import type { ApiError, ApiResponse, AuthResponse, Beneficiary, BeneficiaryDashboardData, ChatResponse, DashboardSingleResponse, NotificationSettings, WPSensor } from '@/types';
import { File } from 'expo-file-system';
import * as SecureStore from 'expo-secure-store';
import AsyncStorage from '@react-native-async-storage/async-storage';
import 'react-native-get-random-values'; // Polyfill for crypto.getRandomValues

// Callback for handling unauthorized responses (401)
let onUnauthorizedCallback: (() => void) | null = null;

export function setOnUnauthorizedCallback(callback: () => void) {
  onUnauthorizedCallback = callback;
}

const API_BASE_URL = 'https://eluxnetworks.net/function/well-api/api';
const CLIENT_ID = 'MA_001';

// WellNuo Backend API (our own API for auth, OTP, etc.)
// TODO: Update to production URL when deployed
const WELLNUO_API_URL = 'https://wellnuo.smartlaunchhub.com/api';

// Avatar images for elderly beneficiaries - grandmothers (бабушки)
const ELDERLY_AVATARS = [
  'https://images.unsplash.com/photo-1566616213894-2d4e1baee5d8?w=200&h=200&fit=crop&crop=face', // grandmother with gray hair
  'https://images.unsplash.com/photo-1544027993-37dbfe43562a?w=200&h=200&fit=crop&crop=face', // elderly woman smiling
  'https://images.unsplash.com/photo-1491308056676-205b7c9a7dc1?w=200&h=200&fit=crop&crop=face', // senior woman portrait
  'https://images.unsplash.com/photo-1580489944761-15a19d654956?w=200&h=200&fit=crop&crop=face', // older woman glasses
  'https://images.unsplash.com/photo-1548142813-c348350df52b?w=200&h=200&fit=crop&crop=face', // grandmother portrait
];

// Room locations for sensor placement
// Used in device settings to select where sensor is installed
export const ROOM_LOCATIONS = [
  { id: 'bedroom', label: 'Bedroom', icon: '🛏️', legacyCode: 102 },
  { id: 'living_room', label: 'Living Room', icon: '🛋️', legacyCode: 103 },
  { id: 'kitchen', label: 'Kitchen', icon: '🍳', legacyCode: 104 },
  { id: 'bathroom', label: 'Bathroom', icon: '🚿', legacyCode: 105 },
  { id: 'hallway', label: 'Hallway', icon: '🚪', legacyCode: 106 },
  { id: 'entrance', label: 'Entrance', icon: '🏠', legacyCode: 111 },
  { id: 'garage', label: 'Garage', icon: '🚗', legacyCode: 108 },
  { id: 'basement', label: 'Basement', icon: '🪜', legacyCode: 110 },
  { id: 'office', label: 'Office', icon: '💼', legacyCode: 107 },
  { id: 'other', label: 'Other', icon: '📍', legacyCode: 200 },
] as const;

export type RoomLocationId = typeof ROOM_LOCATIONS[number]['id'];

// Helper to convert location ID to Legacy API code
function getLocationLegacyCode(locationId: string): number | undefined {
  const location = ROOM_LOCATIONS.find(loc => loc.id === locationId);
  return location?.legacyCode;
}

// Helper to convert Legacy API code to location ID
export function getLocationIdFromCode(code: number): RoomLocationId | undefined {
  const location = ROOM_LOCATIONS.find(loc => loc.legacyCode === code);
  return location?.id;
}

// Get consistent avatar based on deployment_id
function getAvatarForBeneficiary(deploymentId: number): string {
  const index = deploymentId % ELDERLY_AVATARS.length;
  return ELDERLY_AVATARS[index];
}

// Helper function to format time ago
function formatTimeAgo(date: Date): string {
  const now = new Date();
  const diffMs = now.getTime() - date.getTime();
  const diffMins = Math.floor(diffMs / 60000);
  const diffHours = Math.floor(diffMins / 60);
  const diffDays = Math.floor(diffHours / 24);

  if (diffMins < 1) return 'Just now';
  if (diffMins < 60) return `${diffMins} min ago`;
  if (diffHours < 24) return `${diffHours} hour${diffHours > 1 ? 's' : ''} ago`;
  return `${diffDays} day${diffDays > 1 ? 's' : ''} ago`;
}

class ApiService {
  // API URLs as instance properties for consistency
  private readonly baseUrl = WELLNUO_API_URL;
  private readonly legacyApiUrl = API_BASE_URL;

  // Public method to get the access token (used by AuthContext)
  async getToken(): Promise<string | null> {
    try {
      return await SecureStore.getItemAsync('accessToken');
    } catch {
      return null;
    }
  }

  // Get legacy API token (for eluxnetworks.net API - dashboard, voice_ask)
  private async getLegacyToken(): Promise<string | null> {
    try {
      return await SecureStore.getItemAsync('legacyAccessToken');
    } catch {
      return null;
    }
  }

  private generateNonce(): string {
    // Use Web Crypto API (polyfilled by react-native-get-random-values)
    const randomBytes = new Uint8Array(16);
    crypto.getRandomValues(randomBytes);
    return Array.from(randomBytes)
      .map(b => b.toString(16).padStart(2, '0'))
      .join('');
  }

  private async makeRequest<T>(params: Record<string, string>): Promise<ApiResponse<T>> {
    try {
      const formData = new URLSearchParams();
      Object.entries(params).forEach(([key, value]) => {
        formData.append(key, value);
      });

      const response = await fetch(API_BASE_URL, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: formData.toString(),
      });

      const data = await response.json();

