/**
 * documentService Tests (Task A4.11).
 * Prüft Registrierung/Löschung des aktiven Dokuments und die
 * Undo/Redo-Delegation an CADDocument.
 */
import { describe, it, expect, afterEach } from 'vitest';
import { setActiveDocument, getActiveDocument, undoActive, redoActive } from '../src/kernel/document/documentService';
import { CADDocument } from '../src/kernel/document/CADDocument';
import { createInMemoryDoc } from './helpers/inMemoryDoc';
import type { CADElement } from '../src/types/cad.types';

function makeEl(id: string): CADElement {
  return {
    id,
    type: 'rect',
    layerId: 'l',
    x: 0,
    y: 0,
    width: 1,
    height: 1,
    properties: {},
  } as unknown as CADElement;
}

afterEach(() => {
  setActiveDocument(null);
});

describe('documentService', () => {
  it('registriert und entregistriert das aktive Dokument', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    setActiveDocument(doc);
    expect(getActiveDocument()).toBe(doc);
    setActiveDocument(null);
    expect(getActiveDocument()).toBeNull();
  });

  it('undoActive delegiert an das registrierte Dokument', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    doc.addElement(makeEl('x1'));
    setActiveDocument(doc);

    expect(undoActive()).toBe(true);      // Element wird entfernt
    expect(doc.getAllElements().length).toBe(0);
    expect(redoActive()).toBe(true);       // wiederhergestellt
    expect(doc.getAllElements().length).toBe(1);
  });

  it('undoActive liefert false ohne aktives Dokument', () => {
    setActiveDocument(null);
    expect(undoActive()).toBe(false);
    expect(redoActive()).toBe(false);
  });
});