/*
 * Copyright (c) 2017-present Paul Borza
 *
 * This software may be modified and distributed under the terms
 * of the MIT license. See the LICENSE file for details.
 */

import * as bunyan from 'bunyan';
import * as fs from 'fs';
import * as path from 'path';

export class Bunyan {
    public static getInstance() {
        const dirname = path.join(__dirname, '../../../logs/');

        // Creates the log directory if it doesn't exist.
        if (!fs.existsSync(dirname)) {
            fs.mkdirSync(dirname);
        }

        if (!Bunyan.instance) {
            const streams = [{
                count: 7,
                path: path.join(dirname, 'default.log'),
                period: '1d',
                type: 'rotating-file',
            }] as bunyan.Stream[];

            // Writes to stdout in development.
            if (typeof process.env.NODE_ENV === 'undefined' ||
                process.env.NODE_ENV === 'development') {
                    streams.push({
                        level: 'info',
                        stream: process.stdout,
                    } as bunyan.Stream);
                }

            Bunyan.instance = bunyan.createLogger({
                name: 'elf',
                streams,
            });
        }

        return Bunyan.instance;
    }

    private static instance: bunyan;
}