import { auth } from '../../../../../auth';

const API_BASE = process.env.NEXT_PUBLIC_API_URL_INTERNAL || 'http://recipe-api:8080';

async function getAuthHeaders(): Promise<Record<string, string>> {
  const session = await auth();
  if (!session?.accessToken) {
    return {};
  }
  return { Authorization: `Bearer ${session.accessToken}` };
}

// PATCH /api/admin/product/[id]
// Body: { name, canonicalName, category, subcategory, brand, categoryId, tags }
export async function PATCH(
  req: Request,
  { params }: { params: Promise<{ id: string }> },
) {
  try {
    const { id } = await params;
    const productId = Number(id);
    if (!productId) return Response.json({ error: 'Invalid id' }, { status: 400 });

    const body = await req.json();
    const { name, canonicalName, category, subcategory, brand, categoryId, tags } = body;

    if (!name || typeof name !== 'string' || !name.trim()) {
      return Response.json({ error: 'Namn får inte vara tomt.' }, { status: 400 });
    }

    const authHeaders = await getAuthHeaders();
    if (!authHeaders.Authorization) {
      return Response.json({ error: 'Unauthorized' }, { status: 401 });
    }

    console.log('[api/admin/product] PATCH product', productId);

    // 1. Update product fields
    const patchRes = await fetch(`${API_BASE}/api/products/${productId}`, {
      method: 'PATCH',
      headers: { 'Content-Type': 'application/json', ...authHeaders },
      body: JSON.stringify({
        name: name.trim(),
        canonicalName: canonicalName?.trim() || undefined,
        category: category?.trim() || null,
        subcategory: subcategory?.trim() || null,
        brand: brand?.trim() || null,
        categoryId: categoryId ?? null,
      }),
    });

    if (!patchRes.ok) {
      const text = await patchRes.text();
      console.error('[api/admin/product] PATCH failed:', patchRes.status, text);
      return Response.json({ error: `Kunde inte uppdatera produkt: ${text}` }, { status: patchRes.status });
    }

    console.log('[api/admin/product] PATCH OK');

    // 2. Update tags
    const tagsRes = await fetch(`${API_BASE}/api/products/${productId}/tags`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json', ...authHeaders },
      body: JSON.stringify({ tags: tags ?? [] }),
    });

    if (!tagsRes.ok) {
      const text = await tagsRes.text();
      console.error('[api/admin/product] tags PUT failed:', tagsRes.status, text);
      return Response.json({ error: `Kunde inte uppdatera taggar: ${text}` }, { status: tagsRes.status });
    }

    console.log('[api/admin/product] tags PUT OK');

    // 3. Return the complete updated product
    const fullRes = await fetch(`${API_BASE}/api/products/${productId}`, {
      headers: authHeaders,
    });

    if (!fullRes.ok) {
      return Response.json({ error: 'Produkt uppdaterad men kunde inte hämtas' }, { status: 500 });
    }

    const product = await fullRes.json();
    console.log('[api/admin/product] returning full product id:', product?.id);
    return Response.json(product);
  } catch (err) {
    console.error('[api/admin/product] PATCH error:', err);
    return Response.json(
      { error: err instanceof Error ? err.message : 'Unknown error' },
      { status: 500 },
    );
  }
}

// DELETE /api/admin/product/[id]
export async function DELETE(
  _req: Request,
  { params }: { params: Promise<{ id: string }> },
) {
  try {
    const { id } = await params;
    const productId = Number(id);
    if (!productId) return Response.json({ error: 'Invalid id' }, { status: 400 });

    const authHeaders = await getAuthHeaders();
    if (!authHeaders.Authorization) {
      return Response.json({ error: 'Unauthorized' }, { status: 401 });
    }

    console.log('[api/admin/product] DELETE product', productId);

    const res = await fetch(`${API_BASE}/api/products/${productId}`, {
      method: 'DELETE',
      headers: authHeaders,
    });

    if (!res.ok) {
      const text = await res.text();
      console.error('[api/admin/product] DELETE failed:', res.status, text);
      return Response.json({ error: `Kunde inte ta bort produkt: ${text}` }, { status: res.status });
    }

    console.log('[api/admin/product] DELETE OK');
    return new Response(null, { status: 204 });
  } catch (err) {
    console.error('[api/admin/product] DELETE error:', err);
    return Response.json(
      { error: err instanceof Error ? err.message : 'Unknown error' },
      { status: 500 },
    );
  }
}