      // Handle 401 Unauthorized - trigger logout
      if (response.status === 401 || data.status === '401' || data.error === 'Unauthorized') {
        if (onUnauthorizedCallback) {
          onUnauthorizedCallback();
        }
        return {
          ok: false,
          error: {
            message: 'Session expired. Please login again.',
            code: 'UNAUTHORIZED',
            status: 401,
          },
        };
      }

      if (data.status === '200 OK' || data.ok === true) {
        return { data: data as T, ok: true };
      }

      return {
        ok: false,
        error: {
          message: data.message || data.error || 'Request failed',
          status: response.status,
        },
      };
    } catch (error) {
      const apiError: ApiError = {
        message: error instanceof Error ? error.message : 'Network error',
        code: 'NETWORK_ERROR',
      };
      return { ok: false, error: apiError };
    }
  }

  // Authentication (Legacy API - eluxnetworks.net)
  // Used for dev mode and dashboard access
  async login(username: string, password: string): Promise<ApiResponse<AuthResponse>> {
    const response = await this.makeRequest<AuthResponse>({
      function: 'credentials',
      email: username,
      ps: password,
      clientId: CLIENT_ID,
      nonce: this.generateNonce(),
    });

    if (response.ok && response.data) {
      // Save LEGACY credentials separately (not to accessToken!)
      // accessToken is reserved for WellNuo API JWT tokens
      await SecureStore.setItemAsync('legacyAccessToken', response.data.access_token);
      // Keep these for backward compatibility
      await SecureStore.setItemAsync('userId', response.data.user_id.toString());
      await SecureStore.setItemAsync('privileges', response.data.privileges);
      await SecureStore.setItemAsync('maxRole', response.data.max_role.toString());
    }

    return response;
  }

  async logout(): Promise<void> {
    // Clear WellNuo API auth data
    await SecureStore.deleteItemAsync('accessToken');
    await SecureStore.deleteItemAsync('userId');
    await SecureStore.deleteItemAsync('userEmail');
    await SecureStore.deleteItemAsync('onboardingCompleted');
    // Clear legacy API auth data
    await SecureStore.deleteItemAsync('legacyAccessToken');
    await SecureStore.deleteItemAsync('privileges');
    await SecureStore.deleteItemAsync('maxRole');
    // Clear user profile data (avatar, etc.)
    await SecureStore.deleteItemAsync('userAvatar');
    // Clear local cached data (beneficiaries, etc.)
    await AsyncStorage.removeItem('wellnuo_local_beneficiaries');
  }

  // Save user email (for OTP auth flow)
  async saveEmail(email: string): Promise<void> {
    await SecureStore.setItemAsync('userEmail', email);
  }

  // Get stored email
  async getStoredEmail(): Promise<string | null> {
    try {
      return await SecureStore.getItemAsync('userEmail');
    } catch {
      return null;
    }
  }

  // Onboarding completion flag - persists across app restarts
  async setOnboardingCompleted(completed: boolean): Promise<void> {
    await SecureStore.setItemAsync('onboardingCompleted', completed ? '1' : '0');
  }

  async isOnboardingCompleted(): Promise<boolean> {
    try {
      const value = await SecureStore.getItemAsync('onboardingCompleted');
      return value === '1';
    } catch {
      return false;
    }
  }

  // Save mock user (for dev mode OTP flow)
  async saveMockUser(user: { user_id: string; email: string; max_role: string; privileges: string[] }): Promise<void> {
    await SecureStore.setItemAsync('accessToken', `mock-token-${user.user_id}`);
    await SecureStore.setItemAsync('userId', user.user_id);
    await SecureStore.setItemAsync('privileges', user.privileges.join(','));
    await SecureStore.setItemAsync('maxRole', user.max_role);
    await SecureStore.setItemAsync('userEmail', user.email);
  }

  // ==================== OTP Authentication (WellNuo Backend) ====================

  // Check if email exists in database
  async checkEmail(email: string): Promise<ApiResponse<{ exists: boolean; name?: string | null }>> {
    try {
      const response = await fetch(`${WELLNUO_API_URL}/auth/check-email`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ email }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to check email' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Request OTP code - sends email via Brevo
  async requestOTP(email: string): Promise<ApiResponse<{ message: string }>> {
    try {
      const response = await fetch(`${WELLNUO_API_URL}/auth/request-otp`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ email }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to send OTP' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Verify OTP code and get JWT token
  async verifyOTP(email: string, code: string): Promise<ApiResponse<{ token: string; user: { id: string; email: string; first_name?: string; last_name?: string } }>> {
    try {
      const payload = { email: email.trim().toLowerCase(), code };

      const response = await fetch(`${WELLNUO_API_URL}/auth/verify-otp`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(payload),
      });

      const data = await response.json();

      if (response.ok && data.token) {
        // Save ONLY technical auth data (token, userId, email)
        // User profile data is fetched from API, NOT stored locally
        await SecureStore.setItemAsync('accessToken', data.token);
        await SecureStore.setItemAsync('userId', String(data.user.id));
        await SecureStore.setItemAsync('userEmail', email);

        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || data.message || 'Invalid or expired code' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  async isAuthenticated(): Promise<boolean> {
    const token = await this.getToken();
    return !!token;
  }

