import { configureStore } from '@reduxjs/toolkit';
import EmployeeGradeAssignmentsSlice, {
  fetchEmployeeGradeAssignment,
  fetchEmployeeGradeAssignmentHistory,
  upsertEmployeeGradeAssignment,
} from '../EmployeeGradeAssignmentsSlice';

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

const createTestStore = () =>
  configureStore({ reducer: { employeeGradeAssignments: EmployeeGradeAssignmentsSlice.reducer } });

const mockAssignment = { id: '1', employee_id: 'e1', salary_grade_id: 'g1', salary_notch_id: 'n1' };

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

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

  describe('fetchEmployeeGradeAssignment', () => {
    it('sets assignment on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: { data: mockAssignment } });
      const store = createTestStore();
      await store.dispatch(fetchEmployeeGradeAssignment('e1'));
      expect(store.getState().employeeGradeAssignments.assignment).toEqual(mockAssignment);
      expect(store.getState().employeeGradeAssignments.loading).toBe(false);
    });

    it('clears assignment on pending', () => {
      const store = createTestStore();
      store.dispatch({ type: fetchEmployeeGradeAssignment.pending.type });
      expect(store.getState().employeeGradeAssignments.assignment).toBeNull();
      expect(store.getState().employeeGradeAssignments.loading).toBe(true);
    });
  });

  describe('fetchEmployeeGradeAssignmentHistory', () => {
    it('populates history on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: { data: [mockAssignment] } });
      const store = createTestStore();
      await store.dispatch(fetchEmployeeGradeAssignmentHistory('e1'));
      expect(store.getState().employeeGradeAssignments.history).toEqual([mockAssignment]);
      expect(store.getState().employeeGradeAssignments.historyLoading).toBe(false);
    });
  });

  describe('upsertEmployeeGradeAssignment', () => {
    it('sets saving on pending and assignment on fulfilled', async () => {
      apiPut.mockResolvedValue({ data: { data: mockAssignment } });
      const store = createTestStore();
      const promise = store.dispatch(upsertEmployeeGradeAssignment({ employee_id: 'e1', salary_grade_id: 'g1' } as any));
      expect(store.getState().employeeGradeAssignments.saving).toBe(true);
      await promise;
      expect(store.getState().employeeGradeAssignments.saving).toBe(false);
      expect(store.getState().employeeGradeAssignments.assignment).toEqual(mockAssignment);
    });
  });
});