import { Node } from 'prosemirror-model';
import { describe, expect, it } from 'vitest';

import { docToHtml } from './html';
import { docToMarkdown, markdownToDoc } from './markdown';
import { extractWikilinkSlugs } from './wikilinks';

function firstTransclusion(doc: Node): Node | null {
  let found: Node | null = null;
  doc.descendants((node) => {
    if (!found && node.type.name === 'transclusion') found = node;
  });
  return found;
}

describe('page embed / transclusion (issue #135)', () => {
  it('parses a lone ![[slug]] line to a transclusion block and round-trips', () => {
    const doc = markdownToDoc('Intro\n\n![[rennrad]]\n\nOutro');
    const node = firstTransclusion(doc);
    expect(node).not.toBeNull();
    expect(node!.attrs.targetSlug).toBe('rennrad');
    expect(node!.attrs.displayText).toBeNull();
    expect(docToMarkdown(doc)).toContain('![[rennrad]]');
  });

  it('supports optional display text and round-trips it', () => {
    const doc = markdownToDoc('![[rennrad|Mein Rad]]');
    const node = firstTransclusion(doc);
    expect(node!.attrs.targetSlug).toBe('rennrad');
    expect(node!.attrs.displayText).toBe('Mein Rad');
    expect(docToMarkdown(doc).trim()).toBe('![[rennrad|Mein Rad]]');
  });

  it('renders a placeholder div carrying the slug', () => {
    const doc = markdownToDoc('![[rennrad]]');
    const html = docToHtml(doc);
    expect(html).toContain('class="dt-transclusion"');
    expect(html).toContain('data-transclusion="rennrad"');
  });

  it('registers the embed target as an outgoing link (backlinks/graph)', () => {
    const doc = markdownToDoc('![[rennrad]]\n\n[[dota]]');
    expect(extractWikilinkSlugs(doc)).toEqual(['rennrad', 'dota']);
  });

  it('only embeds a lone line — mid-paragraph ![[x]] is not a transclusion', () => {
    const doc = markdownToDoc('see ![[rennrad]] inline');
    expect(firstTransclusion(doc)).toBeNull();
  });
});

describe('bare page embed `$[[…]]` (issue #146)', () => {
  it('parses a lone $[[slug]] line to a bare transclusion and round-trips', () => {
    const doc = markdownToDoc('Intro\n\n$[[rennrad]]\n\nOutro');
    const node = firstTransclusion(doc);
    expect(node).not.toBeNull();
    expect(node!.attrs.targetSlug).toBe('rennrad');
    expect(node!.attrs.bare).toBe(true);
    expect(docToMarkdown(doc)).toContain('$[[rennrad]]');
  });

  it('keeps `![[…]]` non-bare and round-trips both prefixes side by side', () => {
    const doc = markdownToDoc('![[dota]]\n\n$[[rennrad]]');
    const markdown = docToMarkdown(doc);
    expect(markdown).toContain('![[dota]]');
    expect(markdown).toContain('$[[rennrad]]');
    let bares = 0;
    doc.descendants((node) => {
      if (node.type.name === 'transclusion' && node.attrs.bare) bares += 1;
    });
    expect(bares).toBe(1);
  });

  it('marks the placeholder div so the server expansion can drop the frame', () => {
    const html = docToHtml(markdownToDoc('$[[rennrad]]'));
    expect(html).toContain('data-transclusion="rennrad"');
    expect(html).toContain('data-transclusion-bare="1"');
    // The framed variant must NOT carry the marker.
    expect(docToHtml(markdownToDoc('![[rennrad]]'))).not.toContain('data-transclusion-bare');
  });

  it('registers the bare embed target as an outgoing link too', () => {
    const doc = markdownToDoc('$[[rennrad]]');
    expect(extractWikilinkSlugs(doc)).toEqual(['rennrad']);
  });

  it('does not treat mid-paragraph $[[x]] as a transclusion', () => {
    const doc = markdownToDoc('costs $[[rennrad]] inline');
    expect(firstTransclusion(doc)).toBeNull();
  });
});