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

namespace VoxelEngine.World.WorldGen.Biomes;

public sealed class MountainsBiome : IBiome
{
    private readonly FastNoiseLite _ridged;
    private readonly IBlock _stone;
    private readonly IBlock _snow;
    private readonly Configuration _cfg;

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

    public MountainsBiome(int seed, BlockRegistry blocks, Configuration cfg)
    {
        this._cfg = cfg;
        this._ridged = new FastNoiseLite(seed + 102);
        this._ridged.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
        this._ridged.SetFractalType(FastNoiseLite.FractalType.Ridged);
        this._ridged.SetFractalOctaves(cfg.MountainsRidgedOctaves);
        this._ridged.SetFrequency(cfg.MountainsRidgedFrequency);
        this._stone = blocks.Stone;
        this._snow = blocks.Snow;
        this.Surface = new SurfacePalette(blocks.Stone, blocks.Stone, blocks.Stone);
    }

    public float SampleHeight(NoiseSource noise, float worldX, float worldZ)
        => WorldConstants.SeaLevel + this._cfg.MountainsContinentAmplitude * noise.Continent(worldX, worldZ)
                                   + this._cfg.MountainsRidgedAmplitude * this._ridged.GetNoise(worldX, worldZ);

    public IBlock TopBlock(int worldY) => worldY >= this._cfg.MountainsSnowLine ? this._snow : this._stone;
}