import { NextRequest, NextResponse } from 'next/server';
import { fetchLadetage, LADEN_THRESHOLD_KW, LADEN_MIN_HOURS } from '@/lib/laden';

// GET /api/laden?month=YYYY-MM
// Liefert die Tage (Tages-Anfangs-Zeitstempel ms), an denen das E-Auto geladen wurde.
export async function GET(request: NextRequest) {
  const month = request.nextUrl.searchParams.get('month');
  if (!month || !/^\d{4}-\d{2}$/.test(month)) {
    return NextResponse.json(
      { success: false, error: 'Parameter month=YYYY-MM erforderlich.' },
      { status: 400 }
    );
  }

  try {
    const days = await fetchLadetage(month);
    return NextResponse.json(
      { success: true, days, thresholdKw: LADEN_THRESHOLD_KW, minHours: LADEN_MIN_HOURS },
      { headers: { 'Cache-Control': 'no-store' } }
    );
  } catch (error) {
    console.error('Laden detection error:', error);
    return NextResponse.json(
      { success: false, error: 'Fehler bei der Lade-Erkennung.' },
      { status: 500 }
    );
  }
}