import { NextRequest, NextResponse } from 'next/server';
import { getBrevoCampaignUrl } from '@/lib/brevo';

export async function GET(req: NextRequest) {
  try {
    const { searchParams } = new URL(req.url);
    const campaignId = searchParams.get('campaignId');

    if (!campaignId) {
      return NextResponse.json(
        { exists: false, error: 'Chýba parameter campaignId' },
        { status: 400 }
      );
    }

    const apiKey = process.env.BREVO_API_KEY;
    if (!apiKey) {
      return NextResponse.json(
        { exists: false, error: 'BREVO_API_KEY nie je nakonfigurovaný' },
        { status: 500 }
      );
    }

    const res = await fetch(`https://api.brevo.com/v3/emailCampaigns/${encodeURIComponent(campaignId)}`, {
      method: 'GET',
      headers: {
        'accept': 'application/json',
        'api-key': apiKey
      },
      cache: 'no-store'
    });

    if (res.status === 404) {
      return NextResponse.json({
        exists: false,
        message: 'Kampaň s týmto ID v Brevo neexistuje alebo bola vymazaná.'
      });
    }

    if (!res.ok) {
      const errData = await res.json().catch(() => ({}));
      return NextResponse.json({
        exists: false,
        error: errData.message || `Brevo API vrátilo status ${res.status}`
      });
    }

    const data = await res.json();
    return NextResponse.json({
      exists: true,
      campaignId: data.id,
      name: data.name,
      status: data.status,
      subject: data.subject,
      brevoUrl: getBrevoCampaignUrl(data.id),
      brevoListingUrl: 'https://app.brevo.com/campaigns/listing'
    });
  } catch (err: any) {
    console.error('Brevo verify error:', err);
    return NextResponse.json(
      { exists: false, error: err.message || 'Chyba spojenia s Brevo' },
      { status: 500 }
    );
  }
}