cuberite-2a/src/Blocks/BlockLever.h

#pragma once

#include "BlockHandler.h"
#include "../Chunk.h"
#include "MetaRotator.h"
#include "BlockSlab.h"


class cBlockLeverHandler :
	public cMetaRotator<cBlockHandler, 0x07, 0x04, 0x01, 0x03, 0x02, false>
{
	typedef cMetaRotator<cBlockHandler, 0x07, 0x04, 0x01, 0x03, 0x02, false> super;

public:
	cBlockLeverHandler(BLOCKTYPE a_BlockType) :
		super(a_BlockType)
	{
	}

	virtual bool OnUse(cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface, cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override
	{
		Vector3i Coords(a_BlockX, a_BlockY, a_BlockZ);
		// Flip the ON bit on / off using the XOR bitwise operation
		NIBBLETYPE Meta = (a_ChunkInterface.GetBlockMeta(Coords) ^ 0x08);

		a_ChunkInterface.SetBlockMeta(Coords.x, Coords.y, Coords.z, Meta);
		a_WorldInterface.WakeUpSimulators(Coords);
		a_WorldInterface.GetBroadcastManager().BroadcastSoundEffect("block.lever.click", Vector3d(Coords), 0.5f, (Meta & 0x08) ? 0.6f : 0.5f);
		return true;
	}

	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
	{
		// Reset meta to 0
		a_Pickups.push_back(cItem(E_BLOCK_LEVER, 1, 0));
	}

	virtual bool IsUseable(void) override
	{
		return true;
	}

	virtual bool GetPlacementBlockTypeMeta(
		cChunkInterface & a_ChunkInterface, cPlayer & a_Player,
		int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace,
		int a_CursorX, int a_CursorY, int a_CursorZ,
		BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
	) override
	{
		a_BlockType = m_BlockType;
		a_BlockMeta = LeverDirectionToMetaData(a_BlockFace);
		return true;
	}

	inline static NIBBLETYPE LeverDirectionToMetaData(eBlockFace a_Dir)
	{
		// Determine lever direction:
		switch (a_Dir)
		{
			case BLOCK_FACE_YP:   return 0x6;
			case BLOCK_FACE_XP:   return 0x1;
			case BLOCK_FACE_XM:   return 0x2;
			case BLOCK_FACE_ZP:   return 0x3;
			case BLOCK_FACE_ZM:   return 0x4;
			case BLOCK_FACE_YM:   return 0x0;
			case BLOCK_FACE_NONE: return 0x6;
		}
		UNREACHABLE("Unsupported block face");
	}

	inline static eBlockFace BlockMetaDataToBlockFace(NIBBLETYPE a_Meta)
	{
		switch (a_Meta & 0x7)
		{
			case 0x1: return BLOCK_FACE_XP;
			case 0x2: return BLOCK_FACE_XM;
			case 0x3: return BLOCK_FACE_ZP;
			case 0x4: return BLOCK_FACE_ZM;
			case 0x5:
			case 0x6: return BLOCK_FACE_YP;
			case 0x7:
			case 0x0: return BLOCK_FACE_YM;
			default:
			{
				ASSERT(!"Unhandled block meta!");
				return BLOCK_FACE_NONE;
			}
		}
	}

	virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
	{
		NIBBLETYPE Meta = a_Chunk.GetMeta(a_RelX, a_RelY, a_RelZ);

		eBlockFace Face = BlockMetaDataToBlockFace(Meta);

		AddFaceDirection(a_RelX, a_RelY, a_RelZ, Face, true);

		if ((a_RelY < 0) || (a_RelY >= cChunkDef::Height -1))
		{
			return false;
		}

		BLOCKTYPE BlockIsOn;
		a_Chunk.UnboundedRelGetBlock(a_RelX, a_RelY, a_RelZ, BlockIsOn, Meta);


		if (cBlockInfo::FullyOccupiesVoxel(BlockIsOn))
		{
			return true;
		}
		else if (cBlockSlabHandler::IsAnySlabType(BlockIsOn))
		{
			// Check if the slab is turned up side down
			if (((Meta & 0x08) == 0x08) && (Face == BLOCK_FACE_TOP))
			{
				return true;
			}
		}

		return false;
	}

	virtual NIBBLETYPE MetaRotateCCW(NIBBLETYPE a_Meta) override
	{
		switch (a_Meta)
		{
			case 0x00: return 0x07;  // Ceiling rotation
			case 0x07: return 0x00;

			case 0x05: return 0x06;  // Ground rotation
			case 0x06: return 0x05;

			default:  return super::MetaRotateCCW(a_Meta);  // Wall Rotation
		}
	}

	virtual NIBBLETYPE MetaRotateCW(NIBBLETYPE a_Meta) override
	{
		switch (a_Meta)
		{
			case 0x00: return 0x07;  // Ceiling rotation
			case 0x07: return 0x00;

			case 0x05: return 0x06;  // Ground rotation
			case 0x06: return 0x05;

			default:  return super::MetaRotateCW(a_Meta);  // Wall Rotation
		}
	}

	virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) override
	{
		UNUSED(a_Meta);
		return 0;
	}

	/** Extracts the ON bit from metadata and returns if true if it is set */
	static bool IsLeverOn(NIBBLETYPE a_BlockMeta)
	{
		return ((a_BlockMeta & 0x8) == 0x8);
	}
} ;