/// <summary>
/// Checks if the <paramref name="track"/> is valid, so every property is readed.
/// </summary>
/// <param name="track">The <see cref="DriverlessTrack"/> that you want to check.</param>
/// <returns>True if every parameter is readed and false if at least one of them is missing.</returns>
private static bool CheckTrack(ref DriverlessTrack track)
{
return(!track.Name.Equals(string.Empty) &&
track.Width > 0 &&
track.Length > 0 &&
track.RightSide.Count > 0 &&
track.LeftSide.Count > 0 &&
track.Center.Count > 0);
}
/// <summary>
/// Add <see cref="DriverlessTrack"/> to <see cref="DriverlessTracks"/>.
/// </summary>
/// <param name="track">Loaded <see cref="DriverlessTracks"/>.</param>
/// <param name="errorSnackbar"><see cref="Snackbar"/> that shows erro message.</param>
private static void AddTrack(DriverlessTrack track)
{
if (CheckTrack(ref track))
{
DriverlessTracks.Add(track);
}
else
{
throw new Exception("Straight track can't be loaded because something is missing.");
}
}
/// <summary>
/// Parses a <see cref="Point"/> from the readed <b>x</b> and <b>y</b> coordinate.
/// </summary>
/// <param name="coordinateX">Readed <b>x</b> coordinate in string</param>
/// <param name="coordinateY">Readed <b>y</b> coordinate in string</param>
/// <param name="parsingError"></param>
/// <param name="track"></param>
/// <param name="errorSnackbar"></param>
/// <returns>A <see cref="Point"/>.</returns>
private static Point ParsePoint(string coordinateX, string coordinateY, ref DriverlessTrack track)
{
var point = new Point();
if (double.TryParse(coordinateX, out double x))
{
point.X = x;
}
else
{
throw new Exception($"In track \"{track.Name}\" couldn't convert x coordinate \"{coordinateX}\" to a number");
}
if (double.TryParse(coordinateY, out double y))
{
point.Y = y;
}
else
{
throw new Exception($"In track \"{track.Name}\" couldn't convert y coordinate \"{coordinateY}\" to a number");
}
return(point);
}
/// <summary>
/// Loads a <see cref="DriverlessTrack"/> from file.
/// </summary>
/// <param name="fileName">The JSON file name that contains the track data.</param>
/// <param name="errorSnackbar"><see cref="Snackbar"/> that shows erro message.</param>
/// <returns>Readed <see cref="DriverlessTrack"/>.</returns>
public static DriverlessTrack LoadTrack(string fileName)
{
var track = new DriverlessTrack();
if (File.Exists(fileName))
{
if (new FileInfo(fileName).Length == 0)
{
throw new Exception($"{fileName} is empty");
}
using var reader = new StreamReader(fileName);
dynamic trackJSON = new object();
try
{
trackJSON = JsonConvert.DeserializeObject(reader.ReadToEnd());
}
catch (JsonReaderException)
{
throw new Exception($"Can't deserialize {fileName}");
}
if (trackJSON.track == null)
{
throw new Exception("Track is null");
}
if (trackJSON.track.name == null)
{
throw new Exception("Track name is null");
}
if (trackJSON.track.width == null)
{
throw new Exception("Track width is null");
}
if (trackJSON.track.length == null)
{
throw new Exception("Track length is null");
}
if (trackJSON.track.leftSide == null)
{
throw new Exception($"In track '{track.Name}' left side is empty!");
}
if (trackJSON.track.centerSide == null)
{
throw new Exception($"In track '{track.Name}' center is empty!");
}
if (trackJSON.track.rightSide == null)
{
throw new Exception($"In track '{track.Name}' right side is empty!");
}
if (trackJSON.track.name.ToString().Equals(string.Empty))
{
throw new Exception("Track name is empty");
}
if (!float.TryParse(trackJSON.track.width.ToString(), out float width))
{
throw new Exception($"In track '{track.Name}' couldn't convert '{trackJSON.track.width}' to a number");
}
if (!float.TryParse(trackJSON.track.length.ToString(), out float length))
{
throw new Exception($"In track '{track.Name}' couldn't convert '{trackJSON.track.length}' to a number");
}
if (trackJSON.track.rightSide.Count == 0)
{
throw new Exception("Track right side is empty");
}
if (trackJSON.track.leftSide.Count == 0)
{
throw new Exception("Track left side is empty");
}
if (trackJSON.track.centerSide.Count == 0)
{
throw new Exception("Track center is empty");
}
track.Name = trackJSON.track.name;
track.Width = width;
track.Length = length;
for (int i = 0; i < trackJSON.track.rightSide.Count; i++)
{
if (trackJSON.track.rightSide[i].x == null)
{
throw new Exception("Track right side x value is empty");
}
if (trackJSON.track.rightSide[i].y == null)
{
throw new Exception("Track right side y value is empty");
}
track.RightSide.Add(ParsePoint(trackJSON.track.rightSide[i].x.ToString(), trackJSON.track.rightSide[i].y.ToString(), ref track));
}
for (int i = 0; i < trackJSON.track.leftSide.Count; i++)
{
if (trackJSON.track.leftSide[i].x == null)
{
throw new Exception("Track left side x value is empty");
}
if (trackJSON.track.leftSide[i].y == null)
{
throw new Exception("Track left side y value is empty");
}
track.LeftSide.Add(ParsePoint(trackJSON.track.leftSide[i].x.ToString(), trackJSON.track.leftSide[i].y.ToString(), ref track));
}
for (int i = 0; i < trackJSON.track.centerSide.Count; i++)
{
if (trackJSON.track.leftSide[i].x == null)
{
throw new Exception("Track center x value is empty");
}
if (trackJSON.track.leftSide[i].y == null)
{
throw new Exception("Track center y value is empty");
}
track.Center.Add(ParsePoint(trackJSON.track.centerSide[i].x.ToString(), trackJSON.track.centerSide[i].y.ToString(), ref track));
}
}
else
{
throw new Exception($"Can't find '{fileName}'");
}
return(track);
}
