<?php

/**
 * Class for BackWPup logs display page.
 */
class BackWPup_Page_Logs extends WP_List_Table {

	/**
	 * Log Folder.
	 *
	 * @var string The log folder
	 */
	public $log_folder = '';

	/**
	 * BackWPup_Page_Logs.
	 *
	 * @var \BackWPup_Page_Logs The instance
	 */
	private static $listtable;

	/**
	 * Job Types.
	 *
	 * @var array A list of job types
	 */
	private $job_types;

	/**
	 * BackWPup_Page_Logs constructor.
	 */
	public function __construct() {
		parent::__construct(
			[
				'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 );
	}

	/**
	 * Retrieves the table classes for the job page.
	 *
	 * This method constructs an array of CSS classes to be applied to the table
	 * on the job page. The 'fixed' class is intentionally omitted from the default
	 * classes.
	 *
	 * @return array An array of CSS classes for the table.
	 */
	protected function get_table_classes() {
		// Remove 'fixed' from the default classes.
		$classes = [ 'widefat', 'striped', $this->_args['plural'] ];
		return $classes;
	}

	/**
	 * User can.
	 *
	 * @return bool True if user has the right capabilities, false otherwise
	 */
	public function ajax_user_can() {
		return current_user_can( 'backwpup_logs' );
	}

	/**
	 * Prepare Items.
	 */
	public 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 = [];

		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->getMTime() ] = $file->getFilename();
				}
			}
		}

		// Ordering.
		$order = filter_input( INPUT_GET, 'order', FILTER_SANITIZE_FULL_SPECIAL_CHARS );
		$order = $order ? sanitize_key( $order ) : 'desc';
		$order = in_array( $order, [ 'asc', 'desc' ], true ) ? $order : 'desc';

		$orderby = filter_input( INPUT_GET, 'orderby', FILTER_SANITIZE_FULL_SPECIAL_CHARS );
		$orderby = $orderby ? sanitize_key( $orderby ) : 'time';
		$orderby = in_array( $orderby, [ 'time' ], true ) ? $orderby : 'time';

		if ( 'time' === $orderby ) {
			if ( 'asc' === $order ) {
				ksort( $logfiles );
			} else {
				krsort( $logfiles );
			}
		}

		// By page.
		$start = intval( ( $this->get_pagenum() - 1 ) * $per_page );
		$end   = $start + $per_page;
		if ( $end > count( $logfiles ) ) {
			$end = count( $logfiles );
		}

		$this->items = [];
		$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(
			[
				'total_items' => count( $logfiles ),
				'per_page'    => $per_page,
				'orderby'     => $orderby,
				'order'       => $order,
			]
			);
	}

	/**
	 * {@inheritdoc}
	 */
	public function get_sortable_columns() {
		return [
			'time' => [ 'time', false ],
		];
	}

	/**
	 * {@inheritdoc}
	 */
	public function no_items() {
		esc_html_e( 'No Logs.', 'backwpup' );
	}

	/**
	 * {@inheritdoc}
	 */
	public function get_bulk_actions() {
		if ( ! $this->has_items() ) {
			return [];
		}

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

		return $actions;
	}

	/**
	 * {@inheritdoc}
	 */
	public function get_columns() {
		$posts_columns            = [];
		$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;
	}

	/**
	 * Render the bulk actions checkbox.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_cb( $item ) {
		return '<input type="checkbox" name="logfiles[]" value="' . esc_attr( $item['file'] ) . '" />';
	}

	/**
	 * The time column.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_time( $item ) {
		return sprintf(
			// translators: %1$s: date, %2$s: time.
			esc_html__( '%1$s at %2$s', 'backwpup' ),
			esc_html( wp_date( get_option( 'date_format' ), $item['logtime'] ) ),
			esc_html( wp_date( get_option( 'time_format' ), $item['logtime'] ) )
		);
	}

