class TestChunkGenerator : ChunkGenerator() {
    val chunkSize = 16
    val sectorSize = 3

    private fun skyCast(chunkData: ChunkData, x: Int, z: Int): Int {
        var max = 128
        while (chunkData.getType(x, max, z) == Material.AIR) {
            max--
            if (max < 0) return 0
        }
        return max + 1
    }

    override fun generateChunkData(world: World, random: Random, x: Int, z: Int, biome: BiomeGrid) = createChunkData(world).apply {
        val noiseGen = SimplexOctaveGenerator(random, 5)

        for (practicalX in x..x + 15) {
            for (practicalZ in z..z + 15) {
                val noise = ((noiseGen.noise(practicalX.toDouble(), practicalZ.toDouble(), 0.5, 0.5, true) + 1) * 5.0 + 50.0)
                    .toInt()
                setBlock(practicalX, 0, practicalZ, Material.BEDROCK)
                for (practicalY in 1 until noise) {
                    setBlock(practicalX, practicalY, practicalZ, Material.DIRT)
                }
                setBlock(practicalX, noise, practicalZ, Material.GRASS_BLOCK)
            }
        }

        if (x % sectorSize == 0) {
            // why does the x need to be a multiple of 5?
            for (practicalX in 0 until chunkSize) {
                setRegion(0, 0, practicalX, 1, skyCast(this, practicalX, 0), x + 1, Material.WHITE_CONCRETE)
            }
        }

        if (z % sectorSize == 0) {
            for (practicalZ in 0 until chunkSize) {
                setRegion(z, 0, 0, z + 1, skyCast(this, 0, z), 1, Material.WHITE_CONCRETE)
            }
        }
    }
}