using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Locations;
using System.Collections.Generic;
using Android.Util;
using System.Linq;
using System.Net;
using System.IO;
using System.Threading.Tasks;
using System.Json;

namespace Android
{
    [Activity(Label = "LoyaltyCheckIn", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity, ILocationListener
    {
        Location _currentLocation;
        LocationManager _locationManager;

        string _locationProvider;

        TextView txtLatitude;
        TextView txtLongitude;
        Button btnCheckIn;

        static string FS_client_id = "CTGNYYTIIBK2ZHKR1YIG0L43TDZD2ZTPMONRCPP5W2WA1GCY";
        static string FS_client_secret = "UWPCKE3RE5Y2WM0IB340HYR33IATUHJYVOP5BZHECSQE4QOV";
        static string FS_v = "20140806";

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

            SetContentView(Resource.Layout.Main);

            txtLatitude = FindViewById<TextView>(Resource.Id.Latitude);
            txtLongitude = FindViewById<TextView>(Resource.Id.Longitude);
            btnCheckIn = FindViewById<Button>(Resource.Id.btnCheckIn);

            btnCheckIn.Click += async (sender, e) =>
            {
                var lat = _currentLocation.Latitude.ToString();
                var lon = _currentLocation.Longitude.ToString();
                string url = $"https://api.foursquare.com/v2/venues/explore?client_id={FS_client_id}&client_secret={FS_client_secret}&ll={lat},{lon}&v={FS_v}&radius=100";

                JsonValue json = await GetNearbyVenues(url);

                DisplayVenues(json);
            };

            InitializeLocationManager();
        }

        protected override void OnResume()
        {
            base.OnResume();
            string Provider = LocationManager.GpsProvider;

            if (_locationManager.IsProviderEnabled(Provider))
            {
                _locationManager.RequestLocationUpdates(Provider, 2000, 1, this);
            }
            else
            {
            }
        }

        protected override void OnPause()
        {
            base.OnPause();
            _locationManager.RemoveUpdates(this);
        }

        void InitializeLocationManager()
        {
            _locationManager = GetSystemService(Context.LocationService) as LocationManager;
            Criteria locationCriteria = new Criteria();

            locationCriteria.Accuracy = Accuracy.Coarse;
            locationCriteria.PowerRequirement = Power.Medium;

            _locationProvider = _locationManager.GetBestProvider(locationCriteria, true);

            if (_locationProvider != null)
            {
                _locationManager.RequestLocationUpdates(_locationProvider, 2000, 1, this);
            }
            else
            {

            }
        }

        public void OnLocationChanged(Location location)
        {
            _currentLocation = location;
        }

        public void OnProviderDisabled(string provider) { }

        public void OnProviderEnabled(string provider) { }

        public void OnStatusChanged(string provider, Availability status, Bundle extras) { }


        private async Task<JsonValue> GetNearbyVenues(string url)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(url));
            request.ContentType = "application/json";
            request.Method = "GET";

            using (WebResponse response = await request.GetResponseAsync())
            {
                using (Stream stream = response.GetResponseStream())
                {
                    JsonValue jsonDoc = await Task.Run(() => JsonObject.Load(stream));
                    return jsonDoc;
                }
            }
        }

        private void DisplayVenues(JsonValue data)
        {

            for (int i = 0; i < data["response"]["groups"][0]["items"].Count; i++)
            {
                var venueId = data["response"]["groups"][0]["items"][i]["venue"]["id"];
                var venueName = data["response"]["groups"][0]["items"][i]["venue"]["name"];
                var categoryId = data["response"]["groups"][0]["items"][i]["categories"][0]["id"];
                var categoryName = data["response"]["groups"][0]["items"][i]["categories"][0]["name"];

                //TODO: Add clickable label here
            }


        }
    }
}