import { NextResponse } from "next/server"
import { getSessionUser } from "@/lib/session"
import { saveFile } from "@/lib/storage"

const ALLOWED_SCOPES = ["property-images", "maintenance", "documents", "misc"]

// Allowlisted upload extensions. Deliberately excludes svg and any html/script
// types, which can execute JavaScript when served inline from our origin.
const ALLOWED_EXTENSIONS = [
  "pdf",
  "png",
  "jpg",
  "jpeg",
  "gif",
  "webp",
  "doc",
  "docx",
  "xls",
  "xlsx",
  "csv",
  "txt",
]

// Generic authenticated upload endpoint. Saves the file to local disk under the
// user's namespace and returns a URL pointing at the auth-gated /api/files route.
export async function POST(request: Request) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

  const fd = await request.formData()
  const file = fd.get("file") as File | null
  const scopeRaw = (fd.get("scope") as string) || "misc"
  const scope = ALLOWED_SCOPES.includes(scopeRaw) ? scopeRaw : "misc"
  const fixedName = (fd.get("fixed_name") as string) || undefined

  if (!file) return NextResponse.json({ error: "No file provided" }, { status: 400 })
  if (file.size > 20 * 1024 * 1024) {
    return NextResponse.json({ error: "File too large (max 20 MB)" }, { status: 400 })
  }

  const ext = file.name.split(".").pop()?.toLowerCase() ?? ""
  if (!ALLOWED_EXTENSIONS.includes(ext)) {
    return NextResponse.json({ error: "File type not allowed" }, { status: 400 })
  }

  const { key, size, type } = await saveFile(file, { userId: user.id, scope, fixedName })

  return NextResponse.json({
    url: `/api/files/${key}`,
    key,
    size,
    type,
    name: file.name,
  })
}