import { describe, expect, it } from 'vitest';
import type { DockTab } from '../../store/app/appTypes';
import { MAX_DOCK_TABS, upsertDockTab } from './dockTabs';

const tab = (key: string, label = key): DockTab => ({ key, label });

describe('upsertDockTab', () => {
  it('追加新页签', () => {
    expect(upsertDockTab([], '/students', '学生管理')).toEqual([tab('/students', '学生管理')]);
  });

  it('标题未变时保持原引用，避免无谓渲染', () => {
    const tabs = [tab('/students', '学生管理')];
    expect(upsertDockTab(tabs, '/students', '学生管理')).toBe(tabs);
  });

  it('菜单标题变化时更新页签标题', () => {
    const tabs = [tab('/students', '学生管理')];
    expect(upsertDockTab(tabs, '/students', '学生档案')).toEqual([tab('/students', '学生档案')]);
  });

  it('超过上限时保留当前页签 + 最新页签（LRU 淘汰最旧）', () => {
    const tabs = Array.from({ length: MAX_DOCK_TABS }, (_, i) => tab(`/p${i + 1}`));
    const next = upsertDockTab(tabs, '/new', '新页');
    expect(next).toHaveLength(MAX_DOCK_TABS);
    expect(next[0]).toEqual(tab('/new', '新页'));
    expect(next[next.length - 1]).toEqual(tab(`/p${MAX_DOCK_TABS}`));
    expect(next.some((t) => t.key === '/p1')).toBe(false);
  });

  it('恢复持久化的超量页签时压缩到上限，并保留当前页', () => {
    const tabs = Array.from({ length: 25 }, (_, i) => tab(`/p${i + 1}`));
    tabs.push(tab('/wallets', '学生余额'));
    const next = upsertDockTab(tabs, '/wallets', '学生余额');
    expect(next).toHaveLength(MAX_DOCK_TABS);
    expect(next[0]).toEqual(tab('/wallets', '学生余额'));
    expect(next.some((t) => t.key === '/p1')).toBe(false);
    expect(next.some((t) => t.key === '/p6')).toBe(false);
    expect(next.some((t) => t.key === '/p7')).toBe(true);
  });
});