/*
 * Copyright 2020 Spotify AB
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import * as winston from 'winston';
import { TransformableInfo } from 'logform';

const coloredTemplate = (info: TransformableInfo) => {
  const { timestamp, level, message, plugin, service, ...fields } = info;
  const colorizer = winston.format.colorize();
  const prefix = plugin || service;
  const timestampColor = colorizer.colorize('timestamp', timestamp);
  const prefixColor = colorizer.colorize('prefix', prefix);

  const extraFields = Object.entries(fields)
    .map(([key, value]) => `${colorizer.colorize('field', `${key}`)}=${value}`)
    .join(' ');

  return `${timestampColor} ${prefixColor} ${level} ${message} ${extraFields}`;
};

export const coloredFormat = winston.format.combine(
  winston.format.timestamp(),
  winston.format.colorize({
    colors: { timestamp: 'dim', prefix: 'blue', field: 'cyan' },
  }),
  winston.format.printf(coloredTemplate),
);
