<?php
/**
 * CRUD -- CRUD library
 *
 * @package        Lorea
 * @subpackage     CRUD
 *
 * Copyright 2012-2013 Lorea Faeries <federation@lorea.org>
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 */

/**
 * List crud objects in a group
 *
 * @param CrudTemplate $crud Crud template object
 * @param int $guid Group entity GUID
 */
function crud_handle_list_page($crud, $guid) {

	elgg_set_page_owner_guid($guid);

	$crud_type = $crud->crud_type;

	$parent = get_entity($guid);
	if ($parent instanceof ElggGroup) {
		$group = $parent;
		$parent = NULL;
	}
	else {
		$group = get_entity($parent->container_guid);
	}

	if (!$group) {
		register_error(elgg_echo('groups:notfound'));
		forward();
	}

	group_gatekeeper();

	elgg_push_breadcrumb($group->name);

	elgg_register_title_button();

	if (elgg_view_exists("forms/$crud->module/{$crud_type}_general")) {
		elgg_register_title_button($crud->crud_type, 'edit_general');
	}

	$title = elgg_echo("item:object:$crud_type");

	$params = array(
		'title' => $title,
		'content' => $crud->getListTabContent(),
		'footer' => elgg_view("$crud->module/{$crud_type}_general", array('entity' => $group)),
		'filter' => $crud->getListTabFilter(),
	);

	$params['sidebar'] .= elgg_view('crud/tagcloud_block', array(
		'subtypes' => $crud->crud_type,
		'owner_guid' => elgg_get_page_owner_guid(),
	));

	$body = elgg_view_layout('content', $params);

	echo elgg_view_page($title, $body);
}

/**
 * Edit or add a crud object
 *
 * @param CrudTemplate $crud Crud template object
 * @param string $type 'add' or 'edit'
 * @param int    $guid GUID of group or crud object
 */
function crud_handle_edit_page($crud, $type, $guid) {
	gatekeeper();

	$crud_type = $crud->crud_type;

	if ($type == 'add') {
		$parent = get_entity($guid);
		if ($parent instanceof ElggGroup) {
			$group = $parent;
			$parent = NULL;
		}
		else {
			$group = get_entity($parent->container_guid);
		}
		if (!$group) {
			register_error(elgg_echo('groups:notfound'));
			forward();
		}
		elgg_set_page_owner_guid($group->guid);

		// make sure user has permissions to add a crud object to container
		if (!$group->canWriteToContainer(0, 'object', $crud_type)) {
			register_error(elgg_echo('crud:permissions:error'));
			forward($group->getURL());
		}

		$title = elgg_echo($crud_type . ':add');

		if ($parent) {
			crud_push_breadcrumb('new', $parent);
		}
		else
			elgg_push_breadcrumb($group->name, $crud_type."/owner/$group->guid");
		elgg_push_breadcrumb($title);

		$body_vars = crud_prepare_form_vars($crud, NULL, $parent);
		$content = elgg_view_form('crud/save', array('crud' => $crud), $body_vars);
	} elseif ($type == 'edit_general') {
		$entity = get_entity($guid);
		if (!$entity || !$entity->canEdit()) {
			register_error(elgg_echo('groups:notfound'));
			forward();
		}
		$group = $entity;

		$title = elgg_echo($crud_type . ':edit_general');

		elgg_push_breadcrumb($group->name, $crud_type . "/owner/$group->guid");
		elgg_push_breadcrumb($title);

		$body_vars = crud_prepare_form_vars($crud, $entity, $parent);
		$content = elgg_view_form("$crud->module/{$crud_type}_general", array('crud' => $crud), $body_vars);

	} else {
		$entity = get_entity($guid);
		if (!$entity || !$entity->canEdit()) {
			register_error(elgg_echo('groups:notfound'));
			forward();
		}
		$group = $entity->getContainerEntity();
		if (!$group) {
			register_error(elgg_echo('groups:notfound'));
			forward();
		}
		$parent = get_entity($entity->parent_guid);

		$title = elgg_echo($crud_type . ':edit');

		elgg_push_breadcrumb($group->name, $crud_type . "/owner/$group->guid");
		elgg_push_breadcrumb($entity->title, $entity->getURL());
		elgg_push_breadcrumb($title);

		$body_vars = crud_prepare_form_vars($crud, $entity, $parent);
		$content = elgg_view_form('crud/save', array('crud' => $crud), $body_vars);
	}

