// Name: Trim Video Head/Tail
// Description: Select a video file and export a new one with the first 9s and last 5s removed.
// Author: thoncs
// GitHub: thoncs
import "@johnlindquist/kit"

const HEAD_TRIM = 9
const TAIL_TRIM = 5

// Ensure ffmpeg/ffprobe are available
if (!which("ffmpeg") || !which("ffprobe")) {
  await div(md(`# Missing ffmpeg/ffprobe
Please install ffmpeg (which includes ffprobe) and try again.
- macOS: brew install ffmpeg
- Windows: winget install Gyan.FFmpeg or choco install ffmpeg
- Linux: sudo apt-get install ffmpeg
`))
  exit(1)
}

// Pick input video (use Finder selection if available)
let sel = await getSelectedFile()
let inputPath = ""
if (sel) {
  inputPath = sel.split("\n").filter(Boolean)[0]
} else {
  inputPath = await selectFile("Select a video file to trim")
}

if (!inputPath) exit(1)

try {
  // Get duration in seconds (float)
  const probe = await $`ffprobe -v error -show_entries format=duration -of default=nokey=1:noprint_wrappers=1 ${inputPath}`
  const total = parseFloat(probe.stdout.trim())
  const newDuration = total - (HEAD_TRIM + TAIL_TRIM)

  if (!isFinite(newDuration) || newDuration <= 0) {
    await div(md(`Total duration (${total.toFixed(2)}s) is too short to remove ${HEAD_TRIM + TAIL_TRIM}s.`))
    exit(1)
  }

  const ext = path.extname(inputPath)
  const base = path.basename(inputPath, ext)
  const dir = path.dirname(inputPath)
  const outName = `${base}-trimmed-${Math.floor(Date.now() / 1000)}${ext}`
  const outputPath = path.join(dir, outName)

  // Perform trim: seek 9s from start, keep newDuration, stream copy
  await div({
    html: md(`## Trimming Video
- Input: ${path.basename(inputPath)}
- Start at: ${HEAD_TRIM}s
- Output duration: ${newDuration.toFixed(2)}s
- Output: ${outName}
`),
    onInit: async () => {
      await $`ffmpeg -y -ss ${HEAD_TRIM} -i ${inputPath} -t ${newDuration} -c copy ${outputPath}`
      submit("done")
    },
  })

  await revealFile(outputPath)
} catch (err) {
  await div(md(`Error:\n\`\`\`\n${String(err)}\n\`\`\``))
  exit(1)
}