// @vitest-environment jsdom
import { fireEvent, render, screen, within } from '@testing-library/react';
import { beforeAll, describe, expect, it, vi } from 'vitest';

import { computeTemplateGridLayout } from '../src/features/template-library/templateLibraryGrid';
import type {
  GameTemplateEntry,
  TemplateLibraryFilters,
} from '../src/features/template-library/templateLibraryModel';
import {
  collectGameTemplateTags,
  EMPTY_TEMPLATE_LIBRARY_FILTERS,
  filterGameTemplates,
} from '../src/features/template-library/templateLibraryModel';
import type { TemplateLibraryController } from '../src/features/template-library/useTemplateLibrary';
import TemplateRecommendations from '../src/view/home/TemplateRecommendations';
import TemplateLibraryView from '../src/view/template-library';

const OSS_BASE = 'https://agc-dev.oss-rg-china-mainland.aliyuncs.com';

function template(
  overrides: Partial<GameTemplateEntry> & Pick<GameTemplateEntry, 'id'>,
): GameTemplateEntry {
  return {
    title: '未命名模板',
    summary: '',
    tags: [],
    runtime: 'html',
    engine: 'phaser',
    engineVersion: '4.2.1',
    templateVersion: '0.1.0',
    updatedAt: '2026-09-17T00:00:00Z',
    entry: 'game/index.html',
    zipUrl: `${OSS_BASE}/templates/v1/${overrides.id}/template.zip`,
    zipSizeBytes: 2048,
    zipSha256: 'a'.repeat(64),
    coverUrl: `${OSS_BASE}/templates/v1/${overrides.id}/cover.svg`,
    coverWidth: 960,
    coverHeight: 540,
    installed: false,
    installedVersion: null,
    installedAtMillis: null,
    ...overrides,
  };
}

const blankWeb = template({
  id: 'blank-web',
  title: '空白网页工程',
  summary: '零依赖最小网页工程',
  tags: ['空白', '网页'],
  engine: 'none',
  engineVersion: '',
  installed: true,
  installedVersion: '0.1.0',
  installedAtMillis: 1789000000000,
});
const blankCanvas = template({
  id: 'blank-2d-canvas',
  title: '空白二维画布工程',
  tags: ['空白', '2d', 'canvas'],
  engine: 'canvas',
  engineVersion: '',
});
const templates = [blankCanvas, blankWeb];

function controller(
  overrides: Partial<TemplateLibraryController> = {},
): TemplateLibraryController {
  const filters: TemplateLibraryFilters = {
    query: '',
    tags: [],
    runtime: '',
    installedOnly: false,
  };
  return {
    snapshot: null,
    status: 'ready',
    error: '',
    notice: '',
    templates,
    visibleTemplates: templates,
    tagOptions: ['空白', '2d', 'canvas', '网页'],
    runtimeOptions: ['html'],
    installedCount: 1,
    filters,
    filtersActive: false,
    setQuery: vi.fn(),
    selectRuntime: vi.fn(),
    toggleTag: vi.fn(),
    setInstalledOnly: vi.fn(),
    clearFilters: vi.fn(),
    busyTemplateId: null,
    busyKind: null,
    refresh: vi.fn(),
    downloadTemplate: vi.fn(async () => undefined),
    createProjectFromTemplate: vi.fn(async () => undefined),
    clearNotice: vi.fn(),
    ...overrides,
  } as unknown as TemplateLibraryController;
}

function cardFor(title: string): HTMLElement {
  const heading = screen.getByText(title);
  const card = heading.closest('article');
  if (!card) throw new Error(`找不到卡片：${title}`);
  return card;
}

// 虚拟列表需要可测量的视口：jsdom 没有布局，这里给网格容器固定尺寸并补 ResizeObserver/scrollTo。
const GRID_VIEWPORT = { width: 1200, height: 800 };

beforeAll(() => {
  const originalGetBoundingClientRect = Element.prototype.getBoundingClientRect;
  Element.prototype.getBoundingClientRect = function getBoundingClientRect() {
    const element = this as HTMLElement;
    if (element.dataset?.templateGridViewport === 'true') {
      return {
        width: GRID_VIEWPORT.width,
        height: GRID_VIEWPORT.height,
        top: 0,
        left: 0,
        right: GRID_VIEWPORT.width,
        bottom: GRID_VIEWPORT.height,
        x: 0,
        y: 0,
        toJSON: () => ({}),
      } as DOMRect;
    }
    return originalGetBoundingClientRect.call(this);
  };
  if (typeof Element.prototype.scrollTo !== 'function') {
    Element.prototype.scrollTo = () => undefined;
  }
  class ResizeObserverStub {
    observe() {}
    unobserve() {}
    disconnect() {}
  }
  vi.stubGlobal('ResizeObserver', ResizeObserverStub);
});

