import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { requireSession } from "@/lib/api-auth";
import { createPresignedUploadUrl } from "@/lib/storage";

const ALLOWED_TYPES = ["image/jpeg", "image/png", "image/webp", "image/avif"] as const;
type AllowedType = (typeof ALLOWED_TYPES)[number];

const Schema = z.object({
  contentType: z.string().refine((t): t is AllowedType => (ALLOWED_TYPES as readonly string[]).includes(t), {
    message: "Content type must be jpeg, png, webp, or avif",
  }),
  recipeId: z.string().uuid(),
});

export async function POST(req: NextRequest) {
  const { session, response } = await requireSession();
  if (response) return response;

  const body = await req.json() as unknown;
  const parsed = Schema.safeParse(body);
  if (!parsed.success) {
    return NextResponse.json({ error: "Validation error", issues: parsed.error.issues }, { status: 400 });
  }

  const ext = parsed.data.contentType.split("/")[1] ?? "jpg";
  const key = `recipes/${parsed.data.recipeId}/photos/${session!.user.id}-${crypto.randomUUID()}.${ext}`;
  const url = await createPresignedUploadUrl(key, parsed.data.contentType);

  return NextResponse.json({ url, key });
}