using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Svelto.ECS;

using GamecraftModdingAPI.Utility;

namespace GamecraftModdingAPI.Commands
{
    /// <summary>
    /// A simple implementation of ICustomCommandEngine sufficient for most commands.
    /// This version is for commands which take 1 argument(s)
    /// </summary>
    public class SimpleCustomCommandEngine<A> : ICustomCommandEngine
    {
        public string Name { get; }

        public string Description { get; }

        private Action<A> runCommand;

        public EntitiesDB entitiesDB { set; private get; }

		public bool isRemovable => true;

		public void Dispose()
        {
            GamecraftModdingAPI.Utility.Logging.MetaDebugLog($"Unregistering SimpleCustomCommandEngine {this.Name}");
            CommandRegistrationHelper.Unregister(this.Name);
        }

        public void Ready()
        {
            GamecraftModdingAPI.Utility.Logging.MetaDebugLog($"Registering SimpleCustomCommandEngine {this.Name}");
			CommandRegistrationHelper.Register<A>(this.Name, this.InvokeCatchError, this.Description);
        }

        /// <summary>
        /// Construct the engine
        /// </summary>
        /// <param name="command">The command's operation</param>
        /// <param name="name">The name of the command</param>
        /// <param name="description">The command's description, shown in command help messages</param>
        public SimpleCustomCommandEngine(Action<A> command, string name, string description)
        {
            this.runCommand = command;
            this.Name = name;
            this.Description = description;
        }

		public void Invoke(A a)
        {
            runCommand(a);
        }

		private void InvokeCatchError(A a)
        {
            try
            {
                runCommand(a);
            }
            catch (Exception e)
            {
                CommandRuntimeException wrappedException = new CommandRuntimeException($"Command {Name} threw an exception when executed", e);
				Logging.LogWarning(wrappedException.ToString());
                Logging.CommandLogError(wrappedException.ToString());
            }
        }
    }
}