import { configureStore } from '@reduxjs/toolkit';
import SalaryGradesSlice, {
  fetchSalaryGrades,
  createSalaryGrade,
  updateSalaryGrade,
  deleteSalaryGrade,
} from '../SalaryGradesSlice';

jest.mock('@/services/api/api', () => ({
  apiGet: jest.fn(),
  apiPost: jest.fn(),
  apiPut: jest.fn(),
  apiDelete: jest.fn(),
}));

jest.mock('antd', () => ({
  message: { success: jest.fn(), error: jest.fn(), warning: jest.fn() },
}));

jest.mock('@/utilities/Helpers', () => {
  const mockHelpers = { handleServerError: jest.fn((e: any) => e?.message || 'Error') };
  return { __esModule: true, default: mockHelpers };
});

const { apiGet, apiPost, apiPut, apiDelete } = require('@/services/api/api');

const createTestStore = () =>
  configureStore({ reducer: { salaryGrades: SalaryGradesSlice.reducer } });

const mockGrade = { id: '1', name: 'Grade A', code: 'GA' };

describe('SalaryGradesSlice', () => {
  beforeEach(() => jest.clearAllMocks());

  it('has correct initial state', () => {
    const store = createTestStore();
    const state = store.getState().salaryGrades;
    expect(state.salaryGrades).toEqual([]);
    expect(state.loading).toBe(false);
    expect(state.error).toBeNull();
  });

  describe('fetchSalaryGrades', () => {
    it('populates grades on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: [mockGrade] });
      const store = createTestStore();
      await store.dispatch(fetchSalaryGrades());
      const state = store.getState().salaryGrades;
      expect(state.salaryGrades).toEqual([mockGrade]);
      expect(state.loading).toBe(false);
    });

    it('sets error on rejected', async () => {
      apiGet.mockRejectedValue(new Error('fail'));
      const store = createTestStore();
      await store.dispatch(fetchSalaryGrades());
      const state = store.getState().salaryGrades;
      expect(state.loading).toBe(false);
      expect(state.error).toBeTruthy();
    });
  });

  describe('createSalaryGrade', () => {
    it('prepends new grade on fulfilled', async () => {
      apiPost.mockResolvedValue({ data: { data: mockGrade } });
      const store = createTestStore();
      await store.dispatch(createSalaryGrade({ name: 'Grade A', code: 'GA' } as any));
      expect(store.getState().salaryGrades.salaryGrades[0]).toEqual(mockGrade);
    });
  });

  describe('updateSalaryGrade', () => {
    it('updates grade in list on fulfilled', async () => {
      const updated = { ...mockGrade, name: 'Grade B' };
      apiPut.mockResolvedValue({ data: { data: updated } });
      const store = createTestStore();
      store.dispatch({ type: fetchSalaryGrades.fulfilled.type, payload: [mockGrade] });
      await store.dispatch(updateSalaryGrade({ id: '1', name: 'Grade B' } as any));
      expect(store.getState().salaryGrades.salaryGrades[0].name).toBe('Grade B');
    });
  });

  describe('deleteSalaryGrade', () => {
    it('removes grade from list on fulfilled', async () => {
      apiDelete.mockResolvedValue({ data: { id: '1', message: 'Deleted' } });
      const store = createTestStore();
      store.dispatch({ type: fetchSalaryGrades.fulfilled.type, payload: [mockGrade] });
      await store.dispatch(deleteSalaryGrade('1'));
      expect(store.getState().salaryGrades.salaryGrades).toEqual([]);
    });
  });
});