import { useAuthStore, initAuthStore } from '@/stores/authStore';
import { api, setOnUnauthorizedCallback } from '@/services/api';
import type { User } from '@/types';

// Mock the API service
jest.mock('@/services/api', () => ({
  api: {
    isAuthenticated: jest.fn(),
    getStoredUser: jest.fn(),
    checkEmail: jest.fn(),
    requestOTP: jest.fn(),
    verifyOTP: jest.fn(),
    logout: jest.fn(),
  },
  setOnUnauthorizedCallback: jest.fn(),
}));

describe('authStore', () => {
  beforeEach(() => {
    // Reset store to initial state before each test
    useAuthStore.setState({
      user: null,
      isLoading: false,
      isInitializing: true,
      isAuthenticated: false,
      error: null,
    });

    // Clear all mocks
    jest.clearAllMocks();
  });

  describe('initialization', () => {
    it('should initialize with correct default state', () => {
      const state = useAuthStore.getState();

      expect(state.user).toBeNull();
      expect(state.isLoading).toBe(false);
      expect(state.isInitializing).toBe(true);
      expect(state.isAuthenticated).toBe(false);
      expect(state.error).toBeNull();
    });

    it('should setup unauthorized callback on init', () => {
      initAuthStore();

      expect(setOnUnauthorizedCallback).toHaveBeenCalledTimes(1);
      expect(setOnUnauthorizedCallback).toHaveBeenCalledWith(expect.any(Function));
    });

    it('should check auth on init when user is authenticated', async () => {
      const mockUser: User = {
        user_id: 1,
        email: 'test@example.com',
        firstName: 'John',
        lastName: 'Doe',
        max_role: 'USER',
        privileges: '',
      };

      (api.isAuthenticated as jest.Mock).mockResolvedValue(true);
      (api.getStoredUser as jest.Mock).mockResolvedValue(mockUser);

      await useAuthStore.getState()._checkAuth();

      const state = useAuthStore.getState();
      expect(state.user).toEqual(mockUser);
      expect(state.isAuthenticated).toBe(true);
      expect(state.isInitializing).toBe(false);
      expect(state.error).toBeNull();
    });

    it('should handle unauthenticated state on init', async () => {
      (api.isAuthenticated as jest.Mock).mockResolvedValue(false);

      await useAuthStore.getState()._checkAuth();

      const state = useAuthStore.getState();
      expect(state.user).toBeNull();
      expect(state.isAuthenticated).toBe(false);
      expect(state.isInitializing).toBe(false);
    });

    it('should handle auth check errors', async () => {
      (api.isAuthenticated as jest.Mock).mockRejectedValue(new Error('Network error'));

      await useAuthStore.getState()._checkAuth();

      const state = useAuthStore.getState();
      expect(state.user).toBeNull();
      expect(state.isAuthenticated).toBe(false);
      expect(state.isInitializing).toBe(false);
      expect(state.error).toEqual({ message: 'Failed to check authentication' });
    });
  });

  describe('checkEmail', () => {
    it('should return exists: true for existing email', async () => {
      (api.checkEmail as jest.Mock).mockResolvedValue({
        ok: true,
        data: { exists: true, name: 'John Doe' },
      });

      const result = await useAuthStore.getState().checkEmail('test@example.com');

      expect(result).toEqual({ exists: true, name: 'John Doe' });
      expect(api.checkEmail).toHaveBeenCalledWith('test@example.com');

      const state = useAuthStore.getState();
      expect(state.isLoading).toBe(false);
      expect(state.error).toBeNull();
    });

    it('should return exists: false for new email', async () => {
      (api.checkEmail as jest.Mock).mockResolvedValue({
        ok: true,
        data: { exists: false },
      });

      const result = await useAuthStore.getState().checkEmail('new@example.com');

      expect(result).toEqual({ exists: false });
      const state = useAuthStore.getState();
      expect(state.isLoading).toBe(false);
    });

    it('should handle API failure gracefully', async () => {
      (api.checkEmail as jest.Mock).mockResolvedValue({
        ok: false,
        error: { message: 'API error' },
      });

      const result = await useAuthStore.getState().checkEmail('test@example.com');

      expect(result).toEqual({ exists: false });
      const state = useAuthStore.getState();
      expect(state.isLoading).toBe(false);
    });

    it('should handle network errors', async () => {
      (api.checkEmail as jest.Mock).mockRejectedValue(new Error('Network error'));

      const result = await useAuthStore.getState().checkEmail('test@example.com');

