public InningState Transition(PlateAppearanceOutcome outcome)
{
var(rbis, newBaseState, outs) = GetNewValues(outcome, BaseState, Outs);
this.Score += rbis;
this.BaseState = newBaseState;
this.Outs = outs;
return(this);
}
private (int rbis, BaseState newBaseState, int outs) GetNewValues(PlateAppearanceOutcome outcome, BaseState baseState, int outs)
{
var rbis = 0;
var newBaseState = baseState;
switch (outcome)
{
case PlateAppearanceOutcome.Strikeout:
outs++;
break;
case PlateAppearanceOutcome.Walk:
if (baseState == BaseState.Full)
{
rbis++;
}
newBaseState = HandleWalk(baseState);
break;
case PlateAppearanceOutcome.Single:
if (baseState.RunnerOnSecond())
{
rbis++;
}
if (baseState.RunnerOnThird())
{
rbis++;
}
newBaseState = HandleSingle(baseState);
break;
case PlateAppearanceOutcome.Double:
rbis = baseState.RunnersOnBase();
newBaseState = BaseState.Second;
break;
case PlateAppearanceOutcome.Triple:
rbis = baseState.RunnersOnBase();
newBaseState = BaseState.Third;
break;
case PlateAppearanceOutcome.HomeRun:
rbis = baseState.RunnersOnBase() + 1;
newBaseState = BaseState.Empty;
break;
case PlateAppearanceOutcome.FlyOut:
var sf = baseState.RunnerOnThird() && outs < 2;
if (sf)
{
rbis++;
}
newBaseState = HandleFlyOut(baseState);
outs++;
break;
case PlateAppearanceOutcome.GroundOut:
var first = baseState.RunnerOnFirst();
var second = baseState.RunnerOnSecond();
var third = baseState.RunnerOnThird();
var dp = (first || second) && !third;
if (dp)
{
outs += 2;
}
else
{
outs++;
}
newBaseState = HandleGroundOut(baseState);
break;
}
return(rbis, newBaseState, outs);
}
