import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useSessionTimeout } from '../src/hooks/useSessionTimeout';

// Mock localStorage
const localStorageMock = (() => {
  let store: Record<string, string> = {};
  return {
    getItem: (key: string) => store[key] || null,
    setItem: (key: string, value: string) => { store[key] = value; },
    removeItem: (key: string) => { delete store[key]; },
    clear: () => { store = {}; },
  };
})();

Object.defineProperty(global, 'localStorage', {
  value: localStorageMock,
});

// Mock fetch
const fetchMock = vi.fn();
global.fetch = fetchMock;

describe('useSessionTimeout', () => {
  const mockLogout = vi.fn().mockResolvedValue(undefined);

  beforeEach(() => {
    vi.useFakeTimers();
    localStorage.clear();
    fetchMock.mockReset();
    mockLogout.mockClear();
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  it('should not show warning when user is active', () => {
    const { result } = renderHook(() =>
      useSessionTimeout(true, mockLogout)
    );

    expect(result.current.isWarningOpen).toBe(false);
  });

  it('should show warning after idle period approaches timeout', () => {
    const { result } = renderHook(() =>
      useSessionTimeout(true, mockLogout)
    );

    // Fast-forward 12 minutes (warning threshold is 3 min before 15 min timeout)
    act(() => {
      vi.advanceTimersByTime(12 * 60 * 1000);
    });

    // Fast-forward past the activity check interval (5 seconds)
    act(() => {
      vi.advanceTimersByTime(10 * 1000);
    });

    expect(result.current.isWarningOpen).toBe(true);
    expect(result.current.countdownSeconds).toBeGreaterThan(0);
  });

  it('should call logout when session expires', async () => {
    const { result } = renderHook(() =>
      useSessionTimeout(true, mockLogout)
    );

    // Fast-forward past the 15-minute timeout
    act(() => {
      vi.advanceTimersByTime(16 * 60 * 1000);
    });

    // Wait for async logout
    await act(async () => {
      vi.advanceTimersByTime(10 * 1000);
    });

    expect(mockLogout).toHaveBeenCalled();
  });

  it('should extend session when extendSession is called', async () => {
    fetchMock.mockResolvedValueOnce({
      json: () =>
        Promise.resolve({
          success: true,
          code: 200,
          message: 'Session refreshed',
          data: { expires_at: '2026-04-26T20:00:00Z' },
        }),
    });

    const { result } = renderHook(() =>
      useSessionTimeout(true, mockLogout)
    );

    // Trigger warning
    act(() => {
      vi.advanceTimersByTime(12 * 60 * 1000);
    });
    act(() => {
      vi.advanceTimersByTime(10 * 1000);
    });

    expect(result.current.isWarningOpen).toBe(true);

    // Extend session
    await act(async () => {
      await result.current.extendSession();
    });

    expect(result.current.isWarningOpen).toBe(false);
    expect(fetchMock).toHaveBeenCalledWith(
      expect.stringContaining('/auth/sessions/refresh'),
      expect.objectContaining({ method: 'POST' })
    );
  });

  it('should send heartbeat periodically', () => {
    fetchMock.mockResolvedValue({
      json: () =>
        Promise.resolve({
          success: true,
          code: 200,
          message: 'OK',
          data: { user: { id: '1', email: 'test@example.com' } },
        }),
    });

    renderHook(() => useSessionTimeout(true, mockLogout));

    // Fast-forward past heartbeat interval (5 minutes)
    act(() => {
      vi.advanceTimersByTime(5 * 60 * 1000 + 1000);
    });

    expect(fetchMock).toHaveBeenCalledWith(
      expect.stringContaining('/users/me'),
      expect.any(Object)
    );
  });

  it('should logout on 401 heartbeat response', async () => {
    fetchMock.mockRejectedValueOnce({ code: 401, message: 'Unauthorized' });

    renderHook(() => useSessionTimeout(true, mockLogout));

    // Fast-forward past heartbeat interval
    await act(async () => {
      vi.advanceTimersByTime(5 * 60 * 1000 + 1000);
    });

    // Wait for the async catch block
    await act(async () => {
      await Promise.resolve();
    });

    expect(mockLogout).toHaveBeenCalled();
  });
});