/**
 * MockAdapter – Headless-Doppel der RenderEngine für Workflow-Tests.
 * Zeichnet nichts; protokolliert alle Aufrufe in `calls` (Reihenfolge getreu).
 *
 * Methodenumfang = genau das, was InteractionEngine derzeit an RenderEngine
 * ruft (verifiziert in Task A0): hitTest, render, setActiveSnapPoint,
 * setOptions, setPreviewElement, setSnapPoints.
 * Wird in C1 (RenderAdapter-Interface) um die vollen Adapter-Methoden erweitert.
 */
import type { CADElement } from '../../src/types/cad.types';

export interface RecordedCall {
  method: string;
  args: unknown[];
}

export class MockRenderEngine {
  /** Alle Aufrufe in Reihenfolge. */
  readonly calls: RecordedCall[] = [];

  /** Von Tests konfigurierbare hitTest-Rückgabe. */
  nextHitTestResult: CADElement | null = null;

  // ── Von InteractionEngine genutzte Fläche ────────────────

  hitTest(x: number, y: number, tolerance?: number): CADElement | null {
    this.calls.push({ method: 'hitTest', args: [x, y, tolerance] });
    return this.nextHitTestResult;
  }

  render(): void {
    this.calls.push({ method: 'render', args: [] });
  }

  setActiveSnapPoint(pt: unknown): void {
    this.calls.push({ method: 'setActiveSnapPoint', args: [pt] });
  }

  setOptions(opts: Record<string, unknown>): void {
    this.calls.push({ method: 'setOptions', args: [opts] });
  }

  setPreviewElement(el: CADElement | null): void {
    this.calls.push({ method: 'setPreviewElement', args: [el] });
  }

  setSnapPoints(pts: unknown[]): void {
    this.calls.push({ method: 'setSnapPoints', args: [pts] });
  }

  // ── Test-Helfer ──────────────────────────────────────────

  /** Anzahl Aufrufe einer Methode. */
  countCalls(method: string): number {
    return this.calls.filter((c) => c.method === method).length;
  }

  /** Letzte aufgezeichnete Argumentliste einer Methode (oder undefined). */
  lastArgsOf(method: string): unknown[] | undefined {
    const found = this.calls.filter((c) => c.method === method);
    return found.length ? found[found.length - 1].args : undefined;
  }

  /** Protokoll leeren. */
  reset(): void {
    this.calls.length = 0;
    this.nextHitTestResult = null;
  }
}