import { configureStore } from '@reduxjs/toolkit';
import LoansSlice, {
  fetchLoans,
  fetchLoan,
  createLoan,
  updateLoan,
  deleteLoan,
  recordRepayment,
  clearSelectedLoan,
} from '../LoansSlice';

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: { loans: LoansSlice.reducer } });

const mockLoan = { id: '1', employee_id: 'e1', amount: 10000, status: 'active' };

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

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

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

  describe('fetchLoan', () => {
    it('sets selectedLoan on fulfilled', async () => {
      apiGet.mockResolvedValue({ data: mockLoan });
      const store = createTestStore();
      await store.dispatch(fetchLoan('1'));
      expect(store.getState().loans.selectedLoan).toEqual(mockLoan);
    });
  });

  describe('createLoan', () => {
    it('prepends new loan on fulfilled', async () => {
      apiPost.mockResolvedValue({ data: { data: mockLoan } });
      const store = createTestStore();
      await store.dispatch(createLoan({ employee_id: 'e1', amount: 10000 } as any));
      expect(store.getState().loans.loans[0]).toEqual(mockLoan);
    });
  });

  describe('updateLoan', () => {
    it('updates loan in list and selectedLoan on fulfilled', async () => {
      const updated = { ...mockLoan, amount: 15000 };
      apiPut.mockResolvedValue({ data: { data: updated } });
      const store = createTestStore();
      store.dispatch({ type: fetchLoans.fulfilled.type, payload: [mockLoan] });
      store.dispatch({ type: fetchLoan.fulfilled.type, payload: mockLoan });
      await store.dispatch(updateLoan({ id: '1', amount: 15000 } as any));
      expect(store.getState().loans.loans[0].amount).toBe(15000);
      expect(store.getState().loans.selectedLoan?.amount).toBe(15000);
    });
  });

  describe('deleteLoan', () => {
    it('removes loan from list on fulfilled', async () => {
      apiDelete.mockResolvedValue({ data: { id: '1', message: 'Deleted' } });
      const store = createTestStore();
      store.dispatch({ type: fetchLoans.fulfilled.type, payload: [mockLoan] });
      await store.dispatch(deleteLoan('1'));
      expect(store.getState().loans.loans).toEqual([]);
    });
  });

  describe('recordRepayment', () => {
    it('sets loading on pending and clears on fulfilled', async () => {
      apiPost.mockResolvedValue({ data: { data: { id: 'r1' } } });
      const store = createTestStore();
      await store.dispatch(recordRepayment({ loan_id: '1', amount: 500 } as any));
      expect(store.getState().loans.loading).toBe(false);
    });
  });

  describe('clearSelectedLoan', () => {
    it('clears selectedLoan', () => {
      const store = createTestStore();
      store.dispatch({ type: fetchLoan.fulfilled.type, payload: mockLoan });
      store.dispatch(clearSelectedLoan());
      expect(store.getState().loans.selectedLoan).toBeNull();
    });
  });
});