import { NextResponse } from 'next/server';
import { auth } from '@/auth';
import { getSystemConfig } from '@/lib/config';
import { getAnyActiveByokForUser } from '@/lib/byok';
import { resolveAiRoute } from '@/lib/ai/router';

/**
 * GET /api/user/ai-status
 * Returns the effective AI provider and model for the current user.
 * Used by the UI to show which model is active (BYOK vs admin).
 */
export async function GET() {
  const session = await auth();
  if (!session?.user?.id) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  const config = await getSystemConfig();
  const adminRoute = resolveAiRoute('chat', config);

  const byok = await getAnyActiveByokForUser(session.user.id, adminRoute.providerType);

  if (byok) {
    const model = (byok.model && byok.model.trim()) ? byok.model : adminRoute.modelName;
    return NextResponse.json({
      usedByok: true,
      provider: byok.provider,
      model,
      source: 'byok',
    });
  }

  return NextResponse.json({
    usedByok: false,
    provider: adminRoute.providerType,
    model: adminRoute.modelName,
    source: 'admin',
  });
}