using Syntriax.Engine.Core;

namespace Syntriax.Engine.Systems.StateMachine;

public interface IState : IEntity, INameable
{
    Event<IState> OnStateUpdate { get; }
    Event<IState, StateTransitionedFromArguments> OnStateTransitionedFrom { get; }
    Event<IState, StateTransitionedToArguments> OnStateTransitionedTo { get; }
    Event<IState, StateTransitionReadyArguments> OnStateTransitionReady { get; }

    IState? GetNextState();

    void Update();
    void TransitionTo(IState from);
    void TransitionFrom(IState to);

    readonly record struct StateTransitionedFromArguments(IState ToState);
    readonly record struct StateTransitionedToArguments(IState FromState);
    readonly record struct StateTransitionReadyArguments(IState ToState);
}