using MoonTools.ECS;

namespace Nerfed.Runtime.Scheduling;

public sealed class SystemScheduleEntry
{
    public SystemScheduleEntry(
        MoonTools.ECS.System system,
        SystemSchedulePhase phase,
        string[] dependsOn,
        int registrationIndex)
    {
        System = system;
        Phase = phase;
        DependsOn = dependsOn ?? Array.Empty<string>();
        RegistrationIndex = registrationIndex;

        if (system is IParallelSystemMetadata metadata)
        {
            Name = metadata.ScheduleName;
            Access = metadata.AccessDeclaration;
        }
        else
        {
            Name = system.GetType().Name;
            // Unknown systems are treated as structural to preserve safety until metadata is declared.
            Access = new SystemAccessDeclaration(new ComponentAccess(typeof(object), SystemAccessMode.StructuralWrite));
        }
    }

    public MoonTools.ECS.System System { get; }
    public string Name { get; }
    public SystemSchedulePhase Phase { get; }
    public string[] DependsOn { get; }
    public int RegistrationIndex { get; }
    public SystemAccessDeclaration Access { get; }
}