ShipCoordinator.cs

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class ShipCoordinator : MonoBehaviour
{
    private Dictionary<System, NowOrEvent> State = new Dictionary<System, NowOrEvent>();

    [Flags]
    public enum System { None = 0, Pathfinding = 1, WorkStations = 2, DoorManager = 4, GasSystem = 8, Crew = 16 }

    private NowOrEvent AddSystem(System system)
    {
        var now = new NowOrEvent { System = system };
        State.Add(system, now);
        return now;
    }

    private void Start()
    {
        Invoke(nameof(WarnForMissing), 5f);
    }

    private void WarnForMissing()
    {
        foreach(var s in State)
        {
            if(s.Value.Ready == false)
            {
                Debug.Log($"{s.Value.System} was not ready after 5 seconds");
            }
        }
    }

    public void WaitFor(UnityAction action, params System[] systems)
    {
        if (systems == null || systems.Length == 0)
            throw new ArgumentException("No systems supplied", nameof(systems));

        int remaining = 0;
        UnityAction onReady = null;

        // local helper to detach all listeners
        void Unsubscribe()
        {
            foreach (var s in systems)
                State[s].ReadyEvent.RemoveListener(onReady);
        }

        onReady = () =>
        {
            if (--remaining == 0)
            {
                Unsubscribe();
                action();
            }
        };

        foreach (var s in systems)
        {
            if (!State.TryGetValue(s, out var entry))
            {
                Debug.Log($"System {s} not registered, adding");
                entry = AddSystem(s);
            }

            if (entry.Ready) continue;

            remaining++;
            entry.ReadyEvent.AddListener(onReady);
        }

        // all were already ready
        if (remaining == 0) action();
    }

    public void SystemReady(System sys)
    {
        if (State.TryGetValue(sys, out var now))
        {
            if(!now.Ready)
            {
                now.Ready = true;
                now.ReadyEvent.Invoke();
            }
            else
            {
                if(sys != System.Crew)
                    Debug.LogError($"System {sys} Ready was already called once!", this);
            }
        }
        else
        {
            var newnow = AddSystem(sys);
            newnow.Ready = true;
        }
    }

    public class NowOrEvent
    {
        public System System;
        public bool Ready;
        public UnityEvent ReadyEvent = new UnityEvent();
    }
}