using System;
using System.Collections;
using System.IO;
using UnityEngine;
using UnityEngine.Android;
using UnityEngine.UI;

public class ShareScreenshotButton : MonoBehaviour
{
    public Button screenshotButton;
    private string fileName;

    // Start is called before the first frame update
    void Start()
    {
        if (!AndroidVersionIs11OrAbove() && !Permission.HasUserAuthorizedPermission(Permission.ExternalStorageWrite))
        {
            // Si no tiene permisos, solicitarlos
            Permission.RequestUserPermission(Permission.ExternalStorageWrite);
        }

        // Asignar la función al evento onClick del botón
        screenshotButton.onClick.AddListener(TakeScreenshotAndShare);
    }

    public void CheckPermissions()
    {
        // Este método puede ser llamado en cualquier momento para verificar permisos
        if (Permission.HasUserAuthorizedPermission(Permission.ExternalStorageWrite))
        {
            Debug.Log("Permiso concedido para escribir en almacenamiento.");
        }
        else
        {
            Debug.Log("Permiso denegado para escribir en almacenamiento.");
        }
    }

    public void TakeScreenshotAndShare()
    {
        fileName = "Screenshot_" + DateTime.Now.ToString("yyyyMMdd_HHmmss") + ".png";
        // Iniciar la rutina para capturar y compartir la pantalla
        StartCoroutine(CaptureAndShareScreenshot());
    }

    private IEnumerator CaptureAndShareScreenshot()
    {
        // Esperar al final del frame para asegurarse de que todo esté dibujado
        yield return new WaitForEndOfFrame();

        // Tomar la captura de pantalla y guardarla en la carpeta temporal del dispositivo
        Texture2D screenshot = new(Screen.width, Screen.height, TextureFormat.RGB24, false);
        screenshot.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
        screenshot.Apply();

        byte[] imageBytes = screenshot.EncodeToPNG();

        if (AndroidVersionIs11OrAbove())
        {
            SaveImageToGalleryAndShare(imageBytes, fileName);
        }
        else
        {
            SaveImageToExternalStorageAndShare(imageBytes, fileName);
        }
    }

    private bool AndroidVersionIs11OrAbove()
    {
        return (Application.platform == RuntimePlatform.Android && SystemInfo.operatingSystem.StartsWith("Android OS") && int.Parse(SystemInfo.operatingSystem.Split(' ')[2]) >= 11);
    }

    // Guardar en MediaStore (Android 11 o superior) y compartir
    private void SaveImageToGalleryAndShare(byte[] imageBytes, string fileName)
    {
        try
        {
            AndroidJavaClass mediaStoreClass = new("android.provider.MediaStore$Images$Media");
            AndroidJavaObject contentResolver = GetContentResolver();
            AndroidJavaObject contentValues = new("android.content.ContentValues");

            contentValues.Call("put", "title", fileName);
            contentValues.Call("put", "mime_type", "image/png");
            contentValues.Call("put", "relative_path", "Pictures/Screenshots");

            AndroidJavaObject uri = contentResolver.Call<AndroidJavaObject>("insert", mediaStoreClass.GetStatic<AndroidJavaObject>("EXTERNAL_CONTENT_URI"), contentValues);
            if (uri != null)
            {
                AndroidJavaObject outputStream = contentResolver.Call<AndroidJavaObject>("openOutputStream", uri);
                outputStream.Call("write", imageBytes);
                outputStream.Call("flush");
                outputStream.Call("close");

                Debug.Log("Captura guardada en la galería.");
                ShareScreenshot(uri);
            }
            else
            {
                Debug.LogError("No se pudo guardar la imagen en MediaStore.");
            }
        }
        catch (Exception ex)
        {
            Debug.LogError("Error al guardar la captura en MediaStore: " + ex.Message);
        }
    }

    // Guardar en almacenamiento externo (para Android 8 a 10) y compartir
    private void SaveImageToExternalStorageAndShare(byte[] imageBytes, string fileName)
    {
        try
        {
            string directory = GetExternalStorageDirectory();

            if (!Directory.Exists(directory))
            {
                Directory.CreateDirectory(directory);
            }

            string filePath = Path.Combine(directory, fileName);
            File.WriteAllBytes(filePath, imageBytes);
            Debug.Log("Captura guardada en: " + filePath);

            ShareScreenshot(new AndroidJavaObject("java.io.File", filePath));
        }
        catch (Exception ex)
        {
            Debug.LogError("Error al guardar la captura: " + ex.Message);
        }
    }

    // Método para obtener la ruta del almacenamiento externo
    private string GetExternalStorageDirectory()
    {
        AndroidJavaClass environment = new("android.os.Environment");
        string directory = environment.CallStatic<AndroidJavaObject>("getExternalStoragePublicDirectory", environment.GetStatic<string>("DIRECTORY_PICTURES")).Call<string>("getAbsolutePath");

        return directory;
    }

    // Compartir la captura de pantalla
    private void ShareScreenshot(AndroidJavaObject fileOrUri)
    {
        try
        {
            AndroidJavaClass intentClass = new("android.content.Intent");
            AndroidJavaObject intentObject = new("android.content.Intent");

            intentObject.Call<AndroidJavaObject>("setAction", intentClass.GetStatic<string>("ACTION_SEND"));
            intentObject.Call<AndroidJavaObject>("setType", "image/png");

            // Obtener el contexto de Unity
            AndroidJavaClass unityPlayer = new("com.unity3d.player.UnityPlayer");
            AndroidJavaObject currentActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");

            // Si es Android 11 o superior, usa el URI; si es anterior, usa FileProvider
            if (AndroidVersionIs11OrAbove())
            {
                intentObject.Call<AndroidJavaObject>("putExtra", intentClass.GetStatic<string>("EXTRA_STREAM"), fileOrUri);
                intentObject.Call<AndroidJavaObject>("addFlags", 1 << 1); // FLAG_GRANT_READ_URI_PERMISSION
            }
            else
            {
                AndroidJavaClass fileProviderClass = new AndroidJavaClass("androidx.core.content.FileProvider");

                AndroidJavaObject uri = fileProviderClass.CallStatic<AndroidJavaObject>(
                    "getUriForFile",
                    currentActivity,
                    currentActivity.Call<string>("getPackageName") + ".fileprovider",
                    fileOrUri
                );

                intentObject.Call<AndroidJavaObject>("putExtra", intentClass.GetStatic<string>("EXTRA_STREAM"), uri);
                intentObject.Call("addFlags", intentClass.GetStatic<int>("FLAG_GRANT_READ_URI_PERMISSION"));
                //intentObject.Call<AndroidJavaObject>("addFlags", 1 << 1); // FLAG_GRANT_READ_URI_PERMISSION
            }

            AndroidJavaObject chooser = intentClass.CallStatic<AndroidJavaObject>("createChooser", intentObject, "Share Screenshot");
            currentActivity.Call("startActivity", chooser);

            Debug.Log("Cuadro de diálogo de compartir lanzado.");
        }
        catch (Exception ex)
        {
            Debug.LogError("Error al compartir la captura: " + ex.Message);
        }
    }

    // Obtener ContentResolver para Android
    private AndroidJavaObject GetContentResolver()
    {
        AndroidJavaClass unityPlayer = new("com.unity3d.player.UnityPlayer");
        AndroidJavaObject currentActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
        return currentActivity.Call<AndroidJavaObject>("getContentResolver");
    }
}