  // Get current user profile from API (not local storage!)
  async getStoredUser() {
    try {
      const token = await this.getToken();
      const userId = await SecureStore.getItemAsync('userId');

      if (!token || !userId) {
        return null;
      }

      // Fetch profile from server
      const profile = await this.getProfile();

      if (!profile.ok || !profile.data) {
        // If token is invalid (401), clear all tokens and return null
        // This will trigger re-authentication
        if (profile.error?.code === 'UNAUTHORIZED') {
          await this.logout();
          return null;
        }

        // For network errors OR other API errors, fall back to minimal info
        // We don't want to log out the user just because the server is temporarily unavailable
        const email = await SecureStore.getItemAsync('userEmail');
        return {
          user_id: parseInt(userId, 10),
          email: email || undefined,
          privileges: '',
          max_role: 0,
        };
      }

      // /auth/me returns { user: {...}, beneficiaries: [...] }
      // Extract user data from nested 'user' object
      const userData = profile.data.user || profile.data;

      return {
        user_id: userData.id,
        email: userData.email,
        firstName: userData.firstName,
        lastName: userData.lastName,
        phone: userData.phone,
        privileges: '',
        max_role: 0,
      };
    } catch (error) {
      // On any unexpected error, fall back to local data instead of logging out
      const userId = await SecureStore.getItemAsync('userId');
      const email = await SecureStore.getItemAsync('userEmail');
      if (userId) {
        return {
          user_id: parseInt(userId, 10),
          email: email || undefined,
          privileges: '',
          max_role: 0,
        };
      }
      return null;
    }
  }

  // Get user profile from WellNuo API
  // Note: /auth/me can return { user: {...}, beneficiaries: [...] } or just { id, email, ... }
  async getProfile(): Promise<ApiResponse<{
    id: number;
    email: string;
    firstName: string | null;
    lastName: string | null;
    phone: string | null;
    address: {
      street: string | null;
      city: string | null;
      zip: string | null;
      state: string | null;
      country: string | null;
    };
    createdAt: string;
    user?: {
      id: number;
      email: string;
      firstName: string | null;
      lastName: string | null;
      phone: string | null;
    };
  }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/auth/me`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (!response.ok) {
        return {
          ok: false,
          error: {
            message: data.error || 'Failed to get profile',
            code: response.status === 401 ? 'UNAUTHORIZED' : 'API_ERROR',
          }
        };
      }

      return { data, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Update user profile on WellNuo API
  async updateProfile(updates: {
    firstName?: string;
    lastName?: string;
    phone?: string;
    address?: {
      street?: string;
      city?: string;
      zip?: string;
      state?: string;
      country?: string;
    };
  }): Promise<ApiResponse<{ id: number; email: string; firstName: string | null; lastName: string | null; phone: string | null }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/auth/profile`, {
        method: 'PATCH',
        headers: {
          'Authorization': `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(updates),
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to update profile' } };
      }

      return { data, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Update user profile avatar on WellNuo API
  async updateProfileAvatar(imageUri: string | null): Promise<ApiResponse<{ id: string; avatarUrl: string | null }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      let avatarData: string | null = null;

      if (imageUri) {
        // Read image as base64 using new expo-file-system v19+ File API
        const file = new File(imageUri);
        const base64Data = await file.base64();

        // Determine MIME type from URI
        const extension = imageUri.split('.').pop()?.toLowerCase() || 'jpeg';
        const mimeType = extension === 'png' ? 'image/png' : 'image/jpeg';

        avatarData = `data:${mimeType};base64,${base64Data}`;
      }

      const response = await fetch(`${WELLNUO_API_URL}/auth/avatar`, {
        method: 'PATCH',
        headers: {
          'Authorization': `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ avatar: avatarData }),
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to update avatar' } };
      }

      return { data: data.user, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Beneficiaries (elderly people being monitored)
  async getBeneficiaries(): Promise<ApiResponse<{ beneficiaries: Beneficiary[] }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    // Note: Using mock data since API structure is not fully documented
    // Replace with actual API call when available
    const mockBeneficiaries: Beneficiary[] = [
      {
        id: 1,
        name: 'Julia Smith',
        displayName: 'Julia Smith',
        status: 'online',
        relationship: 'Mother',
        last_activity: '2 min ago',
        sensor_data: {
          motion_detected: true,
          last_motion: '2 min ago',
          door_status: 'closed',
          temperature: 22,
          humidity: 45,
        },
      },
      {
        id: 2,
        name: 'Robert Johnson',
        displayName: 'Robert Johnson',
        status: 'offline',
        relationship: 'Father',
        last_activity: '1 hour ago',
        sensor_data: {
          motion_detected: false,
          last_motion: '1 hour ago',
          door_status: 'closed',
          temperature: 21,
          humidity: 50,
        },
      },
    ];

    return { data: { beneficiaries: mockBeneficiaries }, ok: true };
  }

  async getBeneficiary(id: number): Promise<ApiResponse<Beneficiary>> {
    // Use real API data via getBeneficiaryDashboard
    const response = await this.getBeneficiaryDashboard(id.toString());

    if (!response.ok || !response.data) {
      return { ok: false, error: response.error || { message: 'Beneficiary not found', code: 'NOT_FOUND' } };
    }

    const data = response.data;
    // Determine if beneficiary is "online" based on last_detected_time
    const lastDetected = data.last_detected_time ? new Date(data.last_detected_time) : null;
    const isRecent = lastDetected && (Date.now() - lastDetected.getTime()) < 30 * 60 * 1000; // 30 min

