archive|new/[time_start|guid/[time_end|title]]]]
 *
 * Without a username, show all blogs
 * Without an action (read|edit|archive|new), forward to pg/blog/username/read.
 * Without a guid, show all post for that user.
 * Title is ignored
 *
 * If archive, uses time_start/end
 *
 * @todo There is no way to say "show me archive view for all blog posts" with the
 * current URL scheme because $param[0] is the username instead of an action.
 * Could do something hideous like make '*' mean "all users" (since a username can't be *).
 * Can't change the URL scheme because of URL compatibility.
 *
 * @param array $page
 * @return NULL
 */
function blog_page_handler($page) {
	global $CONFIG;

	elgg_push_breadcrumb(elgg_echo('blog:blogs'), "{$CONFIG->site->url}pg/blog");

	// see if we're showing all or just a user's
	if (isset($page[0]) && !empty($page[0])) {
		$username = $page[0];

		// forward away if invalid user.
		if (!$user = get_user_by_username($username)) {
			register_error('blog:error:unknown_username');
			forward($_SERVER['HTTP_REFERER']);
		}

		set_page_owner($user->getGUID());
		$crumbs_title = sprintf(elgg_echo('blog:owned_blogs'), $user->name);
		$crumbs_url = "{$CONFIG->site->url}pg/blog/$username/read";
		elgg_push_breadcrumb($crumbs_title, $crumbs_url);

		$action = isset($page[1]) ? $page[1] : FALSE;
		// yeah these are crap names, but they're used for different things.
		$page2 = isset($page[2]) ? $page[2] : FALSE;
		$page3 = isset($page[3]) ? $page[3] : FALSE;

		switch ($action) {
			case 'read':
				$title = sprintf(elgg_echo('blog:title:user_blogs'), $user->name);
				$content = elgg_view('page_elements/content_header', array('context' => $content, 'type' => 'blog'));
				$content .= blog_get_page_content_read($user->getGUID(), $page2);
				break;

			case 'new':
			case 'edit':
				$content = blog_get_page_content_edit($page2);
				break;

			case 'archives':
				$content = elgg_view('page_elements/content_header', array('context' => $content, 'type' => 'blog'));
				$content .= blog_get_page_content_archive($user->getGUID(), $page2, $page3);
				break;

			case 'friends':
				$content = elgg_view('page_elements/content_header', array('context' => $content, 'type' => 'blog'));
				$content .= blog_get_page_content_archive($user->getGUID());
				break;

			default:
				forward("pg/blog/{$username}/read/");
				break;
		}
	} else {
		$title = elgg_echo('blog:title:all_blogs');
		$content = elgg_view('page_elements/content_header', array('context' => $content, 'type' => 'blog'));
		$content .= elgg_list_entities_from_metadata(array(
			'type' => 'object',
			'subtype' => 'blog',
			'full_view' => FALSE,
			'metadata_name_value_pair' => array('name' => 'status', 'value' => 'final')
		));
	}

	$sidebar = elgg_view('blog/sidebar_menu');
	$content = elgg_view('navigation/breadcrumbs') . $content;

	$body = elgg_view_layout('one_column_with_sidebar', $content, $sidebar);

	page_draw($title, $body);
}

/**
 * Handles ajax calls for blog.
 *
 * @param array $page
 */
function blog_ajax_page_handler($page) {
	$action = isset($page[0]) ? $page[0] : FALSE;

	var_dump($page);

	switch ($action) {
		case 'save_draft':
			// @todo recycle the save action
			$values = array(
				'title' => '',
				'description' => '',
				'status' => 'draft',
				'access_id' => ACCESS_DEFAULT,
				'comments_on' => 'On',
				'excerpt' => '',
				'tags' => '',
				'container_guid' => '',
				'guid' => ''
			);

			foreach ($values as $name => $default) {
				$values[$name] = get_input($name, $default);
			}


			/*
			If a title and body, create a blog post marked as a draft and update the
			GUID
			*/
			break;

		default:
			$content = 0;
			break;
	}

	exit;
}


/**
 * Format and return the correct URL for blogs.
 *
 * @param ElggObject $entity
 * @return string URL of blog.
 */
function blog_url_handler($entity) {
	global $CONFIG;

	if (!$user = get_entity($entity->owner_guid)) {
		// default to a standard view if no owner.
		return FALSE;
	}

	$friendly_title = friendly_title($entity->title);

	$url = "{$CONFIG->site->url}pg/blog/{$user->username}/read/{$entity->getGUID()}/$friendly_title";
	return $url;
}


register_elgg_event_handler('init', 'system', 'blog_init');