using System.Collections;

using NUnit.Framework;

using UnityEngine;
using UnityEngine.TestTools;

using Unity.Netcode;
using Unity.Netcode.Transports.UTP;

using Colosseum.Player;

namespace Colosseum.Tests
{
    /// <summary>
    /// 피격 반응 애니메이션의 속도 배율 반영을 검증하는 PlayMode 테스트입니다.
    /// </summary>
    public class HitReactionAnimationSpeedTests
    {
        private const string AnimatorControllerResourcePath = "AC_Player_Default_PlayModeTest";
        private const string HitStateName = "Hit";
        private const string HitSpeedMultiplierParam = "HitSpeedMultiplier";
        private const float AnimationSampleWindow = 0.08f;

        private GameObject networkManagerObject;
        private NetworkManager networkManager;
        private GameObject playerObject;
        private HitReactionController hitReactionController;
        private Animator animator;

        [UnitySetUp]
        public IEnumerator SetUp()
        {
            CleanupTestObjects();

            networkManagerObject = new GameObject("TestNetworkManager");
            networkManager = networkManagerObject.AddComponent<NetworkManager>();

            UnityTransport transport = networkManagerObject.AddComponent<UnityTransport>();
            transport.SetConnectionData("127.0.0.1", AllocateTestPort());

            networkManager.NetworkConfig = new NetworkConfig
            {
                NetworkTransport = transport,
            };

            Assert.IsTrue(networkManager.StartHost(), "테스트용 호스트 시작에 실패했습니다.");
            yield return null;

            RuntimeAnimatorController controller = Resources.Load<RuntimeAnimatorController>(AnimatorControllerResourcePath);
            Assert.NotNull(controller, $"테스트용 AnimatorController를 찾을 수 없습니다: Resources/{AnimatorControllerResourcePath}");

            playerObject = new GameObject("HitReactionTestPlayer");
            playerObject.SetActive(false);
            playerObject.transform.position = Vector3.zero;

            playerObject.AddComponent<NetworkObject>();
            hitReactionController = playerObject.AddComponent<HitReactionController>();

            GameObject visualObject = new GameObject("Visual");
            visualObject.transform.SetParent(playerObject.transform, false);

            animator = visualObject.AddComponent<Animator>();
            animator.runtimeAnimatorController = controller;
            animator.applyRootMotion = false;

            playerObject.SetActive(true);
            yield return null;

            NetworkObject networkObject = playerObject.GetComponent<NetworkObject>();
            networkObject.SpawnWithOwnership(networkManager.LocalClientId);
            yield return null;

            Assert.NotNull(hitReactionController, "HitReactionController를 생성하지 못했습니다.");
            Assert.NotNull(animator, "테스트용 Animator를 생성하지 못했습니다.");
        }

        [UnityTearDown]
        public IEnumerator TearDown()
        {
            if (networkManager != null && networkManager.IsListening)
            {
                networkManager.Shutdown();
            }

            yield return null;

            CleanupTestObjects();
            yield return null;
        }

        [UnityTest]
        public IEnumerator ApplyStagger_ReusesHitAnimationAndReflectsSpeedMultiplier()
        {
            float slowDelta = 0f;
            yield return MeasureHitPlaybackDelta(
                () => hitReactionController.ApplyStagger(0.4f, true, 0.5f),
                0.5f,
                value => slowDelta = value);

            float fastDelta = 0f;
            yield return MeasureHitPlaybackDelta(
                () => hitReactionController.ApplyStagger(0.4f, true, 2f),
                2f,
                value => fastDelta = value);

            Assert.Greater(slowDelta, 0.01f, "느린 경직 재생에서 normalizedTime이 전진하지 않았습니다.");
            Assert.Greater(fastDelta, slowDelta * 1.75f, $"빠른 경직 재생 전진량이 충분하지 않습니다. slow={slowDelta:F3}, fast={fastDelta:F3}");
        }

        [UnityTest]
        public IEnumerator ApplyKnockback_AlsoAppliesHitAnimationSpeedMultiplier()
        {
            float measuredDelta = 0f;
            yield return MeasureHitPlaybackDelta(
                () => hitReactionController.ApplyKnockback(Vector3.back * 3f, 0.25f, true, 1.6f),
                1.6f,
                value => measuredDelta = value);

            Assert.Greater(measuredDelta, 0.01f, "넉백에서 Hit 애니메이션이 재생되지 않았습니다.");
        }

        private IEnumerator MeasureHitPlaybackDelta(System.Action applyReaction, float expectedSpeedMultiplier, System.Action<float> setMeasuredDelta)
        {
            hitReactionController.ClearHitReactionState();
            animator.Rebind();
            animator.Update(0f);
            yield return null;

            applyReaction.Invoke();
            yield return WaitForHitState();

            float actualMultiplier = animator.GetFloat(HitSpeedMultiplierParam);
            Assert.AreEqual(expectedSpeedMultiplier, actualMultiplier, 0.01f, "Hit 속도 배율 파라미터가 기대값과 다릅니다.");

            float startNormalizedTime = animator.GetCurrentAnimatorStateInfo(0).normalizedTime;
            yield return new WaitForSeconds(AnimationSampleWindow);
            float endNormalizedTime = animator.GetCurrentAnimatorStateInfo(0).normalizedTime;

            setMeasuredDelta(endNormalizedTime - startNormalizedTime);
            yield return null;
        }

        private IEnumerator WaitForHitState()
        {
            int hitStateHash = Animator.StringToHash(HitStateName);

            for (int frame = 0; frame < 120; frame++)
            {
                AnimatorStateInfo stateInfo = animator.GetCurrentAnimatorStateInfo(0);
                if (!animator.IsInTransition(0) && stateInfo.shortNameHash == hitStateHash)
                {
                    yield break;
                }

                yield return null;
            }

            Assert.Fail("Hit 상태 진입을 시간 내에 확인하지 못했습니다.");
        }

        private static ushort AllocateTestPort()
        {
            return (ushort)Random.Range(20000, 40000);
        }

        private void CleanupTestObjects()
        {
            if (playerObject != null)
            {
                Object.DestroyImmediate(playerObject);
                playerObject = null;
            }

            foreach (Camera camera in Object.FindObjectsByType<Camera>(FindObjectsSortMode.None))
            {
                if (camera != null && camera.gameObject.name == "PlayerCamera")
                {
                    Object.DestroyImmediate(camera.gameObject);
                }
            }

            if (networkManagerObject != null)
            {
                Object.DestroyImmediate(networkManagerObject);
                networkManagerObject = null;
                networkManager = null;
            }
        }
    }
}