    const deploymentId = parseInt(data.deployment_id, 10);
    const beneficiary: Beneficiary = {
      id: deploymentId,
      name: data.name,
      displayName: data.name, // For UI display
      avatar: getAvatarForBeneficiary(deploymentId),
      status: isRecent ? 'online' : 'offline',
      address: data.address,
      timezone: data.time_zone,
      wellness_score: data.wellness_score_percent,
      wellness_descriptor: data.wellness_descriptor,
      last_location: data.last_location,
      temperature: data.temperature,
      units: data.units,
      sleep_hours: data.sleep_hours,
      bedroom_temperature: data.bedroom_temperature,
      before_last_location: data.before_last_location,
      last_detected_time: data.last_detected_time,
      last_activity: data.last_detected_time
        ? formatTimeAgo(new Date(data.last_detected_time))
        : undefined,
    };

    return { data: beneficiary, ok: true };
  }

  // Get beneficiary dashboard data by deployment_id (LEGACY API - eluxnetworks.net)
  async getBeneficiaryDashboard(deploymentId: string): Promise<ApiResponse<BeneficiaryDashboardData>> {
    // Use legacy API credentials for dashboard
    const token = await this.getLegacyToken();

    if (!token) {
      // Fallback to regular credentials if legacy not available
      const fallbackToken = await this.getToken();
      if (!fallbackToken) {
        return { ok: false, error: { message: 'Not authenticated for dashboard access', code: 'UNAUTHORIZED' } };
      }
      // Note: This will likely fail if using WellNuo token, but we try anyway
    }

    const today = new Date().toISOString().split('T')[0]; // YYYY-MM-DD

    const response = await this.makeRequest<DashboardSingleResponse>({
      function: 'dashboard_single',
      token: token || await this.getToken() || '',
      deployment_id: deploymentId,
      date: today,
      nonce: this.generateNonce(),
    });

    if (response.ok && response.data?.result_list?.[0]) {
      return { data: response.data.result_list[0], ok: true };
    }

    return {
      ok: false,
      error: response.error || { message: 'Failed to get beneficiary data' },
    };
  }

  // Get all beneficiaries from WellNuo API
  async getAllBeneficiaries(): Promise<ApiResponse<Beneficiary[]>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (!response.ok) {
        if (response.status === 401) {
          if (onUnauthorizedCallback) onUnauthorizedCallback();
          return { ok: false, error: { message: 'Session expired', code: 'UNAUTHORIZED', status: 401 } };
        }
        return { ok: false, error: { message: data.error || 'Failed to get beneficiaries' } };
      }

      // Map API response to Beneficiary type
      const beneficiaries: Beneficiary[] = (data.beneficiaries || []).map((item: any) => ({
        id: item.id,
        name: item.originalName || item.name || item.email, // Original name from server
        customName: item.customName || null, // User's custom name for this beneficiary
        displayName: item.displayName || item.customName || item.name || item.email, // Server-provided displayName
        originalName: item.originalName || item.name, // Original name from beneficiaries table
        avatar: item.avatarUrl || undefined, // Use uploaded avatar from server
        status: 'offline' as const,
        email: item.email,
        address: typeof item.address === 'string' ? item.address : (item.address?.street ? `${item.address.street}, ${item.address.city}` : undefined),
        subscription: item.subscription,
        // Equipment status from orders
        equipmentStatus: item.equipmentStatus,
        hasDevices: item.hasDevices || false,
        trackingNumber: item.trackingNumber,
        role: item.role, // User's role for this beneficiary (custodian, guardian, caretaker)
      }));

      return { data: beneficiaries, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Get single beneficiary details from WellNuo API
  async getWellNuoBeneficiary(id: number): Promise<ApiResponse<Beneficiary>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${id}`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to get beneficiary' } };
      }

      const beneficiary: Beneficiary = {
        id: data.id,
        name: data.originalName || data.name || data.email, // Original name from server
        customName: data.customName || null, // User's custom name for this beneficiary
        displayName: data.displayName || data.customName || data.name || data.email, // Server-provided displayName
        originalName: data.originalName || data.name, // Original name from beneficiaries table
        avatar: data.avatarUrl || undefined,
        status: 'offline' as const,
        email: data.email,
        address: typeof data.address === 'string' ? data.address : (data.address?.street ? `${data.address.street}, ${data.address.city}` : undefined),
        subscription: data.subscription ? {
          status: data.subscription.status,
          planType: data.subscription.planType || data.subscription.plan,
          endDate: data.subscription.endDate,
          cancelAtPeriodEnd: data.subscription.cancelAtPeriodEnd,
        } : undefined,
        // Equipment status from orders
        equipmentStatus: data.equipmentStatus,
        hasDevices: data.hasDevices || false,
        trackingNumber: data.trackingNumber,
        // User's role for this beneficiary (custodian, guardian, caretaker)
        role: data.role,
      };

      return { data: beneficiary, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Update beneficiary in WellNuo API
  async updateWellNuoBeneficiary(id: number, updates: {
    name?: string;
    phone?: string;
    address?: string;
  }): Promise<ApiResponse<Beneficiary>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${id}`, {
        method: 'PATCH',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify(updates),
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to update beneficiary' } };
      }

      const beneficiary: Beneficiary = {
        id: data.beneficiary.id,
        name: data.beneficiary.name || data.beneficiary.email,
        displayName: data.beneficiary.displayName || data.beneficiary.name || data.beneficiary.email,
        email: data.beneficiary.email,
        status: 'offline' as const,
      };

      return { data: beneficiary, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Create new beneficiary (grants owner access automatically)
  async createBeneficiary(data: {
    name: string;
    phone?: string;
    address?: string;
  }): Promise<ApiResponse<Beneficiary>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify(data),
      });

      const result = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: result.error || 'Failed to create beneficiary' } };
      }

      const beneficiary: Beneficiary = {
        id: result.beneficiary.id,
        name: result.beneficiary.name || '',
        displayName: result.beneficiary.name || '', // For UI display
        status: 'offline' as const,
      };

      return { data: beneficiary, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Upload/update beneficiary avatar
  async updateBeneficiaryAvatar(id: number, imageUri: string | null): Promise<ApiResponse<{ avatarUrl: string | null }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      let base64Image: string | null = null;

      if (imageUri) {
        // Read file as base64 using new expo-file-system v19+ File API
        const file = new File(imageUri);
        const base64Data = await file.base64();