describe('TemplateLibraryView', () => {
  it('renders a card per template with cover, meta, tags and installed badge', () => {
    render(<TemplateLibraryView controller={controller()} onBack={() => {}} />);

    expect(screen.getByRole('heading', { name: '模板库' })).toBeTruthy();
    expect(screen.getByText('共 2 个模板 · 已下载 1 个')).toBeTruthy();

    const blankWebCard = cardFor('空白网页工程');
    const cover = blankWebCard.querySelector('img');
    expect(cover?.getAttribute('src')).toBe(
      `${OSS_BASE}/templates/v1/blank-web/cover.svg`,
    );
    expect(blankWebCard.textContent).toContain('已下载');
    expect(blankWebCard.textContent).toContain('网页 · none · v0.1.0 · 2.0 KB');
    expect(blankWebCard.textContent).toContain('空白');
    expect(blankWebCard.textContent).toContain('零依赖最小网页工程');
    // 已下载且版本一致：不再显示下载入口，只留「使用模板」。
    expect(
      within(blankWebCard).queryByRole('button', { name: /下载/ }),
    ).toBeNull();
    expect(
      within(blankWebCard).getByRole('button', { name: /使用模板/ }),
    ).toBeTruthy();

    const blankCanvasCard = cardFor('空白二维画布工程');
    expect(blankCanvasCard.textContent).not.toContain('已下载');
    expect(blankCanvasCard.querySelector('img')?.getAttribute('src')).toBe(
      `${OSS_BASE}/templates/v1/blank-2d-canvas/cover.svg`,
    );
    expect(
      within(blankCanvasCard).getByRole('button', { name: /下载/ }),
    ).toBeTruthy();
  });

  it('keeps the launcher theme contract and owns its own scroll viewport', () => {
    // 回归点：`.launcher-main` 只给带 platform-theme 的直接子元素 height:100%；
    // 卡片列表改由虚拟网格自己的视口滚动（整页不再随模板数量变长）。
    const { container } = render(
      <TemplateLibraryView controller={controller()} onBack={() => {}} />,
    );
    const page = container.querySelector('section[aria-label="模板库"]');
    expect(page?.className).toContain('platform-theme');
    const viewport = container.querySelector(
      '[data-template-grid-viewport="true"]',
    );
    expect(viewport).not.toBeNull();
    expect(viewport?.querySelector('article')).not.toBeNull();
  });

  it('offers 更新 instead of 下载 when the installed version is stale', () => {
    const stale = template({
      id: 'blank-web',
      title: '空白网页工程',
      summary: '零依赖最小网页工程',
      tags: ['空白', '网页'],
      installed: true,
      installedVersion: '0.0.9',
      installedAtMillis: 1789000000000,
    });
    render(
      <TemplateLibraryView
        controller={controller({
          templates: [stale],
          visibleTemplates: [stale],
        })}
        onBack={() => {}}
      />,
    );

    const card = cardFor('空白网页工程');
    expect(within(card).getByRole('button', { name: /更新/ })).toBeTruthy();
    expect(within(card).queryByRole('button', { name: /^下载/ })).toBeNull();
  });

  it('routes search, tag, runtime and installed-only controls through the controller', () => {
    const setQuery = vi.fn();
    const toggleTag = vi.fn();
    const selectRuntime = vi.fn();
    const setInstalledOnly = vi.fn();
    const clearFilters = vi.fn();
    render(
      <TemplateLibraryView
        controller={controller({
          setQuery,
          toggleTag,
          selectRuntime,
          setInstalledOnly,
          clearFilters,
          filtersActive: true,
        })}
        onBack={() => {}}
      />,
    );

    fireEvent.change(screen.getByLabelText('搜索模板'), {
      target: { value: '空白 网页' },
    });
    expect(setQuery).toHaveBeenCalledWith('空白 网页');

