using OpenTK.Mathematics;
using VoxelEngine.Core;
using VoxelEngine.World.Blocks;
using VoxelEngine.World.Chunk;
using VoxelEngine.World.WorldGen;
using Xunit;

namespace VoxelEngine.Tests.WorldGen;

public class CaveCarverTests
{
    private static readonly BlockRegistry Blocks = new();
    private static readonly Configuration Cfg = new();

    private static Chunk MakeStoneChunk()
    {
        Chunk c = new();
        for (int x = 0; x < Chunk.Size; x++)
        for (int y = 0; y < Chunk.Size; y++)
        for (int z = 0; z < Chunk.Size; z++)
            c[x, y, z] = Blocks.Stone.Id;
        return c;
    }

    [Fact]
    public void Carve_IsNoOpOnAirChunk()
    {
        var carver = new CaveCarver(seed: 42, Blocks, Cfg);
        Chunk c = new(); // all-air by default

        carver.Carve(c, new Vector3i(0, 4, 0));

        for (int x = 0; x < Chunk.Size; x++)
        for (int y = 0; y < Chunk.Size; y++)
        for (int z = 0; z < Chunk.Size; z++)
            Assert.Equal(Blocks.Air.Id, c[x, y, z]);
    }
}