        // Determine mime type from URI extension
        const extension = imageUri.split('.').pop()?.toLowerCase() || 'jpeg';
        const mimeType = extension === 'png' ? 'image/png' : 'image/jpeg';

        // Create data URI
        base64Image = `data:${mimeType};base64,${base64Data}`;

      }

      const apiResponse = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${id}/avatar`, {
        method: 'PATCH',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ avatar: base64Image }),
      });

      const data = await apiResponse.json();

      if (!apiResponse.ok) {
        return { ok: false, error: { message: data.error || 'Failed to update avatar' } };
      }

      return { data: { avatarUrl: data.beneficiary?.avatarUrl || null }, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Delete beneficiary (removes access record)
  async deleteBeneficiary(id: number): Promise<ApiResponse<{ success: boolean }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${id}`, {
        method: 'DELETE',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to delete beneficiary' } };
      }

      return { data: { success: true }, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Update beneficiary equipment status
  async updateBeneficiaryEquipmentStatus(
    id: number,
    status: 'none' | 'ordered' | 'shipped' | 'delivered'
  ): Promise<ApiResponse<{ success: boolean }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${id}/equipment-status`, {
        method: 'PATCH',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ status }),
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to update equipment status' } };
      }

      return { data: { success: true }, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // Update beneficiary custom name (per-user, stored in user_access)
  async updateBeneficiaryCustomName(
    id: number,
    customName: string | null
  ): Promise<ApiResponse<{ customName: string | null }>> {
    const token = await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${id}/custom-name`, {
        method: 'PATCH',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ customName }),
      });

      const data = await response.json();

      if (!response.ok) {
        return { ok: false, error: { message: data.error || 'Failed to update custom name' } };
      }

      return { data: { customName: data.customName }, ok: true };
    } catch (error) {
      return { ok: false, error: { message: 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  // AI Chat - deploymentId is required, no default value for security (LEGACY API)
  async sendMessage(question: string, deploymentId: string): Promise<ApiResponse<ChatResponse>> {
    if (!deploymentId) {
      return { ok: false, error: { message: 'Please select a beneficiary first', code: 'NO_BENEFICIARY_SELECTED' } };
    }
    // Use legacy API credentials for voice_ask
    const token = await this.getLegacyToken() || await this.getToken();

    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    return this.makeRequest<ChatResponse>({
      function: 'voice_ask',
      clientId: CLIENT_ID,
      token: token,
      question: question,
      deployment_id: deploymentId,
    });
  }

  // ==================== Invitations API ====================

  // Send invitation to share access to a beneficiary
  async sendInvitation(params: {
    beneficiaryId: string;
    email: string;
    role: 'caretaker' | 'guardian';
    label?: string;
  }): Promise<ApiResponse<{ invitation: { id: string; status: string } }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/invitations`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({
          beneficiaryId: params.beneficiaryId,
          email: params.email,
          role: params.role, // Backend expects 'caretaker' or 'guardian'
          label: params.label,
        }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to send invitation' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Get invitations for a beneficiary
  async getInvitations(beneficiaryId: string): Promise<ApiResponse<{
    invitations: Array<{
      id: string;
      email: string;
      role: string;
      label?: string;
      status: string;
      created_at: string;
    }>
  }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/invitations/beneficiary/${beneficiaryId}`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to get invitations' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Delete invitation
  async deleteInvitation(invitationId: string): Promise<ApiResponse<{ success: boolean }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/invitations/${invitationId}`, {
        method: 'DELETE',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to delete invitation' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Accept invitation code
  async acceptInvitation(code: string): Promise<ApiResponse<{
    success: boolean;
    message: string;
    beneficiary?: {
      id: number;
      firstName: string | null;
      lastName: string | null;
      email: string | null;
    };
    role?: string;
  }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/invitations/accept`, {
        method: 'POST',
        headers: {
          'Authorization': `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ code }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to accept invitation' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Activate equipment for beneficiary (saves to server)
  async activateBeneficiary(beneficiaryId: number, serialNumber: string): Promise<ApiResponse<{
    success: boolean;
    beneficiary: {
      id: number;
      firstName: string | null;
      lastName: string | null;
      hasDevices: boolean;
      equipmentStatus: string;
      device_id: string;
    };
  }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/me/beneficiaries/${beneficiaryId}/activate`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ serialNumber }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to activate equipment' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // ==================== SUBSCRIPTION MANAGEMENT ====================