    fireEvent.click(screen.getByRole('button', { name: '标签筛选 canvas' }));
    expect(toggleTag).toHaveBeenCalledWith('canvas');

    fireEvent.click(screen.getByRole('button', { name: '运行时筛选 网页' }));
    expect(selectRuntime).toHaveBeenCalledWith('html');

    fireEvent.click(screen.getByRole('button', { name: '仅看已下载' }));
    expect(setInstalledOnly).toHaveBeenCalledWith(true);

    fireEvent.click(screen.getByRole('button', { name: '清除筛选' }));
    expect(clearFilters).toHaveBeenCalled();
  });

  it('starts a download and a template project from the card actions', () => {
    const downloadTemplate = vi.fn(async () => undefined);
    const createProjectFromTemplate = vi.fn(async () => undefined);
    render(
      <TemplateLibraryView
        controller={controller({ downloadTemplate, createProjectFromTemplate })}
        onBack={() => {}}
      />,
    );

    fireEvent.click(
      within(cardFor('空白二维画布工程')).getByRole('button', { name: /下载/ }),
    );
    expect(downloadTemplate).toHaveBeenCalledWith(blankCanvas);

    fireEvent.click(
      within(cardFor('空白二维画布工程')).getByRole('button', {
        name: /使用模板/,
      }),
    );
    expect(createProjectFromTemplate).toHaveBeenCalledWith(blankCanvas);
  });

  it('disables card actions while a template is busy', () => {
    render(
      <TemplateLibraryView
        controller={controller({
          busyTemplateId: 'blank-2d-canvas',
          busyKind: 'create',
        })}
        onBack={() => {}}
      />,
    );

    const busyCard = cardFor('空白二维画布工程');
    const buttons = Array.from(busyCard.querySelectorAll('button'));
    expect(buttons.every((button) => button.hasAttribute('disabled'))).toBe(
      true,
    );
    expect(busyCard.textContent).toContain('正在创建项目');
    expect(cardFor('空白网页工程').textContent).not.toContain('正在创建项目');
  });

  it('shows empty, no-match, error and notice states', () => {
    const { unmount } = render(
      <TemplateLibraryView
        controller={controller({
          templates: [],
          visibleTemplates: [],
          installedCount: 0,
        })}
        onBack={() => {}}
      />,
    );
    expect(screen.getByText('模板库暂时还没有可用的模板。')).toBeTruthy();
    unmount();

    const { unmount: unmountNoMatch } = render(
      <TemplateLibraryView
        controller={controller({ visibleTemplates: [], filtersActive: true })}
        onBack={() => {}}
      />,
    );
    expect(screen.getByText('没有符合当前筛选的模板')).toBeTruthy();
    unmountNoMatch();

    render(
      <TemplateLibraryView
        controller={controller({
          error: '模板库返回 HTTP 503',
          notice: '远端清单暂时读不到，当前展示本机缓存',
        })}
        onBack={() => {}}
      />,
    );
    expect(screen.getByRole('alert').textContent).toContain(
      '模板库返回 HTTP 503',
    );
    expect(
      screen.getByText('远端清单暂时读不到，当前展示本机缓存'),
    ).toBeTruthy();
  });

  it('renders process notices as a floating toast outside the page and auto-dismisses it', () => {
    vi.useFakeTimers();
    const clearNotice = vi.fn();
    try {
      const { container } = render(
        <TemplateLibraryView
          controller={controller({
            notice: '已下载模板「空白网页工程」',
            clearNotice,
          })}
          onBack={() => {}}
        />,
      );

      const toast = document.body.querySelector(
        '[data-template-library-toast="true"]',
      );
      expect(toast).not.toBeNull();
      expect(toast?.textContent).toContain('已下载模板「空白网页工程」');
      expect(toast?.querySelector('[role="status"]')?.textContent).toContain(
        '已下载模板「空白网页工程」',
      );
      // 提示不再占用页面内位置。
      expect(
        container.querySelector('[data-template-library-toast]'),
      ).toBeNull();

      vi.advanceTimersByTime(2600);
      expect(clearNotice).toHaveBeenCalledTimes(1);
    } finally {
      vi.useRealTimers();
    }
  });
});

