/**
 * React UI components for the consent SDK.
 *
 * Phase 4: extracted from index.tsx to keep the main file under 500 LOC.
 * Exports ConsentGate, ConsentPlaceholder, and ConsentBanner (all headless).
 */

import type { FC, ReactNode } from 'react';
import type {
  ConsentCategories,
  ConsentCategory,
  ConsentState,
} from '../types';
import { useConsent } from './hooks';

// =============================================================================
// ConsentGate
// =============================================================================

interface ConsentGateProps {
  /** Erforderliche Kategorie */
  category: ConsentCategory;
  /** Inhalt bei Consent */
  children: ReactNode;
  /** Inhalt ohne Consent */
  placeholder?: ReactNode;
  /** Fallback waehrend Laden */
  fallback?: ReactNode;
}

/**
 * ConsentGate - zeigt Inhalt nur bei Consent.
 */
export const ConsentGate: FC<ConsentGateProps> = ({
  category,
  children,
  placeholder = null,
  fallback = null,
}) => {
  const { hasConsent, isLoading } = useConsent();

  if (isLoading) {
    return <>{fallback}</>;
  }

  if (!hasConsent(category)) {
    return <>{placeholder}</>;
  }

  return <>{children}</>;
};

// =============================================================================
// ConsentPlaceholder
// =============================================================================

interface ConsentPlaceholderProps {
  category: ConsentCategory;
  message?: string;
  buttonText?: string;
  className?: string;
}

/**
 * ConsentPlaceholder - Placeholder fuer blockierten Inhalt.
 */
export const ConsentPlaceholder: FC<ConsentPlaceholderProps> = ({
  category,
  message,
  buttonText,
  className = '',
}) => {
  const { showSettings } = useConsent();

  const categoryNames: Record<ConsentCategory, string> = {
    essential: 'Essentielle Cookies',
    functional: 'Funktionale Cookies',
    analytics: 'Statistik-Cookies',
    marketing: 'Marketing-Cookies',
    social: 'Social Media-Cookies',
  };

  const defaultMessage = `Dieser Inhalt erfordert ${categoryNames[category]}.`;

  return (
    <div className={`bp-consent-placeholder ${className}`}>
      <p>{message || defaultMessage}</p>
      <button type="button" onClick={showSettings}>
        {buttonText || 'Cookie-Einstellungen oeffnen'}
      </button>
    </div>
  );
};

// =============================================================================
// ConsentBanner (headless)
// =============================================================================

export interface ConsentBannerRenderProps {
  isVisible: boolean;
  consent: ConsentState | null;
  needsConsent: boolean;
  onAcceptAll: () => void;
  onRejectAll: () => void;
  onSaveSelection: (categories: Partial<ConsentCategories>) => void;
  onShowSettings: () => void;
  onClose: () => void;
}

interface ConsentBannerProps {
  render?: (props: ConsentBannerRenderProps) => ReactNode;
  className?: string;
}

/**
 * ConsentBanner - Headless Banner-Komponente.
 * Kann mit eigener UI gerendert werden oder nutzt Default-UI.
 */
export const ConsentBanner: FC<ConsentBannerProps> = ({ render, className }) => {
  const {
    consent,
    isBannerVisible,
    needsConsent,
    acceptAll,
    rejectAll,
    saveSelection,
    showSettings,
    hideBanner,
  } = useConsent();

  const renderProps: ConsentBannerRenderProps = {
    isVisible: isBannerVisible,
    consent,
    needsConsent,
    onAcceptAll: acceptAll,
    onRejectAll: rejectAll,
    onSaveSelection: saveSelection,
    onShowSettings: showSettings,
    onClose: hideBanner,
  };

  if (render) {
    return <>{render(renderProps)}</>;
  }

  if (!isBannerVisible) {
    return null;
  }

  return (
    <div
      className={`bp-consent-banner ${className || ''}`}
      role="dialog"
      aria-modal="true"
      aria-label="Cookie-Einstellungen"
    >
      <div className="bp-consent-banner-content">
        <h2>Datenschutzeinstellungen</h2>
        <p>
          Wir nutzen Cookies und aehnliche Technologien, um Ihnen ein optimales
          Nutzererlebnis zu bieten.
        </p>

        <div className="bp-consent-banner-actions">
          <button
            type="button"
            className="bp-consent-btn bp-consent-btn-reject"
            onClick={rejectAll}
          >
            Alle ablehnen
          </button>
          <button
            type="button"
            className="bp-consent-btn bp-consent-btn-settings"
            onClick={showSettings}
          >
            Einstellungen
          </button>
          <button
            type="button"
            className="bp-consent-btn bp-consent-btn-accept"
            onClick={acceptAll}
          >
            Alle akzeptieren
          </button>
        </div>
      </div>
    </div>
  );
};