const { execFile } = require("child_process");
const express = require("express");
const router = express.Router();
const path = require("path");
const fs = require("fs");

const { logger } = require("../logger");
const config = require("../../config");
const { isValidUrl, isSafePath } = require("../helpers/validation");
const { buildYtDlpArgs } = require("../helpers/buildArgs");
const { notifyDownloadFinished } = require("../helpers/notify");

const { userYtDlp } = require("../helpers/path");

router.post("/", (req, res) => {
  try {
    const options = {
      url: req.body.url,
      audioOnly: req.body.audioOnly === "1",
      quality: req.body.quality || "best",
      outputFolder: req.body.savePath || path.join(process.env.USERPROFILE, "Downloads", "Freedom Loader"),
    };

    if (!options.url || !isValidUrl(options.url)) return res.status(400).send("❌ URL invalide !");

    if (!isSafePath(options.outputFolder)) return res.status(400).send("❌ Chemin de sauvegarde non autorisé.");

    fs.mkdirSync(options.outputFolder, { recursive: true });

    const args = buildYtDlpArgs(options);
    logger.info(args)
    const child = execFile(userYtDlp, args);

    child.on("error", err => {
      logger.error(`Erreur yt-dlp : ${err.message}`);
      res.status(500).send(`❌ Erreur yt-dlp : ${err.message}`);
    });

    child.on("close", code => {
      if (code === 0) {
        notifyDownloadFinished(options.outputFolder);
        res.send("✅ Téléchargement terminé !");
      } else res.status(500).send(`❌ yt-dlp a échoué avec le code : ${code}`);
    });

    if (config.debugMode == true) {
      child.stdout.on("data", data => data.toString().split("\n").forEach(line => line.trim() && logger.info(`[yt-dlp stdout] ${line}`)));
      child.stderr.on("data", data => data.toString().split("\n").forEach(line => line.trim() && logger.error(`[yt-dlp stderr] ${line}`)));
    }

  } catch (err) {
    logger.error(`Erreur serveur dans /download : ${err.message}`);
    res.status(500).send(`Erreur serveur : ${err.message}`);
  }
});

module.exports = router;