<?php
/**
 * The plugin logging class.
 */
namespace LiteSpeed;

defined( 'WPINC' ) || exit;

class Debug2 extends Instance {
	protected static $_instance;
	private static $log_path;
	private static $_prefix;

	const TYPE_CLEAR_LOG = 'clear_log';
	const TYPE_BETA_TEST = 'beta_test';

	const BETA_TEST_URL = 'beta_test_url';

	const BETA_TEST_URL_WP = 'https://downloads.wordpress.org/plugin/litespeed-cache.zip';

	/**
	 * Log class Confructor
	 *
	 * NOTE: in this process, until last step ( define const LSCWP_LOG = true ), any usage to WP filter will not be logged to prevent infinite loop with log_filters()
	 *
	 * @since 1.1.2
	 * @access public
	 */
	protected function __construct() {
		self::$log_path = LSCWP_CONTENT_DIR . '/debug.log';
		if ( ! empty( $_SERVER[ 'HTTP_USER_AGENT' ] ) && strpos( $_SERVER[ 'HTTP_USER_AGENT' ], Crawler::FAST_USER_AGENT ) === 0 ) {
			self::$log_path = LSCWP_CONTENT_DIR . '/crawler.log';
		}

		! defined( 'LSCWP_LOG_TAG' ) && define( 'LSCWP_LOG_TAG', get_current_blog_id() );

		if ( Conf::val( Base::O_DEBUG_LEVEL ) ) {
			! defined( 'LSCWP_LOG_MORE' ) && define( 'LSCWP_LOG_MORE', true );
		}

	}

	/**
	 * Beta test upgrade
	 *
	 * @since 2.9.5
	 * @access public
	 */
	public function beta_test( $zip = false ) {
		if ( ! $zip ) {
			if ( empty( $_REQUEST[ self::BETA_TEST_URL ] ) ) {
				return;
			}

			$zip = $_REQUEST[ self::BETA_TEST_URL ];
			if ( $zip !== Debug2::BETA_TEST_URL_WP ) {
				if ( $zip === 'latest' ) {
					$zip = Debug2::BETA_TEST_URL_WP;
				}
				else {
					// Generate zip url
					$zip = $this->_package_zip( $zip );
				}
			}
		}

		if ( ! $zip ) {
			Debug2::debug( '[Debug2] ❌  No ZIP file' );
			return;
		}

		Debug2::debug( '[Debug2] ZIP file ' . $zip );

		$update_plugins = get_site_transient( 'update_plugins' );
		if ( ! is_object( $update_plugins ) ) {
			$update_plugins = new \stdClass();
		}

		$plugin_info = new \stdClass();
		$plugin_info->new_version = Core::VER;
		$plugin_info->slug = Core::PLUGIN_NAME;
		$plugin_info->plugin = Core::PLUGIN_FILE;
		$plugin_info->package = $zip;
		$plugin_info->url = 'https://wordpress.org/plugins/litespeed-cache/';

		$update_plugins->response[ Core::PLUGIN_FILE ] = $plugin_info;

		set_site_transient( 'update_plugins', $update_plugins );

		// Run upgrade
		Activation::get_instance()->upgrade();
	}

	/**
	 * Git package refresh
	 *
	 * @since  2.9.5
	 * @access private
	 */
	private function _package_zip( $commit ) {
		$data = array(
			'commit'	=> $commit,
		);
		$res = Cloud::get( Cloud::API_BETA_TEST, $data );

		if ( empty( $res[ 'zip' ] ) ) {
			return false;
		}

		return $res[ 'zip' ];
	}

	/**
	 * Log Purge headers separately
	 *
	 * @since 2.7
	 * @access public
	 */
	public static function log_purge( $purge_header ) {
		// Check if debug is ON
		if ( ! defined( 'LSCWP_LOG' ) && ! defined( 'LSCWP_LOG_BYPASS_NOTADMIN' ) ) {
			return;
		}