	/**
	 * The type column.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_type( $item ) {
		$r     = '';
		$types = explode( '+', (string) $item['type'] );
		if ( ! empty( $types ) ) {
			foreach ( $types as $type ) {
				if ( isset( $this->job_types[ $type ] ) ) {
					$r .= esc_html( $this->job_types[ $type ]->info['name'] ) . '<br />';
				} else {
					$r .= esc_html( $type ) . '<br />';
				}
			}
		}

		return $r;
	}

	/**
	 * The job column.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_job( $item ) {
		$log_name = str_replace( [ '.html', '.gz' ], '', basename( (string) $item['file'] ) );
		$view_url = 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';
		// translators: %d: job ID.
		$job_id_label    = sprintf( __( 'Job ID: %d', 'backwpup' ), absint( $item['jobid'] ) );
		$title           = esc_attr( $item['file'] . "\n" . $job_id_label );
		$r               = '<strong><a class="thickbox" href="' . esc_url( $view_url ) . '" title="' . $title . '">' . esc_html( ! empty( $item['name'] ) ? $item['name'] : $item['file'] ) . '</a></strong>';
		$actions         = [];
		$actions['view'] = '<a class="thickbox" href="' . esc_url( $view_url ) . '" title="' . esc_attr( $item['file'] ) . '">' . esc_html__( 'View', 'backwpup' ) . '</a>';
		if ( current_user_can( 'backwpup_logs_delete' ) ) {
			$actions['delete'] = '<a class="submitdelete" href="' . esc_url( 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();">' . esc_html__( 'Delete', 'backwpup' ) . '</a>';
		}
		$actions['download'] = '<a href="' . esc_url( wp_nonce_url( network_admin_url( 'admin.php' ) . '?page=backwpuplogs&action=download&file=' . $item['file'], 'download_backwpup_logs', 'download_backwpup_logs' ) ) . '">' . esc_html__( 'Download', 'backwpup' ) . '</a>';
		$r                  .= $this->row_actions( $actions );

		return $r;
	}

	/**
	 * The status column.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_status( $item ) {
		$r = '';
		if ( $item['errors'] ) {
			$errors_text = sprintf(
				// translators: %d: number of errors.
				_n( '%d ERROR', '%d ERRORS', $item['errors'], 'backwpup' ),
				absint( $item['errors'] )
			);
			$r .= sprintf(
				'<span style="color:red;font-weight:bold;">%s</span><br />',
				esc_html( $errors_text )
			);
		}
		if ( $item['warnings'] ) {
			$warnings_text = sprintf(
				// translators: %d: number of warnings.
				_n( '%d WARNING', '%d WARNINGS', $item['warnings'], 'backwpup' ),
				absint( $item['warnings'] )
			);
			$r .= sprintf(
				'<span style="color:#e66f00;font-weight:bold;">%s</span><br />',
				esc_html( $warnings_text )
			);
		}
		if ( ! $item['errors'] && ! $item['warnings'] ) {
			$r .= '<span style="color:green;font-weight:bold;">' . esc_html__( 'O.K.', 'backwpup' ) . '</span>';
		}

		return $r;
	}

	/**
	 * The size column.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_size( $item ) {
		if ( ! empty( $item['backupfilesize'] ) ) {
			return esc_html( size_format( $item['backupfilesize'], 2 ) );
		}

		return esc_html__( 'Log only', 'backwpup' );
	}

	/**
	 * The runtime column.
	 *
	 * @param array $item Item data.
	 *
	 * @return string
	 */
	public function column_runtime( $item ) {
		return absint( $item['runtime'] ) . ' ' . esc_html__( 'seconds', 'backwpup' );
	}

	/**
	 * Load.
	 */
	public static function load() {
		global $current_user;

		// Create table.
		self::$listtable = new BackWPup_Page_Logs();

		switch ( self::$listtable->current_action() ) {
			// Delete log.
			case 'delete':
				if ( ! current_user_can( 'backwpup_logs_delete' ) ) {
					break;
				}
				if ( isset( $_GET['logfiles'] ) && is_array( $_GET['logfiles'] ) ) {
					check_admin_referer( 'bulk-logs' );

					// Unslash and sanitize input.
					$logfiles = array_map( 'sanitize_text_field', wp_unslash( $_GET['logfiles'] ) );

					foreach ( $logfiles as $logfile ) {
						$logfile   = basename( (string) $logfile );
						$file_path = self::$listtable->log_folder . '/' . $logfile;

						$is_writable = wp_is_writable( $file_path );

						if ( $is_writable && ! is_dir( $file_path ) && ! is_link( $file_path ) ) {
							wp_delete_file( $file_path );
						}
					}
				}
				break;
			// Download log.
			case 'download':
				check_admin_referer( 'download_backwpup_logs', 'download_backwpup_logs' );

