using Invector.vCharacterController.AI.FSMBehaviour;
using Lean.Pool;
using UnityEngine;
using UnityEngine.Animations;
using UnityEngine.Playables;

namespace DemonBoss.Magic
{
	/// <summary>
	/// Spawns a meteor behind the BOSS and launches it toward the player's position.
	/// </summary>
	[CreateAssetMenu(menuName = "Invector/FSM/Actions/DemonBoss/Call Meteor")]
	public class SA_CallMeteor : vStateAction
	{
		public override string categoryName => "DemonBoss/Magic";
		public override string defaultName => "Call Meteor";

		[Header("Meteor Setup")]
		[Tooltip("Prefab with MeteorProjectile component")]
		public GameObject meteorPrefab;

		[Tooltip("Distance behind the BOSS to spawn meteor (meters)")]
		public float behindBossDistance = 3f;

		[Tooltip("Height above the BOSS to spawn meteor (meters)")]
		public float aboveBossHeight = 8f;

		[Tooltip("Delay before meteor spawns (wind-up)")]
		public float castDelay = 0.4f;

		[Header("Targeting")]
		[Tooltip("Tag used to find the target (usually Player)")]
		public string targetTag = "Player";

		[Header("One-off Overlay Clip (No Animator Params)")]
		public AnimationClip overlayClip;

		[Tooltip("Playback speed (1 = normal)")] public float overlaySpeed = 1f;
		[Tooltip("Blend-in seconds (instant in this minimal impl)")] public float overlayFadeIn = 0.10f;
		[Tooltip("Blend-out seconds (instant in this minimal impl)")] public float overlayFadeOut = 0.10f;

		[Header("Debug")]
		public bool enableDebug = false;

		private Transform _boss;
		private Transform _target;

		// --- Playables runtime ---
		private PlayableGraph _overlayGraph;

		private AnimationPlayableOutput _overlayOutput;
		private AnimationClipPlayable _overlayPlayable;
		private bool _overlayPlaying;
		private float _overlayStopAtTime;

		public override void DoAction(vIFSMBehaviourController fsm, vFSMComponentExecutionType execType = vFSMComponentExecutionType.OnStateUpdate)
		{
			if (execType == vFSMComponentExecutionType.OnStateEnter)
			{
				OnEnter(fsm);
			}
			else if (execType == vFSMComponentExecutionType.OnStateUpdate)
			{
				if (_overlayPlaying && Time.time >= _overlayStopAtTime) StopOverlayWithFade();
			}
		}

		private void OnEnter(vIFSMBehaviourController fsm)
		{
			_boss = fsm.transform;
			_target = GameObject.FindGameObjectWithTag(targetTag)?.transform;

			if (_target == null)
			{
				if (enableDebug) Debug.LogWarning("[SA_CallMeteor] No target found – abort");
				return;
			}

			if (enableDebug) Debug.Log($"[SA_CallMeteor] Boss: {_boss.name}, Target: {_target.name}");

			// Fire overlay clip (no Animator params)
			PlayOverlayOnce(_boss);

			// Optional: wait for castDelay before spawning (simple timer via Invoke)
			if (castDelay > 0f)
				_boss.gameObject.AddComponent<DelayedInvoker>().Init(castDelay, SpawnMeteor);
			else
				SpawnMeteor();
		}

		private void SpawnMeteor()
		{
			if (meteorPrefab == null)
			{
				if (enableDebug) Debug.LogError("[SA_CallMeteor] Missing meteorPrefab");
				return;
			}

			if (_boss == null || _target == null)
			{
				if (enableDebug) Debug.LogError("[SA_CallMeteor] Missing boss or target reference");
				return;
			}

			// Calculate spawn position: behind the BOSS + height
			Vector3 bossForward = _boss.forward.normalized;
			Vector3 behindBoss = _boss.position - (bossForward * behindBossDistance);
			Vector3 spawnPos = behindBoss + Vector3.up * aboveBossHeight;

			if (enableDebug) Debug.Log($"[SA_CallMeteor] Spawning meteor at: {spawnPos}");

			// Spawn the meteor
			var meteorGO = LeanPool.Spawn(meteorPrefab, spawnPos, Quaternion.identity);

			// Configure the projectile to target the player
			var meteorScript = meteorGO.GetComponent<MeteorProjectile>();
			if (meteorScript != null)
			{
				// Set it to target the player's current position
				meteorScript.useOverrideImpactPoint = true;
				meteorScript.overrideImpactPoint = _target.position;
				meteorScript.snapImpactToGround = true;

				if (enableDebug) Debug.Log($"[SA_CallMeteor] Meteor configured to target: {_target.position}");
			}
			else
			{
				if (enableDebug) Debug.LogError("[SA_CallMeteor] Meteor prefab missing MeteorProjectile component!");
			}
		}

		// -------- Playables helpers (no Animator params) --------
		private void PlayOverlayOnce(Transform owner)
		{
			if (overlayClip == null) return;

			var animator = owner.GetComponent<Animator>();
			if (animator == null) return;

			StopOverlayImmediate();

			_overlayGraph = PlayableGraph.Create("ActionOverlay(CallMeteor)");
			_overlayGraph.SetTimeUpdateMode(DirectorUpdateMode.GameTime);

			_overlayPlayable = AnimationClipPlayable.Create(_overlayGraph, overlayClip);
			_overlayPlayable.SetApplyFootIK(false);
			_overlayPlayable.SetApplyPlayableIK(false);
			_overlayPlayable.SetSpeed(Mathf.Max(0.0001f, overlaySpeed));

			_overlayOutput = AnimationPlayableOutput.Create(_overlayGraph, "AnimOut", animator);
			_overlayOutput.SetSourcePlayable(_overlayPlayable);

			_overlayOutput.SetWeight(1f);
			_overlayGraph.Play();
			_overlayPlaying = true;

			float len = overlayClip.length / Mathf.Max(0.0001f, overlaySpeed);
			_overlayStopAtTime = Time.time + len;

			if (enableDebug) Debug.Log("[SA_CallMeteor] Overlay clip started via Playables");
		}

		private void StopOverlayImmediate()
		{
			if (_overlayGraph.IsValid())
			{
				_overlayGraph.Stop();
				_overlayGraph.Destroy();
			}
			_overlayPlaying = false;
		}

		private void StopOverlayWithFade()
		{
			if (!_overlayPlaying) { StopOverlayImmediate(); return; }
			if (_overlayOutput.IsOutputNull() == false) _overlayOutput.SetWeight(0f);
			StopOverlayImmediate();
			if (enableDebug) Debug.Log("[SA_CallMeteor] Overlay clip stopped");
		}

		/// <summary>
		/// Tiny helper MonoBehaviour to delay a callback without coroutines here.
		/// </summary>
		private sealed class DelayedInvoker : MonoBehaviour
		{
			private float _timeLeft;
			private System.Action _callback;

			public void Init(float delay, System.Action callback)
			{
				_timeLeft = delay;
				_callback = callback;
			}

			private void Update()
			{
				_timeLeft -= Time.deltaTime;
				if (_timeLeft <= 0f)
				{
					try { _callback?.Invoke(); }
					finally { Destroy(this); }
				}
			}
		}
	}
}