import { describe, expect, it } from 'vitest';

import {
  createResourceCanvasPageCategorySignature,
  createResourceCanvasPrefetchScopeKey,
} from '../src/view/project-development/resourceCanvasController';

describe('resource canvas page wheel controller', () => {
  it('invalidates page categories for same-count category changes without reacting to resource order', () => {
    const original = [{ category: 'document' }, { category: 'scene' }];
    const reordered = [...original].reverse();
    const changed = [{ category: 'document' }, { category: 'audio' }];

    expect(createResourceCanvasPageCategorySignature(reordered)).toBe(
      createResourceCanvasPageCategorySignature(original),
    );
    expect(createResourceCanvasPageCategorySignature(changed)).not.toBe(
      createResourceCanvasPageCategorySignature(original),
    );
  });
});

describe('资源画布预取作用域标识', () => {
  /**
   * 标识必须由**视图身份**算出：喂给预览 Hook 的资源集合是全量投影，换栏目一字不改，
   * 因此"资源 id 签名"做不到区分视图 —— 用它当标识会让取消上一视图排队预取永不触发。
   */
  it('changes for every view identity change that a resource-set signature cannot see', () => {
    const childScene = createResourceCanvasPrefetchScopeKey({
      view: 'child',
      target: 'scene',
      mode: 'dependency',
    });

    // 换栏目：同一批全量资源下的两个不同视图，标识必须不同。
    expect(
      createResourceCanvasPrefetchScopeKey({
        view: 'child',
        target: 'character',
        mode: 'dependency',
      }),
    ).not.toBe(childScene);
    // 换视图：栏目页 → 总览。
    expect(
      createResourceCanvasPrefetchScopeKey({
        view: 'main',
        target: null,
        mode: 'dependency',
      }),
    ).not.toBe(childScene);
    // 同一栏目内换排序模式：卡片整体重排，对用户就是换了一次视图。
    expect(
      createResourceCanvasPrefetchScopeKey({
        view: 'child',
        target: 'scene',
        mode: 'type',
      }),
    ).not.toBe(childScene);
  });

  it('stays stable for an unchanged view so unrelated renders never cancel prefetches', () => {
    expect(
      createResourceCanvasPrefetchScopeKey({
        view: 'child',
        target: 'scene',
        mode: 'dependency',
      }),
    ).toBe(
      createResourceCanvasPrefetchScopeKey({
        view: 'child',
        target: 'scene',
        mode: 'dependency',
      }),
    );
  });
});