/**
 * Offline-Aware API Wrapper
 *
 * Wraps API calls with offline detection and graceful error handling.
 * Provides consistent error messages and retry logic for network failures.
 */

import { api } from './api';
import { isOnline, retryWithBackoff, DEFAULT_RETRY_CONFIG, RetryConfig } from '@/utils/networkStatus';
import type { ApiResponse, ApiError } from '@/types';

/**
 * Network-related error codes
 */
export const NETWORK_ERROR_CODES = {
  OFFLINE: 'NETWORK_OFFLINE',
  TIMEOUT: 'NETWORK_TIMEOUT',
  UNREACHABLE: 'NETWORK_UNREACHABLE',
} as const;

/**
 * User-friendly error messages for network issues
 */
export const NETWORK_ERROR_MESSAGES = {
  OFFLINE: 'No internet connection. Please check your network and try again.',
  TIMEOUT: 'Request timed out. Please try again.',
  UNREACHABLE: 'Unable to reach the server. Please try again later.',
  GENERIC: 'Network error occurred. Please check your connection.',
} as const;

/**
 * Check if error is network-related
 */
export function isNetworkError(error: ApiError): boolean {
  if (!error) return false;

  const code = error.code?.toUpperCase() || '';
  const message = error.message?.toLowerCase() || '';

  return (
    code === 'NETWORK_ERROR' ||
    code === 'NETWORK_OFFLINE' ||
    code === 'NETWORK_TIMEOUT' ||
    code === 'NETWORK_UNREACHABLE' ||
    message.includes('network') ||
    message.includes('offline') ||
    message.includes('connection') ||
    message.includes('timeout') ||
    message.includes('fetch')
  );
}

/**
 * Get user-friendly error message for network errors
 */
export function getNetworkErrorMessage(error: ApiError): string {
  if (!isNetworkError(error)) {
    return error.message || 'An error occurred';
  }

  const code = error.code?.toUpperCase();
  if (code === 'NETWORK_OFFLINE') return NETWORK_ERROR_MESSAGES.OFFLINE;
  if (code === 'NETWORK_TIMEOUT') return NETWORK_ERROR_MESSAGES.TIMEOUT;
  if (code === 'NETWORK_UNREACHABLE') return NETWORK_ERROR_MESSAGES.UNREACHABLE;

  return NETWORK_ERROR_MESSAGES.GENERIC;
}

/**
 * Wrap an API call with offline detection
 *
 * @param apiCall - The API function to call
 * @param options - Configuration options
 * @returns Promise with API response
 *
 * @example
 * const response = await withOfflineCheck(() => api.getAllBeneficiaries());
 * if (!response.ok) {
 *   Alert.alert('Error', getNetworkErrorMessage(response.error));
 * }
 */
export async function withOfflineCheck<T>(
  apiCall: () => Promise<ApiResponse<T>>,
  options: {
    retry?: boolean;
    retryConfig?: RetryConfig;
    offlineMessage?: string;
  } = {}
): Promise<ApiResponse<T>> {
  // Check if online before attempting request
  const online = await isOnline();

  if (!online) {
    return {
      ok: false,
      error: {
        message: options.offlineMessage || NETWORK_ERROR_MESSAGES.OFFLINE,
        code: NETWORK_ERROR_CODES.OFFLINE,
      },
    };
  }

  try {
    // Execute API call with optional retry
    if (options.retry) {
      return await retryWithBackoff(apiCall, options.retryConfig || DEFAULT_RETRY_CONFIG);
    }

    return await apiCall();
  } catch (error) {
    // Convert exception to ApiResponse format
    const apiError: ApiError = {
      message: error instanceof Error ? error.message : 'Unknown error',
      code: 'NETWORK_ERROR',
    };

    return {
      ok: false,
      error: apiError,
    };
  }
}

/**
 * Offline-aware API service
 * Wraps the main API service with network detection
 *
 * Use this instead of direct `api` imports for better offline handling
 */
export const offlineAwareApi = {
  // ==================== Authentication ====================

  async checkEmail(email: string) {
    return withOfflineCheck(() => api.checkEmail(email), {
      retry: true,
      offlineMessage: 'Cannot verify email while offline',
    });
  },

  async requestOTP(email: string) {
    return withOfflineCheck(() => api.requestOTP(email), {
      retry: true,
      offlineMessage: 'Cannot send verification code while offline',
    });
  },

  async verifyOTP(email: string, code: string) {
    return withOfflineCheck(() => api.verifyOTP(email, code), {
      retry: true,
      offlineMessage: 'Cannot verify code while offline',
    });
  },

  async getProfile() {
    return withOfflineCheck(() => api.getProfile(), {
      retry: true,
    });
  },

  async updateProfile(updates: Parameters<typeof api.updateProfile>[0]) {
    return withOfflineCheck(() => api.updateProfile(updates), {
      offlineMessage: 'Cannot update profile while offline',
    });
  },

  async updateProfileAvatar(imageUri: string | null) {
    return withOfflineCheck(() => api.updateProfileAvatar(imageUri), {
      offlineMessage: 'Cannot upload avatar while offline',
    });
  },

