import { app } from 'electron'
import fs from 'node:fs'
import path from 'node:path'

export function resolveFfmpegPath(): string {
  const envPath = process.env.FFMPEG_PATH?.trim()
  if (envPath) return envPath

  const exe = process.platform === 'win32' ? 'ffmpeg.exe' : 'ffmpeg'
  const bundledPath = path.join(process.resourcesPath, 'bin', process.platform, exe)
  if (isUsableBinary(bundledPath)) return bundledPath

  return 'ffmpeg'
}

export function missingFfmpegMessage(): string {
  if (app.isPackaged) {
    return 'ffmpeg is not bundled with this RUWIO build, or it cannot be executed. Install ffmpeg or set FFMPEG_PATH to export MP4.'
  }
  return 'ffmpeg was not found. Install ffmpeg or set FFMPEG_PATH to export MP4.'
}

function isUsableBinary(file: string): boolean {
  try {
    fs.accessSync(file, process.platform === 'win32' ? fs.constants.F_OK : fs.constants.X_OK)
    return true
  } catch {
    return false
  }
}