import { configureStore } from '@reduxjs/toolkit';
import PayrollPeriodsSlice, {
  fetchPayrollPeriods,
  fetchPayrollPeriod,
  createPayrollPeriod,
  deletePayrollPeriod,
  lockPayrollPeriod,
  unlockPayrollPeriod,
  clearSelectedPeriod,
} from '../PayrollPeriodsSlice';

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

const createTestStore = () =>
  configureStore({ reducer: { payrollPeriods: PayrollPeriodsSlice.reducer } });

const mockPeriod = { id: '1', name: 'Jan 2026', year: 2026, month: 1, is_locked: false };

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

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

  describe('fetchPayrollPeriods', () => {
    it('populates periods on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: [mockPeriod] });
      const store = createTestStore();
      await store.dispatch(fetchPayrollPeriods());
      expect(store.getState().payrollPeriods.periods).toEqual([mockPeriod]);
    });
  });

  describe('fetchPayrollPeriod', () => {
    it('sets selectedPeriod on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: mockPeriod });
      const store = createTestStore();
      await store.dispatch(fetchPayrollPeriod('1'));
      expect(store.getState().payrollPeriods.selectedPeriod).toEqual(mockPeriod);
    });
  });

  describe('createPayrollPeriod', () => {
    it('prepends new period on fulfilled', async () => {
      apiPost.mockResolvedValue({ data: { data: mockPeriod } });
      const store = createTestStore();
      await store.dispatch(createPayrollPeriod({ year: 2026, month: 1 } as any));
      expect(store.getState().payrollPeriods.periods[0]).toEqual(mockPeriod);
    });
  });

  describe('deletePayrollPeriod', () => {
    it('removes period from list on fulfilled', async () => {
      apiDelete.mockResolvedValue({ data: { id: '1', message: 'Deleted' } });
      const store = createTestStore();
      store.dispatch({ type: fetchPayrollPeriods.fulfilled.type, payload: [mockPeriod] });
      await store.dispatch(deletePayrollPeriod('1'));
      expect(store.getState().payrollPeriods.periods).toEqual([]);
    });
  });

  describe('lockPayrollPeriod', () => {
    it('updates period in list on fulfilled', async () => {
      const locked = { ...mockPeriod, is_locked: true };
      apiPost.mockResolvedValue({ data: { data: locked } });
      const store = createTestStore();
      store.dispatch({ type: fetchPayrollPeriods.fulfilled.type, payload: [mockPeriod] });
      await store.dispatch(lockPayrollPeriod('1'));
      expect(store.getState().payrollPeriods.periods[0].is_locked).toBe(true);
    });
  });

  describe('unlockPayrollPeriod', () => {
    it('updates period in list on fulfilled', async () => {
      const locked = { ...mockPeriod, is_locked: true };
      const unlocked = { ...mockPeriod, is_locked: false };
      apiPost.mockResolvedValue({ data: { data: unlocked } });
      const store = createTestStore();
      store.dispatch({ type: fetchPayrollPeriods.fulfilled.type, payload: [locked] });
      await store.dispatch(unlockPayrollPeriod('1'));
      expect(store.getState().payrollPeriods.periods[0].is_locked).toBe(false);
    });
  });

  describe('clearSelectedPeriod', () => {
    it('clears selectedPeriod', () => {
      const store = createTestStore();
      store.dispatch({ type: fetchPayrollPeriod.fulfilled.type, payload: mockPeriod });
      store.dispatch(clearSelectedPeriod());
      expect(store.getState().payrollPeriods.selectedPeriod).toBeNull();
    });
  });
});