/**
 * Multi-Tenant Mandate Types
 * 
 * Hierarchie: Mandate → Feature → Instanz → Views/Permissions
 * 
 * Ein User gehört KEINEM Mandanten direkt an.
 * Er hat Zugriff auf Feature-Instanzen, die zu Mandanten gehören.
 */

// =============================================================================
// ACCESS LEVELS
// =============================================================================

/**
 * Access Level für CRUD-Operationen
 * - 'n': None - Kein Zugriff
 * - 'm': My - Nur eigene Datensätze
 * - 'g': Group - Alle Datensätze der Instanz
 * - 'a': All - Alle Datensätze (mandantenübergreifend)
 */
export type AccessLevel = 'n' | 'm' | 'g' | 'a';

// =============================================================================
// PERMISSIONS
// =============================================================================

/**
 * Tabellen-Berechtigungen
 */
export interface TablePermission {
  view: boolean;
  read: AccessLevel;
  create: AccessLevel;
  update: AccessLevel;
  delete: AccessLevel;
}

/**
 * Feld-Berechtigungen (optional, nur wo eingeschränkt)
 */
export interface FieldPermission {
  read: boolean;
  write: boolean;
}

/**
 * Summarische Berechtigungen pro Feature-Instanz
 * Werden einmalig beim Login/Refresh geladen
 */
export interface InstancePermissions {
  // Tabellen-Level (CRUD pro Tabelle)
  tables: Record<string, TablePermission>;
  
  // Feld-Level (nur wo eingeschränkt)
  fields?: Record<string, Record<string, FieldPermission>>;
  
  // View-Level (Navigation)
  // Keys are view codes like "trustee-positions", values are boolean visibility
  // Special key "_all" means all views are visible
  views: Record<string, boolean>;
  
  // Admin flag (has admin role in this instance)
  isAdmin?: boolean;
}

// =============================================================================
// FEATURE INSTANCE
// =============================================================================

/**
 * Eine Feature-Instanz ist die Arbeitseinheit für einen User
 * z.B. "Trustee für PamoCreate AG bei Soha Treuhand"
 */
export interface FeatureInstance {
  id: string;                    // UUID der Instanz
  featureCode: string;           // "trustee", "chatbot", "chatworkflow", etc.
  mandateId: string;             // Zugehöriger Mandant
  mandateName: string;           // Für Anzeige
  instanceLabel: string;         // z.B. "PamoCreate AG"
  userRoles: string[];            // Rollen des Users in dieser Instanz (kann mehrere haben)
  permissions: InstancePermissions;
}

// =============================================================================
// MANDATE FEATURE
// =============================================================================

/**
 * Ein Feature innerhalb eines Mandanten
 * Gruppiert alle Instanzen eines Feature-Typs
 */
export interface MandateFeature {
  code: string;                  // "trustee", "chatbot", "chatworkflow", etc.
  label: string;                 // German plaintext i18n key
  icon: string;                  // Material/React Icon Name
  instances: FeatureInstance[];
}

// =============================================================================
// MANDATE
// =============================================================================

/**
 * Ein Mandant (oberste Ebene)
 * Enthält mehrere Features mit deren Instanzen
 */
export interface Mandate {
  id: string;                    // mandateId
  name: string;                  // Technischer Identifier
  label?: string;                // Anzeige-Label (fuer FK-Referenzen und UI)
  code?: string;                 // Optionaler Code
  features: MandateFeature[];
}

// =============================================================================
// API RESPONSE
// =============================================================================

/**
 * Response von GET /features/my
 * Enthält alle für den User sichtbaren Mandate + Features + Instanzen + Permissions
 */
export interface FeaturesMyResponse {
  mandates: Mandate[];
}

// =============================================================================
// USER (Ohne Mandant-Zugehörigkeit)
// =============================================================================

/**
 * User-Daten nach Login
 * KEIN mandateId mehr - User arbeitet mit Feature-Instanzen
 */
export interface User {
  id: string;
  username: string;
  email: string;
  fullName: string;
  language: string;
  enabled: boolean;
  authenticationAuthority: string;
  isSysAdmin: boolean;
  roleLabels?: string[];         // System-weite Rollen (z.B. ["sysadmin"])
}

// =============================================================================
// NAVIGATION
// =============================================================================

/**
 * View-Definition für Feature-Navigation
 */
export interface FeatureView {
  code: string;                  // z.B. "dashboard", "contracts", "documents"
  label: string;                 // German plaintext i18n key
  icon?: string;
  path: string;                  // Relativer Pfad innerhalb der Instanz
  adminOnly?: boolean;           // Nur für Admin-Rollen sichtbar
}

/**
 * Feature-Konfiguration für Navigation
 * Definiert welche Views ein Feature hat
 */
export interface FeatureConfig {
  code: string;
  label: string;                 // German plaintext i18n key
  icon: string;
  views: FeatureView[];
  deprecated?: boolean;
}

// =============================================================================
// FEATURE REGISTRY (DEPRECATED)
// =============================================================================

