/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2012-2017 DragonBones team and other contributors
 *
 * 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.Collections.Generic;
using UnityEngine;

namespace DragonBones
{
    /**
     * @language zh_CN
     * Unity 贴图集数据。
     * @version DragonBones 3.0
     */
    public class UnityTextureAtlasData : TextureAtlasData
    {
        /**
         * @private
         */
        internal bool _disposeEnabled;
        /**
         * @language zh_CN
         * Unity 贴图。
         * @version DragonBones 3.0
         */
        public Material texture;
        public Material uiTexture;
        /**
         * @private
         */
        public UnityTextureAtlasData()
        {
        }
        /**
         * @private
         */
        protected override void _OnClear()
        {
            base._OnClear();

            if (_disposeEnabled && texture != null)
            {
                UnityFactoryHelper.DestroyUnityObject(texture);
            }

            if (_disposeEnabled && uiTexture != null)
            {
                UnityFactoryHelper.DestroyUnityObject(uiTexture);
            }

            _disposeEnabled = false;
            texture = null;
            uiTexture = null;
        }
        /**
         * @private
         */
        public override TextureData CreateTexture()
        {
            return BaseObject.BorrowObject<UnityTextureData>();
        }
    }

    /// <private/>
    internal class UnityTextureData : TextureData
    {
        public const string SHADER_PATH = "Shaders/";
        public const string SHADER_GRAP = "DB_BlendMode_Grab";
        public const string SHADER_FRAME_BUFFER = "DB_BlendMode_Framebuffer";
        public const string UI_SHADER_GRAP = "DB_BlendMode_UIGrab";
        public const string UI_SHADER_FRAME_BUFFER = "DB_BlendMode_UIFramebuffer";

        /// <summary>
        /// 叠加模式材质球的缓存池
        /// </summary>
        internal Dictionary<string, Material> _cacheBlendModeMats = new Dictionary<string, Material>();

        public UnityTextureData()
        {
        }

        protected override void _OnClear()
        {
            base._OnClear();

            foreach (var key in this._cacheBlendModeMats.Keys)
            {
                var mat = this._cacheBlendModeMats[key];
                if (mat != null)
                {
                    UnityFactoryHelper.DestroyUnityObject(mat);
                }

                //this._cacheBlendModeMats[key] = null;
            }

            //
            this._cacheBlendModeMats.Clear();
        }

        private Material _GetMaterial(BlendMode blendMode)
        {
            //normal model, return the parent shareMaterial
            if (blendMode == BlendMode.Normal)
            {
                return (this.parent as UnityTextureAtlasData).texture;
            }

            var blendModeStr = blendMode.ToString();

            if (this._cacheBlendModeMats.ContainsKey(blendModeStr))
            {
                return this._cacheBlendModeMats[blendModeStr];
            }

            //framebuffer won't work in the editor mode
#if UNITY_EDITOR
            var newMaterial = new Material(Resources.Load<Shader>(SHADER_PATH + SHADER_GRAP));
#else
            var newMaterial = new Material(Resources.Load<Shader>(SHADER_PATH + SHADER_GRAP));
#endif
            var texture = (this.parent as UnityTextureAtlasData).texture.mainTexture;
            newMaterial.name = texture.name + "_" + SHADER_GRAP + "_Mat";
            newMaterial.hideFlags = HideFlags.HideAndDontSave;
            newMaterial.mainTexture = texture;

            this._cacheBlendModeMats.Add(blendModeStr, newMaterial);

            return newMaterial;
        }

        private Material _GetUIMaterial(BlendMode blendMode)
        {
            //normal model, return the parent shareMaterial
            if (blendMode == BlendMode.Normal)
            {
                return (this.parent as UnityTextureAtlasData).uiTexture;
            }

            var blendModeStr = "UI_" + blendMode.ToString();

            if (this._cacheBlendModeMats.ContainsKey(blendModeStr))
            {
                return this._cacheBlendModeMats[blendModeStr];
            }

            //framebuffer won't work in the editor mode
#if UNITY_EDITOR
            var newMaterial = new Material(Resources.Load<Shader>(SHADER_PATH + UI_SHADER_GRAP));
#else
            var newMaterial = new Material(Resources.Load<Shader>(SHADER_PATH + UI_SHADER_GRAP));
#endif
            var texture = (this.parent as UnityTextureAtlasData).uiTexture.mainTexture;
            newMaterial.name = texture.name + "_" + SHADER_GRAP + "_Mat";
            newMaterial.hideFlags = HideFlags.HideAndDontSave;
            newMaterial.mainTexture = texture;

            this._cacheBlendModeMats.Add(blendModeStr, newMaterial);

            return newMaterial;
        }

        internal Material GetMaterial(BlendMode blendMode, bool isUGUI = false)
        {
            if (isUGUI)
            {
                return _GetUIMaterial(blendMode);
            }
            else
            {
                return _GetMaterial(blendMode);
            }
        }

        public override void CopyFrom(TextureData value)
        {
            base.CopyFrom(value);

            //
            (value as UnityTextureData)._cacheBlendModeMats = this._cacheBlendModeMats;
        }
    }
}