import { Request, Response } from 'express';
import * as consentPublicService from '../services/consent-public.service.js';
import { createAuditLog } from '../services/audit.service.js';
import { CONSENT_TYPE_LABELS } from '../services/consent.service.js';
import { ConsentType } from '@prisma/client';
import { sendEmail } from '../services/smtpService.js';
import { getSystemEmailCredentials } from '../services/emailProvider/emailProviderService.js';

/**
 * Öffentliche Consent-Seite: Kundendaten + Datenschutztext + Status
 */
export async function getConsentPage(req: Request, res: Response) {
  try {
    const { hash } = req.params;

    const result = await consentPublicService.getCustomerByConsentHash(hash);
    if (!result) {
      return res.status(404).json({ success: false, error: 'Ungültiger Link' });
    }

    const privacyPolicyHtml = await consentPublicService.getPrivacyPolicyHtml(result.customer.id);

    // Consent-Status mit Labels
    const consentsWithLabels = result.consents.map((c) => ({
      consentType: c.consentType,
      status: c.status,
      label: CONSENT_TYPE_LABELS[c.consentType as ConsentType]?.label || c.consentType,
      description: CONSENT_TYPE_LABELS[c.consentType as ConsentType]?.description || '',
      grantedAt: c.grantedAt,
    }));

    res.json({
      success: true,
      data: {
        customer: {
          firstName: result.customer.firstName,
          lastName: result.customer.lastName,
          customerNumber: result.customer.customerNumber,
        },
        privacyPolicyHtml,
        consents: consentsWithLabels,
        allGranted: consentsWithLabels.every((c) => c.status === 'GRANTED'),
      },
    });
  } catch (error) {
    console.error('Fehler beim Laden der Consent-Seite:', error);
    res.status(500).json({ success: false, error: 'Fehler beim Laden' });
  }
}

/**
 * Alle 4 Einwilligungen erteilen (öffentlicher Link)
 */
export async function grantAllConsents(req: Request, res: Response) {
  try {
    const { hash } = req.params;
    const ipAddress = req.ip || req.socket.remoteAddress || 'unknown';

    const results = await consentPublicService.grantAllConsentsPublic(hash, ipAddress);

    // Audit-Log (manuell, da keine Auth-Middleware)
    const customer = await consentPublicService.getCustomerByConsentHash(hash);
    if (customer) {
      for (const type of Object.values(ConsentType)) {
        await createAuditLog({
          userEmail: customer.customer.email || 'public-link',
          action: 'UPDATE',
          sensitivity: 'HIGH',
          resourceType: 'CustomerConsent',
          resourceId: `${customer.customer.id}:${type}`,
          resourceLabel: `Einwilligung ${type} erteilt via Public-Link`,
          endpoint: `/api/public/consent/${hash}/grant`,
          httpMethod: 'POST',
          ipAddress,
          dataSubjectId: customer.customer.id,
          legalBasis: 'DSGVO Art. 6 Abs. 1 lit. a',
        });
      }
    }

    // Bestätigungs-E-Mail senden
    if (customer?.customer.email) {
      try {
        const systemEmail = await getSystemEmailCredentials();
        if (systemEmail) {
          const consentList = Object.values(ConsentType)
            .map(t => CONSENT_TYPE_LABELS[t]?.label || t)
            .map(label => `<li>${label}</li>`)
            .join('');

          const confirmationHtml = `
            <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
              <h2 style="color: #16a34a;">Bestätigung Ihrer Einwilligungen</h2>
              <p>Sehr geehrte(r) ${customer.customer.firstName} ${customer.customer.lastName},</p>
              <p>
                vielen Dank! Hiermit bestätigen wir, dass Sie am ${new Date().toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' })}
                folgenden Einwilligungen zugestimmt haben:
              </p>
              <ul style="color: #16a34a;">
                ${consentList}
              </ul>
              <p>
                Sie können Ihre Einwilligungen jederzeit über Ihr Kundenportal widerrufen.
              </p>
              <hr style="border: none; border-top: 1px solid #e5e7eb; margin: 24px 0;">
              <p style="color: #9ca3af; font-size: 12px;">
                Hacker-Net Telekommunikation – Stefan Hacker<br>
                Am Wunderburgpark 5b, 26135 Oldenburg<br>
                info@hacker-net.de
              </p>
            </div>
          `;

          await sendEmail(
            {
              host: systemEmail.smtpServer,
              port: systemEmail.smtpPort,
              user: systemEmail.emailAddress,
              password: systemEmail.password,
              encryption: systemEmail.smtpEncryption,
              allowSelfSignedCerts: systemEmail.allowSelfSignedCerts,
            },
            systemEmail.emailAddress,
            {
              to: customer.customer.email,
              subject: 'Bestätigung Ihrer Datenschutz-Einwilligungen',
              html: confirmationHtml,
            },
            {
              context: 'consent-confirmation',
              customerId: customer.customer.id,
            }
          );
        }
      } catch (emailError) {
        // E-Mail-Fehler soll den Consent-Grant nicht blockieren
        console.error('Bestätigungs-E-Mail konnte nicht gesendet werden:', emailError);
      }
    }

    res.json({ success: true, data: results });
  } catch (error: any) {
    console.error('Fehler beim Erteilen der Einwilligungen:', error);
    res.status(400).json({ success: false, error: error.message || 'Fehler beim Erteilen' });
  }
}

/**
 * Datenschutzerklärung als PDF
 */
export async function getConsentPdf(req: Request, res: Response) {
  try {
    const { hash } = req.params;

    const result = await consentPublicService.getCustomerByConsentHash(hash);
    if (!result) {
      return res.status(404).json({ success: false, error: 'Ungültiger Link' });
    }

    const pdfBuffer = await consentPublicService.generateConsentPdf(result.customer.id);

    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader('Content-Disposition', 'inline; filename="datenschutzerklaerung.pdf"');
    res.send(pdfBuffer);
  } catch (error) {
    console.error('Fehler beim Generieren des PDFs:', error);
    res.status(500).json({ success: false, error: 'Fehler beim Generieren' });
  }
}