using Blue;
using System.IO;
using UnityEngine;
using UnityEngine.UI;

namespace GHZLangChao
{
    /// <summary>
    /// RawImage 转 Sprite
    /// </summary>
    public interface IRawImageForSpriteUtility : IUtility
    {
        Sprite SwitchSprite(RawImage rawImage);
        Sprite PngToSprite(string fullPath, int x, int y);
    }

    public class RawImageForSpriteUtility : IRawImageForSpriteUtility
    {
        public Sprite SwitchSprite(RawImage rawImage)
        {
            SaveLocal(rawImage, "1", "0");

            // 获取RawImage的纹理
            Texture2D rawTexture = TextureToTexture2D(rawImage.texture);
            // 创建一个新的纹理，用于截图
            Texture2D screenshot = new Texture2D(rawTexture.width, rawTexture.height);
            // 截取RawImage的画面，并应用到新的纹理上
            screenshot.SetPixels(rawTexture.GetPixels());
            screenshot.Apply();
            // 将截图应用到Image组件上
            Sprite sprite = Sprite.Create(screenshot, new Rect(0, 0, screenshot.width, screenshot.height), new Vector2(0.5f, 0.5f));
            return sprite;
        }

        /// <summary>
        /// 运行模式下Texture转换成Texture2D
        /// </summary>
        /// <param name="texture"></param>
        /// <returns></returns>
        private Texture2D TextureToTexture2D(Texture texture)
        {
            Texture2D texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);
            RenderTexture currentRT = RenderTexture.active;
            RenderTexture renderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 32);
            Graphics.Blit(texture, renderTexture);

            RenderTexture.active = renderTexture;
            texture2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            texture2D.Apply();

            RenderTexture.active = currentRT;
            RenderTexture.ReleaseTemporary(renderTexture);

            return texture2D;
        }

        /// <summary>
        /// 保存到本地
        /// </summary>
        /// <param name="rawImage"></param>
        /// <param name="Step">某个步骤</param>
        /// <param name="id">某个步骤的第几张图片</param>
        private void SaveLocal(RawImage rawImage, string Step, string id)
        {
            Texture2D texture2D = TextureToTexture2D(rawImage.texture);
            byte[] bytes = texture2D.EncodeToPNG();
            if (!Directory.Exists(Application.persistentDataPath + "/" + Step))
                Directory.CreateDirectory(Application.persistentDataPath + "/" + Step);
            string filename = Application.persistentDataPath + "/" + Step + "/" + id + ".png";
            if (File.Exists(filename))
                File.Delete(filename);
            Debug.LogError(Application.persistentDataPath);
            File.WriteAllBytes(filename, bytes);
        }


        /// <summary>
        /// IO方式 —— 将PNG转为Sprite精灵图片
        /// </summary>
        /// <param name="fullPath">读取的PNG图片全路径：路径+文件名+后缀</param>
        /// <param name="x">图片尺寸：宽</param>
        /// <param name="y">图片尺寸：高</param>
        /// <returns></returns>
        public Sprite PngToSprite(string fullPath, int x, int y)
        {
            using (FileStream fs = new FileStream(fullPath, FileMode.Open, FileAccess.Read)) //自动双清
            {
                fs.Seek(0, SeekOrigin.Begin);  //设定当前流的位置
                byte[] bytes = new byte[fs.Length];      //创建文件长度缓冲区
                fs.Read(bytes, 0, (int)fs.Length);  //读取文件
                Texture2D texture = new Texture2D(x, y); //创建Texture
                texture.LoadImage(bytes);
                return Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), Vector2.one / 2);
            }
        }
    }
}