black-horse/src/services/logger-service.js

Chess engine built in Javascript using the alpha-beta algorithm

const configs = require('../configurations');
const { appendFile } = require('fs');

class LogStrategy {
	static noDate(timestamp, message) {
		console.log(message); // eslint-disable-line no-console
	}

	static toFile(timestamp, message) {
		let fileName = process.cwd() + '/logs/logs.txt';
		appendFile(fileName, `${timestamp} - ${message} \n`, error => {
			if (error) {
				console.log('Error writing to file'); // eslint-disable-line no-console
				console.error(error); // eslint-disable-line no-console
			}
		});
	}

	static toConsole(timestamp, message) {
		console.log(`${timestamp} - ${message}`); // eslint-disable-line no-console
	}

	static none() {}
}

class LoggerService {
	constructor(logLevel, logStrategy) {
		this.logLevel = logLevel;
		this.logs = [];
		this.changeStrategy(logStrategy);
	}

	changeStrategy(newStrategy) {
		if (typeof LogStrategy[newStrategy] === 'function') {
			this.stategy = LogStrategy[newStrategy];
		}

		if (!this.stategy) {
			this.stategy = LogStrategy['noDate'];
		}
	}

	log(message, logLevel = 0) {
		if (configs.loggingEnabled && configs.currentLogLevel >= logLevel) {
			const timestamp = new Date().toISOString();
			this.stategy(timestamp, message);
		}
	}
}

module.exports = new LoggerService(configs.currentLogLevel, configs.logStrategy);