/*
 Copyright 2025 Google LLC

 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

      https://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 * as path from "path";

let fileTransport: winston.transport | null = null;

const consoleTransport = new winston.transports.Console({
  level: "info", // Default to info, can be updated later
  format: winston.format.combine(
    winston.format.colorize(),
    winston.format.printf(({ timestamp, level, message }) => {
      // Clear the current line (where progress bar might be) before logging
      // \r clears the line, \x1b[K clears from cursor to end of line
      return `\r\x1b[K${timestamp} [${level}]: ${message}`;
    })
  ),
});

// Create a default logger instance that logs to console only initially
export const logger = winston.createLogger({
  level: "debug", // Allow all logs to flow through (transports can filter)
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.printf(({ timestamp, level, message }) => {
      return `${timestamp} [${level}]: ${message}`;
    })
  ),
  transports: [consoleTransport],
});

export function setupLogger(outputDir: string | undefined, logLevel: string) {
  // Ensure the global level allows debug logs so they reach the file transport
  logger.level = "debug";

  // Update Console transport level to match user preference directly
  consoleTransport.level = logLevel;

  if (fileTransport) {
    logger.remove(fileTransport);
    fileTransport = null;
  }

  if (outputDir) {
    fileTransport = new winston.transports.File({
      filename: path.join(outputDir, "output.log"),
      level: "debug", // Always capture everything in the file
      format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.json()
      ),
    });

    logger.add(fileTransport);
  }
}