#nullable enable

using System.Collections;
using Cysharp.Threading.Tasks;
using NUnit.Framework;
using UnityEngine;
using UnityEngine.TestTools;

namespace ShrinkEventBus.PlayMode.Tests
{
    internal readonly struct MonoLifecycleEvent : IShrinkEvent
    {
        public MonoLifecycleEvent(int value) => Value = value;
        public int Value { get; }
    }

    internal readonly struct AwakeToDestroyEvent : IShrinkEvent
    {
        public AwakeToDestroyEvent(int value) => Value = value;
        public int Value { get; }
    }

    [ShrinkEventSubscriber(
        DefaultBus = "game",
        Lifetime = ShrinkSubscriberLifetime.AwakeToDestroy)]
    internal sealed class AwakeToDestroyTarget : MonoBehaviour
    {
        public static int Sum { get; set; }
        public static int AwakeCalls { get; set; }
        public static int DestroyCalls { get; set; }

        private void Awake() => AwakeCalls++;
        private void OnDestroy() => DestroyCalls++;

        [ShrinkSubscribe]
        private void OnEvent(AwakeToDestroyEvent value) => Sum += value.Value;
    }

    [ShrinkEventSubscriber(Lifetime = ShrinkSubscriberLifetime.AwakeToDestroy)]
    internal abstract class AbstractAwakeToDestroyTarget : MonoBehaviour
    {
        public static int Sum { get; set; }

        [ShrinkSubscribe]
        private void OnEvent(AwakeToDestroyEvent value) => Sum += value.Value;
    }

    internal sealed class ConcreteAwakeToDestroyTarget : AbstractAwakeToDestroyTarget
    {
    }

    [ShrinkEventSubscriber(DefaultBus = "game")]
    internal sealed class MonoLifecycleTarget : MonoBehaviour
    {
        public int Sum { get; private set; }

        [ShrinkSubscribe]
        private void OnEvent(MonoLifecycleEvent value) => Sum += value.Value;
    }

    public sealed class ShrinkMonoEventScopePlayModeTests
    {
        [UnityTest]
        public IEnumerator AwakeToDestroyLifetimeIsInjectedWithoutManualBinding()
        {
            AwakeToDestroyTarget.Sum = 0;
            AwakeToDestroyTarget.AwakeCalls = 0;
            AwakeToDestroyTarget.DestroyCalls = 0;
            var gameObject = new GameObject("ShrinkEventBus-AwakeToDestroy");
            var target = gameObject.AddComponent<AwakeToDestroyTarget>();

            yield return null;
            Assert.IsInstanceOf<IShrinkGeneratedSubscriber>(target);
            Assert.AreEqual(1, AwakeToDestroyTarget.AwakeCalls);
            yield return EventBus.PostAsync(new AwakeToDestroyEvent(3)).ToCoroutine();
            Assert.AreEqual(3, AwakeToDestroyTarget.Sum);

            gameObject.SetActive(false);
            yield return null;
            yield return EventBus.PostAsync(new AwakeToDestroyEvent(5)).ToCoroutine();
            Assert.AreEqual(8, AwakeToDestroyTarget.Sum,
                "AwakeToDestroy subscriptions must survive OnDisable.");

            Object.Destroy(gameObject);
            yield return null;
            Assert.AreEqual(1, AwakeToDestroyTarget.DestroyCalls);
            yield return EventBus.PostAsync(new AwakeToDestroyEvent(7)).ToCoroutine();
            Assert.AreEqual(8, AwakeToDestroyTarget.Sum,
                "The generated OnDestroy release must remove the subscription.");
        }

        [UnityTest]
        public IEnumerator AwakeToDestroyLifetimeSupportsAbstractSubscriberBasesWithoutLifecycleMethods()
        {
            AbstractAwakeToDestroyTarget.Sum = 0;
            var gameObject = new GameObject("ShrinkEventBus-AbstractAwakeToDestroy");
            var target = gameObject.AddComponent<ConcreteAwakeToDestroyTarget>();

            yield return null;
            Assert.IsInstanceOf<IShrinkGeneratedSubscriber>(target);
            yield return EventBus.PostAsync(new AwakeToDestroyEvent(11)).ToCoroutine();
            Assert.AreEqual(11, AbstractAwakeToDestroyTarget.Sum);

            Object.Destroy(gameObject);
            yield return null;
            yield return EventBus.PostAsync(new AwakeToDestroyEvent(13)).ToCoroutine();
            Assert.AreEqual(11, AbstractAwakeToDestroyTarget.Sum);
        }

        [UnityTest]
        public IEnumerator OnEnableAttachesAndOnDisableReleases()
        {
            var gameObject = new GameObject("ShrinkMonoEventScope-PlayMode");
            gameObject.SetActive(false);
            var target = gameObject.AddComponent<MonoLifecycleTarget>();
            gameObject.AddComponent<ShrinkMonoEventScope>();

            gameObject.SetActive(true);
            yield return null;
            yield return EventBus.PostAsync(new MonoLifecycleEvent(3)).ToCoroutine();
            Assert.AreEqual(3, target.Sum);

            gameObject.SetActive(false);
            yield return null;
            yield return EventBus.PostAsync(new MonoLifecycleEvent(5)).ToCoroutine();
            Assert.AreEqual(3, target.Sum);
            Object.Destroy(gameObject);
        }
    }
}