public void Build(string[] orbits)
{
CenterOfMass = new OrbitingObject("COM", 0);
CenterOfMass.OrbitingObjects.AddRange(GetOrbitingObjects(orbits, CenterOfMass.Name, 0));
OrbitChecksum += CenterOfMass.OrbitingObjects.Sum(o => o.OrbitLevel);
}
private static OrbitingObject?FindOrbitingObject(OrbitingObject orbitingObject, string nameToFind)
{
OrbitingObject?result = null;
if (orbitingObject.OrbitingObjects.Any(o => o.Name == nameToFind))
{
result = orbitingObject;
}
else if (orbitingObject.OrbitingObjects.Count > 0)
{
result = orbitingObject.OrbitingObjects.Select(oo => FindOrbitingObject(oo, nameToFind))
.SingleOrDefault(oo => oo != null);
}
return(result);
}
private IEnumerable <OrbitingObject> GetOrbitingObjects(string[] orbits, string name, int currentOrbitLevel)
{
var orbitingObjects = new List <OrbitingObject>();
// Need to add the ')' or C and COM both match and an infinite loop occurs.
foreach (var orbit in orbits.Where(o => o.StartsWith($"{name})")))
{
var orbitingObject = new OrbitingObject(orbit.Substring(orbit.IndexOf(')') + 1), currentOrbitLevel + 1);
if (orbits.Any(o => o.StartsWith(orbitingObject.Name)))
{
orbitingObject.OrbitingObjects.AddRange(
GetOrbitingObjects(orbits, orbitingObject.Name, currentOrbitLevel + 1));
}
orbitingObjects.Add(orbitingObject);
OrbitChecksum += orbitingObject.OrbitingObjects.Sum(o => o.OrbitLevel);
}
return(orbitingObjects);
}
