<?php
/**
 * Class for BackWPup logs display page
 */
class BackWPup_Page_Logs extends WP_List_Table {

	private static $listtable = NULL;
	private $job_types = NULL;
	public $log_folder = '';

	/**
	 *
	 */
	function __construct() {

		parent::__construct( array(
								  'plural'   => 'logs',
								  'singular' => 'log',
								  'ajax'     => TRUE
							 ) );

		$this->log_folder = get_site_option( 'backwpup_cfg_logfolder' );
		$this->log_folder = BackWPup_File::get_absolute_path( $this->log_folder );
		$this->log_folder = untrailingslashit( $this->log_folder );
	}

	/**
	 * @return bool
	 */
	function ajax_user_can() {

		return current_user_can( 'backwpup_logs' );
	}

	/**
	 *
	 */
	function prepare_items() {

		$this->job_types = BackWPup::get_job_types();

		$per_page = $this->get_items_per_page( 'backwpuplogs_per_page' );
		if ( empty( $per_page ) || $per_page < 1 ) {
			$per_page = 20;
		}

		//load logs
		$logfiles = array();
		if ( is_readable( $this->log_folder ) ) {
			$dir = new BackWPup_Directory( $this->log_folder );
			foreach ( $dir as $file ) {
				if ( $file->isFile() && $file->isReadable() && strpos( $file->getFilename(), 'backwpup_log_' ) !== false && strpos( $file->getFilename(), '.html' ) !== false ) {
					$logfiles[] = $file->getFilename();
				}
			}
		}

		//ordering
		$order   = isset( $_GET[ 'order' ] ) ? $_GET[ 'order' ] : 'desc';
		$orderby = isset( $_GET[ 'orderby' ] ) ? $_GET[ 'orderby' ] : 'time';
		if ( $orderby == 'time' ) {
			if ( $order == 'asc' ) {
				sort( $logfiles );
			} else {
				rsort( $logfiles );
			}
		}
		//by page
		$start = intval( ( $this->get_pagenum() - 1 ) * $per_page );
		$end   = $start + $per_page;
		if ( $end > count( $logfiles ) ) {
			$end = count( $logfiles );
		}

		$this->items = array();
		$i = -1;
		foreach ( $logfiles as $mtime => $logfile ) {
			$i++;
			if ( $i < $start ) {
				continue;
			}
			if ( $i >= $end ) {
				break;
			}
			$this->items[$mtime] = BackWPup_Job::read_logheader( $this->log_folder . '/' . $logfile );
			$this->items[$mtime]['file'] = $logfile;
		}

		$this->set_pagination_args( array(
										 'total_items' => count( $logfiles ),
										 'per_page'    => $per_page,
										 'orderby'     => $orderby,
										 'order'       => $order
									) );

	}

	/**
	 * @return array
	 */
	function get_sortable_columns() {

		return array(
			'time' => array( 'time', FALSE ),
		);
	}

	/**
	 *
	 */
	function no_items() {

		_e( 'No Logs.', 'backwpup' );
	}

	/**
	 * @return array
	 */
	function get_bulk_actions() {

		if ( ! $this->has_items() )
			return array ();

		$actions             = array();
		$actions[ 'delete' ] = __( 'Delete', 'backwpup' );

		return $actions;
	}

	/**
	 * @return array
	 */
	function get_columns() {
		$posts_columns              = array();
		$posts_columns[ 'cb' ]      = '<input type="checkbox" />';
		$posts_columns[ 'time' ]    = __( 'Time', 'backwpup' );
		$posts_columns[ 'job' ]     = __( 'Job', 'backwpup' );
		$posts_columns[ 'status' ]  = __( 'Status', 'backwpup' );
		$posts_columns[ 'type' ]    = __( 'Type', 'backwpup' );
		$posts_columns[ 'size' ]    = __( 'Size', 'backwpup' );
		$posts_columns[ 'runtime' ] = __( 'Runtime', 'backwpup' );

		return $posts_columns;
	}

	/**
	 * The cb Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_cb( $item ) {

		return '<input type="checkbox" name="logfiles[]" value="' .esc_attr( $item['file'] ) . '" />';
	}

	/**
	 * The job id Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_time( $item ) {
		$r = sprintf( __( '%1$s at %2$s', 'backwpup' ), date_i18n( get_option( 'date_format' ) , $item[ 'logtime' ], TRUE ), date_i18n( get_option( 'time_format' ), $item[ 'logtime' ], TRUE ) );
		return $r;
	}

	/**
	 * The type Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_type( $item ) {

