import { describe, expect, it } from 'vitest';
import { traceToShape, traceToUvBounds } from './trace.js';

describe('traceToShape', () => {
  it('flips y and centers the traced shape', () => {
    const trace = {
      shape: { outline: [[0, 0], [10, 0], [10, 10], [0, 10]] },
      width: 10,
      height: 10,
    };
    const shape = traceToShape(trace, 0.2);
    // Centered at origin, scaled to fit the 2x2 box. The y-flip reverses
    // winding, so the outline is normalized to CCW (order may differ).
    expect(shape.outline).toHaveLength(4);
    expect(shape.outline).toEqual(
      expect.arrayContaining([
        [-1, 1],
        [1, 1],
        [1, -1],
        [-1, -1],
      ]),
    );
  });

  it('maps holes to clockwise winding', () => {
    const trace = {
      shape: {
        outline: [[0, 0], [10, 0], [10, 10], [0, 10]],
        holes: [[[2, 2], [2, 8], [8, 8], [8, 2]]],
      },
      width: 10,
      height: 10,
    };
    const shape = traceToShape(trace, 0.2);
    expect(shape.holes).toHaveLength(1);
    expect(shape.holes![0]).toHaveLength(4);
  });
});

describe('traceToUvBounds', () => {
  it('maps the full image rectangle to the part box', () => {
    const bounds = traceToUvBounds({ width: 10, height: 20 }, 0.2);
    expect(bounds).toEqual({ minX: -1, minY: -2, maxX: 1, maxY: 2 });
  });
});