import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import { parseMarkdown, toMarkdown, mdToHtml, htmlToMd } from '../src/lib/markdown.js';
import { headingOf, linkLabel, normHeading, refPage } from '../src/lib/links.js';
import { headingsOf, sectionOf, staticHtml } from '../src/lib/embed.js';

const require = createRequire(import.meta.url);
const { findLinks, rewriteLinks, backlinks, graph } = require('../electron/links.cjs');

test('heading links: label, parts and round trip', () => {
  assert.equal(refPage('Plans/Road map#Q3'), 'Plans/Road map');
  assert.equal(headingOf('Road map#Q3 goals'), 'Q3 goals');
  assert.equal(headingOf('Page#One#Two'), 'Two');
  assert.equal(headingOf('Page#^abc123'), '');
  assert.equal(headingOf('Page'), '');
  assert.equal(linkLabel('Plans/Road map#Q3'), 'Road map › Q3');
  assert.equal(linkLabel('#Local'), 'Local');
  assert.equal(linkLabel('Page'), 'Page');
  assert.equal(normHeading('  Q3   Goals '), 'q3 goals');
  const md = 'See [[Road map#Q3]], [[#Here]] and [[Page#Part|the part]].';
  const html = mdToHtml(md);
  assert.match(html, /data-ref="Road map#Q3">Road map › Q3</);
  assert.match(html, /data-ref="#Here">Here</);
  assert.match(html, /data-ref="Page#Part">the part</);
  assert.equal(htmlToMd(html), md);
});

test('![[embeds]] are blocks; pictures and other files are not', () => {
  const md = 'Before\n\n![[Roadmap]]\n\n![[Plans/Roadmap#Q3 goals|Goals]]\n\n![[photo.png]]\n\n![[slides.pdf]]\n\nAfter\n';
  const blocks = parseMarkdown(md);
  assert.deepEqual(blocks.map((b) => b.type), ['p', 'embed', 'embed', 'image', 'p', 'p']);
  assert.equal(blocks[1].ref, 'Roadmap');
  assert.equal(blocks[2].ref, 'Plans/Roadmap#Q3 goals');
  assert.equal(blocks[2].alias, 'Goals');
  assert.equal(blocks[4].html, '![[slides.pdf]]'); // unsupported files stay as text
  assert.equal(toMarkdown(blocks), md);
});

const DOC = parseMarkdown('Intro\n\n# Top\n\nunder top\n\n## Alpha\n\n- one\n- [x] two\n\n### Deep\n\nlow\n\n## Beta\n\nbeta text\n');

test('sections: a heading and everything below it, up to the next heading of the same or a higher level', () => {
  assert.deepEqual(headingsOf(DOC).map((h) => `${h.level}:${h.text}`), ['1:Top', '2:Alpha', '3:Deep', '2:Beta']);
  assert.deepEqual(sectionOf(DOC, 'alpha').map((b) => b.type), ['h2', 'bullet', 'todo', 'h3', 'p']);
  assert.equal(sectionOf(DOC, '  ALPHA ').length, 5);
  assert.deepEqual(sectionOf(DOC, 'Beta').map((b) => b.type), ['h2', 'p']);
  assert.equal(sectionOf(DOC, 'Top').length, 9); // everything after the intro line
  assert.equal(sectionOf(DOC, 'Nope'), null);
});

test('embedded content renders read-only, escaped, and with no editor hooks', () => {
  const blocks = parseMarkdown('## Part\n\nSome **bold** & <script>x</script>\n\n- [x] done\n\n```js\nlet a = 1 < 2\n```\n\n| a | b |\n|---|---|\n| 1 | 2 |\n\n![pic](p.png)\n\n![[Other]]\n\n> [!warning]\n> careful\n');
  const html = staticHtml(blocks, { imageUrl: (s) => `media://x/${s}` });
  assert.ok(!html.includes('contenteditable="true"'), 'nothing editable');
  assert.ok(!html.includes('class="block'), 'no editor block wrappers');
  assert.ok(!html.includes('<script>'), 'escaped');
  assert.match(html, /<div class="eb b-h2"><div class="c">Part<\/div><\/div>/);
  assert.match(html, /<b>bold<\/b>/);
  assert.match(html, /b-todo done/);
  assert.match(html, /<div class="ecell">1<\/div>/);
  assert.match(html, /src="media:\/\/x\/p\.png"/);
  assert.match(html, /emb-nested.*data-ref="Other"/);
  assert.match(html, /data-kind="warning"/);
});

test('on disk: embeds count as links, heading parts and aliases survive a rename, files and code are left alone', () => {
  const P = (id, body) => ({ id, title: id.split('/').pop(), parent: null, exists: true, body });
  const notes = P('Notes', 'See [[Plan#Goals|goals]] and [[#Local]].\n\n![[Plan]]\n\n![[Plan#Q3]]\n![[photo.png]] ![[slides.pdf]]\n```\n![[Plan]]\n```\n');
  const before = [P('Plan', '# Goals'), notes];
  assert.deepEqual(findLinks(notes.body).map((l) => (l.embed ? '!' : '') + l.ref), ['Plan#Goals', '#Local', '!Plan', '!Plan#Q3']);
  const out = rewriteLinks(notes.body, before, [P('Roadmap', ''), notes], (id) => (id === 'Plan' ? 'Roadmap' : null));
  assert.equal(out, 'See [[Roadmap#Goals|goals]] and [[#Local]].\n\n![[Roadmap]]\n\n![[Roadmap#Q3]]\n![[photo.png]] ![[slides.pdf]]\n```\n![[Plan]]\n```\n');
  assert.deepEqual(backlinks('Plan', before).map((b) => b.id), ['Notes']);
  assert.deepEqual(graph(before).edges, [['Notes', 'Plan']]);
  assert.deepEqual(graph(before).ghosts, []);
});