<?php
//
//  class-ai1ec-app-controller.php
//  all-in-one-events-calendar
//
//  Created by The Seed Studio on 2011-07-13.
//


/**
 * Ai1ec_App_Controller class
 *
 * @package Controllers
 * @author The Seed Studio
 **/
class Ai1ec_App_Controller {
	/**
	 * _instance class variable
	 *
	 * Class instance
	 *
	 * @var null | object
	 **/
	private static $_instance = NULL;

	/**
	 * page_content class variable
	 *
	 * String storing page content for output by the_content()
	 *
	 * @var null | string
	 **/
	private $page_content = NULL;

	/**
	 * get_instance function
	 *
	 * Return singleton instance
	 *
	 * @return object
	 **/
	static function get_instance() {
		if( self::$_instance === NULL ) {
			self::$_instance = new self();
		}

		return self::$_instance;
	}

	/**
	 * Constructor
	 *
	 * Default constructor - application initialization
	 **/
	private function __construct()
 	{
		global $wpdb,
		       $ai1ec_app_helper,
		       $ai1ec_events_controller,
		       $ai1ec_importer_controller,
		       $ai1ec_settings_controller,
		       $ai1ec_settings;

		// register_activation_hook
		register_activation_hook( AI1EC_PLUGIN_NAME . '/' . AI1EC_PLUGIN_NAME . '.php', array( &$this, 'rewrite_flush' ) );

		// Configure MySQL to operate in GMT time
		$wpdb->query( "SET time_zone = '+0:00'" );

		// Install/update database schema as necessary
		$this->install_schema();

		// Install/update cron as necessary
		$this->install_cron();

		// ===========
		// = ACTIONS =
		// ===========
		// Create custom post type
		add_action( 'init', 											        array( &$ai1ec_app_helper, 'create_post_type' ) );
		// Handle ICS export requests
		add_action( 'init', 											        array( &$this, 'parse_standalone_request' ) );
		// General initialization
		add_action( 'init',                               array( &$ai1ec_events_controller, 'init' ) );
		// Register The Events Calendar importer
		add_action( 'admin_init',                         array( &$ai1ec_importer_controller, 'register_importer' ) );
		// add content for our custom columns
		add_action( "manage_posts_custom_column",         array( &$ai1ec_app_helper, 'custom_columns' ), 10, 2 );
		// Add filtering dropdowns for event categories and tags
		add_action( 'restrict_manage_posts', 			        array( &$ai1ec_app_helper, 'taxonomy_filter_restrict_manage_posts' ) );
		// Trigger display of page in front-end depending on request
		add_action( 'template_redirect', 					        array( &$this, 'route_request' ) );
		// Add meta boxes to event creation/edit form
		add_action( 'add_meta_boxes', 						        array( &$ai1ec_app_helper, 'add_meta_boxes' ) );
		// Save event data when post is saved
		add_action( 'save_post', 									        array( &$ai1ec_events_controller, 'save_post' ) );
		// Delete event data when post is deleted
		add_action( 'delete_post',                        array( &$ai1ec_events_controller, 'delete_post' ) );
		// cron job hook
		add_action( 'ai1ec_cron',						 			        array( &$ai1ec_importer_controller, 'cron' ) );
		add_action( 'events_categories_add_form_fields',  array( &$ai1ec_events_controller, 'events_categories_add_form_fields' ) );
		add_action( 'events_categories_edit_form_fields', array( &$ai1ec_events_controller, 'events_categories_edit_form_fields' ) );
		add_action( 'created_events_categories',          array( &$ai1ec_events_controller, 'created_events_categories' ) );
		add_action( 'edited_events_categories',           array( &$ai1ec_events_controller, 'edited_events_categories' ) );
		add_action( 'admin_notices',                      array( &$ai1ec_app_helper, 'admin_notices' ) );
    add_action( 'admin_enqueue_scripts',              array( &$ai1ec_settings_controller, 'admin_enqueue_scripts' ) );

