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using UnityEngine;
using UnityEditor;


public class MoveComponentContext
{
	enum Destination
	{
		Top,
		Bottom
	};


	const string kComponentArrayName = "m_Component";
	const int kFirstComponentIndex = 1;


	[MenuItem ("CONTEXT/Component/Move to Top")]
	static void Top (MenuCommand command)
	{
		Move ((Component)command.context, Destination.Top);
	}


	[MenuItem ("CONTEXT/Component/Move to Bottom")]
	static void Bottom (MenuCommand command)
	{
		Move ((Component)command.context, Destination.Bottom);
	}


	static void Move (Component target, Destination destination)
	{
		SerializedObject gameObject = new SerializedObject (target.gameObject);
		SerializedProperty componentArray = gameObject.FindProperty (kComponentArrayName);

		int lastComponentIndex = componentArray.arraySize - 1;
		int targetIndex = destination == Destination.Top ? kFirstComponentIndex : lastComponentIndex;

		for (int index = kFirstComponentIndex; index <= lastComponentIndex; ++index)
		{
			SerializedProperty iterator = componentArray.GetArrayElementAtIndex (index);
			iterator.Next (true);
			iterator.Next (true);

			if (iterator.objectReferenceValue == target)
			{
				componentArray.MoveArrayElement (index, targetIndex);
				gameObject.ApplyModifiedProperties ();

				break;
			}
		}
	}
}