
// BlockFarmland.h

// Declares the cBlcokFarmlandHandler representing the block handler for farmland





#pragma once

#include "BlockHandler.h"
#include "../BlockArea.h"





class cBlockFarmlandHandler :
	public cBlockHandler
{
	
public:
	cBlockFarmlandHandler(BLOCKTYPE a_BlockType) :
		cBlockHandler(a_BlockType)
	{
	}

	virtual void OnUpdate(cChunkInterface & cChunkInterface, cWorldInterface & a_WorldInterface, cBlockPluginInterface & a_PluginInterface, cChunk & a_Chunk, int a_RelX, int a_RelY, int a_RelZ) override
	{
		NIBBLETYPE BlockMeta = a_Chunk.GetMeta(a_RelX, a_RelY, a_RelZ);

		if (IsWaterInNear(a_Chunk, a_RelX, a_RelY, a_RelZ))
		{
			// Water was found, set block meta to 7
			a_Chunk.FastSetBlock(a_RelX, a_RelY, a_RelZ, m_BlockType, 7);
			return;
		}

		// Water wasn't found, de-hydrate block:
		if (BlockMeta > 0)
		{
			a_Chunk.FastSetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_FARMLAND, --BlockMeta);
			return;
		}

		// Farmland too dry. If nothing is growing on top, turn back to dirt:
		BLOCKTYPE UpperBlock = (a_RelY >= cChunkDef::Height) ? E_BLOCK_AIR : a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ);
		switch (UpperBlock)
		{
			case E_BLOCK_CROPS:
			case E_BLOCK_POTATOES:
			case E_BLOCK_CARROTS:
			case E_BLOCK_MELON_STEM:
			case E_BLOCK_PUMPKIN_STEM:
			{
				// Produce on top, don't revert
				break;
			}
			default:
			{
				a_Chunk.SetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_DIRT, 0);
				break;
			}
		}
	}

	virtual void OnNeighborChanged(cChunkInterface & a_ChunkInterface, int a_BlockX, int a_BlockY, int a_BlockZ) override
	{
		if (a_BlockY >= cChunkDef::Height)
		{
			return;
		}

		BLOCKTYPE UpperBlock = a_ChunkInterface.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ);
		if (cBlockInfo::FullyOccupiesVoxel(UpperBlock))
		{
			a_ChunkInterface.SetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_DIRT, 0);
		}
	}

	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
	{
		a_Pickups.Add(E_BLOCK_DIRT, 1, 0);  // Reset meta
	}

	bool IsWaterInNear(cChunk & a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
	{
		if (a_Chunk.GetWorld()->IsWeatherWetAt(a_RelX, a_RelZ))
		{
			// Rain hydrates farmland, too, except in Desert biomes.
			return true;
		}

		// Search for water in a close proximity:
		// Ref.: http://www.minecraftwiki.net/wiki/Farmland#Hydrated_Farmland_Tiles
		// TODO: Rewrite this to use the chunk and its neighbors directly
		cBlockArea Area;
		int BlockX = a_RelX + a_Chunk.GetPosX() * cChunkDef::Width;
		int BlockZ = a_RelZ + a_Chunk.GetPosZ() * cChunkDef::Width;
		if (!Area.Read(a_Chunk.GetWorld(), BlockX - 4, BlockX + 4, a_RelY, a_RelY + 1, BlockZ - 4, BlockZ + 4))
		{
			// Too close to the world edge, cannot check surroundings
			return false;
		}

		size_t NumBlocks = Area.GetBlockCount();
		BLOCKTYPE * BlockTypes = Area.GetBlockTypes();
		for (size_t i = 0; i < NumBlocks; i++)
		{
			if (IsBlockWater(BlockTypes[i]))
			{
				return true;
			}
		}  // for i - BlockTypes[]

		return false;
	}
} ;




