using System;
using AlicizaX.Runtime;
using Cysharp.Threading.Tasks;

namespace AlicizaX.EventKit.Runtime
{
    public class EventProcessorAttribute : Attribute
    {
        public EventProcessorAttribute()
        {
        }
    }

    public interface IEventProcessor
    {
        /// <summary>
        /// <see cref="IEvent.EventType"/>
        /// </summary>
        /// <returns></returns>
        Type EventType();

        /// <summary>
        /// <see cref="IEvent.Invoke"/>
        /// </summary>
        /// <returns></returns>
        UniTask Invoke(object self);
    }

    public abstract class EventProcessorHandler<T> : IEventProcessor where T : unmanaged, IEvent
    {
        private readonly Type _selfType = typeof(T);

        /// <summary>
        /// <see cref="IEvent.EventType"/>
        /// </summary>
        /// <returns></returns>
        public Type EventType()
        {
            return _selfType;
        }


        /// <summary>
        /// 事件调用的方法，要在这个方法里编写事件发生的逻辑
        /// </summary>
        /// <param name="self"></param>
        protected abstract UniTask Handler(T self);

        /// <summary>
        /// <see cref="IEvent.Invoke"/>
        /// </summary>
        /// <returns></returns>
        public async UniTask Invoke(object self)
        {
            try
            {
                await Handler((T)self);
            }
            catch (Exception e)
            {
                Log.Error($"{_selfType.Name} Error {e}");
            }
        }
    }
}