
// DelayedFluidSimulator.h

// Interfaces to the cDelayedFluidSimulator class representing a fluid simulator that has a configurable delay
// before simulating a block. Each tick it takes a consecutive delay "slot" and simulates only blocks in that slot.




#pragma once

#include "FluidSimulator.h"





class cDelayedFluidSimulatorChunkData :
	public cFluidSimulatorData
{
public:
	class cSlot
	{
	public:
		/// Returns true if the specified block is stored
		bool HasBlock(int a_RelX, int a_RelY, int a_RelZ);
		
		/// Adds the specified block unless already present; returns true if added, false if the block was already present
		bool Add(int a_RelX, int a_RelY, int a_RelZ);
		
		/** Array of block containers, each item stores blocks for one Z coord
		Int param is the block index (for faster duplicate comparison in Add())
		*/
		cCoordWithIntVector m_Blocks[16];
	} ;
	
	cDelayedFluidSimulatorChunkData(int a_TickDelay);
	virtual ~cDelayedFluidSimulatorChunkData();
	
	/// Slots, one for each delay tick, each containing the blocks to simulate
	cSlot * m_Slots;
} ;





class cDelayedFluidSimulator :
	public cFluidSimulator
{
	typedef cFluidSimulator super;

public:	
	cDelayedFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid, int a_TickDelay);
	
	// cSimulator overrides:
	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override;
	virtual void Simulate(float a_Dt) override;
	virtual void SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) override;
	virtual cFluidSimulatorData * CreateChunkData(void) override { return new cDelayedFluidSimulatorChunkData(m_TickDelay); }
	
protected:

	int m_TickDelay;   // Count of the m_Slots array in each ChunkData
	int m_AddSlotNum;  // Index into m_Slots[] where to add new blocks in each ChunkData
	int m_SimSlotNum;  // Index into m_Slots[] where to simulate blocks in each ChunkData
	
	int m_TotalBlocks;  // Statistics only: the total number of blocks currently queued

	/*
	Slots:
	| 0 | 1 | ... | m_AddSlotNum | m_SimSlotNum | ... | m_TickDelay - 1 |
	        adding blocks here ^ | ^ simulating here
	*/
	
	/// Called from SimulateChunk() to simulate each block in one slot of blocks. Descendants override this method to provide custom simulation.
	virtual void SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ) = 0;
} ;




