AdControllerBase.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;
 
namespace SCG.SpaceAdMobile
{
    public abstract class AdControllerBase : IdentifierUtility
    {
        public abstract AdUnitBehaviourBase Ad { get; }

        protected virtual int LoadAsyncPollingDelayMilliseconds => 500;

        public abstract bool Load();

        public virtual async Task<bool> LoadAsync()
        {
            if (!Load())
                return false;
 
            while (!Ad.CanShowAd())
                await Task.Delay(LoadAsyncPollingDelayMilliseconds);
 
            return true;
        }

        public abstract void Show();

        public abstract void Unload();
    }

    public abstract class AdControllerBase<T> : AdControllerBase where T : AdUnitBehaviourBase
    {
        public override AdUnitBehaviourBase Ad => AdUnit;

        [field: SerializeField, Tooltip("Attach the ad unit component that this controller should manage.")]
        protected T AdUnit { get; private set; }

        private static readonly Dictionary<string, T> adInstances = new();

        public T this[string id] => adInstances.GetValueOrDefault(id);
 
#pragma warning disable IDE0031
        public override bool Load() => AdUnit != null && AdUnit.Load();

        public override void Show()
        {
            if (AdUnit != null)
                AdUnit.Show();
        }

        public override void Unload()
        {
            if (AdUnit != null)
                AdUnit.Unload();
        }
#pragma warning restore IDE0031

        protected virtual void Awake()
        {
            if (AdUnit != null)
            {
                if (!AdUnit.TryGetComponent<UndestroyableUtility>(out var undestroyable))
                {
                    throw new UnityException($"Ad object must include a component of type {nameof(UndestroyableUtility)} to ensure it is not inadvertently destroyed.");
                }
 
                if (!undestroyable.IsDestroyed)
                {
                    adInstances.TryAdd(Id, AdUnit);
                }
                else
                {
                    AdUnit = null;
                }
            }
 
            AdUnit ??= this[Id];
 
            if (AdUnit == null)
            {
                throw new UnityException("Failed to assign an Ad object. Ensure the Ad object is properly initialized.");
            }
        }

        protected virtual void OnApplicationQuit()
        {
            Unload();
            adInstances.Clear();
        }
    }
}