<?php

	/**
	 * Elgg wire plugin
	 * The wire is simple twitter like plugin that allows users to post notes to the wire
	 * 
	 * @package ElggTheWire
	 */

	/**
	 * thewire initialisation
	 *
	 * These parameters are required for the event API, but we won't use them:
	 * 
	 * @param unknown_type $event
	 * @param unknown_type $object_type
	 * @param unknown_type $object
	 */

		function thewire_init() {
			
			// Load system configuration
				global $CONFIG;
				
			// Set up menu for logged in users
				add_menu(elgg_echo('thewire:title'), "pg/thewire");
				
			// Extend system CSS with our own styles, which are defined in the thewire/css view
				elgg_extend_view('css','thewire/css');
				
			//extend views
				elgg_extend_view('profile/status', 'thewire/profile_status');
				
			// Register a page handler, so we can have nice URLs
				register_page_handler('thewire','thewire_page_handler');
				
			// Register a URL handler for thewire posts
				register_entity_url_handler('thewire_url','object','thewire');
				
			// Your thewire widget
				add_widget_type('thewire',elgg_echo("thewire:read"),elgg_echo("thewire:yourdesc"));
				
			// Register entity type
				register_entity_type('object','thewire');
				
			// Listen for SMS create event
			elgg_register_event_handler('create','object','thewire_incoming_sms');
			
			// Register granular notification for this type
			if (is_callable('register_notification_object'))
				register_notification_object('object', 'thewire', elgg_echo('thewire:newpost'));
			
			// Listen to notification events and supply a more useful message for SMS'
			elgg_register_plugin_hook_handler('notify:entity:message', 'object', 'thewire_notify_message');
		}
		
		function thewire_pagesetup() {
			
			global $CONFIG;

			//add submenu options
				if (elgg_get_context() == "thewire") {
					if ((elgg_get_page_owner_guid() == get_loggedin_userid() || !elgg_get_page_owner_guid()) && isloggedin()) {
						add_submenu_item(elgg_echo('thewire:read'),$CONFIG->wwwroot."pg/thewire/" . get_loggedin_user()->username);
						add_submenu_item(elgg_echo('thewire:everyone'),$CONFIG->wwwroot."mod/thewire/everyone.php");
						//add_submenu_item(elgg_echo('thewire:add'),$CONFIG->wwwroot."mod/thewire/add.php");
					} 
				}
			
		}
		
		/**
		 * thewire page handler; allows the use of fancy URLs
		 *
		 * @param array $page From the page_handler function
		 * @return true|false Depending on success
		 */
		function thewire_page_handler($page) {
			
			// The first component of a thewire URL is the username
			if (isset($page[0])) {
				set_input('username',$page[0]);
			}
			
			// The second part dictates what we're doing
			if (isset($page[1])) {
				switch($page[1]) {
					case "friends":		// TODO: add friends thewire page here
										break;
				}
			// If the URL is just 'thewire/username', or just 'thewire/', load the standard thewire index
			} else {
				require(dirname(__FILE__) . "/index.php");
				return true;
			}
			
			return false;
			
		}

		function thewire_url($thewirepost) {
			return "pg/thewire/" . $thewirepost->getOwnerEntity()->username;
		}
		
		/**
		 * Returns a more meaningful message for SMS messages.
		 *
		 * @param unknown_type $hook
		 * @param unknown_type $entity_type
		 * @param unknown_type $returnvalue
		 * @param unknown_type $params
		 */
		function thewire_notify_message($hook, $entity_type, $returnvalue, $params)
		{
			$entity = $params['entity'];
			$to_entity = $params['to_entity'];
			$method = $params['method'];
			if (($entity instanceof ElggEntity) && ($entity->getSubtype() == 'thewire'))
			{
				$descr = $entity->description;
				if ($method == 'sms') {
					$owner = $entity->getOwnerEntity();
					return $owner->username . ': ' . $descr;
				}
				if ($method == 'email') {
					$owner = $entity->getOwnerEntity();
					return $owner->username . ': ' . $descr . "\n\n" . $entity->getURL();
				}
			}
			return null;
		}
		
		/**
		 * Create a new wire post.
		 *
		 * @param string $post The post
		 * @param int $access_id Public/private etc
		 * @param int $parent Parent post (if any)
		 * @param string $method The method (default: 'site')
		 * @return bool
		 */
		function thewire_save_post($post, $access_id, $parent=0, $method = "site")
		{
			
			global $SESSION; 
			
			// Initialise a new ElggObject
			$thewire = new ElggObject();
			
			// Tell the system it's a thewire post
			$thewire->subtype = "thewire";
			
			// Set its owner to the current user
			$thewire->owner_guid = get_loggedin_userid();
			
			// For now, set its access to public (we'll add an access dropdown shortly)
			$thewire->access_id = $access_id;
			
			// Set its description appropriately
			$thewire->description = elgg_substr(strip_tags($post), 0, 160);
			
			// add some metadata
			$thewire->method = $method; //method, e.g. via site, sms etc
			$thewire->parent = $parent; //used if the note is a reply
			
			//save
			$save = $thewire->save();

			if($save)
				add_to_river('river/object/thewire/create','create',$SESSION['user']->guid,$thewire->guid);
			
			return $save;

		}
		
		/**
		 * Listen and process incoming SMS'
		 */
		function thewire_incoming_sms($event, $object_type, $object)
		{
			if (($object) && ($object->subtype == get_subtype_id('object', 'sms')))
			{
				// Get user from phone number
				if ((is_plugin_enabled('smsclient')) && (is_plugin_enabled('smslogin')))
				{
					// By this stage the owner should be logged in (requires SMS Login)
					if (thewire_save_post($object->description, get_default_access(), 0, 'sms'))
						return false;
					
				}
			}
					
			return true; // always create the shout even if it can't be sent
		}
	
	// Make sure the thewire initialisation function is called on initialisation
		elgg_register_event_handler('init','system','thewire_init');
		elgg_register_event_handler('pagesetup','system','thewire_pagesetup');
		
	// Register actions
		global $CONFIG;
		elgg_register_action("thewire/add", $CONFIG->pluginspath . "thewire/actions/add.php");
		elgg_register_action("thewire/delete", $CONFIG->pluginspath . "thewire/actions/delete.php");
		
?>