  // ==================== Beneficiaries ====================

  async getAllBeneficiaries() {
    return withOfflineCheck(() => api.getAllBeneficiaries(), {
      retry: true,
    });
  },

  async getWellNuoBeneficiary(id: number) {
    return withOfflineCheck(() => api.getWellNuoBeneficiary(id), {
      retry: true,
    });
  },

  async createBeneficiary(data: Parameters<typeof api.createBeneficiary>[0]) {
    return withOfflineCheck(() => api.createBeneficiary(data), {
      offlineMessage: 'Cannot add beneficiary while offline',
    });
  },

  async updateWellNuoBeneficiary(id: number, updates: Parameters<typeof api.updateWellNuoBeneficiary>[1]) {
    return withOfflineCheck(() => api.updateWellNuoBeneficiary(id, updates), {
      offlineMessage: 'Cannot update beneficiary while offline',
    });
  },

  async updateBeneficiaryAvatar(id: number, imageUri: string | null) {
    return withOfflineCheck(() => api.updateBeneficiaryAvatar(id, imageUri), {
      offlineMessage: 'Cannot upload avatar while offline',
    });
  },

  async updateBeneficiaryCustomName(id: number, customName: string | null) {
    return withOfflineCheck(() => api.updateBeneficiaryCustomName(id, customName), {
      offlineMessage: 'Cannot update name while offline',
    });
  },

  async deleteBeneficiary(id: number) {
    return withOfflineCheck(() => api.deleteBeneficiary(id), {
      offlineMessage: 'Cannot remove beneficiary while offline',
    });
  },

  // ==================== Devices / Sensors ====================

  async getDevicesForBeneficiary(beneficiaryId: string) {
    return withOfflineCheck(() => api.getDevicesForBeneficiary(beneficiaryId), {
      retry: true,
    });
  },

  async attachDeviceToBeneficiary(beneficiaryId: string, wellId: number, deviceMac: string) {
    return withOfflineCheck(() => api.attachDeviceToBeneficiary(beneficiaryId, wellId, deviceMac), {
      offlineMessage: 'Cannot attach sensor while offline',
    });
  },

  async updateDeviceMetadata(deviceId: string, updates: Parameters<typeof api.updateDeviceMetadata>[1]) {
    return withOfflineCheck(() => api.updateDeviceMetadata(deviceId, updates), {
      offlineMessage: 'Cannot update sensor settings while offline',
    });
  },

  async detachDeviceFromBeneficiary(beneficiaryId: string, deviceId: string) {
    return withOfflineCheck(() => api.detachDeviceFromBeneficiary(beneficiaryId, deviceId), {
      offlineMessage: 'Cannot remove sensor while offline',
    });
  },

  async getSensorHealthHistory(deviceId: string, timeRange: '24h' | '7d' | '30d' = '24h') {
    return withOfflineCheck(() => api.getSensorHealthHistory(deviceId, timeRange), {
      retry: true,
    });
  },

  // ==================== Subscriptions ====================

  async cancelSubscription(beneficiaryId: number) {
    return withOfflineCheck(() => api.cancelSubscription(beneficiaryId), {
      offlineMessage: 'Cannot cancel subscription while offline',
    });
  },

  async reactivateSubscription(beneficiaryId: number) {
    return withOfflineCheck(() => api.reactivateSubscription(beneficiaryId), {
      offlineMessage: 'Cannot reactivate subscription while offline',
    });
  },

  async getTransactionHistory(beneficiaryId: number, limit = 10) {
    return withOfflineCheck(() => api.getTransactionHistory(beneficiaryId, limit), {
      retry: true,
    });
  },

  // ==================== Invitations ====================

  async sendInvitation(params: Parameters<typeof api.sendInvitation>[0]) {
    return withOfflineCheck(() => api.sendInvitation(params), {
      offlineMessage: 'Cannot send invitation while offline',
    });
  },

  async getInvitations(beneficiaryId: string) {
    return withOfflineCheck(() => api.getInvitations(beneficiaryId), {
      retry: true,
    });
  },

  async deleteInvitation(invitationId: string) {
    return withOfflineCheck(() => api.deleteInvitation(invitationId), {
      offlineMessage: 'Cannot delete invitation while offline',
    });
  },

  async updateInvitation(invitationId: string, role: 'caretaker' | 'guardian') {
    return withOfflineCheck(() => api.updateInvitation(invitationId, role), {
      offlineMessage: 'Cannot update invitation while offline',
    });
  },

  async acceptInvitation(code: string) {
    return withOfflineCheck(() => api.acceptInvitation(code), {
      offlineMessage: 'Cannot accept invitation while offline',
    });
  },

  // ==================== Notifications ====================

  async getNotificationSettings() {
    return withOfflineCheck(() => api.getNotificationSettings(), {
      retry: true,
    });
  },

  async updateNotificationSettings(settings: Parameters<typeof api.updateNotificationSettings>[0]) {
    return withOfflineCheck(() => api.updateNotificationSettings(settings), {
      offlineMessage: 'Cannot update notification settings while offline',
    });
  },

  async getNotificationHistory(options?: Parameters<typeof api.getNotificationHistory>[0]) {
    return withOfflineCheck(() => api.getNotificationHistory(options), {
      retry: true,
    });
  },

  // ==================== AI Chat (Legacy API) ====================

  async sendMessage(question: string, deploymentId: string) {
    return withOfflineCheck(() => api.sendMessage(question, deploymentId), {
      offlineMessage: 'Cannot send message while offline',
    });
  },

  // ==================== Equipment Activation ====================

  async activateBeneficiary(beneficiaryId: number, serialNumber: string) {
    return withOfflineCheck(() => api.activateBeneficiary(beneficiaryId, serialNumber), {
      offlineMessage: 'Cannot activate equipment while offline',
    });
  },

  async updateBeneficiaryEquipmentStatus(
    id: number,
    status: 'none' | 'ordered' | 'shipped' | 'delivered'
  ) {
    return withOfflineCheck(() => api.updateBeneficiaryEquipmentStatus(id, status), {
      offlineMessage: 'Cannot update equipment status while offline',
    });
  },
};

/**
 * Export utility functions
 */
export { isNetworkError as isOfflineError, getNetworkErrorMessage as getOfflineErrorMessage };