// Name: Video Speed
// Description: Change the playback speed of a video file.
// Author: Strajk
import '@johnlindquist/kit';// Get the video file path, either from selection or prompt
const videoPath = await getSelectedFile() || await path({ placeholder: 'Select a video file' });

// Define available speed options with labels
const speedOptions = [
  { name: '1.5x', value: 1.5 },
  { name: '2x', value: 2 },
  { name: '3x', value: 3 },
  { name: '5x', value: 5 },
  { name: 'Custom', value: 'custom' },
];

// Prompt user to select a speed
const selectedSpeed = await arg('Select speed', speedOptions.map(option => option.name));

let speed: number;
if (selectedSpeed === 'Custom') {
  // If custom speed selected, prompt for the custom speed and validate input
    const customSpeedStr = await arg({ placeholder: 'Enter custom speed' });
    const parsedCustomSpeed = parseFloat(customSpeedStr);
    if (isNaN(parsedCustomSpeed) || parsedCustomSpeed <= 0) {
        await div('Invalid custom speed');
        exit();
    }
    speed = parsedCustomSpeed
} else {
    // Find the selected speed from predefined options
    const selectedOption = speedOptions.find(option => option.name === selectedSpeed);
    if (!selectedOption || typeof selectedOption.value === 'string') {
      await div("Invalid speed selected")
      exit()
    }
    speed = selectedOption.value
}

// Extract directory, base name, and extension from the video pathconst { dir, name, ext } = path.parse(videoPath);

// Construct the output path with '-speed' suffix
const outputPath = path.join(dir, `${name}-speed${ext}`);

// Execute ffmpeg command to change video speed and audio tempo
try {
  await term(
    `ffmpeg -i "${videoPath}" -filter:v "setpts=${
      1 / speed
    }*PTS" -filter:a "atempo=${speed}" "${outputPath}"`
  );
} catch (error) {
  console.error("FFmpeg command failed:", error);
  await div("Error processing video");
  exit();
}

// Reveal output file in the system's file explorer
await revealFile(outputPath);