import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest';
import { render, screen, fireEvent, waitFor, cleanup } from '@testing-library/svelte';

vi.mock('../lib/client', () => {
  const real = vi.importActual<typeof import('../lib/client')>('../lib/client');
  return {
    ...real,
    getDataset: vi.fn(),
    getDatasetPreview: vi.fn(),
    createDataset: vi.fn()
  };
});

import DatasetCard from '../components/DatasetCard.svelte';
import { getDataset, createDataset } from '../lib/client';
import type { Dataset } from '../lib/types';

const failedDs: Dataset = {
  id: 'ds-failed-1',
  name: '国泰自由现金流-20251231-20260917',
  request: {
    name: '国泰自由现金流-20251231-20260917',
    instruments: [
      { symbol: '159399', market: 'SZ', asset_type: 'etf', name: '国泰自由现金流', currency: null }
    ],
    start_date: '2025-12-31',
    end_date: '2026-09-17',
    frequency: 'daily',
    adjustment: 'none',
    fields: ['open', 'high', 'low', 'close', 'volume']
  },
  status: 'failed',
  error: '159399: eastmoney failed (RemoteDisconnected); tencent fallback failed (tencent source has no listed-ETF daily adapter)',
  created_at: '2026-09-17T01:00:00Z'
};

beforeEach(() => {
  vi.mocked(getDataset).mockResolvedValue(failedDs);
  vi.mocked(createDataset).mockReset();
});

afterEach(() => cleanup());

describe('failed dataset retry affordance (159399 regression: user could never re-request)', () => {
  it('failed dataset offers recreate-with-same-request button and original error stays visible', async () => {
    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
    await screen.findByText(/eastmoney failed/);
    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
    expect(btn).toBeTruthy();
  });

  it('recreate preserves ds.name (canonical request has no name) via the normal create API and keeps the failed record untouched', async () => {
    vi.mocked(createDataset).mockResolvedValue({
      ...failedDs,
      id: 'ds-new-2',
      status: 'pending',
      error: null
    });
    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
    await fireEvent.click(btn);
    await waitFor(() => {
      expect(createDataset).toHaveBeenCalledTimes(1);
    });
    expect(vi.mocked(createDataset).mock.calls[0][0]).toStrictEqual({
      ...failedDs.request,
      name: failedDs.name,
      instruments: [{ ...failedDs.request.instruments[0], currency: null }]
    });
    // new dataset becomes visible/trackable: hint points to the list below
    await screen.findByText(/新数据集出现在下方列表并自动跟踪进度/);
  });

  it('recreate button is disabled after a successful recreate (no duplicate submissions), error clears button state instead', async () => {
    vi.mocked(createDataset).mockResolvedValue({
      ...failedDs,
      id: 'ds-new-3',
      status: 'pending',
      error: null
    });
    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
    expect((btn as HTMLButtonElement).disabled).toBe(false);
    await fireEvent.click(btn);
    await screen.findByText(/已用原请求创建新数据集/);
    const done = screen.getByRole('button', { name: /使用相同请求重新获取/ });
    expect((done as HTMLButtonElement).disabled).toBe(true);
  });

  it('onRecreated callback fires with the new dataset so parents can refresh', async () => {
    vi.mocked(createDataset).mockResolvedValue({
      ...failedDs,
      id: 'ds-new-4',
      status: 'pending',
      error: null
    });
    const onRecreated = vi.fn();
    render(DatasetCard, { props: { dsId: 'ds-failed-1', onRecreated } });
    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
    await fireEvent.click(btn);
    await screen.findByText(/已用原请求创建新数据集/);
    expect(onRecreated).toHaveBeenCalledTimes(1);
    expect(onRecreated.mock.calls[0][0].id).toBe('ds-new-4');
  });

  it('recreate failure surfaces the error message instead of a silent no-op', async () => {
    vi.mocked(createDataset).mockRejectedValue(new Error('HTTP400: validation'));
    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
    await fireEvent.click(btn);
    await screen.findByText(/重新获取失败/);
  });
});