// Copyright 2017 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// 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 System.Collections;
using System;

#if UNITY_EDITOR
using UnityEditor;
#endif  // UNITY_EDITOR

/// Use to display an Info box in the inspector for a Monobehaviour or ScriptableObject.
[AttributeUsage(AttributeTargets.Field, AllowMultiple = true, Inherited = true)]
public class GvrInfo : PropertyAttribute {
  public string text;
  public int numLines;

  public GvrInfo(string text, int numLines) {
    this.text = text;
    this.numLines = numLines;
  }
}

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(GvrInfo))]
public class GvrInfoDrawer : DecoratorDrawer {
  GvrInfo info {
    get { return ((GvrInfo)attribute); }
  }

  public override float GetHeight() {
    return GetHeightForLines(info.numLines);
  }

  public override void OnGUI(Rect position) {
    Draw(position, info.text);
  }

  public static float GetHeightForLines(int numLines) {
    return EditorGUIUtility.singleLineHeight * numLines;
  }

  public static void Draw(Rect position, string text) {
    position.height -= EditorGUIUtility.standardVerticalSpacing;

    int oldFontSize = EditorStyles.helpBox.fontSize;
    EditorStyles.helpBox.fontSize = 11;
    FontStyle oldFontStyle = EditorStyles.helpBox.fontStyle;
    EditorStyles.helpBox.fontStyle = FontStyle.Bold;
    bool oldWordWrap = EditorStyles.helpBox.wordWrap;
    EditorStyles.helpBox.wordWrap = false;

    EditorGUI.HelpBox(position, text, MessageType.Info);

    EditorStyles.helpBox.fontSize = oldFontSize;
    EditorStyles.helpBox.fontStyle = oldFontStyle;
    EditorStyles.helpBox.wordWrap = oldWordWrap;
  }
}
#endif  // UNITY_EDITOR