public GameState ApplyOn(GameState gameState, Player owner, Minion caster)
{
return(Effects.Aggregate(gameState, (aggregState, eff) =>
TypeSwitchExpr.On <Effect, GameState>(eff)
.Case <CharacterEffect>(effect =>
{
var targets = GetValidTargets(aggregState, owner, caster).ToArray();
var updatedChars = targets.Select(x => effect.ApplyOn((ITarget <Character>)x));
return aggregState.UpdateCharacters(targets, updatedChars);
})
.Case <NonCharacterEffect>(effect =>
{
if (Target.HasFlag(Target.FriendlyPlayer))
{
aggregState = effect.ApplyOn(aggregState, owner, caster);
}
if (Target.HasFlag(Target.EnemyPlayer))
{
aggregState = effect.ApplyOn(aggregState, aggregState.OpponentOf(owner), caster);
}
return aggregState;
})
.ElseThrow()));
}
public WorldState Apply(WorldState initialState)
{
return(Effects.Aggregate(initialState, (soFar, effect) => effect.ApplyTo(soFar)));
}