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AdvancedGamePlayer.cs
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/*
* AdvancedGamePlayer.cs --
*
* Copyright (c) 2007-2024 by Joe Mistachkin. All rights reserved.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: $
*/
namespace TicTacToe
{
internal sealed class AdvancedGamePlayer : SimpleGamePlayer
{
#region IGamePlayer Members
public override bool GetRowAndColumn(
IGameBoard gameBoard, /* in */
MarkType turn, /* in */
ref int row, /* out */
ref int column /* out */
)
{
if (base.GetSimpleRowAndColumn(
gameBoard, turn, ref row, ref column))
{
return true;
}
if (GetBestRowAndColumn(
gameBoard, turn, ref row, ref column))
{
return true;
}
return base.GetRowAndColumn(
gameBoard, turn, ref row, ref column);
}
#endregion
///////////////////////////////////////////////////////////////////////
#region Private Methods
private void UpdateStatistics(
IGameBoard gameBoard, /* in */
int[] winningBoard, /* in */
int[] noneCounts, /* in */
int[] turnCounts, /* in */
bool hasNone, /* in */
bool hasTurn, /* in */
ref int? maximumIndex /* in, out */
)
{
if (gameBoard == null)
return;
if (winningBoard == null)
return;
int length = winningBoard.Length;
if (noneCounts == null)
return;
if (turnCounts == null)
return;
int size = noneCounts.Length;
if (turnCounts.Length != size)
return;
for (int index = 0; index < length; index++)
{
int winningIndex = winningBoard[index];
if ((winningIndex >= 0) &&
(winningIndex < size))
{
if (hasNone)
noneCounts[winningIndex]++;
if (hasTurn)
turnCounts[winningIndex]++;
}
}
for (int index = 0; index < size; index++)
{
int maximumCount = 0;
if (maximumIndex != null)
{
maximumCount += noneCounts[(int)maximumIndex];
maximumCount += turnCounts[(int)maximumIndex];
}
int count = noneCounts[index];
count += turnCounts[index];
if (count > maximumCount)
{
int row = 0;
int column = 0;
if (gameBoard.IndexToRowAndColumn(
index, ref row, ref column) &&
(gameBoard.GetMark(
row, column) == MarkType.None))
{
maximumIndex = index;
}
}
}
}
///////////////////////////////////////////////////////////////////////
private bool GetBestRowAndColumn(
IGameBoard gameBoard, /* in */
MarkType turn, /* in */
ref int row, /* out */
ref int column /* out */
)
{
if (gameBoard == null)
return false;
int size = gameBoard.Size;
if (size == 0)
return false;
int[][] winningBoards = BigData.GetWinningBoards();
if (winningBoards == null)
return false;
int? maximumIndex = null;
int[] noneCounts = new int[size];
int[] turnCounts = new int[size];
foreach (int[] winningBoard in winningBoards)
{
if (winningBoard == null)
continue;
bool hasTurn = false;
bool hasNone = false;
int length = winningBoard.Length;
for (int index = 0; index < length; index++)
{
if (!gameBoard.IndexToRowAndColumn(
winningBoard[index],
ref row, ref column))
{
break;
}
MarkType markType = gameBoard.GetMark(
row, column);
if (markType == MarkType.None)
{
hasNone = true;
continue;
}
if (markType == turn)
{
hasTurn = true;
continue;
}
hasNone = false;
hasTurn = false;
break;
}
if (hasNone || hasTurn)
{
UpdateStatistics(gameBoard,
winningBoard, noneCounts, turnCounts,
hasNone, hasTurn, ref maximumIndex);
}
}
if (maximumIndex == null)
return false;
if (!gameBoard.IndexToRowAndColumn(
(int)maximumIndex, ref row, ref column))
{
return false;
}
return true;
}
#endregion
}
}