/**
 * elementToPrimitives Tests (Task C2).
 * Deckt alle unterstützten Typen + Legacy-Konventionen + Grenzfälle ab.
 */
import { describe, it, expect } from 'vitest';
import { elementToPrimitives } from '../src/render/pixi/elementDrawers';
import type { CADElement } from '../src/types/cad.types';

function el(id: string, type: string, props: Record<string, unknown> = {}, geom: Partial<CADElement> = {}): CADElement {
  return {
    id,
    type,
    layerId: 'l',
    x: 0,
    y: 0,
    width: 10,
    height: 10,
    properties: props,
    ...geom,
  } as unknown as CADElement;
}

describe('elementToPrimitives', () => {
  it('line: aus properties.x1..y2 mit stroke/sw', () => {
    const prims = elementToPrimitives(el('l', 'line', {
      x1: 0, y1: 0, x2: 100, y2: 50, stroke: '#f00', strokeWidth: 3,
    }));
    expect(prims.length).toBe(1);
    expect(prims[0]).toEqual({
      kind: 'line', from: { x: 0, y: 0 }, to: { x: 100, y: 50 },
      stroke: '#f00', strokeWidth: 3,
    });
  });

  it('line ohne Koordinaten ergibt leere Liste', () => {
    expect(elementToPrimitives(el('l', 'line', {}))).toEqual([]);
  });

  it('rect: x/y ist Zentrum der BBox (Legacy-Konvention)', () => {
    const prims = elementToPrimitives(el('r', 'rect', { fill: '#123456' }, {
      x: 100, y: 50, width: 80, height: 40,
    }));
    expect(prims.length).toBe(1);
    const p = prims[0];
    if (p.kind !== 'rect') throw new Error('erwartete rect');
    expect(p.x).toBe(60);   // 100 − 40
    expect(p.y).toBe(30);   // 50 − 20
    expect(p.w).toBe(80);
    expect(p.h).toBe(40);
    expect(p.fill).toBe('#123456');
  });

  it('rect fill none wird zu null', () => {
    const prims = elementToPrimitives(el('r', 'rect', { fill: 'none' }));
    const p = prims[0];
    if (p.kind !== 'rect') throw new Error('erwartete rect');
    expect(p.fill).toBeNull();
  });

  it('circle: radius mit Fallback width/2', () => {
    const withExplicit = elementToPrimitives(el('c', 'circle', { radius: 25, fill: '#abcdef' }, { x: 5, y: 5 }));
    const p = withExplicit[0];
    if (p.kind !== 'circle') throw new Error('erwartete circle');
    expect(p.radius).toBe(25);
    expect(p.center).toEqual({ x: 5, y: 5 });
    expect(p.fill).toBe('#abcdef');

    const byWidth = elementToPrimitives(el('c', 'circle', {}, { width: 120 }));
    const pb = byWidth[0];
    if (pb.kind !== 'circle') throw new Error('erwartete circle');
    expect(pb.radius).toBe(60); // fallback
  });

  it('arc: Winkel in Grad wie Legacy', () => {
    const prims = elementToPrimitives(el('a', 'arc', {
      radius: 40, startAngle: 0, endAngle: 90,
    }, { x: 0, y: 0 }));
    const p = prims[0];
    if (p.kind !== 'arc') throw new Error('erwartete arc');
    expect(p.startDeg).toBe(0);
    expect(p.endDeg).toBe(90);
    expect(p.radius).toBe(40);
  });

  it('polyline/polygon: points-Array, close je nach Typ', () => {
    const pts = [{ x: 0, y: 0 }, { x: 10, y: 0 }, { x: 10, y: 10 }];
    const open = elementToPrimitives(el('pl', 'polyline', { points: pts }));
    const closed = elementToPrimitives(el('pg', 'polygon', { points: pts }));
    expect(open.length).toBe(1);
    expect(closed.length).toBe(1);
    if (open[0].kind !== 'polyline' || closed[0].kind !== 'polyline') {
      throw new Error('erwartete polyline');
    }
    expect(open[0].close).toBe(false);
    expect(closed[0].close).toBe(true);
  });

  it('text: leer nicht gerendert; gefuellt mit fontSize/color', () => {
    expect(elementToPrimitives(el('t', 'text', { text: '' }))).toEqual([]);

    const filled = elementToPrimitives(el('t', 'text', {
      text: 'Bühne A', fontSize: 18, color: '#ffffff',
    }, { x: 50, y: 75 }));
    expect(filled.length).toBe(1);
    const p = filled[0];
    if (p.kind !== 'text') throw new Error('erwartete text');
    expect(p.text).toBe('Bühne A');
    expect(p.fontSize).toBe(18);
    expect(p.color).toBe('#ffffff');
  });

  it('unbekannter Typ ergibt leere Liste (renderer-sicher)', () => {
    expect(elementToPrimitives(el('x', 'definitely-unknown'))).toEqual([]);
  });
});