// @vitest-environment jsdom
// figureLayout.test.js —— 聊天图片布局纯函数（2026-09-01 修订版）
// 需求：单图 50% 宽；只要是连续两张图片就并排一行各 50%（不做比例相同限制）。
import { describe, it, expect } from 'vitest';
import { pairFigures, isInlineAdjacent, layoutTextRoot } from '../../../../ui/src/components/chat/figureLayout.js';

const fig = () => document.createElement('figure');

describe('pairFigures 按 2 分块配对', () => {
  const figs = [fig(), fig(), fig(), fig(), fig()];
  it('2 张 → 1 对', () => {
    const g = pairFigures([figs[0], figs[1]]);
    expect(g).toHaveLength(1);
    expect(g[0].row).toBe(true);
    expect(g[0].figures).toEqual([figs[0], figs[1]]);
  });
  it('3 张 → 1 对 + 1 单（连续即配对，不论比例）', () => {
    const g = pairFigures([figs[0], figs[1], figs[2]]);
    expect(g).toHaveLength(2);
    expect(g[0].row).toBe(true);
    expect(g[1].row).toBe(false);
    expect(g[1].figures).toEqual([figs[2]]);
  });
  it('5 张 → 2 对 + 1 单', () => {
    const g = pairFigures(figs);
    expect(g).toHaveLength(3);
    expect(g.map((x) => x.row)).toEqual([true, true, false]);
  });
  it('空列表', () => {
    expect(pairFigures([])).toEqual([]);
  });
});

describe('isInlineAdjacent 连续性', () => {
  it('同一 <p> 内仅空白相隔 → 相邻', () => {
    const p = document.createElement('p');
    const a = fig();
    const b = fig();
    p.append(a, document.createTextNode(' '), b);
    expect(isInlineAdjacent(a, b)).toBe(true);
  });
  it('相邻兄弟 <p> → 相邻（markdown-it 逐图成段）', () => {
    const wrap = document.createElement('div');
    const pa = document.createElement('p');
    const pb = document.createElement('p');
    pa.append(fig());
    pb.append(fig());
    wrap.append(pa, pb);
    expect(isInlineAdjacent(pa.firstChild, pb.firstChild)).toBe(true);
  });
  it('HTML 解析器把 figure 提出 p 留下的空 <p> 视为空白 → 相邻', () => {
    const wrap = document.createElement('div');
    const a = fig();
    const emptyP = document.createElement('p');
    const b = fig();
    wrap.append(a, emptyP, b);
    expect(isInlineAdjacent(a, b)).toBe(true);
  });
  it('中间有文字段落 → 不相邻', () => {
    const wrap = document.createElement('div');
    const pa = document.createElement('p');
    const pm = document.createElement('p');
    const pb = document.createElement('p');
    pa.append(fig());
    pm.textContent = '说明文字';
    pb.append(fig());
    wrap.append(pa, pm, pb);
    expect(isInlineAdjacent(pa.firstChild, pb.firstChild)).toBe(false);
  });
});

describe('layoutTextRoot 幂等布局', () => {
  function makeRoot(html) {
    const root = document.createElement('div');
    root.className = 'md-text';
    root.innerHTML = html;
    return root;
  }
  it('单图 → half 类，无 row', () => {
    const root = makeRoot('<p><figure class="md-figure"><img></figure></p>');
    layoutTextRoot(root);
    expect(root.querySelectorAll('.figure-row').length).toBe(0);
    expect(root.querySelector('.md-figure').classList.contains('half')).toBe(true);
  });
  it('连续两张（任意比例）→ 一个 figure-row，无 half', () => {
    const root = makeRoot(
      '<p><figure class="md-figure"><img></figure></p><p><figure class="md-figure"><img></figure></p>'
    );
    layoutTextRoot(root);
    expect(root.querySelectorAll('.figure-row').length).toBe(1);
    const row = root.querySelector('.figure-row');
    expect(row.children.length).toBe(2);
    expect(root.querySelectorAll('.md-figure.half').length).toBe(0);
  });
  it('3 张连续 → 1 对 + 1 单', () => {
    const root = makeRoot(
      '<p><figure class="md-figure"><img></figure></p><p><figure class="md-figure"><img></figure></p><p><figure class="md-figure"><img></figure></p>'
    );
    layoutTextRoot(root);
    expect(root.querySelectorAll('.figure-row').length).toBe(1);
    expect(root.querySelectorAll('.md-figure.half').length).toBe(1);
  });
  it('中间夹文字段落的双图 → 各自 half，无 row', () => {
    const root = makeRoot(
      '<p><figure class="md-figure"><img></figure></p><p>分隔文字</p><p><figure class="md-figure"><img></figure></p>'
    );
    layoutTextRoot(root);
    expect(root.querySelectorAll('.figure-row').length).toBe(0);
    expect(root.querySelectorAll('.md-figure.half').length).toBe(2);
  });
  it('重复调用幂等（重排前拆旧 row / 清 half）', () => {
    const root = makeRoot(
      '<p><figure class="md-figure"><img></figure></p><p><figure class="md-figure"><img></figure></p>'
    );
    layoutTextRoot(root);
    expect(root.querySelectorAll('.figure-row').length).toBe(1);
    layoutTextRoot(root);
    expect(root.querySelectorAll('.figure-row').length).toBe(1);
    expect(root.querySelectorAll('.md-figure.half').length).toBe(0);
  });
  it('display:none 的失败图不参与布局', () => {
    const root = makeRoot(
      '<p><figure class="md-figure" style="display:none"><img></figure></p><p><figure class="md-figure"><img></figure></p><p><figure class="md-figure"><img></figure></p>'
    );
    layoutTextRoot(root);
    // 隐藏图被跳过，剩余两张可见图并排
    expect(root.querySelectorAll('.figure-row').length).toBe(1);
    expect(root.querySelectorAll('.md-figure.half').length).toBe(0);
  });
});