import { configureStore } from '@reduxjs/toolkit';
import GradeDeductionsSlice, {
  fetchGradeDeductions,
  createGradeDeduction,
  updateGradeDeduction,
  deleteGradeDeduction,
  clearGradeDeductions,
} from '../GradeDeductionsSlice';

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: { gradeDeductions: GradeDeductionsSlice.reducer } });

const mockDeduction = { id: '1', name: 'Union Dues', amount: 50, salary_grade_id: 'g1' };

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

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

  describe('fetchGradeDeductions', () => {
    it('populates deductions on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: [mockDeduction] });
      const store = createTestStore();
      await store.dispatch(fetchGradeDeductions());
      expect(store.getState().gradeDeductions.gradeDeductions).toEqual([mockDeduction]);
      expect(store.getState().gradeDeductions.loading).toBe(false);
    });

    it('passes filter params to API call', async () => {
      apiGet.mockResolvedValue({ data: [] });
      const store = createTestStore();
      await store.dispatch(fetchGradeDeductions({ salary_grade_id: 'g1', search: 'Union' }));
      expect(apiGet).toHaveBeenCalledWith(
        expect.stringContaining('salary_grade_id=g1'),
      );
      expect(apiGet).toHaveBeenCalledWith(
        expect.stringContaining('search=Union'),
      );
    });
  });

  describe('createGradeDeduction', () => {
    it('appends deduction on fulfilled', async () => {
      apiPost.mockResolvedValue({ data: { data: mockDeduction } });
      const store = createTestStore();
      await store.dispatch(createGradeDeduction({ name: 'Union Dues' } as any));
      expect(store.getState().gradeDeductions.gradeDeductions).toHaveLength(1);
      expect(store.getState().gradeDeductions.gradeDeductions[0]).toEqual(mockDeduction);
      expect(store.getState().gradeDeductions.loading).toBe(false);
    });
  });

  describe('updateGradeDeduction', () => {
    it('updates deduction in list on fulfilled', async () => {
      const updated = { ...mockDeduction, amount: 75 };
      apiPut.mockResolvedValue({ data: { data: updated } });
      const store = createTestStore();
      store.dispatch({ type: fetchGradeDeductions.fulfilled.type, payload: [mockDeduction] });
      await store.dispatch(updateGradeDeduction({ id: '1', amount: 75 } as any));
      expect(store.getState().gradeDeductions.gradeDeductions[0].amount).toBe(75);
      expect(store.getState().gradeDeductions.loading).toBe(false);
    });
  });

  describe('deleteGradeDeduction', () => {
    it('removes deduction from list on fulfilled', async () => {
      apiDelete.mockResolvedValue({});
      const store = createTestStore();
      store.dispatch({ type: fetchGradeDeductions.fulfilled.type, payload: [mockDeduction] });
      await store.dispatch(deleteGradeDeduction('1'));
      expect(store.getState().gradeDeductions.gradeDeductions).toEqual([]);
      expect(store.getState().gradeDeductions.loading).toBe(false);
    });
  });

  describe('clearGradeDeductions', () => {
    it('clears the deductions array', () => {
      const store = createTestStore();
      store.dispatch({ type: fetchGradeDeductions.fulfilled.type, payload: [mockDeduction] });
      store.dispatch(clearGradeDeductions());
      expect(store.getState().gradeDeductions.gradeDeductions).toEqual([]);
    });
  });
});