// MoveGenerator.cpp: implementation of the CMoveGenerator class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "EightNum.h"
#include "MoveGenerator.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CMoveGenerator::CMoveGenerator()
{
	m_nMoveCount=0;
	m_iCurPly=0;
}

CMoveGenerator::~CMoveGenerator()
{

}

int CMoveGenerator::CreatePossibleMove(BYTE byBoard[][3],int iPly,BYTE byDirect)
{
	CHESSMOVE cm;
	int i,j;
	int iCount=0;
	int iSmallest=10;
	int iTemp;

	//清空隊(duì)列
	while(!m_queueMove.empty())
		m_queueMove.pop();

	if(m_iCurPly!=iPly)
		m_nMoveCount=0;
	m_iCurPly=iPly;

	//找到空格所在位置
	cm.iPly=iPly;
	for(i=0;i<3;i++)
		for(j=0;j<3;j++)
			if(byBoard[i][j]==0)
			{
				cm.cpFrom.x=i;
				cm.cpFrom.y=j;
				goto Move;
			}

Move:
	//空格向上移
	if(byDirect!=TODOWN)
	{
		if(i-1>=0)
		{
			cm.cpTo.x=i-1;
			cm.cpTo.y=j;
			
			MakeMove(byBoard,cm);
			iTemp=m_pEval->Eveluate(byBoard);
			UnMakeMove(byBoard,cm);
			
			if(iTemp<=iSmallest)
			{
				m_queueMove.push(cm);
				iSmallest=iTemp;
				
				//已達(dá)到目標(biāo)狀態(tài)
				if(!iSmallest)
				{
					AddMove(cm,iPly);
					return 0;
				}
			}
		}
	}

	//空格向右移
	if(byDirect!=TOLEFT)
	{
		if(j+1<3)
		{
			cm.cpTo.x=i;
			cm.cpTo.y=j+1;
			
			MakeMove(byBoard,cm);
			iTemp=m_pEval->Eveluate(byBoard);
			UnMakeMove(byBoard,cm);
			
			if(iTemp<=iSmallest)
			{
				m_queueMove.push(cm);
				iSmallest=iTemp;
				
				//已達(dá)到目標(biāo)狀態(tài)
				if(!iSmallest)
				{
					AddMove(cm,iPly);
					return 0;
				}
			}
		}
	}

	//空格向下移
	if(byDirect!=TOUP)
	{
		if(i+1<3)
		{
			cm.cpTo.x=i+1;
			cm.cpTo.y=j;
			
			MakeMove(byBoard,cm);
			iTemp=m_pEval->Eveluate(byBoard);
			UnMakeMove(byBoard,cm);
			
			if(iTemp<=iSmallest)
			{
				m_queueMove.push(cm);
				iSmallest=iTemp;
				
				//已達(dá)到目標(biāo)狀態(tài)
				if(!iSmallest)
				{
					AddMove(cm,iPly);
					return 0;
				}
			}
		}
	}

	//空格向左移
	if(byDirect!=TORIGHT)
	{
		if(j-1>=0)
		{
			cm.cpTo.x=i;
			cm.cpTo.y=j-1;
			
			MakeMove(byBoard,cm);
			iTemp=m_pEval->Eveluate(byBoard);
			UnMakeMove(byBoard,cm);
			
			if(iTemp<=iSmallest)
			{
				m_queueMove.push(cm);
				iSmallest=iTemp;
				
				//已達(dá)到目標(biāo)狀態(tài)
				if(!iSmallest)
				{
					AddMove(cm,iPly);
					return 0;
				}
			}
		}
	}

	while(!m_queueMove.empty())
	{
		MakeMove(byBoard,m_queueMove.front());
		if(m_pEval->Eveluate(byBoard)==iSmallest)
		{
			iCount++;
			AddMove(m_queueMove.front(),iPly);
		}
		UnMakeMove(byBoard,m_queueMove.front());
		m_queueMove.pop();
	}

	return iCount;
}