make structure

add tests

SatelliteProvider.Common/DTO/SatTile.cs

@@ -0,0 +1,32 @@
+using SatelliteProvider.Common.Utils;
+
+namespace SatelliteProvider.Common.DTO;
+
+public class SatTile
+{
+    public int X { get; }
+    public int Y { get; }
+    public int Zoom { get; }
+    public GeoPoint LeftTop { get; }
+    public GeoPoint BottomRight { get; }
+    public string Url { get; set; }
+
+
+    public SatTile(int x, int y, int zoom, string url)
+    {
+        X = x;
+        Y = y;
+        Zoom = zoom;
+        Url = url;
+
+        LeftTop = GeoUtils.TileToWorldPos(x, y, zoom);
+        BottomRight = GeoUtils.TileToWorldPos(x + 1, y + 1, zoom);
+    }
+
+    public string FileName => $"{X}.{Y}.{Zoom}.jpg";
+
+    public override string ToString()
+    {
+        return $"Tile[X={X}, Y={Y}, TL=({LeftTop.Lat:F6}, {LeftTop.Lon:F6}), BR=({BottomRight.Lat:F6}, {BottomRight.Lon:F6})]";
+    }
+}