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namespace GMap.NET.MapProviders
{
   using System;

   /// <summary>
   /// YahooSatelliteMap provider
   /// </summary>
   public class YahooSatelliteMapProvider : YahooMapProviderBase
   {
      public static readonly YahooSatelliteMapProvider Instance;

      YahooSatelliteMapProvider()
      {
      }

      static YahooSatelliteMapProvider()
      {
         Instance = new YahooSatelliteMapProvider();
      }

      public string Version = "1.9";

      #region GMapProvider Members

      readonly Guid id = new Guid("55D71878-913F-4320-B5B6-B4167A3F148F");
      public override Guid Id
      {
         get
         {
            return id;
         }
      }

      readonly string name = "YahooSatelliteMap";
      public override string Name
      {
         get
         {
            return name;
         }
      }

      public override PureImage GetTileImage(GPoint pos, int zoom)
      {
         string url = MakeTileImageUrl(pos, zoom, LanguageStr);

         return GetTileImageUsingHttp(url);
      }

      #endregion

      string MakeTileImageUrl(GPoint pos, int zoom, string language)
      {
         // http://maps3.yimg.com/ae/ximg?v=1.9&t=a&s=256&.intl=en&x=15&y=7&z=7&r=1

         return string.Format(UrlFormat, ((GetServerNum(pos, 2)) + 1), Version, language, pos.X, (((1 << zoom) >> 1) - 1 - pos.Y), (zoom + 1));
      }

      static readonly string UrlFormat = "http://maps{0}.yimg.com/ae/ximg?v={1}&t=a&s=256&.intl={2}&x={3}&y={4}&z={5}&r=1";
   }
}