using SafeMobileLib;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace Dispatcher
{
    public class ReverseGeocodingModule
    {
        public static String osnServer = "192.168.65.130";

        
        public static List<String> CalculateAddressForPositions<T>(List<T> positions)
        {
            List<String> results = new List<string>();
            foreach(ILocationAddress pos in positions)
            {

                if (pos.Lat == 0.0 && pos.Lng == 0.0)
                    continue;

                String address = GetAddressFromOSM(pos.Lat, pos.Lng);
                if (address == null)
                    address = GetAddressFromGoogle(pos.Lat, pos.Lng);

                if(address == null)
                    address = Math.Round(pos.Lat, 5).ToString() + " , " + Math.Round(pos.Lng, 5).ToString();

                results.Add(address);
                pos.Address = address;
            }

            return results;
        }


        public static async Task<List<String>> CalculateAddressForPositionsAsync(List<PositionData> positions)
        {
            List<String> results = new List<string>();

            await Task.Factory.StartNew(() =>
            {
                foreach (ILocationAddress pos in positions)
                {
                    if (pos.Lat == 0.0 && pos.Lng == 0.0)
                        continue;

                    String address = GetAddressFromOSM(pos.Lat, pos.Lng);
                    if (address == null)
                        address = GetAddressFromGoogle(pos.Lat, pos.Lng);

                    if (address == null)
                        address = Math.Round(pos.Lat, 5).ToString() + " , " + Math.Round(pos.Lng, 5).ToString();

                    results.Add(address);
                    pos.Address = address;
                }

            });
            
            return results;
        }





        public static string GetAddressFromGoogle(Double LAT, Double LNG)
        {
            String addr = null;
            try
            {
                XmlDocument doc = new XmlDocument();
                XmlNode element = null;

                doc.Load("http://maps.googleapis.com/maps/api/geocode/xml?latlng=" + (LAT.ToString()).Replace(',', '.')
                    + "," + (LNG.ToString()).Replace(',', '.') + "&sensor=false");
                element = doc.SelectSingleNode("//GeocodeResponse/status");
                if (element.InnerText == "OK")
                {
                    element = doc.SelectSingleNode("//GeocodeResponse/result/formatted_address");
                    addr = element.InnerText.Replace("'", "`");
                    Utils.WriteLine($"Google Reverse Geocoding for [{LAT},{LNG}] is {addr}", ConsoleColor.Green);
                }
                else
                {
                    Utils.WriteLine($"Unable to do Reverse Geocoding from Google for [{LAT},{LNG}]. Response is {element.InnerText}", ConsoleColor.Yellow);

                }
            }
            catch (Exception ex)
            {
                Utils.WriteLine($"Unable to do Reverse Geocoding from Google for [{LAT},{LNG}]", ConsoleColor.Yellow);
                //SM.Debug("Error on address calc:"+ex.ToString());
            }
            //SM.Debug("Prin google:" + addr);  
            return addr;
        }



        public static string GetAddressFromOSM(Double LAT, Double LNG)
        {
            String addr = null;
            try
            {
                XmlDocument doc = new XmlDocument();
                XmlNode element = null;

                string address = $"http://{osnServer}/nominatim/reverse?format=xml&lat=" + (LAT.ToString()).Replace(',', '.') + "&lon=" + (LNG.ToString()).Replace(',', '.') + "&zoom=18&addressdetails=1";
                doc.Load(address);
                //doc.Load("http://nominatim.openstreetmap.org/reverse?format=xml&lat=" + (LAT.ToString()).Replace(',', '.') + "&lon=" + (LNG.ToString()).Replace(',', '.') + "&zoom=18&addressdetails=1");
                //doc.Load("http://89.33.124.4:1142/nominatim/reverse?format=xml&lat=" + (LAT.ToString()).Replace(',', '.') + "&lon=" + (LNG.ToString()).Replace(',', '.') + "&zoom=18&addressdetails=1");
                element = doc.SelectSingleNode("//reversegeocode/result");
                addr = element?.InnerText.Replace("'", "`");
                if (addr == null)
                {
                    element = doc.SelectSingleNode("//reversegeocode/error");
                    addr = element?.InnerText.Replace("'", "`");
                }

                if (addr.Contains("Unable to geocode") || addr.StartsWith("Fail"))
                {
                    addr = null;
                    Utils.WriteLine($"Unable to do Reverse Geocoding from OSM for [{LAT},{LNG}]. Response is {addr}", ConsoleColor.Yellow);
                }
                else
                    Utils.WriteLine($"OSM Reverse Geocoding for [{LAT},{LNG}] is {addr}", ConsoleColor.Green);
            }
            catch (Exception ex)
            {
                Utils.WriteLine($"Unable to do Reverse Geocoding from OSM for [{LAT},{LNG}]", ConsoleColor.Yellow);
            }
            return addr;
        }
    }
}