using System;
using TechbloxModdingAPI.Events;

namespace TechbloxModdingAPI.Utility
{
    public static class ExceptionUtil
    {
        /// <summary>
        /// Invokes an event with a null-check.
        /// </summary>
        /// <param name="handler">The event to emit, can be null</param>
        /// <param name="sender">Event sender</param>
        /// <param name="args">Event arguments</param>
        /// <typeparam name="T">Type of the event arguments</typeparam>
        public static void InvokeEvent<T>(EventHandler<T> handler, object sender, T args)
        {
            handler?.Invoke(sender, args);
        }

        /// <summary>
        /// Wraps the event handler in a try-catch block to avoid propagating exceptions.
        /// </summary>
        /// <param name="handler">The handler to wrap (not null)</param>
        /// <typeparam name="T">Type of the event arguments</typeparam>
        /// <returns>The wrapped handler</returns>
        public static EventHandler<T> WrapHandler<T>(EventHandler<T> handler)
        {
            return (sender, e) =>
            {
                try
                {
                    handler(sender, e);
                }
                catch (Exception e1)
                {
                    EventRuntimeException wrappedException =
                        new EventRuntimeException($"EventHandler with arg type {typeof(T).Name} threw an exception", e1);
                    Logging.LogWarning(wrappedException.ToString());
                }
            };
        }
    }
}