using System;

using System.Collections.Generic;

using System.Globalization;

using System.IO;

using System.Linq;

using System.Web;

using System.Xml;

using Umbraco.Forms.Core;

namespace Contour.Addons.Countries

{

    public class PrevalueSource : FieldPreValueSourceType 

    {

        public PrevalueSource()

        {

            this.Id = new Guid("9ED6C6D7-16A7-4087-A75D-B936D6FAE5A9");

            this.Name = "List of countries";

            this.Description = "Multilingual list of countries (http://unicode.org/ files need to be in /app_data/countrydata/)";

        }

        public override List<Exception> ValidateSettings()

        {

            var ex = new List<Exception>();

            if (!File.Exists(HttpContext.Current.Server.MapPath("/App_Data/CountryData/common/main/en.xml")))

                ex.Add(new Exception("Unicode Common Locale Data Repository not found, please download from http://cldr.unicode.org and place in /app_data/countrydata/ directory"));

            return ex;

        }

        public override List<PreValue> GetPreValues(Field field)

        {

            var pvs = new List<PreValue>();

            var d = new XmlDocument();

            if (File.Exists(HttpContext.Current.Server.MapPath(

                string.Format("/App_Data/CountryData/common/main/{0}.xml",

                              CultureInfo.CurrentCulture.TwoLetterISOLanguageName))))

            {

                d.Load(HttpContext.Current.Server.MapPath(

                    string.Format("/App_Data/CountryData/common/main/{0}.xml",

                                  CultureInfo.CurrentCulture.TwoLetterISOLanguageName)));

            }

            else

            {

                d.Load(HttpContext.Current.Server.MapPath(

                  "/App_Data/CountryData/common/main/en.xml"));

            }

            var countries = new List<KeyValuePair<string, string>>();

            foreach (XmlNode c in d.SelectNodes("//territory [string-length(string(@type)) < 3]"))

                countries.Add(new KeyValuePair<string, string>(c.Attributes["type"].Value, c.InnerText));

            countries.Sort((firstPair, nextPair) => String.Compare(firstPair.Value, nextPair.Value, StringComparison.Ordinal));

            int sort = 0;

            foreach (var c in countries)

            {

                PreValue pv = new PreValue();

                pv.Id = c.Key;

                pv.Value = c.Value;

                if (field != null)

                    pv.Field = field.Id;

                pv.SortOrder = sort;

                pvs.Add(pv);

                sort++;

            }

            return pvs;

        }

    }

}