      expect(result).toEqual({ exists: false });
      const state = useAuthStore.getState();
      expect(state.error).toEqual({ message: 'Network error. Please check your connection.' });
    });
  });

  describe('requestOtp', () => {
    it('should successfully request OTP', async () => {
      (api.requestOTP as jest.Mock).mockResolvedValue({
        ok: true,
        data: { message: 'OTP sent' },
      });

      const result = await useAuthStore.getState().requestOtp('test@example.com');

      expect(result).toEqual({ success: true, skipOtp: false });
      expect(api.requestOTP).toHaveBeenCalledWith('test@example.com');

      const state = useAuthStore.getState();
      expect(state.isLoading).toBe(false);
      expect(state.error).toBeNull();
    });

    it('should handle OTP request failure', async () => {
      (api.requestOTP as jest.Mock).mockResolvedValue({
        ok: false,
        error: { message: 'Failed to send OTP' },
      });

      const result = await useAuthStore.getState().requestOtp('test@example.com');

      expect(result).toEqual({ success: false, skipOtp: false });
      const state = useAuthStore.getState();
      expect(state.error).toEqual({ message: 'Failed to send verification code. Please try again.' });
    });

    it('should handle network errors', async () => {
      (api.requestOTP as jest.Mock).mockRejectedValue(new Error('Network error'));

      const result = await useAuthStore.getState().requestOtp('test@example.com');

      expect(result).toEqual({ success: false, skipOtp: false });
      const state = useAuthStore.getState();
      expect(state.error).toEqual({ message: 'Network error. Please check your connection.' });
    });
  });

  describe('verifyOtp', () => {
    it('should successfully verify OTP and authenticate user', async () => {
      const mockApiResponse = {
        ok: true,
        data: {
          token: 'jwt-token-123',
          user: {
            id: 1,
            email: 'test@example.com',
            first_name: 'John',
            last_name: 'Doe',
          },
        },
      };

      (api.verifyOTP as jest.Mock).mockResolvedValue(mockApiResponse);

      const result = await useAuthStore.getState().verifyOtp('test@example.com', '123456');

      expect(result).toBe(true);
      expect(api.verifyOTP).toHaveBeenCalledWith('test@example.com', '123456');

      const state = useAuthStore.getState();
      expect(state.isAuthenticated).toBe(true);
      expect(state.user).toEqual({
        user_id: 1,
        email: 'test@example.com',
        firstName: 'John',
        lastName: 'Doe',
        max_role: 'USER',
        privileges: '',
      });
      expect(state.isLoading).toBe(false);
      expect(state.isInitializing).toBe(false);
      expect(state.error).toBeNull();
    });

    it('should handle invalid OTP code', async () => {
      (api.verifyOTP as jest.Mock).mockResolvedValue({
        ok: false,
        error: { message: 'Invalid OTP' },
      });

      const result = await useAuthStore.getState().verifyOtp('test@example.com', '000000');

      expect(result).toBe(false);
      const state = useAuthStore.getState();
      expect(state.isAuthenticated).toBe(false);
      expect(state.error).toEqual({ message: 'Invalid verification code. Please try again.' });
    });

    it('should handle verification errors', async () => {
      (api.verifyOTP as jest.Mock).mockRejectedValue(new Error('Verification failed'));

      const result = await useAuthStore.getState().verifyOtp('test@example.com', '123456');

      expect(result).toBe(false);
      const state = useAuthStore.getState();
      expect(state.error).toEqual({ message: 'Verification failed' });
    });
  });

  describe('logout', () => {
    it('should successfully logout and clear state', async () => {
      // Setup authenticated state
      useAuthStore.setState({
        user: {
          user_id: 1,
          email: 'test@example.com',
          firstName: 'John',
          lastName: 'Doe',
          max_role: 'USER',
          privileges: '',
        },
        isAuthenticated: true,
        isInitializing: false,
      });

      (api.logout as jest.Mock).mockResolvedValue(undefined);

      await useAuthStore.getState().logout();

      expect(api.logout).toHaveBeenCalledTimes(1);

      const state = useAuthStore.getState();
      expect(state.user).toBeNull();
      expect(state.isAuthenticated).toBe(false);
      expect(state.isLoading).toBe(false);
      expect(state.isInitializing).toBe(false);
      expect(state.error).toBeNull();
    });

    it('should clear state even if API logout fails', async () => {
      useAuthStore.setState({
        user: {
          user_id: 1,
          email: 'test@example.com',
          firstName: 'John',
          lastName: 'Doe',
          max_role: 'USER',
          privileges: '',
        },
        isAuthenticated: true,
      });

