using VoxelEngine.Core;
using VoxelEngine.World.Blocks;

namespace VoxelEngine.World.WorldGen.Biomes;

public sealed class ForestBiome : IBiome
{
    private readonly FastNoiseLite _detail;
    private readonly Configuration _cfg;

    public string Name => "Forest";
    public SurfacePalette Surface { get; }

    public ForestBiome(int seed, BlockRegistry blocks, Configuration cfg)
    {
        this._cfg = cfg;
        this._detail = new FastNoiseLite(seed + 103);
        this._detail.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
        this._detail.SetFrequency(cfg.ForestDetailFrequency);
        this.Surface = new SurfacePalette(blocks.Grass, blocks.Dirt, blocks.Stone);
    }

    public float SampleHeight(NoiseSource noise, float worldX, float worldZ)
        => WorldConstants.SeaLevel + this._cfg.ForestContinentAmplitude * noise.Continent(worldX, worldZ)
                                   + this._cfg.ForestDetailAmplitude * this._detail.GetNoise(worldX, worldZ);

    public IBlock TopBlock(int worldY) => this.Surface.Top;
}