		$purge_file = LSCWP_CONTENT_DIR . '/debug.purge.log';

		self::get_instance()->_init_request( $purge_file );

		$msg = $purge_header . self::_backtrace_info( 6 );

		File::append( $purge_file, self::format_message( $msg ) );

	}

	/**
	 * Enable debug log
	 *
	 * @since 1.1.0
	 * @access public
	 */
	public static function init() {
		$debug = Conf::val( Base::O_DEBUG );
		if ( $debug == Base::VAL_ON2 ) {
			if ( ! Router::is_admin_ip() ) {
				define( 'LSCWP_LOG_BYPASS_NOTADMIN', true );
				return;
			}
		}

		/**
		 * Check if hit URI includes/excludes
		 * This is after LSCWP_LOG_BYPASS_NOTADMIN to make `log_purge()` still work
		 * @since  3.0
		 */
		$list = Conf::val( Base::O_DEBUG_INC );
		if ( $list ) {
			$result = Utility::str_hit_array( $_SERVER[ 'REQUEST_URI' ], $list );
			if ( ! $result ) {
				return;
			}
		}

		$list = Conf::val( Base::O_DEBUG_EXC );
		if ( $list ) {
			$result = Utility::str_hit_array( $_SERVER[ 'REQUEST_URI' ], $list );
			if ( $result ) {
				return;
			}
		}

		if ( ! defined( 'LSCWP_LOG' ) ) {// If not initialized, do it now
			self::get_instance()->_init_request();
			define( 'LSCWP_LOG', true );

		}
	}

	/**
	 * Create the initial log messages with the request parameters.
	 *
	 * @since 1.0.12
	 * @access private
	 */
	private function _init_request( $log_file = null ) {
		if ( ! $log_file ) {
			$log_file = self::$log_path;
		}

		// Check log file size
		$log_file_size = Conf::val( Base::O_DEBUG_FILESIZE );
		if ( file_exists( $log_file ) && filesize( $log_file ) > $log_file_size * 1000000 ) {
			File::save( $log_file, '' );
		}

		// For more than 2s's requests, add more break
		if ( file_exists( $log_file ) && time() - filemtime( $log_file ) > 2 ) {
			File::append( $log_file, "\n\n\n\n" );
		}

		if ( PHP_SAPI == 'cli' ) {
			return;
		}

		$servervars = array(
			'Query String' => '',
			'HTTP_ACCEPT' => '',
			'HTTP_USER_AGENT' => '',
			'HTTP_ACCEPT_ENCODING' => '',
			'HTTP_COOKIE' => '',
			'X-LSCACHE' => '',
			'LSCACHE_VARY_COOKIE' => '',
			'LSCACHE_VARY_VALUE' => '',
			'ESI_CONTENT_TYPE' => '',
		);
		$server = array_merge( $servervars, $_SERVER );
		$params = array();

		if ( isset( $_SERVER[ 'HTTPS' ] ) && $_SERVER[ 'HTTPS' ] == 'on' ) {
			$server['SERVER_PROTOCOL'] .= ' (HTTPS) ';
		}

		$param = sprintf( '💓 ------%s %s %s', $server['REQUEST_METHOD'], $server['SERVER_PROTOCOL'], strtok( $server['REQUEST_URI'], '?' ) );

		$qs = ! empty( $server['QUERY_STRING'] ) ? $server['QUERY_STRING'] : '';
		if ( Conf::val( Base::O_DEBUG_COLLAPS_QS ) ) {
			if ( strlen( $qs ) > 53 ) {
				$qs = substr( $qs, 0, 53 ) . '...';
			}
			if ( $qs ) {
				$param .= ' ? ' . $qs;
			}
			$params[] = $param;
		}
		else {
			$params[] = $param;
			$params[] = 'Query String: ' . $qs;
		}

