const express = require("express");
const multer = require("multer");
const { exec } = require("child_process");
const path = require("path");
const fs = require("fs");

const app = express();
const upload = multer({ dest: "uploads/" });

app.post("/convert", upload.fields([{ name: "audio" }, { name: "image" }]), (req, res) => {
  const audioPath = req.files.audio[0].path;
  const imagePath = req.files.image[0].path;
  const output = `output-${Date.now()}.mp4`;

  const cmd = `ffmpeg -loop 1 -i ${imagePath} -i ${audioPath} -c:v libx264 -preset fast -tune stillimage -crf 18 -c:a aac -shortest -pix_fmt yuv420p ${output}`;

  exec(cmd, (err) => {
    if (err) {
      console.error(err);
      res.status(500).send("Conversion failed");
    } else {
      res.download(output, () => {
        fs.unlinkSync(audioPath);
        fs.unlinkSync(imagePath);
        fs.unlinkSync(output);
      });
    }
  });
});

app.listen(3000, () => console.log("FFmpeg API running on port 3000"));