import { serve } from "https://deno.land/std@0.168.0/http/server.ts";

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
};

serve(async (req) => {
  // Handle CORS preflight requests
  if (req.method === 'OPTIONS') {
    return new Response('ok', { headers: corsHeaders });
  }

  try {
    const { name, email, phone, subject, message, to } = await req.json();

    // Validierung
    if (!name || !email || !subject || !message || !to) {
      return new Response(
        JSON.stringify({ error: 'Missing required fields' }),
        { status: 400, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
      );
    }

    // E-Mail-Inhalt erstellen
    const emailContent = `
Neue Kontaktanfrage von: ${name}
E-Mail: ${email}
Telefon: ${phone || 'Keine Angabe'}

Betreff: ${subject}

Nachricht:
${message}
    `.trim();

    // E-Mail über Resend API senden (oder einen anderen E-Mail-Dienst)
    const resendResponse = await fetch('https://api.resend.com/emails', {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${Deno.env.get('RESEND_API_KEY')}`,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        from: 'kontakt@finanzen-mizera.de',
        to: [to],
        subject: `Kontaktanfrage: ${subject}`,
        html: `
          <h2>Neue Kontaktanfrage</h2>
          <p><strong>Von:</strong> ${name} (${email})</p>
          <p><strong>Telefon:</strong> ${phone || 'Keine Angabe'}</p>
          <p><strong>Betreff:</strong> ${subject}</p>
          <hr>
          <h3>Nachricht:</h3>
          <p>${message.replace(/\n/g, '<br>')}</p>
          <hr>
          <p><small>Gesendet über das Kontaktformular auf finanzen-mizera.de</small></p>
        `,
        text: emailContent,
      }),
    });

    if (!resendResponse.ok) {
      const errorData = await resendResponse.text();
      console.error('Resend API Error:', errorData);
      return new Response(
        JSON.stringify({ error: 'Failed to send email' }),
        { status: 500, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
      );
    }

    const responseData = await resendResponse.json();
    
    return new Response(
      JSON.stringify({ success: true, data: responseData }),
      { status: 200, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
    );

  } catch (error) {
    console.error('Function error:', error);
    return new Response(
      JSON.stringify({ error: error.message }),
      { status: 500, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
    );
  }
});