const fs = require("node:fs");
const path = require("node:path");
const shared = require("./shared.js");
let logFile;

let dir = 'log/';

if (!fs.existsSync(dir)) {
  fs.mkdirSync(dir);
}
logFile = path.join(__dirname + '/' + dir, "NetBird-UptimeKuma.log");

console.log(`[${shared.now()}] File di log situato in ${logFile}`);

if ("MAX_LOG_SIZE" in process.env) {
  shared.setMaxLogSize(process.env.MAX_LOG_SIZE);
}
console.log(`[${shared.now()}] Dimensione massima del file di log: ${shared.getMaxLogSize()} MB`);

function writeToLog(message) {
  fs.appendFileSync(logFile, `${message}\n`);
}

function Log(message) {
  console.log(message);
  keepLogfileSmall();
  writeToLog(message);
}

function keepLogfileSmall() {
  let stats = fs.statSync(logFile);
  let currentLogSize = stats.size / (1024 * 1024);

  if (currentLogSize >= shared.getMaxLogSize()) {
    try {
      const data = fs.readFileSync(logFile, 'utf8');

      let lastWorkingTokenIndex = data.lastIndexOf("Nuovo token creato");
      if (lastWorkingTokenIndex == -1) {
        try {
          fs.writeFileSync(logFile, "");
          Log(`[${shared.now()}] Log precedente cancellato correttamente.`)
        } catch (err) {
          Log(`[${shared.now()}] Errore nella scrittura del file: ${err}`);

        }
      } else {
        let lastWorkingTokenLine = data.substring(lastWorkingTokenIndex - 22, lastWorkingTokenIndex + 60) + "\n";

        try {
          fs.writeFileSync(logFile, lastWorkingTokenLine);
          Log(`[${shared.now()}] Log precedente cancellato correttamente.`)
        } catch (err) {
          Log(`[${shared.now()}] Errore nella scrittura del file: ${err}`);
        }
      }
    } catch (err) {
      Log(`[${shared.now()}] Errore nella lettura del file: ${err}`);
    }

  }
}
module.exports = { Log };