#pragma once

#include "RedstoneHandler.h"





class cRedstoneTorchHandler final : public cRedstoneHandler
{
public:

	inline static bool IsOn(BLOCKTYPE a_Block)
	{
		return (a_Block == E_BLOCK_REDSTONE_TORCH_ON);
	}

	inline static Vector3i GetOffsetAttachedTo(Vector3i a_Position, NIBBLETYPE a_Meta)
	{
		switch (a_Meta)
		{
			case E_META_TORCH_FLOOR: return { 0, -1, 0 };
			case E_META_TORCH_EAST: return { -1, 0, 0 };
			case E_META_TORCH_WEST: return { 1, 0, 0 };
			case E_META_TORCH_NORTH: return { 0, 0, 1 };
			case E_META_TORCH_SOUTH: return { 0, 0, -1 };
			default:
			{
				ASSERT(!"Unhandled torch metadata");
				return { 0, 0, 0 };
			}
		}
	}

	virtual unsigned char GetPowerDeliveredToPosition(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, Vector3i a_QueryPosition, BLOCKTYPE a_QueryBlockType) const override
	{
		if (
			IsOn(a_BlockType) &&
			(a_QueryPosition != (a_Position + GetOffsetAttachedTo(a_Position, a_Meta))) &&
			(cIncrementalRedstoneSimulator::IsMechanism(a_QueryBlockType) || (cBlockInfo::FullyOccupiesVoxel(a_QueryBlockType) && (a_QueryPosition == (a_Position + OffsetYP))))
		)
		{
			return 15;
		}
		return 0;
	}

	virtual void Update(cChunk & a_Chunk, cChunk & CurrentlyTicking, Vector3i a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, PoweringData a_PoweringData) const override
	{
		// LOGD("Evaluating torchy the redstone torch (%i %i %i)", a_Position.x, a_Position.y, a_Position.z);

		auto & Data = DataForChunk(a_Chunk);
		auto DelayInfo = Data.GetMechanismDelayInfo(a_Position);

		if (DelayInfo == nullptr)
		{
			bool ShouldBeOn = (a_PoweringData.PowerLevel == 0);
			if (ShouldBeOn != IsOn(a_BlockType))
			{
				Data.m_MechanismDelays[a_Position] = std::make_pair(1, ShouldBeOn);
			}
		}
		else
		{
			int DelayTicks;
			bool ShouldPowerOn;
			std::tie(DelayTicks, ShouldPowerOn) = *DelayInfo;

			if (DelayTicks != 0)
			{
				return;
			}

			a_Chunk.SetBlock(a_Position, ShouldPowerOn ? E_BLOCK_REDSTONE_TORCH_ON : E_BLOCK_REDSTONE_TORCH_OFF, a_Meta);
			Data.m_MechanismDelays.erase(a_Position);

			for (const auto Adjacent : RelativeAdjacents)
			{
				if (Adjacent != GetOffsetAttachedTo(a_Position, a_Meta))
				{
					UpdateAdjustedRelative(a_Chunk, CurrentlyTicking, a_Position + Adjacent);
				}
			}
		}
	}

	virtual void ForValidSourcePositions(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, SourceCallback Callback) const override
	{
		UNUSED(a_Chunk);
		UNUSED(a_BlockType);
		Callback(a_Position + GetOffsetAttachedTo(a_Position, a_Meta));
	}
};