/**
 * Entitlements Hook
 *
 * Provides utilities for checking feature availability based on the new billing system.
 * This replaces the legacy usePlanFeatures hook for new billing-aware features.
 */

import { useQuery } from '@tanstack/react-query';
import { getEntitlements, Entitlements } from '../api/billing';

export interface UseEntitlementsResult {
  /**
   * The raw entitlements map
   */
  entitlements: Entitlements;

  /**
   * Whether entitlements are still loading
   */
  isLoading: boolean;

  /**
   * Check if a boolean feature is enabled
   */
  hasFeature: (featureCode: string) => boolean;

  /**
   * Get the limit value for an integer feature
   * Returns null if the feature doesn't exist or is not an integer
   */
  getLimit: (featureCode: string) => number | null;

  /**
   * Refetch entitlements
   */
  refetch: () => void;
}

/**
 * Hook to access entitlements from the billing system.
 *
 * Usage:
 * ```tsx
 * const { hasFeature, getLimit, isLoading } = useEntitlements();
 *
 * if (hasFeature('can_use_sms_reminders')) {
 *   // Show SMS feature
 * }
 *
 * const maxUsers = getLimit('max_users');
 * if (maxUsers !== null && currentUsers >= maxUsers) {
 *   // Show upgrade prompt
 * }
 * ```
 */
export const useEntitlements = (): UseEntitlementsResult => {
  const { data, isLoading, refetch } = useQuery<Entitlements>({
    queryKey: ['entitlements'],
    queryFn: getEntitlements,
    staleTime: 5 * 60 * 1000, // 5 minutes
    retry: 1,
  });

  const entitlements = data ?? {};

  /**
   * Check if a boolean feature is enabled.
   */
  const hasFeature = (featureCode: string): boolean => {
    const value = entitlements[featureCode];
    return value === true;
  };

  /**
   * Get the limit value for an integer feature.
   * Returns null if the feature doesn't exist or is a boolean.
   */
  const getLimit = (featureCode: string): number | null => {
    const value = entitlements[featureCode];
    // Use strict type check to distinguish integers from booleans
    // (typeof true === 'number' is false, but just to be safe)
    if (typeof value === 'number' && !Number.isNaN(value)) {
      return value;
    }
    return null;
  };

  return {
    entitlements,
    isLoading,
    hasFeature,
    getLimit,
    refetch: () => refetch(),
  };
};

/**
 * Feature code constants for type safety
 */
export const FEATURE_CODES = {
  // Boolean features (permissions)
  CAN_ACCEPT_PAYMENTS: 'can_accept_payments',
  CAN_USE_CUSTOM_DOMAIN: 'can_use_custom_domain',
  CAN_WHITE_LABEL: 'can_white_label',
  CAN_API_ACCESS: 'can_api_access',
  CAN_USE_SMS_REMINDERS: 'can_use_sms_reminders',
  CAN_USE_MASKED_PHONE_NUMBERS: 'can_use_masked_phone_numbers',
  CAN_USE_MOBILE_APP: 'can_use_mobile_app',
  CAN_USE_CONTRACTS: 'can_use_contracts',
  CAN_USE_CALENDAR_SYNC: 'can_use_calendar_sync',
  CAN_USE_WEBHOOKS: 'can_use_webhooks',
  CAN_USE_PLUGINS: 'can_use_plugins',
  CAN_USE_TASKS: 'can_use_tasks',
  CAN_CREATE_PLUGINS: 'can_create_plugins',
  CAN_EXPORT_DATA: 'can_export_data',
  CAN_ADD_VIDEO_CONFERENCING: 'can_add_video_conferencing',
  CAN_BOOK_REPEATED_EVENTS: 'can_book_repeated_events',
  CAN_REQUIRE_2FA: 'can_require_2fa',
  CAN_DOWNLOAD_LOGS: 'can_download_logs',
  CAN_DELETE_DATA: 'can_delete_data',
  CAN_USE_POS: 'can_use_pos',
  CAN_MANAGE_OAUTH_CREDENTIALS: 'can_manage_oauth_credentials',
  CAN_CONNECT_TO_API: 'can_connect_to_api',

  // Integer features (limits)
  MAX_USERS: 'max_users',
  MAX_RESOURCES: 'max_resources',
  MAX_EVENT_TYPES: 'max_event_types',
  MAX_CALENDARS_CONNECTED: 'max_calendars_connected',
  MAX_PUBLIC_PAGES: 'max_public_pages',
} as const;

export type FeatureCode = (typeof FEATURE_CODES)[keyof typeof FEATURE_CODES];