using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Xml.Linq;
using System.Globalization;
using System.Xml;
using System.Web;

namespace csvTojSon
{
    public class cfgSettings
    {
        public static string bingMapsApiUrl = string.Empty;
        public static string apiKeyBingMaps = string.Empty;
        public static string fileScarti = string.Empty;
        public static string xmlNameSpace = string.Empty;
    }

    public enum GoogleMapsResult
    {
        SUCCESS = 0,
        NOTEXISTS,
        OVER_QUERY_LIMIT
    }

    public class Types
    {
        [System.Serializable]
        [System.Runtime.Serialization.DataContract]
        public class CSV
        {
            [System.Runtime.Serialization.DataContract]
            public class Root
            {
                [System.Runtime.Serialization.DataMember]
                public Record[] results;
            }

            [System.Runtime.Serialization.DataContract]
            public class Record
            {
                [System.Runtime.Serialization.DataMember]
                public string den_istituzione;
                [System.Runtime.Serialization.DataMember]
                public string den_ragione_sociale;
                [System.Runtime.Serialization.IgnoreDataMember]
                public string codice_sede;
                [System.Runtime.Serialization.DataMember]
                public string den_indirizzo;
                [System.Runtime.Serialization.DataMember]
                public string den_localita;
                [System.Runtime.Serialization.DataMember]
                public string cod_cap;
                [System.Runtime.Serialization.IgnoreDataMember]
                public string cod_provincia;
                [System.Runtime.Serialization.DataMember]
                public double latitudine;
                [System.Runtime.Serialization.DataMember]
                public double longitudine;
            }

            [System.Runtime.Serialization.DataMember]
            public Root root;
        }

        [System.Serializable]
        public class GeocoderLocation
        {
            public double Longitude { get; set; }
            public double Latitude { get; set; }

            public override string ToString()
            {
                return String.Format("{0}, {1}", Latitude, Longitude);
            }
        }

        public static GeocoderLocation RecuperaCoordinate(string query)
        {
            GeocoderLocation geo = null;

            //uso la classe System.Net.WebClient per inviare la richiesta GET al servizio REST
            using (var client = new WebClient())
            {
                System.Collections.Specialized.NameValueCollection nvc = System.Configuration.ConfigurationManager.AppSettings;
                cfgSettings.fileScarti = (nvc.AllKeys.Contains("fileScarti") ? nvc["fileScarti"] : string.Empty);
                cfgSettings.bingMapsApiUrl = (nvc.AllKeys.Contains("bingMapsApiUrl") ? nvc["bingMapsApiUrl"] : string.Empty);
                cfgSettings.apiKeyBingMaps = (nvc.AllKeys.Contains("apiKeyBingMaps") ? nvc["apiKeyBingMaps"] : string.Empty);

                var url = string.Format(cfgSettings.bingMapsApiUrl, query.Replace(" ", "+"), cfgSettings.apiKeyBingMaps);

                try
                {
                    //il risultato è un documento XML
                    var risultato = client.DownloadString(url);

                    //Lo vado a leggere con un XmlDocument
                    var doc = new XmlDocument();
                    doc.LoadXml(risultato);

                    //Se voglio interrogare il documento, devo almeno caricare il namespace di default
                    var nsmgr = new XmlNamespaceManager(doc.NameTable);
                    nsmgr.AddNamespace("ns", cfgSettings.xmlNameSpace);

                    //Ora sono pronto, estraggo solo i nodi che mi interessano
                    var location = doc.DocumentElement.SelectSingleNode("//ns:Point", nsmgr);
                    if (location != null)
                    {
                        geo = new GeocoderLocation
                        {
                            Longitude = double.Parse(location.SelectSingleNode("ns:Longitude", nsmgr).InnerText, CultureInfo.InvariantCulture),
                            Latitude = double.Parse(location.SelectSingleNode("ns:Latitude", nsmgr).InnerText, CultureInfo.InvariantCulture)
                        };
                    }
                }
                catch (Exception ex)
                {
                    if (cfgSettings.fileScarti.Trim() != "") System.IO.File.AppendAllText(cfgSettings.fileScarti, ex.Message);
                }

                return geo;
            }
        }
    }
}