// convert.js

const fs = require("fs");
const path = require("path");
const { spawn, execSync } = require("child_process");

// Ensure output folder exists
if (!fs.existsSync("output")) fs.mkdirSync("output");

// Step 1: Search for files
const inputDir = "inputs";
const files = fs.readdirSync(inputDir);

const audioFile = files.find(f => f.toLowerCase().endsWith(".wav"));
const imageFile = files.find(f => f.toLowerCase().match(/\.(jpg|jpeg|svg|png)$/));

if (!audioFile || !imageFile) {
  console.error("❌ Missing .wav and/or .jpg/.svg file in inputs/");
  process.exit(1);
}

const audioPath = path.join(inputDir, audioFile);
const imagePath = path.join(inputDir, imageFile);
const outputName = `output-${Date.now() + Math.random() * 1000}.mp4`;
const outputPath = path.join("output", outputName);

// Step 2: Get audio duration
let durationSec = 0;
try {
  const durationStr = execSync(
    `ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "${audioPath}"`
  ).toString().trim();
  durationSec = parseFloat(durationStr);
  console.log(`🎧 Audio duration: ${durationSec.toFixed(2)} sec`);
} catch (err) {
  console.error("❌ Could not determine audio duration");
  process.exit(1);
}

// Step 3: Convert using ffmpeg
const args = [
  "-loop", "1",
  "-i", imagePath,
  "-i", audioPath,
  "-c:v", "libx264",
  "-preset", "ultrafast",
  "-tune", "stillimage",
  "-crf", "23",
  "-c:a", "aac",
  "-shortest",
  "-pix_fmt", "yuv420p",
  "-movflags", "+faststart",
  outputPath
];

console.log(`🚀 Starting conversion: ${path.basename(imageFile)} + ${path.basename(audioFile)} → ${outputName}`);
const ffmpeg = spawn("ffmpeg", args);

ffmpeg.stderr.on("data", (data) => {
  const line = data.toString().trim();
  const timeMatch = line.match(/time=(\d+):(\d+):([\d.]+)/);

  if (timeMatch) {
    const [, h, m, s] = timeMatch;
    const timeSec = parseInt(h) * 3600 + parseInt(m) * 60 + parseFloat(s);
    const percent = Math.min(100, ((timeSec / durationSec) * 100).toFixed(1));
    console.log(`${line} | 📊 ${percent}%`);
  } else {
    console.log(line);
  }
});

ffmpeg.on("exit", (code) => {
  if (code !== 0) {
    console.error(`❌ FFmpeg exited with code ${code}`);
    return;
  }

  console.log(`✅ Conversion complete! Saved to: ${outputPath}`);
});