using UnityEngine;

namespace ZXL.Helper
{
    public static class TextureHelper
    {
        /// <summary>
        /// 精灵图片转纹理
        /// </summary>
        /// <param name="sprite"></param>
        /// <returns></returns>
        public static Texture2D SpriteToTexture2D(Sprite sprite)
        {
            // 获取 Sprite 的纹理
            Texture2D texture = sprite.texture;
            // 创建一个新的 Texture2D 用于存储 Sprite 的图像数据
            Texture2D texture2D = new Texture2D((int)sprite.rect.width, (int)sprite.rect.height);
            // 读取 Sprite 的像素数据到新的 Texture2D
            Color[] pixels = texture.GetPixels(
                (int)sprite.rect.x,
                (int)sprite.rect.y,
                (int)sprite.rect.width,
                (int)sprite.rect.height
            );
            // 将像素数据设置到新的 Texture2D 中
            texture2D.SetPixels(pixels);
            texture2D.Apply(); // 应用更改
            return texture2D;
        }

        /// <summary>
        /// 纹理转精灵图片
        /// </summary>
        /// <param name="texture"></param>
        /// <returns></returns>
        public static Sprite SpriteFromTexture2D(Texture2D texture)
        {
            Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height),
                new Vector2(0.5f, 0.5f));
            return sprite;
        }

        /// <summary>
        /// 截取相机画面并返回纹理图片
        /// </summary>
        /// <param name="camera"></param>
        /// <returns></returns>
        public static Texture2D SaveCameraToTexture(Camera camera)
        {
            Texture2D capturedImage;

            var renderTexture = new RenderTexture(camera.pixelWidth, camera.pixelHeight, 24);
            camera.targetTexture = renderTexture;

            // 创建一个 Texture2D 用来存储相机捕捉的画面
            capturedImage = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.RGB24, false);

            // 从 RenderTexture 中读取像素数据到 Texture2D
            RenderTexture.active = renderTexture;
            capturedImage.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            capturedImage.Apply();

            // 重置 RenderTexture 的激活状态
            RenderTexture.active = null;

            // 此时 capturedImage 就包含了当前帧的画面，你可以进行保存或者其他操作

            return capturedImage;
        }

        /// <summary>
        /// Texture转Texture2D
        /// </summary>
        /// <param name="texture"></param>
        /// <returns></returns>
        public static Texture2D ConvertTextureToTexture2D(Texture texture)
        {
            Texture2D texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);
            RenderTexture currentRT = RenderTexture.active;

            // 创建一个新的 RenderTexture
            RenderTexture renderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 32);
            Graphics.Blit(texture, renderTexture);

            // 将 RenderTexture 内容复制到 Texture2D
            RenderTexture.active = renderTexture;
            texture2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            texture2D.Apply();

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

            return texture2D;
        }

        /// <summary>
        /// 纹理图片转二进制数据
        /// </summary>
        /// <param name="texture"></param>
        /// <returns></returns>
        public static byte[] ConvertTextureToByteArray(Texture2D texture)
        {
            return texture.EncodeToPNG();
        }

        /// <summary>
        /// 二进制数据转纹理图片
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static Texture2D ConvertByteArrayToTexture2D(byte[] bytes)
        {
            Texture2D texture = new Texture2D(2, 2); // 初始化一个临时的 Texture2D
            if (texture.LoadImage(bytes))  // 使用 LoadImage 来加载字节数据
            {
                return texture;
            }
            else
            {
                Debug.LogError("加载图片失败！");
                return null;
            }
        }
    }
}