using MessagePack;
using OECS;

namespace Game.Blackjack;

/// <summary>
/// Starts a new round after the previous one ended.
/// </summary>
[MessagePackObject]
public struct NewRoundCommand : ICommand
{
    public void Execute(World world)
    {
        ref var state = ref world.GetSingleton<GameState>();

        if (state.Phase != GamePhase.RoundOver)
            return;

        // Clear hands from previous round.
        var singletonEntity = World.SingletonEntity;
        var handEntities = new List<Entity>();
        using (var iter = world.Select<PlayerHand>())
        {
            while (iter.MoveNext())
            {
                if (iter.CurrentEntity != singletonEntity)
                    handEntities.Add(iter.CurrentEntity);
            }
        }
        using (var iter = world.Select<DealerHand>())
        {
            while (iter.MoveNext())
            {
                if (iter.CurrentEntity != singletonEntity)
                    handEntities.Add(iter.CurrentEntity);
            }
        }
        foreach (var hand in handEntities)
        {
            var cards = world.GetSources<Holds>(hand);
            var deckEntity = HitCommand.FindEntity<Deck>(world, singletonEntity);
            foreach (var card in cards)
            {
                world.RemoveComponent<Holds>(card);
                world.AddComponent(card, new InDeck { Source = card, Target = deckEntity });
            }
        }

        state.Phase = GamePhase.Betting;
        state.Result = RoundResult.None;
        world.MarkModified<GameState>(World.SingletonEntity);
    }
}