// scanner/logger.js
const fs = require('fs');
const path = require('path');

const LOG_MODE = process.env.LOG_MODE || "console";   // console | file | both
const LOG_FILE = process.env.LOG_FILE || "scan.log";

let stream = null;

if (LOG_MODE === "file" || LOG_MODE === "both") {
  const logPath = path.resolve(__dirname, "..", LOG_FILE);
  stream = fs.createWriteStream(logPath, { flags: "a" });
}

function ts() {
  return new Date().toISOString().replace("T", " ").split(".")[0];
}

function log(message) {
  const line = `${ts()} ${message}\n`;

  if (LOG_MODE === "console" || LOG_MODE === "both") {
    process.stdout.write(line);
  }

  if (LOG_MODE === "file" || LOG_MODE === "both") {
    stream.write(line);
  }
}

module.exports = { log };