<?php
//To prevent conflicts, only one version of the plugin can be activated at any given time.
if ( defined( 'BLC_ACTIVE' ) ) {
	trigger_error(
		'Another version of Broken Link Checker is already active. Please deactivate it before activating this one.',
		E_USER_ERROR
	);
} else {

	define( 'BLC_ACTIVE', true );

	//Fail fast if the WP version is unsupported. The $wp_version variable may be obfuscated by other
	//plugins, so use function detection to determine the version. get_post_stati was introduced in WP 3.0.0
	if ( ! function_exists( 'get_post_stati' ) ) {
		trigger_error(
			'This version of Broken Link Checker requires WordPress 3.0 or later!',
			E_USER_ERROR
		);
	}

	/***********************************************
					Debugging stuff
	************************************************/
	//define('BLC_DEBUG', true);

	/***********************************************
					Constants
	************************************************/

	/**
	* For performance, some internal APIs used for retrieving multiple links, instances or containers
	* can take an optional "$purpose" argument. Those APIs will try to use this argument to pre-load
	* any DB data required for the specified purpose ahead of time.

	* For example, if you're loading a bunch of link containers for the purposes of parsing them and
	* thus set $purpose to BLC_FOR_PARSING, the relevant container managers will (if applicable) precache
	* the parse-able fields in each returned container object. Still, setting $purpose to any particular
	* value does not *guarantee* any data will be preloaded - it's only a suggestion that it should.

	* The currently supported values for the $purpose argument are :
	*/
	define( 'BLC_FOR_EDITING', 'edit' );
	define( 'BLC_FOR_PARSING', 'parse' );
	define( 'BLC_FOR_DISPLAY', 'display' );
	define( 'BLC_DATABASE_VERSION', 16 );

	/***********************************************
					Configuration
	************************************************/

	//Load and initialize the plugin's configuration
	require BLC_DIRECTORY_LEGACY . '/includes/config-manager.php';

	global $blc_config_manager;
	$blc_config_manager = new blcConfigurationManager(
		//Save the plugin's configuration into this DB option
		'wsblc_options',
		//Initialize default settings
		array(
			'max_execution_time'               => 7 * 60, // (in seconds) How long the worker instance may run, at most.
			'check_threshold'                  => 72,  // (in hours) Check each link every 72 hours.
			'recheck_count'                    => 3, // How many times a broken link should be re-checked.
			'recheck_threshold'                => 30 * 60, // (in seconds) Re-check broken links after 30 minutes.
			'run_in_dashboard'                 => true, // Run the link checker algo. continuously while the Dashboard is open.
			'run_via_cron'                     => true, // Run it hourly via WordPress pseudo-cron.
			'mark_broken_links'                => true, // Whether to add the broken_link class to broken links in posts.
			'broken_link_css'                  => ".broken_link, a.broken_link {\n\ttext-decoration: line-through;\n}",
			'nofollow_broken_links'            => false, // Whether to add rel="nofollow" to broken links in posts.
			'mark_removed_links'               => false, // Whether to add the removed_link class when un-linking a link.
			'removed_link_css'                 => ".removed_link, a.removed_link {\n\ttext-decoration: line-through;\n}",
			'exclusion_list'                   => array(), // Links that contain a substring listed in this array won't be checked.
			'send_email_notifications'         => true, // Whether to send the admin email notifications about broken links
			'send_authors_email_notifications' => false, // Whether to send post authors notifications about broken links in their posts.
			'notification_email_address'       => '', // If set, send email notifications to this address instead of the admin.
			'notification_schedule'            => apply_filters( 'blc_notification_schedule_filter', 'daily' ), // How often (at most) notifications will be sent. Possible values : 'daily', 'weekly'. There is no option for this so we've added a fitler for it.
			'last_notification_sent'           => 0, // When the last email notification was sent (Unix timestamp)
			'suggestions_enabled'              => true, // Whether to suggest alternative URLs for broken links.
			'warnings_enabled'                 => true, // Try to automatically detect temporary problems and false positives, and report them as "Warnings" instead of broken links.
			'server_load_limit'                => null, // Stop parsing stuff & checking links if the 1-minute load average goes over this value. Only works on Linux servers. 0 = no limit.
			'enable_load_limit'                => true, // Enable/disable load monitoring.
			'custom_fields'                    => array(), // List of custom fields that can contain URLs and should be checked.
			'acf_fields'                       => array(), // List of custom fields that can contain URLs and should be checked.
			'enabled_post_statuses'            => array( 'publish' ), // Only check posts that match one of these statuses
			'autoexpand_widget'                => true, // Autoexpand the Dashboard widget if broken links are detected
			'dashboard_widget_capability'      => 'edit_others_posts', // Only display the widget to users who have this capability
			'show_link_count_bubble'           => true, // Display a notification bubble in the menu when broken links are found
			'table_layout'                     => 'flexible', // The layout of the link table. Possible values : 'classic', 'flexible'
			'table_compact'                    => true, // Compact table mode on/off
			'table_visible_columns'            => array( 'new-url', 'status', 'used-in', 'new-link-text' ),
			'table_links_per_page'             => 30,
			'table_color_code_status'          => true, //Color-code link status text
			'need_resynch'                     => false, // [Internal flag] True if there are unparsed items.
			'current_db_version'               => 0, // The currently set-up version of the plugin's tables
			'timeout'                          => 30, // (in seconds) Links that take longer than this to respond will be treated as broken.
			'highlight_permanent_failures'     => false, // Highlight links that have appear to be permanently broken (in Tools -> Broken Links).
			'failure_duration_threshold'       => 3, // (days) Assume a link is permanently broken if it still hasn't recovered after this many days.
			'logging_enabled'                  => false,
			'log_file'                         => '',
			'incorrect_path'                   => false,
			'clear_log_on'                     => '',
			'custom_log_file_enabled'          => false,
			'installation_complete'            => false,
			'installation_flag_cleared_on'     => 0,
			'installation_flag_set_on'         => 0,
			'show_link_actions'                => array( 'blc-deredirect-action' => false ), //Visible link actions.
			'youtube_api_key'                  => '',
			'blc_post_modified'                => '',
		)
	);