		$r = '';
		if ( $types = explode( '+', $item[ 'type' ] ) ) {
			foreach ( $types as $type ) {
				if ( isset( $this->job_types[ $type ] ) ) {
					$r .= $this->job_types[ $type ]->info[ 'name' ] . '<br />';
				}
				else {
					$r .= $type . '<br />';
				}
			}
		}

		return $r;
	}

	/**
	 * The log Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_job( $item ) {

		$log_name = str_replace( array( '.html', '.gz' ), '', basename( $item['file'] ) );
		$r = "<strong><a class=\"thickbox\" href=\"" . admin_url( 'admin-ajax.php' ) . '?&action=backwpup_view_log&log=' . $log_name .'&_ajax_nonce=' . wp_create_nonce( 'view-log_' . $log_name ) . "&amp;TB_iframe=true&amp;width=640&amp;height=440\" title=\"" . esc_attr( $item['file'] ) . "\n" . sprintf( __( 'Job ID: %d', 'backwpup' ), $item[ 'jobid' ] ) . "\">" .  esc_html( ! empty( $item[ 'name' ] ) ? $item[ 'name' ] : $item['file'] ) . "</a></strong>";
		$actions               = array();
		$actions[ 'view' ]     = '<a class="thickbox" href="' . admin_url( 'admin-ajax.php' ) . '?&action=backwpup_view_log&log=' . $log_name .'&_ajax_nonce=' . wp_create_nonce( 'view-log_' . $log_name ) . '&amp;TB_iframe=true&amp;width=640&amp;height=440" title="' . $item['file'] . '">' . __( 'View', 'backwpup' ) . '</a>';
		if ( current_user_can( 'backwpup_logs_delete' ) ) {
			$actions[ 'delete' ]   = "<a class=\"submitdelete\" href=\"" . wp_nonce_url( network_admin_url( 'admin.php' ) . '?page=backwpuplogs&action=delete&paged=' . $this->get_pagenum() . '&logfiles[]=' . $item['file'], 'bulk-logs' ) . "\" onclick=\"return showNotice.warn();\">" . __( 'Delete', 'backwpup' ) . "</a>";
		}
		$actions[ 'download' ] = "<a href=\"" . wp_nonce_url( network_admin_url( 'admin.php' ) . '?page=backwpuplogs&action=download&file=' . $item['file'], 'download-log_' . $item['file'] ) . "\">" . __( 'Download', 'backwpup' ) . "</a>";
		$r .= $this->row_actions( $actions );

		return $r;
	}

	/**
	 * The status Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_status( $item ) {

		$r = '';
		if ( $item[ 'errors' ] ) {
			$r .= sprintf( '<span style="color:red;font-weight:bold;">' . _n( "1 ERROR", "%d ERRORS", $item[ 'errors' ], 'backwpup' ) . '</span><br />', $item[ 'errors' ] );
		}
		if ( $item[ 'warnings' ] ) {
			$r .= sprintf( '<span style="color:#e66f00;font-weight:bold;">' . _n( "1 WARNING", "%d WARNINGS", $item[ 'warnings' ], 'backwpup' ) . '</span><br />', $item[ 'warnings' ] );
		}
		if ( ! $item[ 'errors' ] && ! $item[ 'warnings' ] ) {
			$r .= '<span style="color:green;font-weight:bold;">' . __( 'O.K.', 'backwpup' ) . '</span>';
		}

		return $r;
	}


	/**
	 * The size Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_size( $item ) {

		if ( ! empty( $item[ 'backupfilesize' ] ) )
			return size_format( $item[ 'backupfilesize' ], 2 );
		else
			return __( 'Log only', 'backwpup' );
	}

	/**
	 * The runtime Column
	 *
	 * @param $item
	 * @return string
	 */
	function column_runtime( $item ) {

		return $item[ 'runtime' ] . ' ' . __( 'seconds', 'backwpup' );
	}

	/**
	 *
	 */
	public static function load() {

		//Create Table
		self::$listtable = new BackWPup_Page_Logs;

		switch ( self::$listtable->current_action() ) {
			case 'delete':
				if ( ! current_user_can( 'backwpup_logs_delete' ) )
					break;
				if ( is_array( $_GET[ 'logfiles' ] ) ) {
					check_admin_referer( 'bulk-logs' );
					foreach ( $_GET[ 'logfiles' ] as $logfile ) {
						$logfile = basename( $logfile );
						if ( is_writeable( self::$listtable->log_folder . '/' . $logfile ) && ! is_dir( self::$listtable->log_folder . '/' . $logfile ) && ! is_link( self::$listtable->log_folder . '/' . $logfile ) ) {
							unlink( self::$listtable->log_folder . '/' . $logfile );
						}
					}
				}
				break;
			case 'download': //Download Log
				if ( ! current_user_can( 'backwpup_logs' ) ) {
					break;
				}

				check_admin_referer( 'download-log_' . trim( $_GET[ 'file' ] ) );

