import { 
  Condo, Family, Payment, AppSettings, User, AuthResponse, 
  Ticket, TicketComment, ExtraordinaryExpense, Notice, 
  AlertDefinition, NoticeRead 
} from '../types';

const API_URL = '/api';

async function request<T>(endpoint: string, options: RequestInit = {}): Promise<T> {
  const token = localStorage.getItem('condo_token');
  const headers: HeadersInit = {
    'Content-Type': 'application/json',
    ...options.headers as any,
  };

  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const response = await fetch(`${API_URL}${endpoint}`, {
    ...options,
    headers,
  });

  if (!response.ok) {
    const errorText = await response.text();
    throw new Error(errorText || response.statusText);
  }

  // Handle empty responses
  const text = await response.text();
  return text ? JSON.parse(text) : undefined;
}

export const CondoService = {
  // Auth & User
  login: async (email: string, password: string): Promise<void> => {
      const data = await request<AuthResponse>('/auth/login', {
          method: 'POST',
          body: JSON.stringify({ email, password })
      });
      localStorage.setItem('condo_token', data.token);
      localStorage.setItem('condo_user', JSON.stringify(data.user));
  },

  logout: () => {
      localStorage.removeItem('condo_token');
      localStorage.removeItem('condo_user');
      window.location.href = '/#/login';
  },

  getCurrentUser: (): User | null => {
      const u = localStorage.getItem('condo_user');
      return u ? JSON.parse(u) : null;
  },

  updateProfile: async (data: any): Promise<void> => {
      const res = await request<{success: boolean, user: User}>('/profile', {
          method: 'PUT',
          body: JSON.stringify(data)
      });
      if (res.user) {
          localStorage.setItem('condo_user', JSON.stringify(res.user));
      }
  },

  // Settings
  getSettings: async (): Promise<AppSettings> => {
      return request<AppSettings>('/settings');
  },

  updateSettings: async (settings: AppSettings): Promise<void> => {
      return request('/settings', {
          method: 'PUT',
          body: JSON.stringify(settings)
      });
  },

  testSmtpConfig: async (config: any): Promise<void> => {
      return request('/settings/smtp-test', {
          method: 'POST',
          body: JSON.stringify(config)
      });
  },

  getAvailableYears: async (): Promise<number[]> => {
      return request<number[]>('/years');
  },

  // Condos
  getCondos: async (): Promise<Condo[]> => {
      return request<Condo[]>('/condos');
  },

  getActiveCondoId: (): string | undefined => {
      return localStorage.getItem('active_condo_id') || undefined;
  },

  getActiveCondo: async (): Promise<Condo | undefined> => {
      const id = localStorage.getItem('active_condo_id');
      const condos = await CondoService.getCondos();
      if (id) {
          return condos.find(c => c.id === id);
      }
      return condos.length > 0 ? condos[0] : undefined;
  },

  setActiveCondo: (id: string) => {
      localStorage.setItem('active_condo_id', id);
      window.dispatchEvent(new Event('condo-updated'));
      window.location.reload();
  },

  saveCondo: async (condo: Condo): Promise<Condo> => {
      if (condo.id) {
          await request(`/condos/${condo.id}`, {
              method: 'PUT',
              body: JSON.stringify(condo)
          });
          return condo;
      } else {
          return request<Condo>('/condos', {
              method: 'POST',
              body: JSON.stringify(condo)
          });
      }
  },

  deleteCondo: async (id: string): Promise<void> => {
      return request(`/condos/${id}`, { method: 'DELETE' });
  },

  // Families
  getFamilies: async (condoId?: string): Promise<Family[]> => {
      let url = '/families';
      const activeId = condoId || CondoService.getActiveCondoId();
      if (activeId) url += `?condoId=${activeId}`;
      return request<Family[]>(url);
  },

  addFamily: async (family: any): Promise<Family> => {
       const activeId = CondoService.getActiveCondoId();
       return request<Family>('/families', {
           method: 'POST',
           body: JSON.stringify({ ...family, condoId: activeId })
       });
  },

  updateFamily: async (family: Family): Promise<void> => {
      return request(`/families/${family.id}`, {
          method: 'PUT',
          body: JSON.stringify(family)
      });
  },

  deleteFamily: async (id: string): Promise<void> => {
      return request(`/families/${id}`, { method: 'DELETE' });
  },

  // Payments
  seedPayments: () => { /* No-op for real backend */ },

  getPaymentsByFamily: async (familyId: string): Promise<Payment[]> => {
      return request<Payment[]>(`/payments?familyId=${familyId}`);
  },

  getCondoPayments: async (condoId: string): Promise<Payment[]> => {
      return request<Payment[]>(`/payments?condoId=${condoId}`);
  },

  addPayment: async (payment: any): Promise<Payment> => {
      return request<Payment>('/payments', {
          method: 'POST',
          body: JSON.stringify(payment)
      });
  },

  // Users
  getUsers: async (condoId?: string): Promise<User[]> => {
      let url = '/users';
      if (condoId) url += `?condoId=${condoId}`;
      return request<User[]>(url);
  },

  createUser: async (user: any): Promise<void> => {
      return request('/users', {
          method: 'POST',
          body: JSON.stringify(user)
      });
  },

  updateUser: async (id: string, user: any): Promise<void> => {
      return request(`/users/${id}`, {
          method: 'PUT',
          body: JSON.stringify(user)
      });
  },

  deleteUser: async (id: string): Promise<void> => {
      return request(`/users/${id}`, { method: 'DELETE' });
  },