  // Cancel subscription at period end
  async cancelSubscription(beneficiaryId: number): Promise<ApiResponse<{ success: boolean; cancelAt: string }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/stripe/cancel-subscription`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ beneficiaryId }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to cancel subscription' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Get transaction history from Stripe
  async getTransactionHistory(beneficiaryId: number, limit = 10): Promise<ApiResponse<{
    transactions: Array<{
      id: string;
      type: 'subscription' | 'one_time';
      amount: number;
      currency: string;
      status: string;
      date: string;
      description: string;
      invoicePdf?: string;
      hostedUrl?: string;
      receiptUrl?: string;
    }>;
    hasMore: boolean;
  }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/stripe/transaction-history/${beneficiaryId}?limit=${limit}`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to get transaction history' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Reactivate subscription that was set to cancel
  async reactivateSubscription(beneficiaryId: number): Promise<ApiResponse<{ success: boolean; status: string }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/stripe/reactivate-subscription`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ beneficiaryId }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to reactivate subscription' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Update invitation role
  async updateInvitation(invitationId: string, role: 'caretaker' | 'guardian'): Promise<ApiResponse<{ success: boolean; invitation: { id: string; role: string; email: string } }>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/invitations/${invitationId}`, {
        method: 'PATCH',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify({ role }),
      });

      const data = await response.json();

      if (response.ok) {
        return { data, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to update invitation' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // ==================== NOTIFICATION SETTINGS ====================

  // Get notification settings for current user
  async getNotificationSettings(): Promise<ApiResponse<NotificationSettings>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/notification-settings`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      const data = await response.json();

      if (response.ok) {
        return { data: data.settings, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to get notification settings' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // Update notification settings for current user
  async updateNotificationSettings(settings: Partial<NotificationSettings>): Promise<ApiResponse<NotificationSettings>> {
    const token = await this.getToken();
    if (!token) {
      return { ok: false, error: { message: 'Not authenticated', code: 'UNAUTHORIZED' } };
    }

    try {
      const response = await fetch(`${WELLNUO_API_URL}/notification-settings`, {
        method: 'PATCH',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify(settings),
      });

      const data = await response.json();

      if (response.ok) {
        return { data: data.settings, ok: true };
      }

      return {
        ok: false,
        error: { message: data.error || 'Failed to update notification settings' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Network error. Please check your connection.' },
      };
    }
  }

  // ==========================================
  // Legacy Dashboard Methods (Developer Mode)
  // For eluxnetworks.net dashboard WebView
  // ==========================================

  // Demo credentials for legacy dashboard
  private readonly DEMO_LEGACY_USER = 'anandk';
  private readonly DEMO_LEGACY_PASSWORD = 'anandk_8';
  private readonly DEMO_DEPLOYMENT_ID = 21; // Ferdinand's deployment

  // Login to legacy dashboard API
  async loginToLegacyDashboard(): Promise<ApiResponse<AuthResponse>> {
    try {
      const formData = new URLSearchParams();
      formData.append('function', 'credentials');
      formData.append('user_name', this.DEMO_LEGACY_USER);
      formData.append('ps', this.DEMO_LEGACY_PASSWORD);
      formData.append('clientId', CLIENT_ID);
      formData.append('nonce', this.generateNonce());

      const response = await fetch(API_BASE_URL, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: formData.toString(),
      });

      const data = await response.json();

      // Check that access_token is a valid JWT string (not 0 or empty)
      if (data.status === '200 OK' && data.access_token && typeof data.access_token === 'string' && data.access_token.includes('.')) {
        // Save legacy credentials
        await SecureStore.setItemAsync('legacyAccessToken', data.access_token);
        await SecureStore.setItemAsync('legacyUserId', String(data.user_id));
        await SecureStore.setItemAsync('legacyUserName', this.DEMO_LEGACY_USER);

        return { data: data as AuthResponse, ok: true };
      }
      return {
        ok: false,
        error: { message: data.message || 'Legacy login failed - invalid credentials' },
      };
    } catch (error) {
      return {
        ok: false,
        error: { message: 'Failed to connect to dashboard API' },
      };
    }
  }

  // Refresh legacy token
  async refreshLegacyToken(): Promise<ApiResponse<AuthResponse>> {
    return this.loginToLegacyDashboard();
  }

  // Check if legacy token is expiring soon (within 1 hour)
  async isLegacyTokenExpiringSoon(): Promise<boolean> {
    try {
      const token = await this.getLegacyToken();
      if (!token) return true;

      // Decode JWT to get expiration
      const parts = token.split('.');
      if (parts.length !== 3) return true;

      const payload = JSON.parse(atob(parts[1]));
      const exp = payload.exp;
      if (!exp) return true;

      const now = Math.floor(Date.now() / 1000);
      const oneHour = 60 * 60;

      const isExpiring = (exp - now) < oneHour;
      return isExpiring;
    } catch (e) {
      return true;
    }
  }

  // Get legacy credentials for WebView injection
  async getLegacyWebViewCredentials(): Promise<{
    token: string;
    userName: string;
    userId: string;
  } | null> {
    try {
      const token = await SecureStore.getItemAsync('legacyAccessToken');
      const userName = await SecureStore.getItemAsync('legacyUserName');
      const userId = await SecureStore.getItemAsync('legacyUserId');

      // Check if credentials exist AND token is valid JWT (contains dots)
      const isValidToken = token && typeof token === 'string' && token.includes('.');

      if (!isValidToken || !userName || !userId) {
        // Clear any invalid cached credentials
        if (token && !isValidToken) {
          await SecureStore.deleteItemAsync('legacyAccessToken');
          await SecureStore.deleteItemAsync('legacyUserName');
          await SecureStore.deleteItemAsync('legacyUserId');
        }

        const loginResult = await this.loginToLegacyDashboard();
        if (!loginResult.ok) return null;

