import { NextResponse } from 'next/server';
import { regeneratePackAsset } from '@/lib/packGenerator';
import { loadSession, saveSession } from '@/lib/storage';
import type { RegenerateAssetRequest, RegenerateAssetResponse } from '@/lib/types';

export const runtime = 'nodejs';
export const dynamic = 'force-dynamic';

export async function POST(req: Request, ctx: { params: Promise<{ assetId: string }> }) {
  const { assetId } = await ctx.params;
  const { sessionId, userRefinement } = (await req.json()) as RegenerateAssetRequest;

  if (!assetId || !sessionId) {
    return NextResponse.json({ error: 'assetId and sessionId required' }, { status: 400 });
  }

  const session = await loadSession(sessionId);
  if (!session) return NextResponse.json({ error: 'session not found' }, { status: 404 });

  try {
    const regenerated = await regeneratePackAsset({ session, assetId, userRefinement });
    await saveSession(session);
    return NextResponse.json({
      asset: regenerated.asset,
      pack: regenerated.pack,
      provider: regenerated.provider,
    } satisfies RegenerateAssetResponse);
  } catch (error) {
    return NextResponse.json({ error: String(error) }, { status: 500 });
  }
}