	/***********************************************
					Logging
	************************************************/

	include BLC_DIRECTORY_LEGACY . '/includes/logger.php';

	global $blclog;
	if ( $blc_config_manager->get( 'logging_enabled', false ) && is_writable( $blc_config_manager->get( 'log_file' ) ) ) {
		$blclog = new blcFileLogger( $blc_config_manager->get( 'log_file' ) );
	} else {
		$blclog = new blcDummyLogger;
	}

	/*
	if ( defined('BLC_DEBUG') && constant('BLC_DEBUG') ){
		//Load FirePHP for debug logging
		if ( !class_exists('FB') && file_exists(BLC_DIRECTORY_LEGACY . '/FirePHPCore/fb.php4') ) {
			require_once BLC_DIRECTORY_LEGACY . '/FirePHPCore/fb.php4';
		}
		//FB::setEnabled(false);
	}
	//to comment out all calls : (^[^\/]*)(FB::)  ->  $1\/\/$2
	//to uncomment : \/\/(\s*FB::)  ->   $1
	//*/

	/***********************************************
					Global functions
	************************************************/

	/**
	 * Get the configuration object used by Broken Link Checker.
	 *
	 * @return blcConfigurationManager
	 */
	function blc_get_configuration() {
		return $GLOBALS['blc_config_manager'];
	}

	/**
	 * Notify the link checker that there are unsynched items
	 * that might contain links (e.g. a new or edited post).
	 *
	 * @return void
	 */
	function blc_got_unsynched_items() {
		$conf = blc_get_configuration();

		if ( ! $conf->options['need_resynch'] ) {
			$conf->options['need_resynch'] = true;
			$conf->save_options();
		}
	}

	/**
	 * (Re)create synchronization records for all containers and mark them all as unparsed.
	 *
	 * @param bool $forced If true, the plugin will recreate all synch. records from scratch.
	 * @return void
	 */
	function blc_resynch( $forced = false ) {
		global $wpdb, $blclog;

		if ( $forced ) {
			$blclog->info( '... Forced resynchronization initiated' );

			//Drop all synchronization records
			$wpdb->query( "TRUNCATE {$wpdb->prefix}blc_synch" );
		} else {
			$blclog->info( '... Resynchronization initiated' );
		}

		//Remove invalid DB entries
		blc_cleanup_database();

		//(Re)create and update synch. records for all container types.
		$blclog->info( '... (Re)creating container records' );
		blcContainerHelper::resynch( $forced );

		$blclog->info( '... Setting resync. flags' );
		blc_got_unsynched_items();

		//All done.
		$blclog->info( 'Database resynchronization complete.' );
	}

	/**
	 * Delete synch. records, instances and links that refer to missing or invalid items.
	 *
	 * @return void
	 */
	function blc_cleanup_database() {
		global $blclog;

		//Delete synch. records for container types that don't exist
		$blclog->info( '... Deleting invalid container records' );
		blcContainerHelper::cleanup_containers();

		//Delete invalid instances
		$blclog->info( '... Deleting invalid link instances' );
		blc_cleanup_instances();

		//Delete orphaned links
		$blclog->info( '... Deleting orphaned links' );
		blc_cleanup_links();
	}

	/***********************************************
					Utility hooks
	************************************************/

