const logDir = path.resolve( __dirname, '..', 'log' );
	const layout = {
		type: 'pattern',
		pattern: '%d %p %c %f:%l %m%n'
	};

	function logFile( filename: string ) {
		return {
			type: 'dateFile',
			filename: path.resolve( logDir, filename ),
			keepFileExt: true,
			daysToKeep: 30,
			pattern: '.yyyy-MM-dd',
			encoding: 'utf-8',
			layout
		};
	}
	const log4jsConfig = {
		appenders: {
			console: {
				type: 'console',
				layout
			},
			stderr: {
				type: 'stderr',
				layout
			},
			stdout: {
				type: 'stdout',
				layout
			},
			master: logFile( 'master.log' ),
			bus: logFile( 'bus.log' ),
			command: logFile( 'command.log' ),
			query: logFile( 'query.log' ),
			process: logFile( 'process.log' ),
			errors: logFile( 'errors.log' ),
			'only-errors': {
				type: 'logLevelFilter',
				appender: 'errors',
				level: 'error'
			}
		},
		categories: {
			default: {
				appenders: [ 'console', 'master', 'only-errors' ],
				level: 'info',
				enableCallStack: true
			},
			bus: {
				appenders: [ 'bus', 'only-errors' ],
				level: 'info',
				enableCallStack: true
			},
			command: {
				appenders: [ 'command', 'only-errors' ],
				level: 'info',
				enableCallStack: true
			},
			query: {
				appenders: [ 'query', 'only-errors' ],
				level: 'info',
				enableCallStack: true
			},
			process: {
				appenders: [ 'process', 'only-errors' ],
				level: 'debug',
				enableCallStack: true
			}
		},
		disableClustering: true
	};
	log4js.configure( log4jsConfig );