#include "stdafx.h"
#include "net.minecraft.world.level.newbiome.layer.h"
#include "net.minecraft.world.level.biome.h"

AddIslandLayer::AddIslandLayer(__int64 seedMixup, shared_ptr<Layer>parent) : Layer(seedMixup)
{
	this->parent = parent;
}

intArray AddIslandLayer::getArea(int xo, int yo, int w, int h)
{
	int px = xo - 1;
	int py = yo - 1;
	int pw = w + 2;
	int ph = h + 2;
	intArray p = parent->getArea(px, py, pw, ph);

	intArray result = IntCache::allocate(w * h);
	for (int y = 0; y < h; y++)
	{
		for (int x = 0; x < w; x++)
		{
			int n1 = p[(x + 0) + (y + 0) * pw];
			int n2 = p[(x + 2) + (y + 0) * pw];
			int n3 = p[(x + 0) + (y + 2) * pw];
			int n4 = p[(x + 2) + (y + 2) * pw];
			int c = p[(x + 1) + (y + 1) * pw];
			initRandom(x + xo, y + yo);
			if (c == 0 && (n1 != 0 || n2 != 0 || n3 != 0 || n4 != 0))
			{
				int odds = 1;
				int swap = 1;
				if (n1 != 0 && nextRandom(odds++) == 0) swap = n1;
				if (n2 != 0 && nextRandom(odds++) == 0) swap = n2;
				if (n3 != 0 && nextRandom(odds++) == 0) swap = n3;
				if (n4 != 0 && nextRandom(odds++) == 0) swap = n4;
				if (nextRandom(3) == 0)
				{
					result[x + y * w] = swap;
				}
				else
				{
					if (swap == Biome::iceFlats->id) result[x + y * w] = Biome::frozenOcean->id;
					else result[x + y * w] = 0;
				}
			}
			else if (c > 0 && (n1 == 0 || n2 == 0 || n3 == 0 || n4 == 0))
			{
				if (nextRandom(5) == 0)
				{
					if (c == Biome::iceFlats->id) result[x + y * w] = Biome::frozenOcean->id;
					else result[x + y * w] = 0;
				}
				else result[x + y * w] = c;
			}
			else
			{
				result[x + y * w] = c;
			}
		}
	}

	return result;
}