import { describe, expect, it } from 'vitest';
import { IDBFactory } from 'fake-indexeddb';
import { DocumentLibrary, newDocId, type DocMeta } from '../library';

const meta = (id: string, title: string, updatedAt: number): DocMeta => ({
  id,
  title,
  createdAt: 1,
  updatedAt,
});

/** a fresh, empty in-memory IndexedDB per test */
const openLib = () => DocumentLibrary.open(new IDBFactory());

describe('DocumentLibrary', () => {
  it('stores meta and content separately and reads them back', async () => {
    const lib = await openLib();
    await lib.put(meta('a', 'Budget', 10), '{"x":1}');
    expect(await lib.getMeta('a')).toEqual(meta('a', 'Budget', 10));
    expect(await lib.getContent('a')).toBe('{"x":1}');
    expect(await lib.getContent('missing')).toBeUndefined();
  });

  it('lists documents most recently changed first', async () => {
    const lib = await openLib();
    await lib.put(meta('old', 'Alt', 10), '{}');
    await lib.put(meta('new', 'Neu', 30), '{}');
    await lib.put(meta('mid', 'Mitte', 20), '{}');
    expect((await lib.list()).map((d) => d.id)).toEqual(['new', 'mid', 'old']);
  });

  it('patchMeta renames without touching content; unknown ids are ignored', async () => {
    const lib = await openLib();
    await lib.put(meta('a', 'Alt', 10), '{"keep":true}');
    await lib.patchMeta('a', { title: 'Neu' });
    await lib.patchMeta('nope', { title: 'X' });
    expect((await lib.getMeta('a'))?.title).toBe('Neu');
    expect(await lib.getContent('a')).toBe('{"keep":true}');
    expect(await lib.list()).toHaveLength(1);
  });

  it('remove deletes meta and content', async () => {
    const lib = await openLib();
    await lib.put(meta('a', 'A', 10), '{}');
    await lib.remove('a');
    expect(await lib.getMeta('a')).toBeUndefined();
    expect(await lib.getContent('a')).toBeUndefined();
    expect(await lib.list()).toEqual([]);
  });

  it('keeps data across re-opening the same database', async () => {
    const factory = new IDBFactory();
    await (await DocumentLibrary.open(factory)).put(meta('a', 'A', 10), '{"v":2}');
    expect(await (await DocumentLibrary.open(factory)).getContent('a')).toBe('{"v":2}');
  });
});

describe('newDocId', () => {
  it('produces distinct v4 UUIDs', () => {
    const a = newDocId();
    expect(a).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/);
    expect(newDocId()).not.toBe(a);
  });
});