using Android;
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Runtime;
using Android.Support.V4.App;
using Android.Support.V4.Content;
using Android.Support.V7.App;
using Android.Widget;
using Bank_Document.Core;
using System;
using System.IO;
using System.Threading.Tasks;
 
namespace Bank_Document
{
    [Activity(Label = "@string/app_name"
                , Theme = "@style/AppTheme"
                , MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        public static readonly int PickImageId = 1000;
        TextView TxtViewTitle;
        ImageView ImageDocView;
        Button BtnImgLoadCustom;
        Button BtnFromGallery;
 
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);
 
            //---Parte di personalizzazione
            TxtViewTitle = FindViewById<TextView>(Resource.Id.TxtViewTitle);
            ImageDocView = FindViewById<ImageView>(Resource.Id.ImageDocView);
            BtnImgLoadCustom = FindViewById<Button>(Resource.Id.BtnImgLoadCustom);
            BtnFromGallery = FindViewById<Button>(Resource.Id.BtnFromGallery);
 
            BtnImgLoadCustom.Click += BtnImgLoadCustom_Click;
            BtnFromGallery.Click += BtnFromGallery_Click;
 
            InitializeCustom();
        }
 
        private void InitializeCustom()
        {
            bool isAccessDenied = false;
            string strErrorMsg = string.Empty;
            int nrAttempt4Access = 0;
 
            try
            {
                do
                {
                    strErrorMsg = string.Empty;
                    if (ContextCompat.CheckSelfPermission(this
                                , Manifest.Permission.ReadExternalStorage) != (int)Permission.Granted)
                    {
                        strErrorMsg += "\r\nMissed read permission for external archive";
                        isAccessDenied = true;
                    }
                    if (ContextCompat.CheckSelfPermission(this
                                , Manifest.Permission.WriteExternalStorage) != (int)Permission.Granted)
                    {
                        strErrorMsg += "\r\nMissed write permission for external archive";
                        isAccessDenied = true;
                    }
                    if (isAccessDenied)
                    {
                        var permissions = new string[]
                                            {
                                                Manifest.Permission.ReadExternalStorage,
                                                Manifest.Permission.WriteExternalStorage
                                            };
                        // RequestCode REQUEST_FOLDER_PERMISSION = 9?
                        ActivityCompat.RequestPermissions(this, permissions, 9);
 
                        Task.Delay(4000).Wait(); //Attesa di 4 secondi
                        isAccessDenied = ContextCompat.CheckSelfPermission(this, Manifest.Permission.ReadExternalStorage) != (int)Permission.Granted
                                    || ContextCompat.CheckSelfPermission(this, Manifest.Permission.WriteExternalStorage) != (int)Permission.Granted;
                    }
                } while (isAccessDenied && nrAttempt4Access < 3);
                if (isAccessDenied && nrAttempt4Access == 3)
                {
                    throw new Exception("Permissions are mandatory!\r\n" + strErrorMsg);
                }
            }
            catch (System.Exception ex)
            {
                AManager.MessageBox(this, "InitializeCustom", ex.Message);
            }
        }
 
        private void BtnFromGallery_Click(object sender, System.EventArgs e)
        {
            try
            {
                Intent = new Intent();
                Intent.SetType("image/*");
                Intent.SetAction(Intent.ActionGetContent);
                StartActivityForResult(Intent.CreateChooser(Intent, "Select Picture")
                                    , PickImageId);
            }
            catch (System.Exception ex)
            {
                AManager.MessageBox(this, "BtnFromGallery", ex.Message);
            }
        }
 
        // Create a Method OnActivityResult(it is select the image controller)   
        protected override void OnActivityResult(int requestCode, Result resultCode
                                               , Intent data)
        {
            if ((requestCode == PickImageId) 
                && (resultCode == Result.Ok) 
                && (data != null))
            {
                Android.Net.Uri uri = data.Data;
                string strFileName = Path.GetFileName(uri.Path);
                TxtViewTitle.Text = strFileName;
                ImageDocView.SetImageURI(uri);
            }
        }
 
        private void BtnImgLoadCustom_Click(object sender, System.EventArgs e)
        {
            try
            {
                string rootPath = "/storage/emulated/0/";
                string relativePath = "MiaCartella/Doc/fileImmagine.jpg";
                Java.IO.File fileImage = new Java.IO.File(rootPath + relativePath);
 
                Android.Net.Uri uri = Android.Net.Uri.FromFile(fileImage);
                ImageDocView.SetImageURI(uri);
            }
            catch (System.Exception ex)
            {
                AManager.MessageBox(this, "BtnImgLoadCustom", ex.Message);
            }
        }
 
        //etc... non serve
        public override void OnRequestPermissionsResult(int requestCode, string[] permissions
                                , [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions
                                                                , grantResults);
 
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}