				$file = filter_input( INPUT_GET, 'file', FILTER_SANITIZE_FULL_SPECIAL_CHARS );
				if ( empty( $file ) ) {
					break;
				}

				$log_file = trailingslashit( self::$listtable->log_folder ) . basename( trim( (string) $file ) );
				$log_file = realpath( BackWPup_Sanitize_Path::sanitize_path( $log_file ) );

				if ( ! $log_file
					|| ! is_readable( $log_file )
					|| is_dir( $log_file )
					|| is_link( $log_file )
				) {
					header( 'HTTP/1.0 404 Not Found' );

					exit();
				}

				$capability = 'backwpup_logs';

				$download_handler = new BackWpup_Download_Handler(
					new BackWPup_Download_File(
						$log_file,
						function ( BackWPup_Download_File_Interface $obj ) {
							$obj->clean_ob()
								->headers();

                            // phpcs:ignore
                            echo backwpup_wpfilesystem()->get_contents($obj->filepath());

							exit();
						},
						$capability
					),
					'download_backwpup_logs',
					$capability,
					'download'
				);

				$download_handler->handle();
				break;
		}

		// Save per page.
		$screen_options_apply = filter_input( INPUT_POST, 'screen-options-apply', FILTER_SANITIZE_FULL_SPECIAL_CHARS );
		$screen_options       = filter_input( INPUT_POST, 'wp_screen_options', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY );
		if ( ! empty( $screen_options_apply ) && is_array( $screen_options ) ) {
			$screen_options = wp_unslash( $screen_options );
			$option         = isset( $screen_options['option'] ) ? sanitize_text_field( $screen_options['option'] ) : '';
			$value          = isset( $screen_options['value'] ) ? absint( $screen_options['value'] ) : 0;

			if ( 'backwpuplogs_per_page' === $option ) {
				check_admin_referer( 'screen-options-nonce', 'screenoptionnonce' );

				if ( $value > 0 && $value < 1000 ) {
					update_user_option( $current_user->ID, 'backwpuplogs_per_page', $value );
					wp_safe_redirect( remove_query_arg( [ 'pagenum', 'apage', 'paged' ], wp_get_referer() ) );

					exit;
				}
			}
		}

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

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

	/**
	 * Output css.
	 */
	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.
	 */
	public static function admin_print_scripts() {
		wp_enqueue_script( 'backwpupgeneral', '', [], BackWPup::get_plugin_data( 'Version' ), true );
	}

	/**
	 * Display the page content.
	 */
	public static function page() {
		?>
		<div class="wrap" id="backwpup-page">
			<h1>
			<?php
			echo esc_html(
				sprintf(
				/* translators: %s: plugin name. */
				__( '%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() {
		$log = filter_input( INPUT_GET, 'log', FILTER_SANITIZE_FULL_SPECIAL_CHARS );
		$log = $log ? sanitize_file_name( $log ) : '';

		if ( ! current_user_can( 'backwpup_logs' ) || '' === $log || false === strpos( $log, 'backwpup_log_' ) ) {
			exit( '-1' );
		}

		check_ajax_referer( 'view-log_' . $log );

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

		$filesystem   = backwpup_wpfilesystem();
		$allowed_html = [
			'html'  => [
				'lang' => true,
			],
			'head'  => [],
			'meta'  => [
				'charset'    => true,
				'name'       => true,
				'content'    => true,
				'http-equiv' => true,
			],
			'title' => [],
			'body'  => [
				'style' => true,
			],
			'span'  => [
				'style'    => true,
				'datetime' => true,
				'title'    => true,
			],
			'br'    => [],
		];

		if ( file_exists( $log_file . '.html' ) && is_readable( $log_file . '.html' ) ) {
			echo wp_kses( $filesystem->get_contents( $log_file . '.html' ), $allowed_html );
		} elseif ( file_exists( $log_file . '.html.gz' ) && is_readable( $log_file . '.html.gz' ) ) {
			echo wp_kses( $filesystem->get_contents( 'compress.zlib://' . $log_file . '.html.gz' ), $allowed_html );
		} else {
			exit( esc_html__( 'Logfile not found!', 'backwpup' ) );
		}

		exit();
	}
}
