#if UNITY_2019_3_OR_NEWER

#pragma warning disable CA1034 // Nested types should not be visible
#pragma warning disable CA2235 // Mark all non-serializable fields

using System;
using UnityEngine;

namespace MackySoft.SerializeReferenceExtensions.Example {

    public class Example : MonoBehaviour {

        // The type that implements ICommand will be displayed in the popup.
        [SerializeReference, SubclassSelector]
        ICommand m_Command;

        // Collection support
        [SerializeReference, SubclassSelector]
        ICommand[] m_Commands = Array.Empty<ICommand>();

		void Start () {
            m_Command?.Execute();

            foreach (ICommand command in m_Commands) {
                command?.Execute();
			}
		}

        // Nested type support
		[Serializable]
        public class NestedCommand : ICommand {
            public void Execute () {
                Debug.Log("Execute NestedCommand");
			}
		}

    }

    public interface ICommand {
        void Execute ();
	}

    [Serializable]
    public class DebugCommand : ICommand {
        [SerializeField]
        string m_Message;
        public void Execute () {
            Debug.Log(m_Message);
		}
	}

    [Serializable]
    public class InstantiateCommand : ICommand {

        [SerializeField]
		GameObject m_Prefab;

		public void Execute () {
            UnityEngine.Object.Instantiate(m_Prefab,Vector3.zero,Quaternion.identity);
		}
	}

    // Menu override support
    [AddTypeMenu("Example/Add Type Menu Command")]
    [Serializable]
    public class AddTypeMenuCommand : ICommand {
        public void Execute () {
            Debug.Log("Execute AddTypeMenuCommand");
		}
	}

}
#endif