		if ( ! empty( $_SERVER[ 'HTTP_REFERER' ] ) ) {
			$params[] = 'HTTP_REFERER: ' . $server[ 'HTTP_REFERER' ];
		}

		if ( defined( 'LSCWP_LOG_MORE' ) ) {
			$params[] = 'User Agent: ' . $server[ 'HTTP_USER_AGENT' ];
			$params[] = 'Accept: ' . $server['HTTP_ACCEPT'];
			$params[] = 'Accept Encoding: ' . $server['HTTP_ACCEPT_ENCODING'];
		}
		if ( Conf::val( Base::O_DEBUG_COOKIE ) ) {
			$params[] = 'Cookie: ' . $server['HTTP_COOKIE'];
		}
		if ( isset( $_COOKIE[ '_lscache_vary' ] ) ) {
			$params[] = 'Cookie _lscache_vary: ' . $_COOKIE[ '_lscache_vary' ];
		}
		if ( defined( 'LSCWP_LOG_MORE' ) ) {
			$params[] = 'X-LSCACHE: ' . ( ! empty( $server[ 'X-LSCACHE' ] ) ? 'true' : 'false' );
		}
		if( $server['LSCACHE_VARY_COOKIE'] ) {
			$params[] = 'LSCACHE_VARY_COOKIE: ' . $server['LSCACHE_VARY_COOKIE'];
		}
		if( $server['LSCACHE_VARY_VALUE'] ) {
			$params[] = 'LSCACHE_VARY_VALUE: ' . $server['LSCACHE_VARY_VALUE'];
		}
		if( $server['ESI_CONTENT_TYPE'] ) {
			$params[] = 'ESI_CONTENT_TYPE: ' . $server['ESI_CONTENT_TYPE'];
		}

		$request = array_map( __CLASS__ . '::format_message', $params );

		File::append( $log_file, $request );
	}

	/**
	 * Formats the log message with a consistent prefix.
	 *
	 * @since 1.0.12
	 * @access private
	 * @param string $msg The log message to write.
	 * @return string The formatted log message.
	 */
	private static function format_message( $msg ) {
		// If call here without calling get_enabled() first, improve compatibility
		if ( ! defined( 'LSCWP_LOG_TAG' ) ) {
			return $msg . "\n";
		}

		if ( ! isset( self::$_prefix ) ) {
			// address
			if ( PHP_SAPI == 'cli' ) {
				$addr = '=CLI=';
				if ( isset( $_SERVER[ 'USER' ] ) ) {
					$addr .= $_SERVER[ 'USER' ];
				}
				elseif ( $_SERVER[ 'HTTP_X_FORWARDED_FOR' ] ) {
					$addr .= $_SERVER[ 'HTTP_X_FORWARDED_FOR' ];
				}
			}
			else {
				$addr = $_SERVER[ 'REMOTE_ADDR' ] . ':' . $_SERVER[ 'REMOTE_PORT' ];
			}

			// Generate a unique string per request
			self::$_prefix = sprintf( " [%s %s %s] ", $addr, LSCWP_LOG_TAG, Str::rrand( 3 ) );
		}
		list( $usec, $sec ) = explode(' ', microtime() );
		return date( 'm/d/y H:i:s', $sec + LITESPEED_TIME_OFFSET ) . substr( $usec, 1, 4 ) . self::$_prefix . $msg . "\n";
	}

