private static SystemSpec GetNextCandidate(List <SystemSpec> unorderedSystemSpecs, List <SystemSpec> orderedSystemSpecs)
{
var maxDistance = int.MinValue;
SystemSpec candidate = null;
foreach (var systemSpec in unorderedSystemSpecs)
{
// The best candidate has the largest distance from the items that produce their requirements
// so that it does not have to wait long for what it needs.
var minDistance = int.MaxValue;
foreach (var requirement in systemSpec.RequiredResources)
{
var distance = DistanceToProducer(requirement, orderedSystemSpecs);
if (distance == null)
{
goto NextCandidate;
}
minDistance = Math.Min(distance.Value, minDistance);
}
if (minDistance > maxDistance)
{
maxDistance = minDistance;
candidate = systemSpec;
}
NextCandidate : { }
}
return(candidate);
}
public SystemSpec AddSystem <T>()
where T : ISystem, new()
{
var spec = SystemSpec.Construct <T>();
this.SystemSpecs.Add(spec);
return(spec);
}
private static bool AllRequirementsHaveBeenProduced(SystemSpec systemSpec, List <ResourceState> produced) => systemSpec.RequiredResources.All(resource => produced.Contains(resource));
