import { describe, it, expect } from 'vitest';
import { splitFrontmatter, joinFrontmatter } from '../../apps/desktop/src/main/safe/frontmatter-codec';
import type { DocMeta } from '@hunter/shared';

describe('splitFrontmatter', () => {
  it('无 frontmatter 的纯 Markdown', () => {
    const { meta, body } = splitFrontmatter('# 标题\n正文');
    expect(meta).toEqual({});
    expect(body).toBe('# 标题\n正文');
  });
  it('解析四字段', () => {
    const raw = '---\ntitle: 我的标题\ntags: [a, b]\nstar: true\nlinks: [x/y.md]\n---\n# 正文';
    const { meta, body } = splitFrontmatter(raw);
    expect(meta).toEqual<DocMeta>({ title: '我的标题', tags: ['a','b'], star: true, links: ['x/y.md'] });
    expect(body).toBe('# 正文');
  });
  it('块式 YAML 列表（多行 - item）', () => {
    const raw = '---\ntitle: 标题\nlinks:\n  - a.md\n  - b.md\ntags:\n  - x\n  - y\n---\n# 正文';
    const { meta, body } = splitFrontmatter(raw);
    expect(meta.links).toEqual(['a.md', 'b.md']);
    expect(meta.tags).toEqual(['x', 'y']);
    expect(meta.title).toBe('标题');
    expect(body).toBe('# 正文');
  });
  it('块式列表后紧跟其他字段', () => {
    const raw = '---\nlinks:\n  - a.md\nstar: true\n---\n# B';
    const { meta } = splitFrontmatter(raw);
    expect(meta.links).toEqual(['a.md']);
    expect(meta.star).toBe(true);
  });
  it('带引号的值', () => {
    const { meta } = splitFrontmatter('---\ntitle: "含: 冒号"\n---\n');
    expect(meta.title).toBe('含: 冒号');
  });
  it('空数组与 false 不解析为有值', () => {
    const { meta } = splitFrontmatter('---\ntags: []\nstar: false\n---\n');
    expect(meta.tags).toEqual([]);
    expect(meta.star).toBe(false);
  });
});

describe('joinFrontmatter (FR-M2 精简)', () => {
  it('空 meta 不写围栏', () => {
    expect(joinFrontmatter({}, '# 正文')).toBe('# 正文');
  });
  it('默认值不落盘：star:false / 空数组', () => {
    const out = joinFrontmatter({ star: false, tags: [], links: [] }, 'body');
    expect(out).toBe('body');
  });
  it('star:true 落盘', () => {
    const out = joinFrontmatter({ star: true }, 'body');
    expect(out).toContain('star: true');
  });
  it('含特殊字符的标题加引号', () => {
    const out = joinFrontmatter({ title: 'a:b#c' }, 'body');
    expect(out).toContain('title: "a:b#c"');
  });
  it('往返：解析后再序列化保持等价', () => {
    const raw = '---\ntitle: T\ntags: [x, y]\nstar: true\n---\n# H\n正文';
    const { meta, body } = splitFrontmatter(raw);
    const out = joinFrontmatter(meta, body);
    const again = splitFrontmatter(out);
    expect(again.meta).toEqual(meta);
    expect(again.body).toBe(body);
  });
});