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

import { docToMarkdown, markdownToDoc } from './markdown';

/**
 * Markdown → doc → Markdown must be stable for the node/mark set the
 * schema supports (issue #24 acceptance criterion). Each fixture is
 * expected to serialize back to itself byte-for-byte.
 */
const FIXTURES: Record<string, string> = {
  headings: '# Level one\n\n## Level two\n\n### Level three\n\n#### Level four',

  paragraphInlineMarks:
    'Plain, **bold**, *italic*, ~~strikethrough~~, `code`, and [a link](https://example.org/page).',

  bulletList: '- First item\n- Second item\n- Third item',

  orderedList: '1. First\n2. Second\n3. Third',

  taskList: '- [ ] Buy milk\n- [x] Walk the dog',

  blockquote: '> Quoted paragraph one.\n>\n> Quoted paragraph two.',

  codeBlock: '```\nconst x = 1;\nconsole.log(x);\n```',

  horizontalRule: 'Above\n\n---\n\nBelow',

  table: '| Name | Role |\n| --- | --- |\n| Uma | Editor |\n| Otto | Reader |',

  image: '![A pond](file-123)',

  nestedBlockquoteAndList: '> - Item inside a quote\n> - Second item',

  wikilinkBare: 'See [[architecture]] for details.',

  wikilinkWithDisplay: 'See [[architecture|the design docs]] for details.',
};

describe('markdown round-trip (issue #24)', () => {
  for (const [name, markdown] of Object.entries(FIXTURES)) {
    it(`stabilizes: ${name}`, () => {
      const doc = markdownToDoc(markdown);
      expect(docToMarkdown(doc)).toBe(markdown);
    });
  }

  it('produces the expected document shape for a mixed fixture', () => {
    const doc = markdownToDoc(FIXTURES.paragraphInlineMarks ?? '');
    expect(doc.toJSON()).toMatchObject({
      type: 'doc',
      content: [{ type: 'paragraph' }],
    });
  });

  it('clamps markdown heading levels beyond 4 down to level 4', () => {
    const doc = markdownToDoc('###### Deep heading');
    const heading = doc.firstChild;
    expect(heading?.type.name).toBe('heading');
    expect(heading?.attrs.level).toBe(4);
  });

  it('does not turn a mixed checkbox/plain list into a task list', () => {
    const doc = markdownToDoc('- [ ] Task\n- Plain item');
    expect(doc.firstChild?.type.name).toBe('bullet_list');
  });

  it('parses a wikilink into a node with slug and optional display text (issue #46)', () => {
    const withDisplay = markdownToDoc('[[my-page|My Page]]').firstChild?.firstChild;
    expect(withDisplay?.type.name).toBe('wikilink');
    expect(withDisplay?.attrs).toMatchObject({ targetSlug: 'my-page', displayText: 'My Page' });

    const bare = markdownToDoc('[[my-page]]').firstChild?.firstChild;
    expect(bare?.attrs).toMatchObject({ targetSlug: 'my-page', displayText: null });
  });

  it('leaves malformed brackets as plain text', () => {
    // A single bracket pair is an ordinary (broken) markdown link, not a wikilink.
    const doc = markdownToDoc('[[unclosed and [not a link]');
    expect(doc.textContent).toContain('[[unclosed');
    let hasWikilink = false;
    doc.descendants((n) => {
      if (n.type.name === 'wikilink') hasWikilink = true;
    });
    expect(hasWikilink).toBe(false);
  });

  it('round-trips a section-style container as a fenced div (issue #75)', () => {
    const md = [
      '::: {data-section-style="section-styles-basic/callout"}',
      'Inside the callout.',
      '',
      'Second paragraph.',
      ':::',
    ].join('\n');
    const doc = markdownToDoc(md);
    const section = doc.firstChild;
    expect(section?.type.name).toBe('section');
    expect(section?.attrs).toMatchObject({
      pluginId: 'section-styles-basic',
      styleId: 'callout',
    });
    expect(section?.childCount).toBe(2); // two paragraphs preserved
    // Serialization is idempotent: a second pass reproduces the first exactly.
    const once = docToMarkdown(doc);
    expect(docToMarkdown(markdownToDoc(once))).toBe(once);
    expect(once).toContain('data-section-style="section-styles-basic/callout"');
  });

  it('handles nested section containers (issue #75)', () => {
    const md = [
      '::: {data-section-style="p/outer"}',
      '::: {data-section-style="p/inner"}',
      'Deep.',
      ':::',
      ':::',
    ].join('\n');
    const outer = markdownToDoc(md).firstChild;
    expect(outer?.attrs.styleId).toBe('outer');
    expect(outer?.firstChild?.type.name).toBe('section');
    expect(outer?.firstChild?.attrs.styleId).toBe('inner');
  });

  it('round-trips a plugin block as a reserved fence (issue #76)', () => {
    const md = ['```dorfteich-plugin mermaid/diagram', '{"source":"graph TD; A-->B"}', '```'].join(
      '\n',
    );
    const doc = markdownToDoc(md);
    const block = doc.firstChild;
    expect(block?.type.name).toBe('plugin_block');
    expect(block?.attrs).toMatchObject({
      pluginId: 'mermaid',
      blockType: 'diagram',
      data: { source: 'graph TD; A-->B' },
    });
    const once = docToMarkdown(doc);
    expect(docToMarkdown(markdownToDoc(once))).toBe(once);
    expect(once).toContain('```dorfteich-plugin mermaid/diagram');
  });

  it('keeps an ordinary fenced code block untouched by the plugin rule', () => {
    const doc = markdownToDoc('```js\nconst x = 1;\n```');
    expect(doc.firstChild?.type.name).toBe('code_block');
  });

  it('degrades an unparsable plugin-block body to empty data (issue #76)', () => {
    const doc = markdownToDoc('```dorfteich-plugin p/t\nnot json at all\n```');
    expect(doc.firstChild?.type.name).toBe('plugin_block');
    expect(doc.firstChild?.attrs.data).toEqual({});
  });

  it('pads a colspan cell so every row keeps the column count (issue #337)', () => {
    // Built directly: markdown cannot express merged cells, so the export
    // is lossy by format — but it must stay a well-formed GFM table.
    const schema = markdownToDoc('x').type.schema;
    const cell = (type: string, text: string, attrs: { colspan?: number } | null = null) =>
      schema.node(type, attrs, [schema.node('paragraph', null, [schema.text(text)])]);
    const doc = schema.node('doc', null, [
      schema.node('table', null, [
        schema.node('table_row', null, [cell('table_header', 'A'), cell('table_header', 'B')]),
        schema.node('table_row', null, [cell('table_cell', 'wide', { colspan: 2 })]),
      ]),
    ]);
    expect(docToMarkdown(doc)).toBe('| A | B |\n| --- | --- |\n| wide |  |');
  });

  it('escalates the fence when the data contains backticks (issue #76)', () => {
    const doc = markdownToDoc('```dorfteich-plugin p/t\n{"code":"x"}\n```');
    const withTicks = doc.type.schema.nodes.plugin_block!.create({
      pluginId: 'p',
      blockType: 't',
      data: { code: 'a ``` fence inside' },
    });
    const md = docToMarkdown(doc.type.schema.nodes.doc!.create(null, [withTicks]));
    const reparsed = markdownToDoc(md);
    expect(reparsed.firstChild?.type.name).toBe('plugin_block');
    expect(reparsed.firstChild?.attrs.data).toEqual({ code: 'a ``` fence inside' });
  });
});