/**
 * Regenerates `content-page.yjs` from `content-page.md` (issue #32).
 *
 * `content-page.md` is the source of truth — a Markdown document
 * deliberately covering every node type and mark in the editor schema
 * (packages/shared/src/editor-schema/schema.ts, issue #24) and already a
 * fixed point of the Markdown round-trip (`docToMarkdown(markdownToDoc(x))
 * === x`); the seed script (`../seed.ts`) loads the checked-in `.yjs`
 * binary directly rather than re-parsing Markdown on every run.
 *
 * Deterministic: `Y.Doc`'s `clientID` is normally randomized per instance,
 * which would make the encoded update differ on every regeneration even
 * for identical content. Pinning it to a fixed value makes the output a
 * pure function of `content-page.md`, so re-running this without editing
 * the Markdown produces a byte-identical `.yjs` (verified — re-run and
 * `git diff` should show no changes).
 *
 * Run after editing `content-page.md`:
 *   pnpm --filter @dorfteich/api fixtures:regenerate
 */
import { readFileSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';

import { docToMarkdown, editorSchema, markdownToDoc } from '@dorfteich/shared';
import { prosemirrorJSONToYXmlFragment } from 'y-prosemirror';
import * as Y from 'yjs';

const FIXTURE_DIR = join(__dirname);
const FIXED_CLIENT_ID = 1;

function main(): void {
  const markdown = readFileSync(join(FIXTURE_DIR, 'content-page.md'), 'utf8');
  const doc = markdownToDoc(markdown);

  // Round-trip sanity check: if this ever fails, the schema or serializer
  // changed in a way that makes content-page.md no longer a fixed point —
  // fix the schema/serializer or update content-page.md, don't silently
  // check in a snapshot that doesn't match its own source.
  const roundTripped = docToMarkdown(doc);
  if (roundTripped !== markdown) {
    console.error('content-page.md is not a fixed point of the Markdown round-trip.');
    console.error('--- expected (content-page.md) ---');
    console.error(markdown);
    console.error('--- got (docToMarkdown(markdownToDoc(content-page.md))) ---');
    console.error(roundTripped);
    process.exit(1);
  }

  const ydoc = new Y.Doc();
  ydoc.clientID = FIXED_CLIENT_ID;
  const fragment = ydoc.getXmlFragment('default');
  prosemirrorJSONToYXmlFragment(editorSchema, doc.toJSON(), fragment);
  const state = Y.encodeStateAsUpdate(ydoc);
  ydoc.destroy();

  writeFileSync(join(FIXTURE_DIR, 'content-page.yjs'), state);
  console.log(`fixtures: wrote content-page.yjs (${state.length} bytes)`);
}

main();