		// ===========
		// = FILTERS =
		// ===========
		add_filter( 'posts_orderby',                    				array( &$ai1ec_app_helper, 'orderby' ), 10, 2 );
		// add custom column names and change existing columns
		add_filter( 'manage_ai1ec_event_posts_columns', 				array( &$ai1ec_app_helper, 'change_columns' ) );
		// filter the post lists by custom filters
		add_filter( 'parse_query', 															array( &$ai1ec_app_helper, 'taxonomy_filter_post_type_request' ) );
		// Filter event post content, in single- and multi-post views
		add_filter( 'the_content', 															array( &$ai1ec_events_controller, 'event_content' ) );
		// Override excerpt filters for proper event display in excerpt form
		add_filter( 'get_the_excerpt', 													array( &$ai1ec_events_controller, 'event_excerpt' ), 11 );
		add_filter( 'the_excerpt', 															array( &$ai1ec_events_controller, 'event_excerpt_noautop' ), 11 );
		remove_filter( 'the_excerpt', 													'wpautop', 10 );
		// Update event post update messages
		add_filter( 'post_updated_messages',  									array( &$ai1ec_events_controller, 'post_updated_messages' ) );
		// Sort the custom columns
		add_filter( 'manage_edit-ai1ec_event_sortable_columns', array( &$ai1ec_app_helper, 'sortable_columns' ) );
		add_filter( 'map_meta_cap', 														array( &$ai1ec_app_helper, 'map_meta_cap' ), 10, 4 );
		// Inject event categories, only in front-end, depending on setting
		if( $ai1ec_settings->inject_categories && ! is_admin() ) {
			add_filter( 'get_terms',                              array( &$ai1ec_app_helper, 'inject_categories' ), 10, 3 );
			add_filter( 'wp_list_categories',                     array( &$ai1ec_app_helper, 'selected_category_link' ), 10, 2 );
		}
		// Rewrite event category URLs to point to calendar page
		add_filter( 'term_link',                                array( &$ai1ec_app_helper, 'calendar_term_link' ), 10, 3 );

		// ========
		// = AJAX =
		// ========
		// Add iCalendar feed
		add_action( 'wp_ajax_ai1ec_add_ics',    array( &$ai1ec_settings_controller, 'add_ics_feed' ) );
		// Delete iCalendar feed
		add_action( 'wp_ajax_ai1ec_delete_ics', array( &$ai1ec_settings_controller, 'delete_ics_feed' ) );
		// Flush iCalendar feed
		add_action( 'wp_ajax_ai1ec_flush_ics',  array( &$ai1ec_settings_controller, 'flush_ics_feed' ) );
		// Update iCalendar feed
		add_action( 'wp_ajax_ai1ec_update_ics', array( &$ai1ec_settings_controller, 'update_ics_feed' ) );
	}

	/**
	 * rewrite_flush function
	 *
	 * Get permalinks to work when activating the plugin
	 *
	 * @return void
	 **/
	function rewrite_flush() {
		global $ai1ec_app_helper;
		$ai1ec_app_helper->create_post_type();
		flush_rewrite_rules( true );
	}

	/**
	 * install_schema function
	 *
	 * This function sets up the database, and upgrades it if it is out of date.
	 *
	 * @return void
	 **/
	function install_schema() {
		global $wpdb;

		// If existing DB version is not consistent with current plugin's version,
		// or does not exist, then create/update table structure using dbDelta().
		if( get_option( 'ai1ec_db_version' ) != AI1EC_DB_VERSION )
		{
			// =======================
			// = Create table events =
			// =======================
			$table_name = $wpdb->prefix . 'ai1ec_events';
			$sql = "CREATE TABLE $table_name (
					post_id 					bigint(20) NOT NULL,
					start 						datetime NOT NULL,
					end 							datetime,
					allday 						tinyint(1) NOT NULL,
					recurrence_rules 	longtext,
					exception_rules 	longtext,
					recurrence_dates 	longtext,
					exception_dates 	longtext,
					venue 						varchar(255),
					country 					varchar(255),
					address 					varchar(255),
					city 							varchar(255),
					province 					varchar(255),
					postal_code 			varchar(32),
					show_map 					tinyint(1),
					contact_name 			varchar(255),
					contact_phone 		varchar(32),
					contact_email 		varchar(128),
					cost 							varchar(255),
					ical_feed_url 		varchar(255),
					ical_source_url 	varchar(255),
					ical_organizer 		varchar(255),
					ical_contact 			varchar(255),
					ical_uid 					varchar(255),
					PRIMARY KEY  (post_id)
				) CHARACTER SET utf8;";

			// ==========================
			// = Create table instances =
			// ==========================
			$table_name = $wpdb->prefix . 'ai1ec_event_instances';
			$sql .= "CREATE TABLE $table_name (
					id 			bigint(20) NOT NULL AUTO_INCREMENT,
					post_id bigint(20) NOT NULL,
					start 	datetime NOT NULL,
					end 		datetime NOT NULL,
					PRIMARY KEY  (id)
				) CHARACTER SET utf8;";

			// ======================
			// = Create table feeds =
			// ======================
			$table_name = $wpdb->prefix . 'ai1ec_event_feeds';
			$sql .= "CREATE TABLE $table_name (
					feed_id			 	bigint(20) NOT NULL AUTO_INCREMENT,
					feed_url 			varchar(255) NOT NULL,
					feed_category bigint(20) NOT NULL,
					feed_tags 		varchar(255) NOT NULL,
					PRIMARY KEY  (feed_id)
				) CHARACTER SET utf8;";

