import { NextResponse } from 'next/server'
import { nanoid } from 'nanoid'
import { addFile } from '@/lib/store'
import type { FileRecord } from '@/lib/store'

const ALLOWED_EXTENSIONS = ['.backerup', '.json']
const MAX_SIZE_BYTES = 500 * 1024 * 1024 // 500 MB

export async function POST(request: Request) {
  let formData: FormData
  try {
    formData = await request.formData()
  } catch {
    return NextResponse.json({ error: 'Invalid form data' }, { status: 400 })
  }

  const file = formData.get('file')
  if (!(file instanceof File)) {
    return NextResponse.json({ error: 'No file provided' }, { status: 400 })
  }

  const nameLower = file.name.toLowerCase()
  if (!ALLOWED_EXTENSIONS.some((ext) => nameLower.endsWith(ext))) {
    return NextResponse.json(
      { error: 'Only .backerup and .json files are accepted' },
      { status: 400 },
    )
  }

  const buffer = Buffer.from(await file.arrayBuffer())
  if (buffer.byteLength > MAX_SIZE_BYTES) {
    return NextResponse.json({ error: 'File exceeds 500 MB limit' }, { status: 413 })
  }

  const type: FileRecord['type'] = nameLower.endsWith('.backerup') ? 'backerup' : 'config'
  const description = String(formData.get('description') ?? '').trim() || undefined
  const displayName = String(formData.get('displayName') ?? '').trim() || undefined
  const group = String(formData.get('group') ?? '').trim() || undefined

  let containerName: string | undefined
  let image: string | undefined
  if (type === 'config') {
    try {
      const raw = JSON.parse(buffer.toString('utf-8')) as Record<string, unknown>
      const name = String((raw.Name as string | undefined) ?? '').replace(/^\//, '')
      containerName = name || undefined
      const cfg = raw.Config as Record<string, unknown> | undefined
      image = (cfg?.Image as string | undefined) || undefined
    } catch {
      // Not valid JSON — still accept the file
    }
  }

  const token = nanoid(10)
  const record: FileRecord = {
    token,
    originalName: file.name,
    displayName,
    size: buffer.byteLength,
    type,
    uploadedAt: new Date().toISOString(),
    description,
    group,
    containerName,
    image,
  }

  await addFile(record, buffer)
  return NextResponse.json({ token })
}