	/**
	 * Direct call to log a debug message.
	 *
	 * @since 1.1.3
	 * @access public
	 */
	public static function debug( $msg, $backtrace_limit = false ) {
		if ( ! defined( 'LSCWP_LOG' ) ) {
			return;
		}

		if ( $backtrace_limit !== false ) {
			if ( ! is_numeric( $backtrace_limit ) ) {
				$backtrace_limit = self::trim_longtext( $backtrace_limit );
				$msg .= ' --- ' . var_export( $backtrace_limit, true );
				self::push( $msg );
				return;
			}

			self::push( $msg, $backtrace_limit + 1 );
			return;
		}

		self::push( $msg );
	}

	/**
	 * Trim long string before array dump
	 * @since  3.3
	 */
	public static function trim_longtext( $backtrace_limit ) {
		if ( is_array( $backtrace_limit ) ) {
			$backtrace_limit = array_map( __CLASS__ . '::trim_longtext', $backtrace_limit );
		}
		if ( is_string( $backtrace_limit ) && strlen( $backtrace_limit ) > 500 ) {
			$backtrace_limit = substr( $backtrace_limit, 0, 1000 ) . '...';
		}
		return $backtrace_limit;
	}

	/**
	 * Direct call to log an advanced debug message.
	 *
	 * @since 1.2.0
	 * @access public
	 */
	public static function debug2( $msg, $backtrace_limit = false ) {
		if ( ! defined( 'LSCWP_LOG_MORE' ) ) {
			return;
		}
		self::debug( $msg, $backtrace_limit );
	}

	/**
	 * Logs a debug message.
	 *
	 * @since 1.1.0
	 * @access private
	 * @param string $msg The debug message.
	 * @param int $backtrace_limit Backtrace depth.
	 */
	private static function push( $msg, $backtrace_limit = false ) {
		// backtrace handler
		if ( defined( 'LSCWP_LOG_MORE' ) && $backtrace_limit !== false ) {
			$msg .= self::_backtrace_info( $backtrace_limit );
		}

		File::append( self::$log_path, self::format_message( $msg ) );
	}

	/**
	 * Backtrace info
	 *
	 * @since 2.7
	 */
	private static function _backtrace_info( $backtrace_limit ) {
		$msg = '';

		$trace = version_compare( PHP_VERSION, '5.4.0', '<' ) ? debug_backtrace() : debug_backtrace( false, $backtrace_limit + 3 );
		for ( $i=2; $i <= $backtrace_limit + 2; $i++ ) {// 0st => _backtrace_info(), 1st => push()
			if ( empty( $trace[ $i ][ 'class' ] ) ) {
				if ( empty( $trace[ $i ][ 'file' ] ) ) {
					break;
				}
				$log = "\n" . $trace[ $i ][ 'file' ];
			}
			else {
				if ( $trace[$i]['class'] == __CLASS__ ) {
					continue;
				}

				$args = '';
				if ( ! empty( $trace[ $i ][ 'args' ] ) ) {
					foreach ( $trace[ $i ][ 'args' ] as $v ) {
						if ( is_array( $v ) ) {
							$v = 'ARRAY';
						}
						if ( is_string( $v ) || is_numeric( $v ) ) {
							$args .= $v . ',';
						}
					}

					$args = substr( $args, 0, strlen( $args ) > 100 ? 100 : -1 );
				}

				$log = str_replace('Core', 'LSC', $trace[$i]['class']) . $trace[$i]['type'] . $trace[$i]['function'] . '(' . $args . ')';
			}
			if ( ! empty( $trace[$i-1]['line'] ) ) {
				$log .= '@' . $trace[$i-1]['line'];
			}
			$msg .= " => $log";
		}

		return $msg;
	}

	/**
	 * Clear log file
	 *
	 * @since 1.6.6
	 * @access private
	 */
	private function _clear_log() {
		File::save( self::$log_path, '' );
		File::save( LSCWP_CONTENT_DIR . '/debug.purge.log', '' );
	}

	/**
	 * Handle all request actions from main cls
	 *
	 * @since  1.6.6
	 * @access public
	 */
	public static function handler() {
		$instance = self::get_instance();

		$type = Router::verify_type();

		switch ( $type ) {
			case self::TYPE_CLEAR_LOG :
				$instance->_clear_log();
				break;

			case self::TYPE_BETA_TEST :
				$instance->beta_test();
				break;

			default:
				break;
		}

		Admin::redirect();
	}
}
