/****************************************************************************
 * Copyright (c) 2017 ~ 2020.1 liangxie
 * 
 * http://qframework.io
 * https://github.com/liangxiegame/QFramework
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ****************************************************************************/

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Object = UnityEngine.Object;

namespace QFramework
{
    public class UIKitConfig
    {
        public virtual UIRoot Root
        {
            get { return UIRoot.Instance; }
        }
        
        public virtual IPanel LoadPanel(PanelSearchKeys panelSearchKeys)
        {
            var panelLoader = PanelLoaderPool.AllocateLoader();
            
            // panelLoader.LoadPanelPrefab 感谢 NormalKatt、高跟鞋提供为反馈
            var panelPrefab = panelLoader.LoadPanelPrefab(panelSearchKeys);

            var obj = Object.Instantiate(panelPrefab);

            var retScript = obj.GetComponent<UIPanel>();

            var panelInterface = retScript as IPanel;
            panelInterface.Loader = panelLoader;

            return retScript;
        }


        public virtual void LoadPanelAsync(PanelSearchKeys panelSearchKeys, Action<IPanel> onPanelLoad)
        {
            var panelLoader = PanelLoaderPool.AllocateLoader();

            panelLoader.LoadPanelPrefabAsync(panelSearchKeys, (panelPrefab) =>
            {
                var obj = Object.Instantiate(panelPrefab);

                var retScript = obj.GetComponent<UIPanel>();

                var panelInterface = retScript as IPanel;
                panelInterface.Loader = panelLoader;

                onPanelLoad?.Invoke(retScript);
            });
        }


        public IPanelLoaderPool PanelLoaderPool = new DefaultPanelLoaderPool();

        public virtual void SetDefaultSizeOfPanel(IPanel panel)
        {
            var panelRectTrans = panel.Transform as RectTransform;

            panelRectTrans.offsetMin = Vector2.zero;
            panelRectTrans.offsetMax = Vector2.zero;
            panelRectTrans.anchoredPosition3D = Vector3.zero;
            panelRectTrans.anchorMin = Vector2.zero;
            panelRectTrans.anchorMax = Vector2.one;

            panelRectTrans.localScale = Vector3.one;
        }
    }

    /// <summary>
    /// 如果想要定制自己的加载器，自定义 IPanelLoader 以及
    /// </summary>
    public interface IPanelLoader
    {
        GameObject LoadPanelPrefab(PanelSearchKeys panelSearchKeys);

        void LoadPanelPrefabAsync(PanelSearchKeys panelSearchKeys, Action<GameObject> onPanelPrefabLoad);

        void Unload();
    }


    public interface IPanelLoaderPool
    {
        IPanelLoader AllocateLoader();
        void RecycleLoader(IPanelLoader panelLoader);
    }

    public abstract class AbstractPanelLoaderPool : IPanelLoaderPool
    {
        private Stack<IPanelLoader> mPool = new Stack<IPanelLoader>(16);

        public IPanelLoader AllocateLoader()
        {
            return mPool.Count > 0 ? mPool.Pop() : CreatePanelLoader();
        }

        protected abstract IPanelLoader CreatePanelLoader();

        public void RecycleLoader(IPanelLoader panelLoader)
        {
            mPool.Push(panelLoader);
        }
    }

    public class DefaultPanelLoaderPool : AbstractPanelLoaderPool
    {
        /// <summary>
        /// Default
        /// </summary>
        public class DefaultPanelLoader : IPanelLoader
        {
            private GameObject mPanelPrefab;

            public GameObject LoadPanelPrefab(PanelSearchKeys panelSearchKeys)
            {
                mPanelPrefab = Resources.Load<GameObject>(panelSearchKeys.GameObjName);
                return mPanelPrefab;
            }

            public void LoadPanelPrefabAsync(PanelSearchKeys panelSearchKeys, Action<GameObject> onPanelLoad)
            {
                var request = Resources.LoadAsync<GameObject>(panelSearchKeys.GameObjName);

                request.completed += operation => { onPanelLoad(request.asset as GameObject); };
            }

            public void Unload()
            {
                mPanelPrefab = null;
            }
        }

        protected override IPanelLoader CreatePanelLoader()
        {
            return new DefaultPanelLoader();
        }
    }
}