using System;

using Android.App;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Content;
using System.Json;
using System.Net;
using System.IO;
using System.Threading.Tasks;

using static Android.Support.V7.Widget.Toolbar;
using Android.Support.V7.App;
using Android.Support.V4.Widget;
using Java.Util;

namespace Upgrid.Droid
{
    [Activity(Label = "", Icon = "@drawable/upgrid", Theme = "@style/MainTheme", MainLauncher = false, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        private string pt = "Utilizador desconhecido";
        private string en = "Unknown user";
        private string loggedUserID;
        private string retrievedCred;
        private string[] credentials = new string[2];
        private SharedPreferences sp = new SharedPreferences();

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            //elimina o utilizador
            //removeUserLogin("Username", "Password");

            //recebe as credenciais do utilizador
            retrievedCred = sp.retrieveCredencials();

            //verifica se o utilizador já tem o login feito ou não
            checkLogin(retrievedCred);

            global::Xamarin.Forms.Forms.Init(this, bundle);
            LoadApplication(new App());
        }


        //verifica se o utilizador já tem o login feito ou não
        private async void checkLogin(string retrievedCred)
        {
            //se o campo das credenciais tiver dados de um utilizador, faz login com esse utilizador
            if (!retrievedCred.Equals("-"))
            {
                string loggedUsername = "";
                string loggedPassword = "";

                string[] words = retrievedCred.Split('-');

                for (int i = 0; i < words.Length; i++)
                {
                    credentials[i] = words[i];
                }

                //username + password
                int j = 0;
                loggedUsername = credentials[j];
                loggedPassword = credentials[j + 1];

                string url = "http://intra.withus.pt:8080/upgrid/api/v1/fakelogin/" + loggedUsername + "/" + loggedPassword;

                //Ler valores do utilizador
                JsonValue json = await FetchUrlAsync(url);

                //Passa diretamente para a páginal inicial da aplicação com os dados do utilizador
                var dashboard = new Intent(this, typeof(Dashboard));
                dashboard.PutExtra("loggedUserID", loggedUserID);           //passa o id do utilizador para acesso a dados
                StartActivity(dashboard);
            }
            else
            {
                //se o campo das credenciais estiver sem dados, pede login ao utilizador

                TabLayoutResource = Resource.Layout.Tabbar;
                ToolbarResource = Resource.Layout.toolbar;

                SetContentView(Resource.Layout.login_layout);

                var userName = FindViewById<EditText>(Resource.Id.usertext);
                var password = FindViewById<EditText>(Resource.Id.passwordtext);
                var loginButton = FindViewById<Button>(Resource.Id.loginButton);

                //Botão para login
                loginButton.Click += async delegate {
                    userName.TextChanged += (object sender, Android.Text.TextChangedEventArgs e) =>
                    {
                        userName.Text = e.Text.ToString();
                    };

                    password.TextChanged += (object sender, Android.Text.TextChangedEventArgs e) =>
                    {
                        password.Text = e.Text.ToString();
                    };

                    //Pedido ao servidor
                    string url = "http://intra.withus.pt:8080/upgrid/api/v1/fakelogin/" + userName.Text + "/" + password.Text;

                    //Ler valores do utilizador
                    JsonValue json = await FetchUrlAsync(url);

                    //Verificar se o utilizador existe
                    checkUser(loggedUserID, userName, password);

                };
            }
        }

        //verifica se o utilizador existe (no caso de não haver credenciais guardadas)
        private void checkUser(string loggedUserID, EditText userName, EditText password)
        {
            //Utilizador desconhecido
            if (loggedUserID.Equals("-1"))
            {
                string language = Locale.Default.Language;
                if (language.Equals("pt"))
                {
                    Toast.MakeText(this, pt, ToastLength.Long).Show();
                }
                else if (language.Equals("en"))
                {
                    Toast.MakeText(this, en, ToastLength.Long).Show();
                }
            }
            else
            {
                sp.saveCredentials(userName.Text, password.Text);      //guardar credenciais de acesso à app
                var dashboard = new Intent(this, typeof(Dashboard));
                dashboard.PutExtra("loggedUserID", loggedUserID);      //passa o id do utilizador para acesso a dados
                StartActivity(dashboard);
            }
        }

        // Gets data from the passed URL.
        private async Task<JsonValue> FetchUrlAsync(string url)
        {
            // Create an HTTP web request using the URL:
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(url));
            request.ContentType = "application/json";
            request.Method = "GET";

            // Send the request to the server and wait for the response:
            using (WebResponse response = await request.GetResponseAsync())
            {
                // Get a stream representation of the HTTP web response:
                using (Stream stream = response.GetResponseStream())
                {
                    // Use this stream to build a JSON document object:
                    JsonValue jsonDoc = await Task.Run(() => JsonObject.Load(stream));
                    //Console.Out.WriteLine("Response: {0}", jsonDoc.ToString());

                    //Get user ID (-1 if not exists)
                    loggedUserID = jsonDoc.ToString();

                    // Return the JSON document:
                    //Console.Out.WriteLine(" - " + jsonDoc.ToString());
                    return jsonDoc;
                }
            }
        }

        public override void OnBackPressed()
        {
            base.OnBackPressed();
        }
    }
}