import { NextRequest, NextResponse } from 'next/server';

export async function POST(req: NextRequest) {
  try {
    const { campaignName, subject, htmlContent, scheduledAt } = await req.json();

    if (!campaignName || !subject || !htmlContent) {
      return NextResponse.json(
        { error: 'Chýbajú povinné polia (campaignName, subject, htmlContent).' },
        { status: 400 }
      );
    }

    const apiKey = process.env.BREVO_API_KEY;
    const senderName = process.env.BREVO_SENDER_NAME || 'Jandl';
    const senderEmail = process.env.BREVO_SENDER_EMAIL || 'tomas.rafay@jandl.sk';

    if (!apiKey) {
      return NextResponse.json(
        { error: 'BREVO_API_KEY nie je nakonfigurovaný na serveri.' },
        { status: 500 }
      );
    }

    // Volanie Brevo API v3
    const payload: any = {
      name: campaignName,
      subject: subject,
      sender: {
        name: senderName,
        email: senderEmail
      },
      type: 'classic',
      htmlContent: htmlContent
    };

    if (scheduledAt) {
      payload.scheduledAt = scheduledAt;
    }

    const brevoRes = await fetch('https://api.brevo.com/v3/emailCampaigns', {
      method: 'POST',
      headers: {
        'accept': 'application/json',
        'content-type': 'application/json',
        'api-key': apiKey
      },
      body: JSON.stringify(payload)
    });

    const data = await brevoRes.json();

    if (!brevoRes.ok) {
      console.error('Brevo API error:', data);
      return NextResponse.json(
        { error: data.message || 'Chyba pri vytváraní kampane v Brevo', details: data },
        { status: brevoRes.status }
      );
    }

    // Úspech - vrátime campaignId a URL na správu v Brevo
    return NextResponse.json({
      success: true,
      campaignId: data.id,
      brevoUrl: `https://app.brevo.com/camp/detail/email/${data.id}`,
      message: 'Kampaň bola úspešne vytvorená v Brevo!'
    });
  } catch (error: any) {
    console.error('Export to Brevo error:', error);
    return NextResponse.json(
      { error: error.message || 'Interná chyba servera' },
      { status: 500 }
    );
  }
}