	/**
	 * Adds the following cron schedules:
	 * - 10min: every 10 minutes.
	 * - weekly: once per week.
	 * - bimonthly : twice per month.
	 *
	 * @param array $schedules Existing Cron schedules.
	 * @return array
	 */
	function blc_cron_schedules( $schedules ) {

		if ( ! isset( $schedules['10min'] ) ) {
			$schedules['10min'] = array(
				'interval' => 600,
				'display'  => __( 'Every 10 minutes' ),
			);
		}

		if ( ! isset( $schedules['weekly'] ) ) {
			$schedules['weekly'] = array(
				'interval' => 604800, //7 days
				'display'  => __( 'Once Weekly' ),
			);
		}
		if ( ! isset( $schedules['bimonthly'] ) ) {
			$schedules['bimonthly'] = array(
				'interval' => 15 * 24 * 2600, //15 days
				'display'  => __( 'Twice a Month' ),
			);
		}

		return $schedules;
	}
	add_filter( 'cron_schedules', 'blc_cron_schedules' );

	/***********************************************
					Main functionality
	************************************************/

	require BLC_DIRECTORY_LEGACY . '/includes/activation.php';

	//Load the plugin if installed successfully
	if ( $blc_config_manager->options['installation_complete'] ) {
		function blc_init() {
			global $blc_module_manager, $blc_config_manager, $ws_link_checker;

			static $init_done = false;
			if ( $init_done ) {
				return;
			}
			$init_done = true;

			//Ensure the database is up to date
			if ( BLC_DATABASE_VERSION !== $blc_config_manager->options['current_db_version'] ) {
				require_once BLC_DIRECTORY_LEGACY . '/includes/admin/db-upgrade.php';
				blcDatabaseUpgrader::upgrade_database(); //Also updates the DB ver. in options['current_db_version'].
			}

			//Load the base classes and utilities
			require_once BLC_DIRECTORY_LEGACY . '/includes/links.php';
			require_once BLC_DIRECTORY_LEGACY . '/includes/link-query.php';
			require_once BLC_DIRECTORY_LEGACY . '/includes/instances.php';
			require_once BLC_DIRECTORY_LEGACY . '/includes/utility-class.php';

			//Load the module subsystem
			require_once BLC_DIRECTORY_LEGACY . '/includes/modules.php';

			//Load the modules that want to be executed in all contexts
			$blc_module_manager->load_modules();

			if ( is_admin() || defined( 'DOING_CRON' ) ) {

				//It's an admin-side or Cron request. Load the core.
				require_once BLC_DIRECTORY_LEGACY . '/core/core.php';
				$ws_link_checker = new wsBrokenLinkChecker( BLC_PLUGIN_FILE_LEGACY, $blc_config_manager );

			} else {

				//This is user-side request, so we don't need to load the core.
				//We might need to inject the CSS for removed links, though.
				if ( $blc_config_manager->options['mark_removed_links'] && ! empty( $blc_config_manager->options['removed_link_css'] ) ) {
					function blc_print_removed_link_css() {
						global $blc_config_manager;
						echo '<style type="text/css">',$blc_config_manager->options['removed_link_css'],'</style>';
					}
					add_action( 'wp_head', 'blc_print_removed_link_css' );
				}
			}
		}
		add_action( 'init', 'blc_init', 2000 );
	} else {
		//Display installation errors (if any) on the Dashboard.
		function blc_print_installation_errors() {
			global $blc_config_manager, $wpdb;

			if ( $blc_config_manager->options['installation_complete'] ) {
				return;
			}

			$messages = array(
				'<strong>' . __( 'Broken Link Checker installation failed. Try deactivating and then reactivating the plugin.', 'broken-link-checker' ) . '</strong>',
			);

			if ( ! $blc_config_manager->db_option_loaded ) {
				$messages[] = sprintf(
					'<strong>Failed to load plugin settings from the "%s" option.</strong>',
					$blc_config_manager->option_name
				);
				$messages[] = '';

				$serialized_config = $wpdb->get_var(
					$wpdb->prepare(
						"SELECT `option_value` FROM `$wpdb->options` WHERE `option_name` = %s",
						$blc_config_manager->option_name
					)
				);

				if ( null === $serialized_config ) {
					$messages[] = "Option doesn't exist in the {$wpdb->options} table.";
				} else {
					$messages[] = "Option exists in the {$wpdb->options} table and has the following value:";
					$messages[] = '';
					$messages[] = '<textarea cols="120" rows="20">' . htmlentities( $serialized_config ) . '</textarea>';
				}
			} else {
				$logger   = new blcCachedOptionLogger( 'blc_installation_log' );
				$messages = array_merge(
					$messages,
					array(
						'installation_complete = ' . ( isset( $blc_config_manager->options['installation_complete'] ) ? intval( $blc_config_manager->options['installation_complete'] ) : 'no value' ),
						'installation_flag_cleared_on = ' . $blc_config_manager->options['installation_flag_cleared_on'],
						'installation_flag_set_on = ' . $blc_config_manager->options['installation_flag_set_on'],
						'',
						'<em>Installation log follows :</em>',
					),
					$logger->get_messages()
				);
			}

			echo '<div class="error"><p>', implode( "<br>\n", $messages ), '</p></div>';
		}
		add_action( 'admin_notices', 'blc_print_installation_errors' );
	}
}
