import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import { parseMarkdown } from '../src/lib/markdown.js';
import { linkHeading, matchesHeading } from '../src/lib/links.js';
import { sectionOf } from '../src/lib/embed.js';

const require = createRequire(import.meta.url);
const { renameHeadingRefs, matchesHeading: matchesOnDisk, linkHeading: linkHeadingOnDisk } = require('../electron/links.cjs');

test('heading text inside a link: unsafe characters become spaces, matching ignores case and spacing', () => {
  assert.equal(linkHeading('C# [tips] | ^x'), 'C tips x');
  assert.equal(linkHeading('  Plain   heading '), 'Plain heading');
  assert.equal(linkHeading('# | ^'), '');
  assert.ok(matchesHeading('goals', 'Goals'));
  assert.ok(matchesHeading('Q3  GOALS', ' q3 goals '));
  assert.ok(matchesHeading('C tips', 'C# [tips]'), 'the link-safe spelling of a heading finds it');
  assert.ok(matchesHeading('C# [tips]', 'C# [tips]'));
  assert.ok(!matchesHeading('', 'Goals') && !matchesHeading('Goal', 'Goals'));
  // the disk side follows the same rules
  for (const [a, b] of [['goals', 'Goals'], ['C tips', 'C# [tips]'], ['Goal', 'Goals']]) assert.equal(matchesOnDisk(a, b), matchesHeading(a, b));
  assert.equal(linkHeadingOnDisk('C# [tips] | ^x'), linkHeading('C# [tips] | ^x'));
  // a section can be found by either spelling
  const blocks = parseMarkdown('## C# [tips]\n\ntext\n\n## Next\n');
  assert.equal(sectionOf(blocks, 'C tips').length, 2);
});

test('renaming a heading re-points [[Page#Heading]] links and embeds, and nothing else', () => {
  const P = (id, body) => ({ id, title: id.split('/').pop(), parent: null, exists: true, body });
  const pages = [P('Plan', '# Goals'), P('Archive/Plan', '# Goals'), P('Notes', '')];
  const body = 'See [[Plan#Goals]], [[plan#GOALS|the goals]], ![[Plan#goals]], [[Plan#Goals#Sub]], [[Plan#Other]], [[Archive/Plan#Goals]], [[#Goals]], [[Plan]], `[[Plan#Goals]]`.';
  const r = renameHeadingRefs(body, pages, 'Plan', 'Goals', 'Q3 [goals] | new #1');
  assert.equal(r.count, 3);
  assert.equal(r.body, 'See [[Plan#Q3 goals new 1]], [[plan#Q3 goals new 1|the goals]], ![[Plan#Q3 goals new 1]], [[Plan#Goals#Sub]], [[Plan#Other]], [[Archive/Plan#Goals]], [[#Goals]], [[Plan]], `[[Plan#Goals]]`.');
  assert.equal(renameHeadingRefs('nothing [[Plan#X]]', pages, 'Plan', 'Goals', 'New'), null);
  assert.equal(renameHeadingRefs(body, pages, 'Plan', 'Goals', '# | ^'), null, 'a name with nothing usable is not written');
  // a link written with the link-safe spelling of the old heading follows too
  const unsafe = renameHeadingRefs('[[Plan#C tips]]', [P('Plan', '')], 'Plan', 'C# [tips]', 'New');
  assert.equal(unsafe.body, '[[Plan#New]]');
});