// Copyright (c) 2012-2013 Rotorz Limited. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

using UnityEngine;
using UnityEditor;

using System;

using Rotorz.ReorderableList;

namespace Fungus.Script
{
	
	public class VariableListAdaptor : IReorderableListAdaptor 
	{
		
		private SerializedProperty _arrayProperty;
		
		public float fixedItemHeight;
		
		public SerializedProperty this[int index] 
		{
			get { return _arrayProperty.GetArrayElementAtIndex(index); }
		}
		
		public SerializedProperty arrayProperty 
		{
			get { return _arrayProperty; }
		}
		
		public VariableListAdaptor(SerializedProperty arrayProperty, float fixedItemHeight) 
		{
			if (arrayProperty == null)
				throw new ArgumentNullException("Array property was null.");
			if (!arrayProperty.isArray)
				throw new InvalidOperationException("Specified serialized propery is not an array.");
			
			this._arrayProperty = arrayProperty;
			this.fixedItemHeight = fixedItemHeight;
		}
		
		public VariableListAdaptor(SerializedProperty arrayProperty) : this(arrayProperty, 0f) 
		{
		}

		public int Count 
		{
			get { return _arrayProperty.arraySize; }
		}
		
		public virtual bool CanDrag(int index) 
		{
			return true;
		}

		public virtual bool CanRemove(int index) 
		{
			return true;
		}
		
		public void Add() 
		{
			int newIndex = _arrayProperty.arraySize;
			++_arrayProperty.arraySize;
			ResetValue(_arrayProperty.GetArrayElementAtIndex(newIndex));
		}

		public void Insert(int index) 
		{
			_arrayProperty.InsertArrayElementAtIndex(index);
			ResetValue(_arrayProperty.GetArrayElementAtIndex(index));
		}

		public void Duplicate(int index) 
		{
			_arrayProperty.InsertArrayElementAtIndex(index);
		}

		public void Remove(int index) {
			_arrayProperty.DeleteArrayElementAtIndex(index);
		}


		public void Move(int sourceIndex, int destIndex) 
		{
			if (destIndex > sourceIndex)
				--destIndex;
			_arrayProperty.MoveArrayElement(sourceIndex, destIndex);
		}

		public void Clear() {
			_arrayProperty.ClearArray();
		}
		
		public virtual void DrawItem(Rect position, int index) 
		{
			EditorGUI.PropertyField(position, this[index], GUIContent.none, false);
		}
		
		public virtual float GetItemHeight(int index) 
		{
			return fixedItemHeight != 0f
				? fixedItemHeight
					: EditorGUI.GetPropertyHeight(this[index], GUIContent.none, false)
					;
		}
		
		private void ResetValue(SerializedProperty element) 
		{
			switch (element.type) {
			case "string":
				element.stringValue = "";
				break;
			case "Vector2f":
				element.vector2Value = Vector2.zero;
				break;
			case "Vector3f":
				element.vector3Value = Vector3.zero;
				break;
			case "Rectf":
				element.rectValue = new Rect();
				break;
			case "Quaternionf":
				element.quaternionValue = Quaternion.identity;
				break;
			case "int":
				element.intValue = 0;
				break;
			case "float":
				element.floatValue = 0f;
				break;
			case "UInt8":
				element.boolValue = false;
				break;
			case "ColorRGBA":
				element.colorValue = Color.black;
				break;
				
			default:
				if (element.type.StartsWith("PPtr"))
					element.objectReferenceValue = null;
				break;
			}
		}
	}
	
}