  // Alerts
  getAlerts: async (condoId?: string): Promise<AlertDefinition[]> => {
      let url = '/alerts';
      if (condoId) url += `?condoId=${condoId}`;
      return request<AlertDefinition[]>(url);
  },

  saveAlert: async (alert: AlertDefinition): Promise<AlertDefinition> => {
      const activeId = CondoService.getActiveCondoId();
      if (alert.id) {
          await request(`/alerts/${alert.id}`, { method: 'PUT', body: JSON.stringify(alert) });
          return alert;
      } else {
          return request('/alerts', { 
              method: 'POST', 
              body: JSON.stringify({ ...alert, condoId: activeId }) 
          });
      }
  },

  deleteAlert: async (id: string): Promise<void> => {
      return request(`/alerts/${id}`, { method: 'DELETE' });
  },

  // Notices
  getNotices: async (condoId?: string): Promise<Notice[]> => {
       let url = '/notices';
       const activeId = condoId || CondoService.getActiveCondoId();
       if (activeId) url += `?condoId=${activeId}`;
       return request<Notice[]>(url);
  },

  getUnreadNoticesForUser: async (userId: string, condoId: string): Promise<Notice[]> => {
       return request<Notice[]>(`/notices/unread?userId=${userId}&condoId=${condoId}`);
  },

  getNoticeReadStatus: async (noticeId: string): Promise<NoticeRead[]> => {
      return request<NoticeRead[]>(`/notices/${noticeId}/read-status`);
  },

  markNoticeAsRead: async (noticeId: string, userId: string): Promise<void> => {
      return request(`/notices/${noticeId}/read`, {
          method: 'POST',
          body: JSON.stringify({ userId })
      });
  },

  saveNotice: async (notice: Notice): Promise<void> => {
       if (notice.id) {
           return request(`/notices/${notice.id}`, { method: 'PUT', body: JSON.stringify(notice) });
       } else {
           return request('/notices', { method: 'POST', body: JSON.stringify(notice) });
       }
  },

  deleteNotice: async (id: string): Promise<void> => {
      return request(`/notices/${id}`, { method: 'DELETE' });
  },

  // Tickets
  getTickets: async (): Promise<Ticket[]> => {
      const activeId = CondoService.getActiveCondoId();
      return request<Ticket[]>(`/tickets?condoId=${activeId}`);
  },

  createTicket: async (data: any): Promise<void> => {
      const activeId = CondoService.getActiveCondoId();
      return request('/tickets', {
          method: 'POST',
          body: JSON.stringify({ ...data, condoId: activeId })
      });
  },

  updateTicket: async (id: string, data: any): Promise<void> => {
      return request(`/tickets/${id}`, {
          method: 'PUT',
          body: JSON.stringify(data)
      });
  },

  deleteTicket: async (id: string): Promise<void> => {
      return request(`/tickets/${id}`, { method: 'DELETE' });
  },

  getTicketComments: async (ticketId: string): Promise<TicketComment[]> => {
      return request<TicketComment[]>(`/tickets/${ticketId}/comments`);
  },

  addTicketComment: async (ticketId: string, text: string): Promise<void> => {
      return request(`/tickets/${ticketId}/comments`, {
          method: 'POST',
          body: JSON.stringify({ text })
      });
  },

  getTicketAttachment: async (ticketId: string, attachmentId: string): Promise<any> => {
      return request(`/tickets/${ticketId}/attachments/${attachmentId}`);
  },

  // Extraordinary Expenses
  getExpenses: async (condoId?: string): Promise<ExtraordinaryExpense[]> => {
      let url = '/expenses';
      const activeId = condoId || CondoService.getActiveCondoId();
      if (activeId) url += `?condoId=${activeId}`;
      return request<ExtraordinaryExpense[]>(url);
  },

  getExpenseDetails: async (id: string): Promise<ExtraordinaryExpense> => {
      return request<ExtraordinaryExpense>(`/expenses/${id}`);
  },

  createExpense: async (data: any): Promise<void> => {
      const activeId = CondoService.getActiveCondoId();
      if (!activeId) throw new Error("No active condo");
      return request('/expenses', {
          method: 'POST',
          body: JSON.stringify({ ...data, condoId: activeId })
      });
  },

  updateExpense: async (id: string, data: any): Promise<void> => {
      return request(`/expenses/${id}`, {
          method: 'PUT',
          body: JSON.stringify(data)
      });
  },

  deleteExpense: async (id: string): Promise<void> => {
      return request(`/expenses/${id}`, {
          method: 'DELETE'
      });
  },

  getExpenseAttachment: async (expenseId: string, attachmentId: string): Promise<any> => {
      return request(`/expenses/${expenseId}/attachments/${attachmentId}`);
  },

  getMyExpenses: async (): Promise<any[]> => {
      const activeId = CondoService.getActiveCondoId();
      return request(`/my-expenses?condoId=${activeId}`);
  },

  payExpense: async (expenseId: string, amount: number): Promise<void> => {
      return request(`/expenses/${expenseId}/pay`, {
          method: 'POST',
          body: JSON.stringify({ amount, notes: 'PayPal Payment' })
      });
  }
};