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

// --- CONFIGURATION TOGGLE ---
const FORCE_LOCAL_DB = false; 
const API_URL = '/api'; 

const STORAGE_KEYS = {
  TOKEN: 'condo_auth_token',
  USER: 'condo_user_info',
  ACTIVE_CONDO_ID: 'condo_active_id',
};

const getAuthHeaders = () => {
  const token = localStorage.getItem(STORAGE_KEYS.TOKEN);
  return token ? { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json' } : { 'Content-Type': 'application/json' };
};

const request = async <T>(endpoint: string, options: RequestInit = {}): Promise<T> => {
    const response = await fetch(`${API_URL}${endpoint}`, {
        ...options,
        headers: {
            ...getAuthHeaders(),
            ...options.headers,
        },
    });

    if (response.status === 401) {
        CondoService.logout();
        throw new Error("Unauthorized");
    }

    if (!response.ok) {
        const errText = await response.text();
        throw new Error(errText || `API Error: ${response.status}`);
    }

    return response.json();
};

export const CondoService = {
  
  // --- CONDO CONTEXT MANAGEMENT ---

  getActiveCondoId: (): string | null => {
     return localStorage.getItem(STORAGE_KEYS.ACTIVE_CONDO_ID);
  },

  setActiveCondo: (condoId: string) => {
     localStorage.setItem(STORAGE_KEYS.ACTIVE_CONDO_ID, condoId);
     window.location.reload();
  },

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

  getActiveCondo: async (): Promise<Condo | undefined> => {
      const condos = await CondoService.getCondos();
      const activeId = CondoService.getActiveCondoId();
      if (!activeId && condos.length > 0) {
          // Do not reload here, just set it silently or let the UI handle it
          localStorage.setItem(STORAGE_KEYS.ACTIVE_CONDO_ID, condos[0].id);
          return condos[0];
      }
      return condos.find(c => c.id === activeId);
  },

  saveCondo: async (condo: Condo): Promise<Condo> => {
      // If no ID, it's a creation
      if (!condo.id || condo.id.length < 5) { // Simple check if it's a new ID request
          return request<Condo>('/condos', {
              method: 'POST',
              body: JSON.stringify(condo)
          });
      } else {
          return request<Condo>(`/condos/${condo.id}`, {
              method: 'PUT',
              body: JSON.stringify(condo)
          });
      }
  },

  deleteCondo: async (id: string) => {
      await request(`/condos/${id}`, { method: 'DELETE' });
      if (localStorage.getItem(STORAGE_KEYS.ACTIVE_CONDO_ID) === id) {
          localStorage.removeItem(STORAGE_KEYS.ACTIVE_CONDO_ID);
      }
  },

  // --- NOTICES (BACHECA) ---

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

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

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

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

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

  // --- AUTH ---

  login: async (email, password) => {
      const data = await request<{token: string, user: User}>('/auth/login', {
          method: 'POST',
          body: JSON.stringify({ email, password })
      });
      
      localStorage.setItem(STORAGE_KEYS.TOKEN, data.token);
      localStorage.setItem(STORAGE_KEYS.USER, JSON.stringify(data.user));

      // Set active condo if user belongs to a family
      if (data.user.familyId) {
          try {
              const families = await CondoService.getFamilies(); // This will filter by user perms automatically on server
              const fam = families.find(f => f.id === data.user.familyId);
              if (fam) {
                  localStorage.setItem(STORAGE_KEYS.ACTIVE_CONDO_ID, fam.condoId);
              }
          } catch (e) { console.error("Could not set active condo on login", e); }
      }

      return data;
  },

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

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

  updateProfile: async (data: Partial<User> & { password?: string }) => {
    return request<{success: true, user: User}>('/profile', {
        method: 'PUT',
        body: JSON.stringify(data)
    });
  },

  // --- SETTINGS (Global) ---

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

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

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

  // --- 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 (familyData: Omit<Family, 'id' | 'balance' | 'condoId'>): Promise<Family> => {
    const activeCondoId = CondoService.getActiveCondoId();
    if (!activeCondoId) throw new Error("Nessun condominio selezionato");

    return request<Family>('/families', {
        method: 'POST',
        body: JSON.stringify({ ...familyData, condoId: activeCondoId })
    });
  },

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

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

  // --- PAYMENTS ---

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

  // --- USERS ---

  getUsers: async (condoId?: string): Promise<User[]> => {
    let url = '/users';
    const activeId = condoId || CondoService.getActiveCondoId();
    if (activeId) url += `?condoId=${activeId}`;
    return request<User[]>(url);
  },
  
  createUser: async (userData: any) => {
     return request('/users', {
         method: 'POST',
         body: JSON.stringify(userData)
     });
  },

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

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

  // --- ALERTS ---

  getAlerts: async (condoId?: string): Promise<AlertDefinition[]> => {
      let url = '/alerts';
      const activeId = condoId || CondoService.getActiveCondoId();
      if (activeId) url += `?condoId=${activeId}`;
      return request<AlertDefinition[]>(url);
  },
  
  saveAlert: async (alert: AlertDefinition & { condoId?: string }): Promise<AlertDefinition> => {
     const activeCondoId = CondoService.getActiveCondoId();
     if (!alert.id) {
         return request<AlertDefinition>('/alerts', {
             method: 'POST',
             body: JSON.stringify({ ...alert, condoId: activeCondoId })
         });
     } else {
         return request<AlertDefinition>(`/alerts/${alert.id}`, {
             method: 'PUT',
             body: JSON.stringify(alert)
         });
     }
  },

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

  // --- TICKETS ---

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

  createTicket: async (data: Omit<Partial<Ticket>, 'attachments'> & { attachments?: { fileName: string, fileType: string, data: string }[] }) => {
     const activeId = CondoService.getActiveCondoId();
     if(!activeId) throw new Error("No active condo");
     return request('/tickets', {
         method: 'POST',
         body: JSON.stringify({ ...data, condoId: activeId })
     });
  },

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

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

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

  // --- SEEDING ---
  seedPayments: () => {
    // No-op in remote mode
  }
};