namespace VoxelEngine.World.WorldGen;

// Seeded wrapper over FastNoiseLite. All Get* methods return roughly [-1, 1].
public sealed class NoiseSource
{
    private readonly FastNoiseLite _continent;
    private readonly FastNoiseLite _temperature;
    private readonly FastNoiseLite _forest;

    public NoiseSource(int seed)
    {
        this._continent = new FastNoiseLite(seed);
        this._continent.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
        this._continent.SetFractalType(FastNoiseLite.FractalType.FBm);
        this._continent.SetFractalOctaves(4);
        this._continent.SetFrequency(0.0035f);

        this._temperature = new FastNoiseLite(seed + 1);
        this._temperature.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
        this._temperature.SetFractalType(FastNoiseLite.FractalType.FBm);
        this._temperature.SetFractalOctaves(3);
        this._temperature.SetFrequency(0.0015f);

        this._forest = new FastNoiseLite(seed + 2);
        this._forest.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
        this._forest.SetFrequency(0.02f);
    }

    public float Continent(float x, float z) => this._continent.GetNoise(x, z);
    public float Temperature(float x, float z) => this._temperature.GetNoise(x, z);
    public float Forest(float x, float z) => this._forest.GetNoise(x, z);
}