/**
 * Feature Store -- Users activate feature instances in their own mandates.
 * Uses the Own Instance Pattern -- each activation creates a dedicated FeatureInstance
 * in the selected mandate. Explicit mandate selection required.
 */

import React from 'react';
import { FaCogs, FaComments, FaHeadset, FaProjectDiagram } from 'react-icons/fa';
import { useLanguage } from '../providers/language/LanguageContext';
import { useStore } from '../hooks/useStore';
import type { StoreFeature, UserMandate } from '../api/storeApi';
import { formatBinaryDataSizeFromMebibytes } from '../utils/formatDataSize';
import styles from './Store.module.css';

const FEATURE_ICONS: Record<string, React.ReactNode> = {
  automation: <FaCogs />,
  graphicalEditor: <FaProjectDiagram />,
  teamsbot: <FaHeadset />,
  workspace: <FaComments />,
  commcoach: <FaComments />,
};

/** Fallback when GET /store/features omits description (German i18n keys). */
const STORE_FEATURE_DESCRIPTION_FALLBACK: Record<string, string> = {
  automation: 'Erstelle und verwalte Automatisierungen, um wiederkehrende Aufgaben effizient zu erledigen.',
  graphicalEditor: 'n8n-style Flow-Automatisierung mit grafischem Editor, RAG und Tools.',
  teamsbot: 'Integriere einen AI-Bot in deine Microsoft Teams Meetings und Channels.',
  workspace: 'Nutze den gemeinsamen AI Workspace: Chats, Tools und Kontext pro Instanz.',
  commcoach: 'CommCoach: Kommunikation trainieren mit KI-gestütztem Coaching und Feedback.',
};

function _storeCardDescription(feature: StoreFeature, t: (key: string, fallback?: string) => string): string {
  const raw =
    (feature.description && feature.description.trim()) ||
    STORE_FEATURE_DESCRIPTION_FALLBACK[feature.featureCode];
  return raw ? t(raw) : '';
}

interface FeatureCardProps {
  feature: StoreFeature;
  mandates: UserMandate[];
  actionLoading: string | null;
  onActivate: (code: string, mandateId?: string) => void;
  onDeactivate: (code: string, mandateId: string, instanceId: string) => void;
}

const FeatureCard: React.FC<FeatureCardProps> = ({
  feature,
  mandates,
  actionLoading,
  onActivate,
  onDeactivate,
}) => {
  const { t } = useLanguage();
  const isProcessing = actionLoading === feature.featureCode;
  const icon = FEATURE_ICONS[feature.featureCode];
  const activeInstances = feature.instances.filter(inst => inst.isActive);
  const hasActive = activeInstances.length > 0;

  return (
    <div className={`${styles.card} ${hasActive ? styles.cardActive : ''}`}>
      <div className={styles.cardHeader}>
        {icon && <span className={styles.cardIcon}>{icon}</span>}
        <h3 className={styles.cardTitle}>
          {t(feature.label)}
        </h3>
      </div>

      <div className={styles.cardBody}>
        <p className={styles.cardDescription}>
          {_storeCardDescription(feature, t)}
        </p>
      </div>

      {activeInstances.length > 0 && (
        <div className={styles.instanceList}>
          {activeInstances.map((inst) => (
            <div key={inst.instanceId} className={styles.instanceRow}>
              <div className={styles.instanceInfo}>
                <span className={`${styles.statusBadge} ${styles.statusActive}`}>
                  <span className={styles.statusDot} />
                  {inst.mandateName || inst.label}
                </span>
              </div>
              <button
                className={styles.deactivateButtonSmall}
                onClick={() => onDeactivate(feature.featureCode, inst.mandateId, inst.instanceId)}
                disabled={isProcessing}
              >
                {isProcessing ? '...' : t('Deaktivieren')}
              </button>
            </div>
          ))}
        </div>
      )}

      {activeInstances.length === 0 && (
        <div>
          <span className={`${styles.statusBadge} ${styles.statusInactive}`}>
            <span className={styles.statusDot} />
            {t('Verfügbar')}
          </span>
        </div>
      )}

      <div className={styles.cardActions}>
        {feature.canActivate && mandates.map((m) => (
          <button
            key={m.id}
            className={styles.activateButton}
            onClick={() => onActivate(feature.featureCode, m.id)}
            disabled={isProcessing}
          >
            {isProcessing
              ? t('Wird aktiviert…')
              : t('Aktivieren für {name}', { name: String(m.label || m.name) })}
          </button>
        ))}
      </div>
    </div>
  );
};

const StorePage: React.FC = () => {
  const { t } = useLanguage();
  const { features, mandates, subscriptionInfo, loading, actionLoading, error, activate, deactivate } = useStore();

  return (
    <div className={styles.store}>
      <div className={styles.header}>
        <h1>{t('Feature Store')}</h1>
        <p className={styles.subtitle}>
          {t('Aktiviere Features für dein Konto. Deine Daten sind isoliert und nur für dich sichtbar.')}
        </p>
      </div>

      {subscriptionInfo && subscriptionInfo.plan && (
        <div className={styles.subscriptionBanner}>
          <span>{t('Plan:')} <strong>{subscriptionInfo.plan}</strong></span>
          <span className={styles.bannerSeparator}>
            {subscriptionInfo.maxFeatureInstances != null
              ? <>{t('Module')}: {subscriptionInfo.currentFeatureInstances}/{subscriptionInfo.maxFeatureInstances}</>
              : <>{subscriptionInfo.currentFeatureInstances} {t('Module aktiv')}
                  {subscriptionInfo.includedModules != null && subscriptionInfo.includedModules > 0 && (
                    <> ({subscriptionInfo.includedModules} {t('inklusive')})</>
                  )}
                </>
            }
          </span>
          {subscriptionInfo.maxDataVolumeMB != null && (
            <span className={styles.bannerSeparator}>
              {t('Speicher')}:{' '}
              {formatBinaryDataSizeFromMebibytes(subscriptionInfo.maxDataVolumeMB)}
            </span>
          )}
          {subscriptionInfo.budgetAiPerUserCHF != null && subscriptionInfo.budgetAiPerUserCHF > 0 && (
            <span className={styles.bannerSeparator}>
              {t('AI-Budget')}: {subscriptionInfo.budgetAiPerUserCHF} CHF / User
            </span>
          )}
          {subscriptionInfo.status === 'TRIALING' && subscriptionInfo.trialEndsAt && (
            <span className={styles.bannerSeparator}>
              {t('Testphase endet am')}: {new Date(subscriptionInfo.trialEndsAt).toLocaleDateString()}
            </span>
          )}
        </div>
      )}

      {error && <div className={styles.error}>{error}</div>}

      {loading ? (
        <div className={styles.loading}>
          {t('Lade Features…')}
        </div>
      ) : features.length === 0 ? (
        <div className={styles.empty}>
          {t('Keine Features im Store verfügbar.')}
        </div>
      ) : (
        <div className={styles.grid}>
          {features.map((feature) => (
            <FeatureCard
              key={feature.featureCode}
              feature={feature}
              mandates={mandates}
              actionLoading={actionLoading}
              onActivate={activate}
              onDeactivate={deactivate}
            />
          ))}
        </div>
      )}
    </div>
  );
};

export default StorePage;