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using System;
using System.Collections.Generic;
namespace Entelect.BattleCity.Challenge
{
class AiAgent
{
private int? _lastX;
private int? _lastY;
private ChallengeService.action _lastAction;
private bool _hasShotFromLastPosition;
private int _tankId;
private int? _targetX;
private bool _checkForOpenPathToMiddle;
private bool _headingToMiddle;
public AiAgent(int tankId, bool checkForOpenPathToMiddle)
{
_tankId = tankId;
_checkForOpenPathToMiddle = checkForOpenPathToMiddle;
_lastAction = ChallengeService.action.NONE;
_hasShotFromLastPosition = false;
_headingToMiddle = false;
}
public Move GetBestMove(ChallengeService.game game, BoardCell[][] board, ChallengeService.player me, ChallengeService.player enemy)
{
Move move = null;
ChallengeService.unit tank = findTankInPlayer(_tankId, me);
if (tank == null)
{
return null;
}
if (tank.x != _lastX || tank.y != _lastY)
{
_hasShotFromLastPosition = false;
}
var bulletInAir = checkIsBulletInAir(board, me, tank);
var stuckLastTurn = checkStuckLastTurn(tank);
var enemyBase = enemy.@base;
var pastMidpoint = (Math.Abs(enemyBase.y-tank.y) < (board[0].Length / 2));
if (stuckLastTurn && (tank.direction == ChallengeService.direction.UP || tank.direction == ChallengeService.direction.DOWN) && enemyBase.x != tank.x)
{
_targetX = tank.x + (pastMidpoint!=(tank.x > enemyBase.x) ? +1 : -1);
}
if (_checkForOpenPathToMiddle && !_headingToMiddle && tank.x != enemyBase.x)
{
_headingToMiddle = testPathToMiddleIsOpen(board, tank, enemyBase);
}
else if (_checkForOpenPathToMiddle && _headingToMiddle && tank.x == enemyBase.x)
{
_headingToMiddle = false;
}
ChallengeService.direction chosenDirection =
_headingToMiddle ?
(
tank.x > enemyBase.x ?
ChallengeService.direction.LEFT :
ChallengeService.direction.RIGHT
) :
(
tank.y != enemyBase.y ?
(
_targetX.HasValue && _targetX != tank.x ?
(
tank.x > _targetX ?
ChallengeService.direction.LEFT :
ChallengeService.direction.RIGHT
) :
(
tank.y > enemyBase.y ?
ChallengeService.direction.UP :
ChallengeService.direction.DOWN
)
) :
(
tank.x > enemyBase.x ?
ChallengeService.direction.LEFT :
ChallengeService.direction.RIGHT
)
);
if (chosenDirection != tank.direction || bulletInAir || _headingToMiddle)
{
move = MoveInDirection(tank.id, chosenDirection);
}
else
{
move = new Move(tank.id, ChallengeService.action.FIRE);
_hasShotFromLastPosition = true;
}
_lastX = tank.x;
_lastY = tank.y;
_lastAction = move.Action;
return move;
}
private bool testPathToMiddleIsOpen(BoardCell[][] board, ChallengeService.unit tank, ChallengeService.@base enemyBase)
{
var minY = tank.y - 2;
var maxY = tank.y + 2;
var minX = Math.Min(tank.x, enemyBase.x)-2;
var maxX = Math.Max(tank.x, enemyBase.x)+2;
bool insideRange = board.Length > maxX && board[maxX].Length > maxY && 0 <= minX && 0 <= minY;
if (!insideRange)
{
return false;
}
for (int x = minX; x <= maxX; ++x)
{
for (int y = minY; y <= maxY; ++y)
{
if (board[x][y] != BoardCell.EMPTY)
{
return false;
}
}
}
return true;
}
private ChallengeService.unit findTankInPlayer(int tankId, ChallengeService.player me)
{
if (me != null && me.units != null)
{
foreach (var unit in me.units)
{
if (unit.id == _tankId)
{
return unit;
}
}
}
return null;
}
public Move MoveInDirection(int tankId, ChallengeService.direction direction)
{
switch (direction)
{
case ChallengeService.direction.UP:
return new Move(tankId, ChallengeService.action.UP);
case ChallengeService.direction.DOWN:
return new Move(tankId, ChallengeService.action.DOWN);
case ChallengeService.direction.LEFT:
return new Move(tankId, ChallengeService.action.LEFT);
case ChallengeService.direction.RIGHT:
return new Move(tankId, ChallengeService.action.RIGHT);
default:
return new Move(tankId, ChallengeService.action.NONE);
}
}
private bool checkIsBulletInAir(BoardCell[][] board, ChallengeService.player me, ChallengeService.unit tank)
{
var bulletInAir = false;
if (me.bullets != null)
{
foreach (var bullet in me.bullets)
{
if (Math.Abs(bullet.x - tank.x) < board.Length / 6)
{
bulletInAir = true;
}
}
}
return bulletInAir;
}
private bool checkStuckLastTurn(ChallengeService.unit tank)
{
return !(_lastAction == ChallengeService.action.FIRE || _lastAction == ChallengeService.action.NONE)
&& tank.x == _lastX && tank.y == _lastY
&& _hasShotFromLastPosition;
}
}
}
|
