using Godot;

namespace IslaApocalypse.Core
{
	public static class BiomePalette
	{
		/// <summary>
		/// Determines the exact Block ID for a specific voxel in the 3D world based on its depth and biome.
		/// </summary>
		/// <param name="biome">The 2D biome pixel from the MapData.</param>
		/// <param name="surfaceHeight">The maximum height of the terrain at this X/Z coordinate.</param>
		/// <param name="currentY">The Y coordinate of the specific voxel we are painting.</param>
		/// <param name="isRoad">Is this coordinate part of the highway/branch road network?</param>
		public static byte GetVoxelID(Biome biome, int surfaceHeight, int currentY, bool isRoad)
		{
			// 1. Air Check: If we are above the terrain, it's Air.
			if (currentY > surfaceHeight) return BlockRegistry.AIR;

			// 2. Bedrock Check: The very bottom of the world is indestructible.
			if (currentY == 0) return BlockRegistry.BEDROCK;

			// 3. Infrastructure Check: If this is a road, and we are exactly on the surface, paint asphalt.
			if (isRoad && currentY == surfaceHeight) return BlockRegistry.ASPHALT;

			int depthBelowSurface = surfaceHeight - currentY;

			// 4. Subsurface Logic (Dirt layer vs Stone layer)
			// The top 4 blocks are usually dirt/sand, everything below that is solid stone.
			if (depthBelowSurface > 4) return BlockRegistry.STONE;

			// 5. Surface & Shallow Subsurface Logic (Based on Biome)
			switch (biome)
			{
				case Biome.Beach:
				case Biome.Crater:
					return BlockRegistry.SAND; // Craters and Beaches are deep sand

				case Biome.Snow:
				case Biome.Mountain:
					if (depthBelowSurface == 0) return BlockRegistry.SNOW; // Only the top layer is snow
					return BlockRegistry.STONE; // Mountains have shallow topsoil, mostly stone

				case Biome.Wasteland:
					return BlockRegistry.WASTELAND_DIRT;

				case Biome.Jungle:
					if (depthBelowSurface == 0) return BlockRegistry.GRASS_JUNGLE;
					return BlockRegistry.DIRT;

				case Biome.Paradise:
					if (depthBelowSurface == 0) return BlockRegistry.GRASS_PARADISE;
					return BlockRegistry.DIRT;

				case Biome.Tropical:
					if (depthBelowSurface == 0) return BlockRegistry.GRASS_TROPICAL;
					return BlockRegistry.DIRT;

				default:
					return BlockRegistry.DIRT; // Fallback
			}
		}
	}
}