				$log_file = trailingslashit( self::$listtable->log_folder ) . basename( trim( $_GET[ 'file' ] ) );
				$log_file = realpath( $log_file );

				if ( $log_file && is_readable( $log_file ) && ! is_dir( $log_file ) && !is_link( $log_file ) ) {
					if ( $level = ob_get_level() ) {
						for ( $i = 0; $i < $level; $i ++ ) {
							ob_end_clean();
						}
					}
					@set_time_limit( 300 );
					nocache_headers();
					header( 'Content-Description: File Transfer' );
					header( 'Content-Type: ' . BackWPup_Job::get_mime_type( $log_file ) );
					header( 'Content-Disposition: attachment; filename="' . basename( $log_file ) . '"' );
					header( 'Content-Transfer-Encoding: binary' );
					header( 'Content-Length: ' . filesize( $log_file ) );
					@readfile( $log_file );
					die();
				}
				else {
					header( 'HTTP/1.0 404 Not Found' );
					die();
				}
				break;
		}


		//Save per page
		if ( isset( $_POST[ 'screen-options-apply' ] ) && isset( $_POST[ 'wp_screen_options' ][ 'option' ] ) && isset( $_POST[ 'wp_screen_options' ][ 'value' ] ) && $_POST[ 'wp_screen_options' ][ 'option' ] == 'backwpuplogs_per_page' ) {
			check_admin_referer( 'screen-options-nonce', 'screenoptionnonce' );
			global $current_user;
			if ( $_POST[ 'wp_screen_options' ][ 'value' ] > 0 && $_POST[ 'wp_screen_options' ][ 'value' ] < 1000 ) {
				update_user_option( $current_user->ID, 'backwpuplogs_per_page', (int)$_POST[ 'wp_screen_options' ][ 'value' ] );
				wp_redirect( remove_query_arg( array( 'pagenum', 'apage', 'paged' ), wp_get_referer() ) );
				exit;
			}
		}

		add_screen_option( 'per_page', array(
											'label'   => __( 'Logs', 'backwpup' ),
											'default' => 20,
											'option'  => 'backwpuplogs_per_page'
									   ) );

		self::$listtable->prepare_items();
	}

	/**
	 *
	 * Output css
	 *
	 * @return void
	 */
	public static function admin_print_styles() {

		?>
		<style type="text/css" media="screen">
			.column-time {
				text-align: center;
			}

			.column-runtime, .column-time, .column-size {
				width: 8%;
			}

			.column-status {
				width: 10%;
			}

			.column-type {
				width: 15%;
			}
			@media screen and (max-width: 782px) {
				.column-type, .column-runtime, .column-size {
					display: none;
				}
				.column-time, .column-status {
					width: 18%;
				}
			}
		</style>
		<?php
	}

	/**
	 *
	 * Output js
	 *
	 * @return void
	 */
	public static function admin_print_scripts() {

		wp_enqueue_script( 'backwpupgeneral' );
	}

	/**
	 * Display the page content
	 */
	public static function page() {

		?>
		<div class="wrap" id="backwpup-page">
			<h1><?php echo esc_html( sprintf( __( '%s &rsaquo; Logs', 'backwpup' ), BackWPup::get_plugin_data( 'name' ) ) ); ?></h1>
			<?php BackWPup_Admin::display_messages(); ?>
			<form id="posts-filter" action="" method="get">
				<input type="hidden" name="page" value="backwpuplogs" />
				<?php self::$listtable->display(); ?>
				<div id="ajax-response"></div>
			</form>
		</div>
		<?php
	}

	/**
	 * For displaying log files with ajax
	 */
	public static function ajax_view_log() {

		if ( ! current_user_can( 'backwpup_logs' ) || ! isset( $_GET[ 'log' ] ) ||  strstr( $_GET[ 'log' ], 'backwpup_log_' ) === false ) {
			die( '-1' );
		}

		check_ajax_referer( 'view-log_' . $_GET[ 'log' ] );

		$log_folder = get_site_option( 'backwpup_cfg_logfolder' );
		$log_folder = BackWPup_File::get_absolute_path( $log_folder );
		$log_file = $log_folder . basename( trim( $_GET[ 'log' ] ) );

		if ( file_exists( $log_file . '.html' ) && is_readable( $log_file . '.html' ) ) {
			echo file_get_contents( $log_file . '.html', FALSE );
		} elseif ( file_exists( $log_file . '.html.gz' ) && is_readable( $log_file . '.html.gz' ) ) {
			echo file_get_contents( 'compress.zlib://' . $log_file . '.html.gz', FALSE );
		} else {
			die( __( 'Logfile not found!', 'backwpup' ) );
		}

		die();
	}

}

