// tests/helpers/md-section.mjs
// The text of one markdown section, for the prose-pin tests.

import { strict as assert } from 'node:assert';
import { findSection } from '../../lib/parsers/plan-schema.mjs';

/**
 * The text of a heading's section (level from its #-count), up to the next
 * heading of the same or a higher level outside a fence. The heading must exist.
 * @param {string} text
 * @param {string} heading - e.g. `## Phase 8 — Final report`
 * @returns {string}
 */
export function sectionText(text, heading) {
  const level = heading.match(/^#+/)[0].length;
  const s = findSection(text, heading.replace(/^#+ /, ''), level);
  assert.ok(s, `missing ${heading}`);
  const lines = s.text.split('\n');
  let fenced = false;
  for (let i = 1; i < lines.length; i++) {
    if (/^\s{0,3}(`{3,}|~{3,})/.test(lines[i])) fenced = !fenced;
    const m = !fenced && lines[i].match(/^(#+) /);
    if (m && m[1].length < level) return lines.slice(0, i).join('\n');
  }
  return s.text;
}