/**
 * @deprecated Since Navigation-API-Konzept implementation.
 * 
 * Navigation is now provided by the backend via GET /api/navigation.
 * The backend is the Single Source of Truth for navigation structure.
 * 
 * Icon mapping is now handled by src/config/pageRegistry.ts using uiComponent codes.
 * 
 * This registry is kept for backward compatibility with existing code that may
 * still reference it. It will be removed in a future version.
 * 
 * TODO: Remove after all references are migrated to use backend navigation.
 */
export const FEATURE_REGISTRY: Record<string, FeatureConfig> = {
  trustee: {
    code: 'trustee',
    label: 'Treuhand',
    icon: 'briefcase',
    views: [
      { code: 'dashboard', label: 'Übersicht', path: 'dashboard' },
      { code: 'positions', label: 'Positionen', path: 'positions' },
      { code: 'documents', label: 'Dokumente', path: 'documents' },
      { code: 'position-documents', label: 'Zuordnungen', path: 'position-documents' },
      { code: 'expense-import', label: 'Spesen Import', path: 'expense-import' },
      { code: 'scan-upload', label: 'Scannen / Hochladen', path: 'scan-upload' },
      { code: 'instance-roles', label: 'Rollen & Rechte', path: 'instance-roles', adminOnly: true },
      { code: 'settings', label: 'Buchhaltungseinstellungen', path: 'settings' },
    ]
  },
  chatworkflow: {
    code: 'chatworkflow',
    label: 'Workflow',
    icon: 'play_circle',
    views: [
      { code: 'dashboard', label: 'Übersicht', path: 'dashboard' },
      { code: 'runs', label: 'Runs', path: 'runs' },
      { code: 'files', label: 'Dateien', path: 'files' },
    ]
  },
  chatbot: {
    code: 'chatbot',
    label: 'Chatbot',
    icon: 'chat',
    views: [
      { code: 'conversations', label: 'Konversationen', path: 'conversations' },
      { code: 'settings', label: 'Einstellungen', path: 'settings' },
    ]
  },
  realestate: {
    code: 'realestate',
    label: 'Immobilien',
    icon: 'home',
    views: [
      { code: 'dashboard', label: 'Karte', path: 'dashboard' },
      { code: 'instance-roles', label: 'Rollen & Rechte', path: 'instance-roles', adminOnly: true },
    ]
  },
  teamsbot: {
    code: 'teamsbot',
    label: 'Teams Bot',
    icon: 'headset_mic',
    views: [
      { code: 'dashboard', label: 'Übersicht', path: 'dashboard' },
      { code: 'sessions', label: 'Sitzungen', path: 'sessions' },
      { code: 'settings', label: 'Einstellungen', path: 'settings' },
    ]
  },
  graphicalEditor: {
    code: 'graphicalEditor',
    label: 'Grafischer Editor',
    icon: 'sitemap',
    views: [
      { code: 'editor', label: 'Editor', path: 'editor' },
      { code: 'workflows', label: 'Workflows', path: 'workflows' },
      { code: 'templates', label: 'Vorlagen', path: 'templates' },
      { code: 'workflows-tasks', label: 'Tasks', path: 'workflows-tasks' },
      { code: 'dashboard', label: 'Dashboard', path: 'dashboard' },
    ]
  },
  neutralization: {
    code: 'neutralization',
    label: 'Neutralisierung',
    icon: 'shield_check',
    views: [
      { code: 'dashboard', label: 'Neutralisierung testen', path: 'playground' },
      { code: 'playground', label: 'Neutralisierung testen', path: 'playground' },
      { code: 'config', label: 'Einstellungen', path: 'config' },
      { code: 'attributes', label: 'Attribute', path: 'attributes' },
    ]
  },
  commcoach: {
    code: 'commcoach',
    label: 'Kommunikations-Coach',
    icon: 'account_voice',
    views: [
      { code: 'dashboard', label: 'Dashboard', path: 'dashboard' },
      { code: 'coaching', label: 'Coaching', path: 'coaching' },
      { code: 'dossier', label: 'Dossier', path: 'dossier' },
      { code: 'settings', label: 'Einstellungen', path: 'settings' },
    ]
  },
  workspace: {
    code: 'workspace',
    label: 'AI Workspace',
    icon: 'psychology',
    views: [
      { code: 'dashboard', label: 'Dashboard', path: 'dashboard' },
      { code: 'editor', label: 'Editor', path: 'editor' },
      { code: 'rag-insights', label: 'Wissens-Insights', path: 'rag-insights' },
      { code: 'settings', label: 'Einstellungen', path: 'settings' },
    ]
  },
};

// =============================================================================
// HELPERS
// =============================================================================

/**
 * Prüft ob ein AccessLevel Zugriff gewährt (nicht 'n')
 */
export function hasAccess(level: AccessLevel): boolean {
  return level !== 'n';
}

/**
 * Prüft ob ein User einen Datensatz bearbeiten darf basierend auf AccessLevel
 */
export function canAccessRecord(
  level: AccessLevel,
  record: { sysCreatedBy?: string },
  userId: string
): boolean {
  switch (level) {
    case 'n':
      return false;
    case 'm':
      return record.sysCreatedBy === userId;
    case 'g':
    case 'a':
      return true;
    default:
      return false;
  }
}