import { create } from 'zustand';
import { apiClient } from './api-client';

interface User {
  id: string;
  email: string;
  fullName: string;
  phone?: string;
  role: string;
  passengerId?: string;
  dateOfBirth?: string;
  gender?: string;
  nationality?: string;
  nationalityCode?: string;
  nationalId?: string;
  passportNumber?: string;
  passportCountry?: string;
  passportIssueDate?: string;
  passportExpiryDate?: string;
  passportIssuingAuthority?: string;
  faydaVerified?: boolean;
  faydaSub?: string;
  faydaVerifiedAt?: string;
  lastLoginAt?: string;
  createdAt?: string;
}

interface AuthState {
  user: User | null;
  token: string | null;
  isAuthenticated: boolean;
  isInitialized: boolean;
  login: (email: string, password: string) => Promise<void>;
  register: (data: RegisterData) => Promise<RegisterResult>;
  logout: () => Promise<void>;
  setUser: (user: User, token: string) => void;
  updateUser: (userData: Partial<User>) => void;
  initialize: () => Promise<void>;
  fetchProfile: () => Promise<void>;
}

interface RegisterData {
  fullName: string;
  email: string;
  phone: string;
}

interface RegisterResult {
  iamUserId: string;
  email: string;
  phoneNumber: string;
}

export const useAuthStore = create<AuthState>((set, get) => ({
      user: null,
      token: null,
      isAuthenticated: false,
      isInitialized: false,

      initialize: async () => {
        if (typeof window === 'undefined') return;
        const token = localStorage.getItem('auth_token');
        const userStr = localStorage.getItem('auth_user');
        
        if (token && userStr) {
          try {
            const user = JSON.parse(userStr);
            set({ user, token, isAuthenticated: true, isInitialized: true });
            
            // Fetch fresh profile data in background
            get().fetchProfile().catch(() => {
              // If profile fetch fails, token might be expired
              console.warn('Failed to fetch profile, token might be expired');
            });
          } catch (e) {
            localStorage.removeItem('auth_token');
            localStorage.removeItem('auth_user');
            set({ isInitialized: true });
          }
        } else {
          set({ isInitialized: true });
        }
      },

      fetchProfile: async () => {
        if (typeof window === 'undefined') return;
        const token = localStorage.getItem('auth_token');
        if (!token) return;
        
        try {
          const response: any = await apiClient.get('/auth/profile', {
            headers: { 'Authorization': `Bearer ${token}` }
          });
          const userData = response.data || response;
          
          if (typeof window !== 'undefined') {
            localStorage.setItem('auth_user', JSON.stringify(userData));
          }
          set({ user: userData });
        } catch (error: any) {
          // If 401, token is invalid - logout
          if (error.response?.status === 401) {
            if (typeof window !== 'undefined') {
              localStorage.removeItem('auth_token');
              localStorage.removeItem('auth_user');
            }
            set({ user: null, token: null, isAuthenticated: false });
          }
          throw error;
        }
      },

      login: async (email: string, password: string) => {
        const response: any = await apiClient.post('/auth/login', { email, password });
        const { token, user } = response.data || response;
        
        if (typeof window !== 'undefined') {
          localStorage.setItem('auth_token', token);
          localStorage.setItem('auth_user', JSON.stringify(user));
        }
        
        set({ user, token, isAuthenticated: true });
      },

      register: async (data: RegisterData): Promise<RegisterResult> => {
        // Shape required by the passenger-api RegisterDto; username = email by convention.
        // Registration no longer takes a password — the account is created as pending and
        // an SMS verification code is sent. The user completes signup on the verify-account
        // page (set-password). No token is issued here; the user is NOT logged in yet.
        const payload = {
          email: data.email,
          username: data.email,
          phoneNumber: data.phone,
          name: { en: data.fullName, am: data.fullName },
        };
        const response: any = await apiClient.post('/auth/register', payload);
        const result = response.data || response;
        return {
          iamUserId: result.iamUserId,
          email: result.email,
          phoneNumber: result.phoneNumber,
        };
      },

      logout: async () => {
        try {
          const token = typeof window !== 'undefined' ? localStorage.getItem('auth_token') : null;
          if (token) {
            // Call logout endpoint to invalidate session on backend
            await apiClient.post('/auth/logout', {}, {
              headers: {
                'Authorization': `Bearer ${token}`
              }
            });
          }
        } catch (error) {
          console.error('Logout API call failed:', error);
          // Continue with logout even if API call fails
        }
        
        // Clear local storage and state
        if (typeof window !== 'undefined') {
          localStorage.removeItem('auth_token');
          localStorage.removeItem('auth_user');
        }
        set({ user: null, token: null, isAuthenticated: false });
        
        // Redirect to home page after state is updated
        if (typeof window !== 'undefined') {
          setTimeout(() => {
            window.location.href = '/';
          }, 100);
        }
      },

      setUser: (user: User, token: string) => {
        if (typeof window !== 'undefined') {
          localStorage.setItem('auth_token', token);
          localStorage.setItem('auth_user', JSON.stringify(user));
        }
        set({ user, token, isAuthenticated: true });
      },

      updateUser: (userData: Partial<User>) => {
        if (typeof window !== 'undefined') {
          const currentUser = JSON.parse(localStorage.getItem('auth_user') || '{}');
          const updatedUser = { ...currentUser, ...userData };
          localStorage.setItem('auth_user', JSON.stringify(updatedUser));
          set({ user: updatedUser });
        }
      },
  })
);