/*
  This file is part of Freedom Loader.

  Copyright (C) 2025 MasterAcnolo

  Freedom Loader is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License.

  Freedom Loader is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

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

const logger = require("../logger").logger;

// Path vers le .exe de YT-DLP
const ytDlpPath = path.join(__dirname, '../../yt-dlp.exe');

router.post("/", (req, res) => {
  try {
    // récupère les options envoyées depuis le frontend
    const options = {
      url: req.body.url,
      audioOnly: req.body.audioOnly === "1",
      quality: req.body.quality || "best",
    };

    if (!options.url) {
      logger.warn("Requête POST /download sans URL");
      return res.status(400).send("❌ URL manquante !");
    }

    const outputFolder = req.app.locals.outputFolder;

    if (!fs.existsSync(outputFolder)) {
      fs.mkdirSync(outputFolder, { recursive: true });
      logger.info("Dossier Freedom Loader Output créé à la volée dans Téléchargements.");
    }

    const outputTemplate = path.join(outputFolder, "%(title)s.%(ext)s");

    // tableau d'arguments yt-dlp
    const args = ["--no-continue", "--restrict-filenames"];

    if (options.audioOnly) {
      args.push("--extract-audio", "--audio-format", "mp3");
    }

    // gestion qualité
    const qualityMap = {
      best: "bestvideo+bestaudio/best",
      medium: "bestvideo[height<=720]+bestaudio/best[height<=720]",
      worst: "worstvideo+worstaudio/worst",
      1080: "bestvideo[height<=1080]+bestaudio/best[height<=1080]",
      720: "bestvideo[height<=720]+bestaudio/best[height<=720]",
      480: "bestvideo[height<=480]+bestaudio/best[height<=480]",
    };

    const format = qualityMap[options.quality] || "best";
    args.push("-f", format);

    args.push("-o", outputTemplate);
    args.push(options.url);

    logger.info(`Téléchargement demandé : url=${options.url}, audioOnly=${options.audioOnly}, quality=${options.quality}`);
    logger.info(`Commande yt-dlp : ${ytDlpPath} ${args.join(" ")}`);

    const child = execFile(ytDlpPath, args);

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

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

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

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

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

module.exports = router;