import { describe, expect, it } from 'vitest';
import { stabilizePageFile, type PageMeta } from '../src/engine/stabilize.js';
// markdownToProseMirror lives in collaboration.ts; importing it mutates the
// global DOM via jsdom at module load time (required for @tiptap/html under Node).
import { markdownToProseMirror } from '../src/lib/markdown-to-prosemirror.js';
import { parseDocmostMarkdown } from '../src/lib/markdown-document.js';

// stabilize.ts (SPEC §11 normalize-on-write) was 0% covered (only the gated e2e
// touched it). stabilizePageFile is import-testable: build a small ProseMirror
// content + meta and assert (1) the normalize-on-write pass reaches a fixpoint
// (a SECOND pass over the written body is byte-identical), and (2) the meta is
// serialized verbatim, including a null parentPageId.

const meta: PageMeta = {
  version: 1,
  pageId: 'pg-1',
  slugId: 'sl-1',
  title: 'My Title',
  spaceId: 'sp-1',
  parentPageId: null,
};

describe('stabilizePageFile — normalize-on-write fixpoint (SPEC §11)', () => {
  it('reaches a byte-identical fixpoint after one extra export/import/export pass', async () => {
    // A diagram is the canonical one-pass asymmetry: drawio's `align` default of
    // "center" materializes on import, so a NAIVE export differs on the second
    // export. stabilizePageFile runs the convergence pass at write time, so the
    // written body must already be at the fixpoint: re-importing its body and
    // re-stabilizing yields the exact same bytes.
    const content = {
      type: 'doc',
      content: [
        { type: 'paragraph', content: [{ type: 'text', text: 'intro' }] },
        { type: 'drawio', attrs: { src: '/d.drawio' } },
        { type: 'paragraph', content: [{ type: 'text', text: 'outro' }] },
      ],
    };

    const file1 = await stabilizePageFile(content, meta);
    // Re-import the written body and stabilize again — the second pass must be
    // byte-identical to the first (the fixpoint property git relies on).
    const body1 = parseDocmostMarkdown(file1).body;
    const doc2 = await markdownToProseMirror(body1);
    const file2 = await stabilizePageFile(doc2, meta);
    expect(file2).toBe(file1);

    // The materialized diagram default is present in the stabilized body (proof
    // that the convergence pass actually ran, not just that two naive exports
    // happened to match).
    expect(body1).toContain('data-align="center"');
  });

  it('already-stable content is unchanged by the pass (idempotent)', async () => {
    // Plain prose is already a fixpoint; stabilizing it once and twice agree.
    const content = {
      type: 'doc',
      content: [{ type: 'paragraph', content: [{ type: 'text', text: 'just plain text' }] }],
    };
    const file1 = await stabilizePageFile(content, meta);
    const body1 = parseDocmostMarkdown(file1).body;
    const doc2 = await markdownToProseMirror(body1);
    const file2 = await stabilizePageFile(doc2, meta);
    expect(file2).toBe(file1);
    expect(body1).toBe('just plain text');
  });
});

describe('stabilizePageFile — meta serialization', () => {
  it('preserves a null parentPageId verbatim in the meta block', async () => {
    const file = await stabilizePageFile(
      { type: 'doc', content: [{ type: 'paragraph', content: [{ type: 'text', text: 'x' }] }] },
      meta,
    );
    const parsed = parseDocmostMarkdown(file);
    // The whole meta round-trips, and parentPageId is exactly null (root page).
    expect(parsed.meta).toEqual(meta);
    expect(parsed.meta!.parentPageId).toBeNull();
    // No trailing docmost:comments block — the sync body serializer omits it.
    expect(file).not.toContain('docmost:comments');
  });

  it('keeps a non-null parentPageId as-is', async () => {
    const childMeta: PageMeta = { ...meta, parentPageId: 'parent-99' };
    const file = await stabilizePageFile(
      { type: 'doc', content: [{ type: 'paragraph', content: [{ type: 'text', text: 'x' }] }] },
      childMeta,
    );
    expect(parseDocmostMarkdown(file).meta).toEqual(childMeta);
  });
});