        // Get freshly saved credentials
        const newToken = await SecureStore.getItemAsync('legacyAccessToken');
        const newUserName = await SecureStore.getItemAsync('legacyUserName');
        const newUserId = await SecureStore.getItemAsync('legacyUserId');

        if (!newToken || !newUserName || !newUserId) return null;
        return { token: newToken, userName: newUserName, userId: newUserId };
      }

      return { token, userName, userId };
    } catch (e) {
      return null;
    }
  }

  // Get demo deployment ID
  getDemoDeploymentId(): number {
    return this.DEMO_DEPLOYMENT_ID;
  }

  /**
   * Get Legacy API credentials for device operations
   * Uses the same credentials as getLegacyWebViewCredentials but returns only what's needed
   */
  async getLegacyCredentials(): Promise<{ userName: string; token: string } | null> {
    const creds = await this.getLegacyWebViewCredentials();
    if (!creds) return null;
    return { userName: creds.userName, token: creds.token };
  }

  // ============================================================================
  // WP SENSORS / DEVICES MANAGEMENT
  // ============================================================================

  /**
   * Get all devices for a beneficiary
   * Returns WP sensors with online/offline status
   */
  async getDevicesForBeneficiary(beneficiaryId: string) {
    try {
      // Get auth token for WellNuo API
      const token = await this.getToken();
      if (!token) return { ok: false, error: 'Not authenticated' };

      // Get beneficiary's deployment_id from PostgreSQL
      const response = await fetch(`${this.baseUrl}/me/beneficiaries/${beneficiaryId}`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });
      if (!response.ok) throw new Error('Failed to get beneficiary');

      const beneficiary = await response.json();
      const deploymentId = beneficiary.deploymentId;

      if (!deploymentId) {
        return { ok: true, data: [] }; // No deployment = no devices
      }

      // Get Legacy API credentials
      const creds = await this.getLegacyCredentials();
      if (!creds) return { ok: false, error: 'Not authenticated with Legacy API' };

      // Get devices from Legacy API
      const formData = new URLSearchParams({
        function: 'device_list_by_deployment',
        user_name: creds.userName,
        token: creds.token,
        deployment_id: deploymentId.toString(),
        first: '0',
        last: '100',
      });

      const devicesResponse = await fetch(this.legacyApiUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: formData.toString(),
      });

      if (!devicesResponse.ok) {
        throw new Error('Failed to fetch devices from Legacy API');
      }

      const devicesData = await devicesResponse.json();

      if (!devicesData.result_list || devicesData.result_list.length === 0) {
        return { ok: true, data: [] };
      }

      // Get online status
      const onlineDevices = await this.getOnlineDevices(deploymentId);

      // Transform to WPSensor format with status calculation
      const sensors: WPSensor[] = devicesData.result_list.map((device: any) => {
        const [deviceId, wellId, mac, lastSeenTimestamp, location, description] = device;
        const lastSeen = new Date(lastSeenTimestamp * 1000);

        // Calculate status based on lastSeen time
        const now = new Date();
        const diffMinutes = (now.getTime() - lastSeen.getTime()) / (1000 * 60);

        let status: 'online' | 'warning' | 'offline';
        if (diffMinutes < 5) {
          status = 'online';   // 🟢 Fresh data
        } else if (diffMinutes < 60) {
          status = 'warning';  // 🟡 Might be issue
        } else {
          status = 'offline';  // 🔴 Definitely problem
        }

        // Convert numeric location code to string ID if needed
        let locationId = '';
        if (location) {
          const numericLocation = parseInt(location, 10);
          if (!isNaN(numericLocation)) {
            // It's a numeric code from Legacy API - convert to our ID
            locationId = getLocationIdFromCode(numericLocation) || '';
          } else {
            // It's already a string (legacy data or custom location)
            locationId = location;
          }
        }

        return {
          deviceId: deviceId.toString(),
          wellId: parseInt(wellId, 10),
          mac: mac,
          name: `WP_${wellId}_${mac.slice(-6).toLowerCase()}`,
          status: status,
          lastSeen: lastSeen,
          location: locationId,
          description: description || '',
          beneficiaryId: beneficiaryId,
          deploymentId: deploymentId,
          source: 'api', // From API = attached to beneficiary
        };
      });

      return { ok: true, data: sensors };
    } catch (error: any) {
      return { ok: false, error: error.message };
    }
  }

  /**
   * Get online devices for a deployment (using fresh=true)
   * Returns Set of device_ids that are online
   */
  private async getOnlineDevices(deploymentId: number): Promise<Set<number>> {
    try {
      const creds = await this.getLegacyCredentials();
      if (!creds) return new Set();

      const formData = new URLSearchParams({
        function: 'request_devices',
        user_name: creds.userName,
        token: creds.token,
        deployment_id: deploymentId.toString(),
        group_id: 'All',
        location: 'All',
        fresh: 'true', // Only online devices
      });

      const response = await fetch(this.legacyApiUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: formData.toString(),
      });

      if (!response.ok) return new Set();

      const data = await response.json();

      if (!data.result_list) return new Set();

      // Extract device_ids from result
      const deviceIds = data.result_list.map((device: any) => device[0]);
      return new Set(deviceIds);
    } catch (error) {
      return new Set();
    }
  }

  /**
   * Attach device to beneficiary's deployment
   */
  async attachDeviceToBeneficiary(
    beneficiaryId: string,
    wellId: number,
    ssid: string,
    password: string
  ) {
    try {
      // Get auth token for WellNuo API
      const token = await this.getToken();
      if (!token) throw new Error('Not authenticated');