	$params = array(
		'content' => $content,
		'title' => $title,
		'filter' => '',
	);
	$body = elgg_view_layout('content', $params);

	echo elgg_view_page($title, $body);
}

/**
 * Push breadcrumbs from the given crud object going up in the parent hirarchy
 *
 * @param ElggObject $last Ending object
 * @param ElggObject $entity Current object
 * @param CrudTemplate $crud Crud template object
 */
function crud_push_breadcrumb($last, $entity, $crud = NULL) {
	if (empty($crud)) {
		$crud = crud_get_handler($entity->getSubtype());
	}

	if ($entity->parent_guid) {
		$parent = get_entity($entity->parent_guid);
		crud_push_breadcrumb($last, $parent);
	}
	else {
		$group = $entity->getContainerEntity();
		elgg_push_breadcrumb($group->name, "$crud->crud_type/owner/$entity->container_guid");
	}
	
	$title = $entity->title;
	if (empty($title)) {
		$title = elgg_echo("$crud->module:$crud->crud_type");
	}
	if ($entity == $last)
		elgg_push_breadcrumb($title);
	else
		elgg_push_breadcrumb($title, "$crud->crud_type/view/$entity->guid");
}

/**
 * View a crud object
 *
 * @param CrudTemplate $crud Crud template object
 * @param int $guid GUID of a crud object
 */
function crud_handle_view_page($crud, $guid) {
	// We now have RSS on assemblies
	global $autofeed;
	$autofeed = true;

	$crud_type = $crud->crud_type;

	$entity = get_entity($guid);
	$parent = $entity->getParentEntity();
	if ($parent instanceof ElggGroup) {
		$group = $parent;
		$parent = NULL;
	}
	else {
		$group = get_entity($entity->container_guid);
	}

	if (!$group) {
		register_error(elgg_echo('noaccess'));
		$_SESSION['last_forward_from'] = current_page_url();
		forward('');
	}

	/*$group = $entity->getContainerEntity();
	if (!$group) {
		register_error(elgg_echo('groups:notfound'));
		forward();
	}*/

	if (!empty($crud->children_type) && $group->canWriteToContainer()) {
		elgg_set_page_owner_guid($guid);
		elgg_register_menu_item('title', array(
			'name' => 'add',
			'href' => "$crud->children_type/add/$guid",
			'text' => elgg_echo("$crud->children_type:add"),
			'link_class' => 'elgg-button elgg-button-action',
		));
	}
	elgg_trigger_plugin_hook("crud:$crud_type:view_buttons", 'view_buttons', array('crud'=>$crud, 'type'=>$crud_type, 'entity'=>$entity), $location);

	elgg_set_page_owner_guid($entity->container_guid);

	group_gatekeeper();

	crud_push_breadcrumb($entity, $entity, $crud);

	$content = elgg_view_entity($entity, array('full_view' => true));
	
	$content .= elgg_view_comments($entity);

	$params = array(
		'content' => $content,
		'title' => $entity->getTitle(true),
		'filter' => '',
	);
	
	$sidebar = elgg_view('crud/tagcloud_block', array(
                'subtypes' => $crud->crud_type,
                'owner_guid' => elgg_get_page_owner_guid(),
 	       ));
	if (isset($params['sidebar'])) {
		$params['sidebar'] .= $sidebar;
	} else {
		$params['sidebar'] = $sidebar;
	}


	$body = elgg_view_layout('content', $params);

	echo elgg_view_page($entity->title, $body);
}

/**
 * Prepare crud object form variables
 *
 * @param CrudTemplate $crud Crud template object
 * @param ElggObject $object Crud object if editing
 * @return array
 */
function crud_prepare_form_vars($crud, $object = NULL, $parent = NULL) {
	$crud_type = $crud->crud_type;
	if ($object)
		$guid = $object->guid;
	// input names => defaults
	$values = array(
		'title' => $object->title,
		'description' => $object->description,
		'access_id' => ACCESS_DEFAULT,
		'tags' => '',
		'crud' => $crud,
		'container_guid' => elgg_get_page_owner_guid(),
		'parent_guid' => $parent->guid,
		'guid' => $guid,
		'entity' => $object,
	);

	$variables = elgg_get_config($crud_type);
	foreach ($variables as $name => $type) {
		if (empty($values[$name])) {
			if ($type == 'date') {
				$values[$name] = time();
			}
			else {
				$values[$name] = '';
			}
		}
	}

	if ($object) {
		foreach (array_keys($values) as $field) {
			if (isset($object->$field)) {
				$values[$field] = $object->$field;
			}
		}
	}

	if (elgg_is_sticky_form($crud_type)) {
		$sticky_values = elgg_get_sticky_values($crud_type);
		foreach ($sticky_values as $key => $value) {
			$values[$key] = $value;
		}
	}

	elgg_clear_sticky_form($crud_type);

	return $values;
}