<?php

if ( ! class_exists( 'blcLogger' ) ) :

	define( 'BLC_LEVEL_DEBUG', 0 );
	define( 'BLC_LEVEL_INFO', 1 );
	define( 'BLC_LEVEL_WARNING', 2 );
	define( 'BLC_LEVEL_ERROR', 3 );

	/**
	 * Base class for loggers. Doesn't actually log anything anywhere.
	 *
	 * @package Broken Link Checker
	 * @author Janis Elsts
	 */
	class blcLogger {
		protected $log_level = BLC_LEVEL_DEBUG;

		function __construct( $param = '' ) {

		}

		function blcLogger( $param = '' ) {
			$this->__construct( $param );
		}

		function log( $message, $object = null, $level = BLC_LEVEL_INFO ) {

		}

		function debug( $message, $object = null ) {
			$this->log( $message, $object, BLC_LEVEL_DEBUG );
		}

		function info( $message, $object = null ) {
			$this->log( $message, $object, BLC_LEVEL_INFO );
		}

		function warn( $message, $object = null ) {
			$this->log( $message, $object, BLC_LEVEL_WARNING );
		}

		function error( $message, $object = null ) {
			$this->log( $message, $object, BLC_LEVEL_ERROR );
		}

		function get_messages( $min_level = BLC_LEVEL_DEBUG ) {
			return array();
		}

		function get_log( $min_level = BLC_LEVEL_DEBUG ) {
			return array();
		}

		function clear() {

		}

		public function set_log_level( $level ) {
			$this->log_level = $level;
		}
	}

	/**
	 * A basic logger that uses WP options for permanent storage.
	 *
	 * Log entries are initially stored in memory and need to explicitly
	 * flushed to the database by calling blcCachedOptionLogger::save().
	 *
	 * @package Broken Link Checker
	 * @author Janis Elsts
	 */
	class blcCachedOptionLogger extends blcLogger {
		var $option_name = '';
		var $log;
		var $filter_level = BLC_LEVEL_DEBUG;

		function __construct( $option_name = '' ) {
			$this->option_name = $option_name;
			$oldLog            = get_option( $this->option_name );
			if ( is_array( $oldLog ) && ! empty( $oldLog ) ) {
				$this->log = $oldLog;
			} else {
				$this->log = array();
			}
		}

		function log( $message, $object = null, $level = BLC_LEVEL_DEBUG ) {
			$new_entry = array( $level, $message, $object );
			array_push( $this->log, $new_entry );
		}

		function get_log( $min_level = BLC_LEVEL_DEBUG ) {
			$this->filter_level = $min_level;
			return array_filter( $this->log, array( $this, '_filter_log' ) );
		}

		function _filter_log( $entry ) {
			return ( $entry[0] >= $this->filter_level );
		}

		function get_messages( $min_level = BLC_LEVEL_DEBUG ) {
			$messages = $this->get_log( $min_level );
			return array_map( array( $this, '_get_log_message' ), $messages );
		}

		function _get_log_message( $entry ) {
			return $entry[1];
		}

		function clear() {
			$this->log = array();
			delete_option( $this->option_name );
		}

		function save() {
			update_option( $this->option_name, $this->log );
		}
	}

	/**
	 * A dummy logger that doesn't log anything.
	 */
	class blcDummyLogger extends blcLogger { }

	/**
	 * A basic logger that logs messages to a file.
	 */
	class blcFileLogger extends blcLogger {
		protected $fileName; //phpcs:ignore WordPress.NamingConventions.ValidVariableName.PropertyNotSnakeCase

		public function __construct( $fileName = '' ) {
			$this->fileName = $fileName;
		}

		function log( $message, $object = null, $level = BLC_LEVEL_INFO ) {
			if ( $level < $this->log_level ) {
				return;
			}

			$line = sprintf(
				'[%1$s] %2$s %3$s',
				date( 'Y-m-d H:i:s P' ), //phpcs:ignore WordPress.DateTime.RestrictedFunctions.date_date
				$this->get_level_string( $level ),
				$message
			);

			if ( isset( $object ) ) {
				$line .= ' ' . var_export( $object, true );
			}

			$line .= "\n";

			error_log( $line, 3, $this->fileName );
		}

		function get_messages( $min_level = BLC_LEVEL_DEBUG ) {
			return array( __CLASS__ . ':get_messages() is not implemented' );
		}

		function get_log( $min_level = BLC_LEVEL_DEBUG ) {
			return array( __CLASS__ . ':get_log() is not implemented' );
		}

		public function clear() {
			if ( is_file( $this->fileName ) && is_writable( $this->fileName ) ) {
				$handle = fopen( $this->fileName, 'w' );
				fclose( $handle );
			}
		}

		protected function get_level_string( $level ) {
			switch ( $level ) {
				case BLC_LEVEL_DEBUG:
					return 'DEBUG:';
				case BLC_LEVEL_ERROR:
					return 'ERROR:';
				case BLC_LEVEL_WARNING:
					return 'WARN:';
				case BLC_LEVEL_INFO:
					return 'INFO:';
			}
			return 'LOG:';
		}
	}

endif;