import { NextRequest, NextResponse } from 'next/server'
import { validateUploadSecret } from '@/lib/auth'
import { sanitizeFilename } from '@/lib/sanitize'
import { VALID_DESTINATIONS } from '@/lib/constants'
import { getRemoteFolder } from '@/lib/github'

export const runtime = 'nodejs'
export const dynamic = 'force-dynamic'

/**
 * GET /api/upload/check?destination=...&folderName=...
 * Check if a folder already exists on the remote repo and return file SHAs.
 */
export async function GET(req: NextRequest) {
  const authError = validateUploadSecret(req)
  if (authError) return authError

  const { searchParams } = new URL(req.url)
  const destination = searchParams.get('destination')?.trim()
  const folderName = searchParams.get('folderName')?.trim()

  if (!destination || !folderName) {
    return NextResponse.json({ success: false, error: 'Parametres manquants' }, { status: 400 })
  }

  if (!VALID_DESTINATIONS.has(destination as never)) {
    return NextResponse.json({ success: false, error: 'Destination invalide' }, { status: 400 })
  }

  const safeFolderName = sanitizeFilename(folderName).replace(/[^a-zA-Z0-9-_]/g, '-')
  const folderPath = `public/models/${destination}/${safeFolderName}`

  try {
    const { exists, files } = await getRemoteFolder(folderPath)

    if (exists) {
      return NextResponse.json({
        success: true,
        exists: true,
        path: folderPath,
        files,
      })
    }

    return NextResponse.json({ success: true, exists: false })
  } catch (err) {
    const message = err instanceof Error ? err.message : 'Erreur inconnue'
    return NextResponse.json({ success: false, error: message }, { status: 500 })
  }
}