describe('大库量渲染（1000 条假数据）', () => {
  const bulk = Array.from({ length: 1000 }, (_, index) =>
    template({
      id: `bulk-${index}`,
      title: `批量模板 ${index}`,
      summary: '压测条目',
      tags: ['起步工程', `批次-${String(index % 20).padStart(2, '0')}`],
      installed: index % 3 === 0,
      installedVersion: index % 3 === 0 ? '0.1.0' : null,
    }),
  );

  it('virtualizes a 1000 entries library instead of rendering every card', () => {
    const { container } = render(
      <TemplateLibraryView
        controller={controller({
          templates: bulk,
          visibleTemplates: bulk,
          installedCount: bulk.filter((entry) => entry.installed).length,
          tagOptions: collectGameTemplateTags(bulk),
        })}
        onBack={() => {}}
      />,
    );

    // 虚拟列表只渲染可视区域（1200×800 视口 → 4 列 × 约 3 行 + 2 行 overscan）。
    const renderedCards = container.querySelectorAll('article').length;
    expect(renderedCards).toBeGreaterThan(0);
    expect(renderedCards).toBeLessThanOrEqual(40);
    expect(screen.getByText('共 1000 个模板 · 已下载 334 个')).toBeTruthy();
    // 滚动高度仍按全部行数计算。
    const layout = computeTemplateGridLayout({
      containerWidth: GRID_VIEWPORT.width,
      itemCount: bulk.length,
    });
    expect(layout.columnCount).toBe(4);
    expect(layout.rowCount).toBe(250);
    const totalHeight = `${250 * layout.rowHeight}px`;
    const hasSpacer = Array.from(container.querySelectorAll('div')).some(
      (element) => (element as HTMLElement).style.height === totalHeight,
    );
    expect(hasSpacer).toBe(true);
    // 标签筛选条会随库量膨胀，这里先记录当前聚合出来的规模（1000 条 × 批次标签）。
    const tagButtons = screen
      .getAllByRole('button')
      .filter((button) =>
        button.getAttribute('aria-label')?.startsWith('标签筛选'),
      );
    expect(tagButtons.length).toBeGreaterThan(20);

    // 纯前端筛选在大库量下仍然是 O(n) 的一遍过滤，数量与已安装态自洽。
    const installedOnly = filterGameTemplates(bulk, {
      ...EMPTY_TEMPLATE_LIBRARY_FILTERS,
      installedOnly: true,
    });
    expect(installedOnly).toHaveLength(334);
    expect(
      filterGameTemplates(bulk, {
        ...EMPTY_TEMPLATE_LIBRARY_FILTERS,
        tags: ['批次-07'],
      }),
    ).toHaveLength(50);
    expect(
      filterGameTemplates(bulk, {
        ...EMPTY_TEMPLATE_LIBRARY_FILTERS,
        query: '批量模板 999',
      }).map((entry) => entry.id),
    ).toEqual(['bulk-999']);
  });
});

describe('TemplateRecommendations', () => {
  it('renders the recommended templates and opens the library', () => {
    const onOpenLibrary = vi.fn();
    render(
      <TemplateRecommendations
        templates={templates}
        loading={false}
        error=""
        onOpenLibrary={onOpenLibrary}
      />,
    );

    const recommendation = screen.getByRole('button', {
      name: '查看模板 空白网页工程',
    });
    expect(recommendation.querySelector('img')?.getAttribute('src')).toBe(
      `${OSS_BASE}/templates/v1/blank-web/cover.svg`,
    );
    expect(recommendation.textContent).toContain('已下载');
    fireEvent.click(recommendation);
    expect(onOpenLibrary).toHaveBeenCalled();
  });

  it('falls back to an empty state with a library entry', () => {
    const onOpenLibrary = vi.fn();
    render(
      <TemplateRecommendations
        templates={[]}
        loading={false}
        error="需要在陶泥儿客户端内运行"
        onOpenLibrary={onOpenLibrary}
      />,
    );

    expect(screen.getByText('需要在陶泥儿客户端内运行')).toBeTruthy();
    fireEvent.click(screen.getByRole('button', { name: '打开模板库' }));
    expect(onOpenLibrary).toHaveBeenCalled();
  });

  it('renders a loading state before the first snapshot arrives', () => {
    render(
      <TemplateRecommendations
        templates={[]}
        loading
        error=""
        onOpenLibrary={() => {}}
      />,
    );
    expect(screen.getByText('正在读取模板库…')).toBeTruthy();
  });
});