      // ================================
			// = Create table category colors =
			// ================================
			$table_name = $wpdb->prefix . 'ai1ec_event_category_colors';
			$sql .= "CREATE TABLE $table_name (
          term_id 			bigint(20) NOT NULL,
          term_color    varchar(255) NOT NULL,
					PRIMARY KEY  (term_id)
				) CHARACTER SET utf8;";

			require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
			dbDelta( $sql );

			update_option( 'ai1ec_db_version', AI1EC_DB_VERSION );
		}
	}

	/**
	 * install_cron function
	 *
	 * This function sets up the cron job for updating the events, and upgrades it if it is out of date.
	 *
	 * @return void
	 **/
	function install_cron() {
		// If existing CRON version is not consistent with current plugin's version,
		// or does not exist, then create/update cron using
		if( get_option( 'ai1ec_cron_version' ) != AI1EC_CRON_VERSION ) {
			global $ai1ec_settings;
			// delete our scheduled crons
			wp_clear_scheduled_hook( 'ai1ec_cron' );
			// set the new cron
			wp_schedule_event( time(), $ai1ec_settings->cron_freq, 'ai1ec_cron' );
			// update the cron version
			update_option( 'ai1ec_cron_version', AI1EC_CRON_VERSION );
		}
	}

	/**
	 * setup_menus function
	 * Adds the hook to admin_menu that is pointing to menu member function
	 *
	 * @return void
	 **/
	function setup_menus() {
		add_action( "admin_menu", array( &$this, "menu" ) );
	}

	/**
	 * menu function
	 * Display the admin menu items using the add_menu_page WP function.
	 *
	 * @return void
	 **/
	function menu() {
		global $ai1ec_settings_controller,
		       $ai1ec_settings_helper,
		       $ai1ec_settings;

		// =================
		// = Settings Page =
		// =================
		$ai1ec_settings->settings_page = add_submenu_page(
			'edit.php?post_type=' . AI1EC_POST_TYPE,
			__( 'Settings', AI1EC_PLUGIN_NAME ),
			__( 'Settings', AI1EC_PLUGIN_NAME ),
			'manage_options',
			AI1EC_PLUGIN_NAME . "-settings",
			array( &$ai1ec_settings_controller, "view" )
		);
		// Create a hook for adding meta boxes
  	add_action( "load-{$ai1ec_settings->settings_page}", array( &$ai1ec_settings_helper, 'add_meta_boxes') );
  	// Load the meta boxes
  	add_action( "load-{$ai1ec_settings->settings_page}", array( &$ai1ec_settings_controller, 'add_meta_boxes' ) );
  	// Use registered handlers to hook loading of styles/scripts
    add_action( 'admin_print_styles-' . $ai1ec_settings->settings_page, array( &$ai1ec_settings_controller, 'admin_print_styles' ) );
    add_action( 'admin_print_scripts-' . $ai1ec_settings->settings_page, array( &$ai1ec_settings_controller, 'admin_print_scripts' ) );
	}


	/**
	 * route_request function
	 *
	 * Determines if the page viewed should be handled by this plugin, and if so
	 * schedule new content to be displayed.
	 *
	 * @return void
	 **/
	function route_request() {
		global $ai1ec_settings,
		       $ai1ec_calendar_controller,
		       $ai1ec_events_controller;

		// Find out if we're on the calendar page
		if( is_page( $ai1ec_settings->calendar_page_id ) )
		{
			ob_start();
			// Render view
			$ai1ec_calendar_controller->view();
			// Save page content to local variable
			$this->page_content = ob_get_contents();
			ob_end_clean();

			// Replace page content
			add_filter( 'the_content', array( &$this, 'append_content' ) );
		}
	}

	/**
	 * parse_standalone_request function
	 *
	 * @return void
	 **/
	function parse_standalone_request() {
		global $ai1ec_exporter_controller,
					 $ai1ec_app_helper;

		$plugin     = $ai1ec_app_helper->get_param('plugin');
    $action     = $ai1ec_app_helper->get_param('action');
    $controller = $ai1ec_app_helper->get_param('controller');

		if( ! empty( $plugin ) && $plugin == AI1EC_PLUGIN_NAME && ! empty( $controller ) && ! empty( $action ) ) {
			if( $controller == "ai1ec_exporter_controller" ) :
			  switch( $action ) :
			    case 'export_events':
			      $ai1ec_exporter_controller->export_events();
			      break;
			  endswitch;
			endif; // ai1ec_exporter_controller
		}
	}

	/**
	 * append_content function
	 *
	 * Append locally generated content to normal page content (if in the loop;
	 * don't want to do it for all instances of the_content() on the page!)
	 *
	 * @param string $content Post/Page content
	 * @return string         Post/Page content
	 **/
	function append_content( $content )
	{
		// Enclose entire content (including any admin-provided page content) in
		// the calendar container div
		if( in_the_loop() )
			$content =
				'<div id="ai1ec-container" class="ai1ec-container">' .
				$content . $this->page_content .
				'</div>';

		return $content;
	}
}
// END class