// ***********************************************************************
// Company          : Kunpo
// Author           : KimCh
// Created          : 
//
// Last Modified By : KimCh
// Last Modified On : 
// ***********************************************************************
namespace G
{
    using System.Collections;
    using System.Collections.Generic;
    using System.IO;
    using UnityEditor;
    using UnityEditor.U2D;
    using UnityEngine;
    using UnityEngine.U2D;

    /// <summary>
    /// UI图片导入解析类
    /// 在指定文件下，创建文件夹，会自动生成与新创建文件夹同名图集
    /// 在指定文件夹下导入图片资源时，对其进行解析。符合条件，自动添加进与文件夹同名的图集；不符合条件，不允许导入
    /// </summary>
    public class TexturePostprocessor : AssetPostprocessor
    {
        #region Method

        /// <summary>
        /// 
        /// </summary>
        void OnPreprocessAsset()
        {
            var ext = Path.GetExtension(assetPath);

            if (ext == ".spriteatlas")
            {
                var spriteAtlas = AssetDatabase.LoadAssetAtPath<SpriteAtlas>(assetPath);
                if (!spriteAtlas)
                    return;
                var settings = spriteAtlas.GetPlatformSettings("DefaultTexturePlatform");
                if (settings == null)
                    return;
                settings.name = "iPhone";
                SetOverriddenFormat(settings, settings.textureCompression, true);
                spriteAtlas.SetPlatformSettings(settings);
            }
        }

        /// <summary>
        /// 图片导入
        /// </summary>
        void OnPreprocessTexture()
        {
            var ti = assetImporter as TextureImporter;

            var dir = Path.GetDirectoryName(assetPath);
            if (dir.StartsWith(@"Assets\Arts\Textures\Weapon"))
            {
                SetSpriteFormat(ti, 1024);
            }
            else if (dir.StartsWith(@"Assets\Arts\Models\Weapon"))
            {
                SetTextureFormat(ti, 512);
            }
            else if (dir.StartsWith(@"Assets\Arts\Spines"))
            {
                SetTextureFormat2(ti, 1024);
            }
            else if (dir.StartsWith(@"Assets\Arts\Textures\Chapter"))
            {
                SetAtlasSpriteFormat(ti, 0);
            }
            else if (dir.Contains("UI"))
            {
                SetAtlasSpriteFormat(ti, 0);
            }
            else if (dir.Contains("VFX"))
            {
                var folder = Path.GetFileName(dir);
                var xIndex = folder.LastIndexOf('x');
                if (xIndex != -1 && int.TryParse(folder.Substring(xIndex + 1), out int size))
                {
                    ti.maxTextureSize = Mathf.Min(size, ti.maxTextureSize);
                }
                else
                {
                    ti.maxTextureSize = 256;
                }
                //ti.npotScale = TextureImporterNPOTScale.None;
                ti.mipmapEnabled = false;
                ti.isReadable = false;
                ti.textureCompression = TextureImporterCompression.Compressed;
            }

            SetCompression(ti);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="ti"></param>
        /// <param name="maxSize"></param>
        static void SetSpriteFormat(TextureImporter ti, int maxSize, bool fullRect = false)
        {
            if (maxSize > 0 && ti.maxTextureSize > maxSize)
                ti.maxTextureSize = maxSize;
            ti.mipmapEnabled = false;
            //ti.isReadable = false;
            ti.npotScale = TextureImporterNPOTScale.None;

            if (ti.textureType != TextureImporterType.Sprite)
            {
                ti.textureType = TextureImporterType.Sprite;
                ti.textureCompression = TextureImporterCompression.Compressed;
            }
            else
            {
                //设置sprite 九宫格图片的MashType
                if (fullRect)
                {
                    var textureSettings = new TextureImporterSettings();
                    ti.ReadTextureSettings(textureSettings);
                    if (textureSettings.spriteMeshType != SpriteMeshType.FullRect)
                    {
                        textureSettings.spriteMeshType = SpriteMeshType.FullRect;
                        ti.SetTextureSettings(textureSettings);
                        ti.SaveAndReimport();
                    }
                }
            }
        }

