import { describe, it, expect } from 'vitest';
import { getHexesInBounds, hexAtPixel } from '@core/hex-grid';

describe('getHexesInBounds', () => {
  const size = 32;

  it('returns hexes covering a small area', () => {
    const hexes = getHexesInBounds(
      { minX: 0, minY: 0, maxX: 100, maxY: 100 },
      size,
    );
    expect(hexes.length).toBeGreaterThan(0);
  });

  it('includes origin hex when bounds contain origin', () => {
    const hexes = getHexesInBounds(
      { minX: -10, minY: -10, maxX: 10, maxY: 10 },
      size,
    );
    const hasOrigin = hexes.some(h => h.q === 0 && h.r === 0);
    expect(hasOrigin).toBe(true);
  });

  it('more hexes for larger area', () => {
    const small = getHexesInBounds(
      { minX: 0, minY: 0, maxX: 100, maxY: 100 },
      size,
    );
    const large = getHexesInBounds(
      { minX: 0, minY: 0, maxX: 500, maxY: 500 },
      size,
    );
    expect(large.length).toBeGreaterThan(small.length);
  });

  it('smaller hex size yields more hexes', () => {
    const bounds = { minX: 0, minY: 0, maxX: 200, maxY: 200 };
    const big = getHexesInBounds(bounds, 64);
    const small = getHexesInBounds(bounds, 16);
    expect(small.length).toBeGreaterThan(big.length);
  });
});

describe('hexAtPixel', () => {
  it('origin pixel maps to origin hex', () => {
    const coord = hexAtPixel({ x: 0, y: 0 }, 32);
    expect(coord.q).toBe(0);
    expect(coord.r).toBe(0);
  });
});