using System.IO;
using UnityEngine;

/// <summary>
/// 将图片保存在本地
/// </summary>
public class SaveImageLocalComputer:SingletonManager<SaveImageLocalComputer>
{
    /// <summary>
    /// 保存图片
    /// </summary>
    /// <param name="sprite">图片</param>
    public void SaveImages(Sprite sprite)
    {
        Texture2D tex = sprite.texture;
        string path = Application.streamingAssetsPath;
#if UNITY_ANDROID && !UNITY_EDITOR
            path = "/sdcard/DCIM/Camera"; //设置图片保存到设备的目录.
#endif
        if (!Directory.Exists(path))
            Directory.CreateDirectory(path);
        string savePath = path + "/" + tex.name + ".png";
        try
        {
            Application.HasUserAuthorization(UserAuthorization.Microphone);
            byte[] data = DeCompress(tex).EncodeToPNG();
            File.WriteAllBytes(savePath, data);
            OnSaveImagesPlartform(savePath);
        }
        catch
        {
        }
    }

    /// <summary>
    /// 刷新相册（不需要单独创建原生aar或jar）
    /// </summary>
    /// <param name="path"></param>
    private void OnSaveImagesPlartform(string filePath)
    {
#if UNITY_ANDROID && !UNITY_EDITOR
            string[] paths = new string[1];
            paths[0] = filePath; 
            using (AndroidJavaClass PlayerActivity = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
            {
                AndroidJavaObject playerActivity = PlayerActivity.GetStatic<AndroidJavaObject>("currentActivity");
                using (AndroidJavaObject Conn = new AndroidJavaObject("android.media.MediaScannerConnection", playerActivity, null))
                {
                    Conn.CallStatic("scanFile", playerActivity, paths, null, null);
                }
            }
#endif
    }
    /// <summary>
    /// 压缩图片
    /// </summary>
    /// <param name="source"></param>
    /// <returns></returns>
    private Texture2D DeCompress(Texture2D source)
    {
        RenderTexture renderTex = RenderTexture.GetTemporary(
                    source.width,
                    source.height,
                    0,
                    RenderTextureFormat.Default,
                    RenderTextureReadWrite.sRGB);

        Graphics.Blit(source, renderTex);
        RenderTexture previous = RenderTexture.active;
        RenderTexture.active = renderTex;
        Texture2D readableText = new Texture2D(source.width, source.height);
        readableText.ReadPixels(new Rect(0, 0, renderTex.width, renderTex.height), 0, 0);
        readableText.Apply();
        RenderTexture.active = previous;
        RenderTexture.ReleaseTemporary(renderTex);
        return readableText;
    }
}