      // Mock logout to fail
      (api.logout as jest.Mock).mockImplementation(() => Promise.reject(new Error('Logout failed')));

      // Logout should still clear state even if API call fails
      // The try/finally in logout ensures state is cleared
      try {
        await useAuthStore.getState().logout();
      } catch {
        // Error is expected and caught by try/finally in store
      }

      const state = useAuthStore.getState();
      expect(state.user).toBeNull();
      expect(state.isAuthenticated).toBe(false);
    });
  });

  describe('clearError', () => {
    it('should clear error state', () => {
      useAuthStore.setState({
        error: { message: 'Test error' },
      });

      useAuthStore.getState().clearError();

      const state = useAuthStore.getState();
      expect(state.error).toBeNull();
    });
  });

  describe('refreshAuth', () => {
    it('should re-check authentication', async () => {
      const mockUser: User = {
        user_id: 1,
        email: 'test@example.com',
        firstName: 'John',
        lastName: 'Doe',
        max_role: 'USER',
        privileges: '',
      };

      (api.isAuthenticated as jest.Mock).mockResolvedValue(true);
      (api.getStoredUser as jest.Mock).mockResolvedValue(mockUser);

      await useAuthStore.getState().refreshAuth();

      const state = useAuthStore.getState();
      expect(state.user).toEqual(mockUser);
      expect(state.isAuthenticated).toBe(true);
    });
  });

  describe('updateUser', () => {
    it('should update user profile in state', () => {
      const initialUser: User = {
        user_id: 1,
        email: 'test@example.com',
        firstName: 'John',
        lastName: 'Doe',
        max_role: 'USER',
        privileges: '',
      };

      useAuthStore.setState({ user: initialUser });

      useAuthStore.getState().updateUser({
        firstName: 'Jane',
        lastName: 'Smith',
      });

      const state = useAuthStore.getState();
      expect(state.user).toEqual({
        user_id: 1,
        email: 'test@example.com',
        firstName: 'Jane',
        lastName: 'Smith',
        max_role: 'USER',
        privileges: '',
      });
    });

    it('should not update if user is null', () => {
      useAuthStore.setState({ user: null });

      useAuthStore.getState().updateUser({
        firstName: 'Jane',
      });

      const state = useAuthStore.getState();
      expect(state.user).toBeNull();
    });
  });

  describe('unauthorized callback', () => {
    it('should logout user when unauthorized callback is triggered', async () => {
      (setOnUnauthorizedCallback as jest.Mock).mockImplementation(() => {
        // Callback is registered
      });

      (api.logout as jest.Mock).mockResolvedValue(undefined);

      // Setup authenticated state
      useAuthStore.setState({
        user: {
          user_id: 1,
          email: 'test@example.com',
          firstName: 'John',
          lastName: 'Doe',
          max_role: 'USER',
          privileges: '',
        },
        isAuthenticated: true,
      });

      // Initialize store to set up callback
      useAuthStore.getState()._setUnauthorizedCallback();

      // Verify callback was set
      expect(setOnUnauthorizedCallback).toHaveBeenCalled();

      // Get the callback that was registered
      const registeredCallback = (setOnUnauthorizedCallback as jest.Mock).mock.calls[0][0];

      // Trigger the callback
      await registeredCallback();

      // Wait for async operations to complete
      await new Promise(resolve => setTimeout(resolve, 50));

      const state = useAuthStore.getState();
      expect(state.user).toBeNull();
      expect(state.isAuthenticated).toBe(false);
      expect(state.error).toEqual({ message: 'Session expired. Please login again.' });
    });
  });

  describe('selector hooks', () => {
    it('should provide optimized selectors', () => {
      const mockUser: User = {
        user_id: 1,
        email: 'test@example.com',
        firstName: 'John',
        lastName: 'Doe',
        max_role: 'USER',
        privileges: '',
      };

      useAuthStore.setState({
        user: mockUser,
        isAuthenticated: true,
        isLoading: false,
        error: { message: 'Test error' },
      });

      // Import at top of file handles this
      // Just verify the store state is accessible
      const state = useAuthStore.getState();
      expect(state.user).toEqual(mockUser);
      expect(state.isAuthenticated).toBe(true);
      expect(state.isLoading).toBe(false);
      expect(state.error).toEqual({ message: 'Test error' });
    });
  });
});