import { NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/prisma";
import { getThumbnail, loadFileData } from "@/lib/storage";

// Largeurs autorisées pour les rendus redimensionnés (évite la génération arbitraire)
const ALLOWED_WIDTHS = [200, 400, 800, 1280, 2048];

export async function GET(
  request: NextRequest,
  { params }: { params: { id: string } }
) {
  const file = await prisma.file.findUnique({ where: { id: params.id } });

  if (!file) {
    return NextResponse.json({ error: "File not found" }, { status: 404 });
  }

  // --- Rendu image redimensionné (miniature / version viewer) ---
  const wParam = request.nextUrl.searchParams.get("w");
  if (wParam && file.mimeType.startsWith("image/") && file.mimeType !== "image/svg+xml") {
    const requested = parseInt(wParam, 10);
    const width =
      ALLOWED_WIDTHS.find((w) => w >= requested) ??
      ALLOWED_WIDTHS[ALLOWED_WIDTHS.length - 1];
    try {
      const webp = await getThumbnail(file.storagePath, file.id, width, file.isEncrypted);
      return new NextResponse(new Uint8Array(webp), {
        headers: {
          "Content-Type": "image/webp",
          "Content-Length": String(webp.length),
          // Miniatures quasi-immuables (clé = id+largeur), cache agressif navigateur
          "Cache-Control": "private, max-age=604800",
        },
      });
    } catch {
      // En cas d'échec sharp on retombe sur l'original ci-dessous
    }
  }

  // --- Fichier original (déchiffré au repos) ---
  const data = await loadFileData(file.storagePath, file.isEncrypted);

  return new NextResponse(new Uint8Array(data), {
    headers: {
      "Content-Type": file.mimeType,
      "Content-Disposition": `inline; filename="${encodeURIComponent(file.name)}"`,
      "Content-Length": String(data.length),
      "Cache-Control": "private, max-age=3600",
    },
  });
}