#pragma once

#include "BlockHandler.h"
#include "../BoundingBox.h"




class cBlockFenceHandler :
	public cBlockHandler
{
public:
	// These are the min and max coordinates (X and Z) for a straight fence.
	// 0.4 and 0.6 are really just guesses, but they seem pretty good.
	// (0.4 to 0.6 is a fence that's 0.2 wide, down the center of the block)
	const double MIN_COORD = 0.4;
	const double MAX_COORD = 0.6;

	cBlockFenceHandler(BLOCKTYPE a_BlockType)
		: cBlockHandler(a_BlockType)
	{
	}

	virtual cBoundingBox GetPlacementCollisionBox(BLOCKTYPE a_XM, BLOCKTYPE a_XP, BLOCKTYPE a_YM, BLOCKTYPE a_YP, BLOCKTYPE a_ZM, BLOCKTYPE a_ZP) override
	{
		bool XMSolid = cBlockInfo::IsSolid(a_XM);
		bool XPSolid = cBlockInfo::IsSolid(a_XP);
		bool ZMSolid = cBlockInfo::IsSolid(a_ZM);
		bool ZPSolid = cBlockInfo::IsSolid(a_ZP);

		double FENCE_HEIGHT = cBlockInfo::GetBlockHeight(m_BlockType);

		// Entities can never be in the center
		cBoundingBox PlacementBox(MIN_COORD, MAX_COORD, 0, FENCE_HEIGHT, MIN_COORD, MAX_COORD);

		// For each solid neighbor, the hitbox extends that way
		if (XMSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(0, 0.5, 0, FENCE_HEIGHT, MIN_COORD, MAX_COORD));
		}
		if (XPSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(0.5, 1.0, 0, FENCE_HEIGHT, MIN_COORD, MAX_COORD));
		}
		if (ZMSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(MIN_COORD, MAX_COORD, 0, FENCE_HEIGHT, 0.0, 0.5));
		}
		if (ZPSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(MIN_COORD, MAX_COORD, 0, FENCE_HEIGHT, 0.5, 1.0));
		}

		// For each corner, fill in the corner
		if (XMSolid && ZMSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(0, 0.5, 0, FENCE_HEIGHT, 0, 0.5));
		}
		if (XPSolid && ZMSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(0.5, 1.0, 0, FENCE_HEIGHT, 0, 0.5));
		}
		if (XPSolid && ZPSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(0.5, 1.0, 0, FENCE_HEIGHT, 0.5, 1.0));
		}
		if (XMSolid && ZPSolid)
		{
			PlacementBox = PlacementBox.Union(cBoundingBox(0, 0.5, 0, FENCE_HEIGHT, 0.5, 1.0));
		}

		return PlacementBox;
	}
};