using UnityEngine;
using System;

namespace Rokid.UXR.Interaction {
	
	/// <summary>
	/// When this attribute is attached to a MonoBehaviour field within a
	/// Unity Object, this allows an interface to be specified in to to
	/// entire only a specific type of MonoBehaviour can be attached.
	/// </summary>
	[AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
	public class InterfaceAttribute : PropertyAttribute
	{
	    public Type[] Types = null;
	    public string TypeFromFieldName;
	
	    /// <summary>
	    /// Creates a new Interface attribute.
	    /// </summary>
	    /// <param name="type">The type of interface which is allowed.</param>
	    /// <param name="types">Extra types of interface which is allowed.</param>
	    public InterfaceAttribute(Type type, params Type[] types)
	    {
	        Debug.Log(type.Name + $" {type.Name} needs to be an interface.");
	        Debug.Assert(type.IsInterface, $"{type.Name} needs to be an interface.");
	
	        Types = new Type[types.Length + 1];
	        Types[0] = type;
	        for (int i = 0; i < types.Length; i++)
	        {
	            Debug.Assert(types[i].IsInterface, $"{types[i].Name} needs to be an interface.");
	            Types[i + 1] = types[i];
	        }
	    }
	
	    public InterfaceAttribute(string typeFromFieldName)
	    {
	        this.TypeFromFieldName = typeFromFieldName;
	    }
	}
	
}