#if UNITY_EDITOR
using System;
using UnityEditor;
using UnityEngine;

namespace BITKit.GameEditor
{
    /// <summary>
/// Property drawer for SerializableGuid
///
/// Author: Searous
/// </summary>
[CustomPropertyDrawer(typeof(SerializableGuid))]
public class SerializableGuidPropertyDrawer : PropertyDrawer {
 
    private float ySep = 20;
    private float buttonSize;
 
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
        // Start property draw
        EditorGUI.BeginProperty(position, label, property);
 
        // Get property
        SerializedProperty serializedGuid = property.FindPropertyRelative("serializedGuid");
 
        // Draw label
        position = EditorGUI.PrefixLabel(new Rect(position.x, position.y + ySep / 2, position.width, position.height), GUIUtility.GetControlID(FocusType.Passive), label);
        position.y -= ySep / 2; // Offsets position so we can draw the label for the field centered
 
        buttonSize = position.width / 3; // Update size of buttons to always fit perfeftly above the string representation field
 
        // Buttons
        if(GUI.Button(new Rect(position.xMin, position.yMin, buttonSize, ySep - 2), "New")) {
            serializedGuid.stringValue = Guid.NewGuid().ToString();
        }
        if(GUI.Button(new Rect(position.xMin + buttonSize, position.yMin, buttonSize, ySep - 2), "Copy")) {
            EditorGUIUtility.systemCopyBuffer = serializedGuid.stringValue;
        }
        if(GUI.Button(new Rect(position.xMin + buttonSize * 2, position.yMin, buttonSize, ySep - 2), "Empty"))
        {
            serializedGuid.stringValue = Guid.Empty.ToString();
        }
 
        // Draw fields - passs GUIContent.none to each so they are drawn without labels
        Rect pos = new Rect(position.xMin, position.yMin + ySep, position.width, ySep - 2);
        EditorGUI.PropertyField(pos, serializedGuid, GUIContent.none);
 
        // End property
        EditorGUI.EndProperty();
    }
 
    public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {
        // Field height never changes, so ySep * 2 will always return the proper hight of the field
        return ySep * 2;
    }
}
 
}
#endif