/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * Licensed under the Oculus SDK License Agreement (the "License");
 * you may not use the Oculus SDK except in compliance with the License,
 * which is provided at the time of installation or download, or which
 * otherwise accompanies this software in either electronic or hard copy form.
 *
 * You may obtain a copy of the License at
 *
 * https://developer.oculus.com/licenses/oculussdk/
 *
 * Unless required by applicable law or agreed to in writing, the Oculus SDK
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using UnityEngine;
using UnityEditor;

namespace Oculus.Interaction.Editor
{
    /// <summary>
    /// Adds an [Optional] label in the inspector over any SerializedField with this attribute.
    /// </summary>
    [CustomPropertyDrawer(typeof(OptionalAttribute))]
    public class OptionalDrawer : DecoratorDrawer
    {
        private static readonly float HEADER_MARGIN = 1f;

        public override void OnGUI(Rect position)
        {
            position.y += HEADER_MARGIN;
            OptionalAttribute optional = attribute as OptionalAttribute;
            string text = "[Optional";
            if ((optional.Flags & OptionalAttribute.Flag.AutoGenerated) != 0)
            {
                text += ", Auto-Generated if missing";
            }
            text += "]";
            EditorGUI.LabelField(position, text);
        }
    }
}