        static void SetAtlasSpriteFormat(TextureImporter ti, int maxSize, bool fullRect = false)
        {
            if (maxSize > 0 && ti.maxTextureSize > maxSize)
                ti.maxTextureSize = maxSize;
            ti.mipmapEnabled = false;
            //ti.isReadable = false;
            ti.npotScale = TextureImporterNPOTScale.None;

            if (ti.textureType != TextureImporterType.Sprite)
            {
                ti.textureType = TextureImporterType.Sprite;
                ti.textureCompression = TextureImporterCompression.Uncompressed;
            }
            else
            {
                ti.textureCompression = TextureImporterCompression.Uncompressed;
                //设置sprite 九宫格图片的MashType
                if (fullRect)
                {
                    var textureSettings = new TextureImporterSettings();
                    ti.ReadTextureSettings(textureSettings);
                    if (textureSettings.spriteMeshType != SpriteMeshType.FullRect)
                    {
                        textureSettings.spriteMeshType = SpriteMeshType.FullRect;
                        ti.SetTextureSettings(textureSettings);
                        ti.SaveAndReimport();
                    }
                }
            }
        }


        static void SetTextureFormat(TextureImporter ti, int maxSize)
        {
            ti.maxTextureSize = maxSize;
            ti.mipmapEnabled = false;
            ti.isReadable = false;
            //ti.npotScale = TextureImporterNPOTScale.ToNearest;

            ti.textureType = TextureImporterType.Default;
            ti.textureCompression = TextureImporterCompression.Compressed;
        }

        static void SetTextureFormat2(TextureImporter ti, int maxSize)
        {
            ti.maxTextureSize = maxSize;
            ti.mipmapEnabled = false;
            ti.isReadable = false;
            ti.npotScale = TextureImporterNPOTScale.ToNearest;

            ti.textureType = TextureImporterType.Default;
            ti.textureCompression = TextureImporterCompression.CompressedHQ;
        }

        static void SetCompression(TextureImporter importer)
        {
            var defaultTS = importer.GetDefaultPlatformTextureSettings();
            defaultTS.name = "iPhone";
            //var iOSTS = importer.GetPlatformTextureSettings("iOS");
            //defaultTS.CopyTo(iOSTS);

            SetOverriddenFormat(defaultTS, defaultTS.textureCompression, importer.alphaSource != TextureImporterAlphaSource.None);

            importer.SetPlatformTextureSettings(defaultTS);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="settings"></param>
        /// <param name="alpha"></param>
        static void SetOverriddenFormat(TextureImporterPlatformSettings settings, TextureImporterCompression compression, bool alpha)
        {
            switch (settings.textureCompression)
            {
                case TextureImporterCompression.Compressed:
                    settings.overridden = true;
                    settings.format = alpha ? TextureImporterFormat.ASTC_6x6 : TextureImporterFormat.ASTC_6x6;
                    settings.compressionQuality = (int)UnityEditor.TextureCompressionQuality.Normal;
                    break;
                case TextureImporterCompression.CompressedHQ:
                    settings.overridden = true;
                    settings.format = alpha ? TextureImporterFormat.ASTC_4x4 : TextureImporterFormat.ASTC_4x4;
                    settings.compressionQuality = (int)UnityEditor.TextureCompressionQuality.Best;
                    break;
                case TextureImporterCompression.CompressedLQ:
                    settings.overridden = true;
                    settings.format = alpha ? TextureImporterFormat.ASTC_8x8 : TextureImporterFormat.ASTC_8x8;
                    settings.compressionQuality = (int)UnityEditor.TextureCompressionQuality.Fast;
                    break;
                case TextureImporterCompression.Uncompressed:
                    settings.overridden = false;
                    break;
            }
        }

        #endregion
    }
}