import { renderHook, waitFor } from '@testing-library/react';
import { describe, it, expect, vi, beforeEach } from 'vitest';
import { useStats, useSummary } from '../../../src/hooks/useStats';
import * as api from '../../../src/api/client';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';

// Mock the api client
vi.mock('../../../src/api/client', () => ({
  fetchDailySummary: vi.fn(),
  fetchTimetable: vi.fn(),
  fetchWakeSleepTimes: vi.fn(),
  fetchSummary: vi.fn(),
}));

const createTestQueryClient = () => new QueryClient({
  defaultOptions: {
    queries: {
      retry: false,
      gcTime: 0,
    },
  },
});

describe('useStats', () => {
  const wrapper = ({ children }: { children: React.ReactNode }) => (
    <QueryClientProvider client={createTestQueryClient()}>
      {children}
    </QueryClientProvider>
  );

  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should return data and correctly transform daily stats on success', async () => {
    const mockDailySummary = {
      days: [
        { date: '2024-01-01', total_minutes: 480, day_minutes: 240, night_minutes: 240 },
        { date: '2024-01-02', total_minutes: 540, day_minutes: 300, night_minutes: 240 },
      ],
    };
    const mockTimetable = { slots: [] };
    const mockWakeupBedtime = { days: [] };

    vi.mocked(api.fetchDailySummary).mockResolvedValueOnce(mockDailySummary);
    vi.mocked(api.fetchTimetable).mockResolvedValueOnce(mockTimetable);
    vi.mocked(api.fetchWakeSleepTimes).mockResolvedValueOnce(mockWakeupBedtime);

    const { result } = renderHook(() => useStats('2024-01-01', '2024-01-02'), { wrapper });

    // Initially loading
    expect(result.current.isLoading).toBe(true);

    await waitFor(() => expect(result.current.isLoading).toBe(false));

    // Verify raw data
    expect(result.current.dailySummary).toEqual(mockDailySummary);

    // Verify transformation (total, day/night split in hours)
    expect(result.current.transformedDailySummary).toEqual([
      { date: '2024-01-01', daySleep: 4, nightSleep: 4, total: 8 },
      { date: '2024-01-02', daySleep: 5, nightSleep: 4, total: 9 },
    ]);

    expect(result.current.timetable).toEqual(mockTimetable);
    expect(result.current.wakeupBedtime).toEqual(mockWakeupBedtime);
    expect(result.current.error).toBeNull();
  });

  it('should handle empty data from the API', async () => {
    const mockEmptyDailySummary = { days: [] };
    const mockTimetable = { slots: [] };
    const mockWakeupBedtime = { days: [] };

    vi.mocked(api.fetchDailySummary).mockResolvedValueOnce(mockEmptyDailySummary);
    vi.mocked(api.fetchTimetable).mockResolvedValueOnce(mockTimetable);
    vi.mocked(api.fetchWakeSleepTimes).mockResolvedValueOnce(mockWakeupBedtime);

    const { result } = renderHook(() => useStats('2024-01-01', '2024-01-02'), { wrapper });

    await waitFor(() => expect(result.current.isLoading).toBe(false));

    expect(result.current.dailySummary).toEqual(mockEmptyDailySummary);
    expect(result.current.transformedDailySummary).toEqual([]);
    expect(result.current.error).toBeNull();
  });

  it('should handle error state when the API request fails', async () => {
    const error = new Error('API Failure');
    vi.mocked(api.fetchDailySummary).mockRejectedValueOnce(error);
    vi.mocked(api.fetchTimetable).mockResolvedValueOnce({ slots: [] });
    vi.mocked(api.fetchWakeSleepTimes).mockResolvedValueOnce({ days: [] });

    const { result } = renderHook(() => useStats('2024-01-01', '2024-01-02'), { wrapper });

    await waitFor(() => expect(result.current.isLoading).toBe(false));

    expect(result.current.error).toBeDefined();
    expect(result.current.error).toEqual(error);
  });

  it('should handle loading state transitions', async () => {
    let resolvePromise: (value: any) => void;
    const pendingPromise = new Promise((resolve) => {
      resolvePromise = resolve;
    });

    vi.mocked(api.fetchDailySummary).mockReturnValueOnce(pendingPromise as any);
    vi.mocked(api.fetchTimetable).mockResolvedValueOnce({ slots: [] });
    vi.mocked(api.fetchWakeSleepTimes).mockResolvedValueOnce({ days: [] });

    const { result } = renderHook(() => useStats('2024-01-01', '2024-01-02'), { wrapper });

    // Should be loading while promise is pending
    expect(result.current.isLoading).toBe(true);

    // Resolve the promise
    resolvePromise!({ days: [] });

    await waitFor(() => expect(result.current.isLoading).toBe(false));
  });
});

describe('useSummary', () => {
  const wrapper = ({ children }: { children: React.ReactNode }) => (
    <QueryClientProvider client={createTestQueryClient()}>
      {children}
    </QueryClientProvider>
  );

  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should return data on success', async () => {
    const mockSummary = {
      total_sleeps: 10,
      avg_sleeps_per_day: 2,
      total_sleeps_all_time: 100,
      avg_sleeps_per_day_all_time: 2.5,
    };
    vi.mocked(api.fetchSummary).mockResolvedValueOnce(mockSummary);

    const { result } = renderHook(() => useSummary('2024-01-01', '2024-01-02'), { wrapper });

    await waitFor(() => expect(result.current.isSuccess).toBe(true));

    expect(result.current.data).toEqual(mockSummary);
    expect(api.fetchSummary).toHaveBeenCalledWith('2024-01-01', '2024-01-02');
  });

  it('should handle error on failure', async () => {
    const error = new Error('API Failure');
    vi.mocked(api.fetchSummary).mockRejectedValueOnce(error);

    const { result } = renderHook(() => useSummary('2024-01-01', '2024-01-02'), { wrapper });

    await waitFor(() => expect(result.current.isError).toBe(true));

    expect(result.current.error).toEqual(error);
  });
});