      // Get beneficiary details
      const response = await fetch(`${this.baseUrl}/me/beneficiaries/${beneficiaryId}`, {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });
      if (!response.ok) throw new Error('Failed to get beneficiary');

      const beneficiary = await response.json();
      const deploymentId = beneficiary.deploymentId;

      if (!deploymentId) {
        throw new Error('Beneficiary has no deployment');
      }

      const creds = await this.getLegacyCredentials();
      if (!creds) throw new Error('Not authenticated with Legacy API');

      // Call set_deployment to attach device
      const formData = new URLSearchParams({
        function: 'set_deployment',
        user_name: creds.userName,
        token: creds.token,
        deployment: deploymentId.toString(),
        devices: JSON.stringify([wellId]),
        wifis: JSON.stringify([`${ssid}|${password}`]),
        reuse_existing_devices: '1',
      });

      const attachResponse = await fetch(this.legacyApiUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: formData.toString(),
      });

      if (!attachResponse.ok) {
        throw new Error('Failed to attach device');
      }

      const data = await attachResponse.json();

      if (data.status !== '200 OK') {
        throw new Error(data.message || 'Failed to attach device');
      }

      return { ok: true };
    } catch (error: any) {
      return { ok: false, error: error.message };
    }
  }

  /**
   * Update device metadata (location, description) in Legacy API
   * Uses device_form endpoint
   */
  async updateDeviceMetadata(
    deviceId: string,
    updates: {
      location?: string;  // Location ID (e.g., 'bedroom', 'kitchen') - will be converted to Legacy API code
      description?: string;
    }
  ): Promise<ApiResponse<{ success: boolean }>> {
    try {
      const creds = await this.getLegacyWebViewCredentials();
      if (!creds) {
        return { ok: false, error: { message: 'Not authenticated with Legacy API', code: 'UNAUTHORIZED' } };
      }

      const formData = new URLSearchParams({
        function: 'device_form',
        user_name: creds.userName,
        token: creds.token,
        device_id: deviceId,
      });

      // Add optional fields if provided
      // Location must be converted from ID to Legacy API numeric code
      if (updates.location !== undefined) {
        const legacyCode = getLocationLegacyCode(updates.location);
        if (legacyCode !== undefined) {
          formData.append('location', legacyCode.toString());
        } else {
          // If location ID not found, log warning but don't fail
          console.warn(`Unknown location ID: ${updates.location}, skipping location update`);
        }
      }
      if (updates.description !== undefined) {
        formData.append('description', updates.description);
      }

      const response = await fetch(API_BASE_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: formData.toString(),
      });

      if (!response.ok) {
        return { ok: false, error: { message: 'Failed to update device' } };
      }

      const data = await response.json();

      if (data.status !== '200 OK') {
        return { ok: false, error: { message: data.message || 'Failed to update device' } };
      }

      return { ok: true, data: { success: true } };
    } catch (error: any) {
      return { ok: false, error: { message: error.message || 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  /**
   * Attach device to deployment via Legacy API
   * Uses set_deployment endpoint to link a WP sensor to a beneficiary's deployment
   *
   * @param deploymentId - The deployment ID to attach the device to
   * @param wellId - The device's well_id (from BLE scan, e.g., 497)
   * @param ssid - WiFi network SSID
   * @param password - WiFi network password
   */
  async attachDeviceToDeployment(
    deploymentId: number,
    wellId: number,
    ssid: string,
    password: string
  ): Promise<ApiResponse<{ success: boolean }>> {
    try {
      const creds = await this.getLegacyWebViewCredentials();
      if (!creds) {
        return { ok: false, error: { message: 'Not authenticated with Legacy API', code: 'UNAUTHORIZED' } };
      }

      // Call set_deployment to attach device
      const formData = new URLSearchParams({
        function: 'set_deployment',
        user_name: creds.userName,
        token: creds.token,
        deployment: deploymentId.toString(),
        devices: JSON.stringify([wellId]),
        wifis: JSON.stringify([`${ssid}|${password}`]),
        reuse_existing_devices: '1',
      });

      const response = await fetch(API_BASE_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: formData.toString(),
      });

      if (!response.ok) {
        return { ok: false, error: { message: 'Failed to attach device to deployment' } };
      }

      const data = await response.json();

      if (data.status !== '200 OK') {
        return { ok: false, error: { message: data.message || 'Failed to attach device' } };
      }

      return { ok: true, data: { success: true } };
    } catch (error: any) {
      return { ok: false, error: { message: error.message || 'Network error', code: 'NETWORK_ERROR' } };
    }
  }

  /**
   * Detach device from beneficiary
   */
  async detachDeviceFromBeneficiary(beneficiaryId: string, deviceId: string) {
    try {
      const creds = await this.getLegacyCredentials();
      if (!creds) throw new Error('Not authenticated with Legacy API');

      // Set device's deployment to 0 (unassigned)
      const formData = new URLSearchParams({
        function: 'device_form',
        user_name: creds.userName,
        token: creds.token,
        device_id: deviceId,
        deployment_id: '0', // Unassign
      });

      const response = await fetch(this.legacyApiUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: formData.toString(),
      });

      if (!response.ok) throw new Error('Failed to detach device');

      return { ok: true };
    } catch (error: any) {
      return { ok: false, error: error.message };
    }
  }
}

export const api = new ApiService();