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

import { docToHtml } from './html';
import { docToMarkdown, markdownToDoc } from './markdown';
import { docToPlainText } from './plain-text';

function markers(doc: Node): { kind: string; date: string }[] {
  const found: { kind: string; date: string }[] = [];
  doc.descendants((node) => {
    if (node.type.name === 'date_marker') {
      found.push({ kind: node.attrs.kind as string, date: node.attrs.date as string });
    }
  });
  return found;
}

describe('date markers >>/<< (issue #152)', () => {
  it('parses ISO due and start dates and round-trips canonically', () => {
    const doc = markdownToDoc('Projekt <<2026-07-01 bis >>2026-12-31 fertig.');
    expect(markers(doc)).toEqual([
      { kind: 'start', date: '2026-07-01' },
      { kind: 'due', date: '2026-12-31' },
    ]);
    const markdown = docToMarkdown(doc);
    expect(markdown).toContain('<<2026-07-01');
    expect(markdown).toContain('>>2026-12-31');
  });

  it('accepts dd.mm.yyyy as input lenience but serializes ISO', () => {
    const doc = markdownToDoc('Zieltermin >>31.12.2026 bitte.');
    expect(markers(doc)).toEqual([{ kind: 'due', date: '2026-12-31' }]);
    expect(docToMarkdown(doc)).toContain('>>2026-12-31');
  });

  it('keeps a line-leading >>date out of blockquote parsing', () => {
    const doc = markdownToDoc('>>2026-12-31 ist die Deadline.');
    expect(markers(doc)).toEqual([{ kind: 'due', date: '2026-12-31' }]);
    let quotes = 0;
    doc.descendants((node) => {
      if (node.type.name === 'blockquote') quotes += 1;
    });
    expect(quotes).toBe(0);
    // A real blockquote still works.
    const quote = markdownToDoc('> ein Zitat');
    let realQuotes = 0;
    quote.descendants((node) => {
      if (node.type.name === 'blockquote') realQuotes += 1;
    });
    expect(realQuotes).toBe(1);
  });

  it('leaves invalid calendar dates as plain text', () => {
    const doc = markdownToDoc('Kaputt: >>31.02.2026 bleibt Text.');
    expect(markers(doc)).toEqual([]);
    expect(docToMarkdown(doc)).toContain('31.02.2026');
  });

  it('renders HTML with kind, ISO date, and shows up in plain text', () => {
    const doc = markdownToDoc('Bis >>2026-12-31.');
    const html = docToHtml(doc);
    expect(html).toContain('data-date-marker="due"');
    expect(html).toContain('data-date="2026-12-31"');
    expect(docToPlainText(doc)).toContain('2026-12-31');
  });

  it('works inside task list lines', () => {
    const doc = markdownToDoc('- [ ] Bühne buchen >>2026-08-01 @nadia');
    expect(markers(doc)).toEqual([{ kind: 'due', date: '2026-08-01' }]);
    const markdown = docToMarkdown(doc);
    expect(markdown).toContain('- [ ] Bühne buchen >>2026-08-01 @nadia');
  });
});