using DemonBoss.AI;
using Invector.vCharacterController.AI.FSMBehaviour;
using UnityEngine;
using UnityEngine.Animations;
using UnityEngine.Playables;

namespace DemonBoss.Summoner
{
	/// <summary>
	/// FSM Action: cast a single fireball with optional overlay clip
	/// </summary>
	[CreateAssetMenu(menuName = "Invector/FSM/Actions/Summoner/Cast Fireball")]
	public class SA_CastFireball : vStateAction
	{
		public override string categoryName => "Summoner";
		public override string defaultName => "Cast Fireball";

		[Header("Timing")]
		[Tooltip("Optional delay before the fireball is spawned")]
		public float castDelay = 0f;

		[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 SummonerAI _summoner;
		private bool _castScheduled;

		// --- 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();
				}
			}
			else if (execType == vFSMComponentExecutionType.OnStateExit)
			{
				OnExit();
			}
		}

		private void OnEnter(vIFSMBehaviourController fsm)
		{
			_summoner = fsm.gameObject.GetComponent<SummonerAI>();
			if (_summoner == null)
			{
				if (enableDebug) Debug.LogWarning("[SA_CastFireball] No SummonerAI component found!");
				return;
			}

			_castScheduled = false;

			// Play overlay clip (no Animator params)
			PlayOverlayOnce(fsm.transform);

			if (castDelay > 0f)
			{
				fsm.gameObject.AddComponent<DelayedInvoker>().Init(castDelay, SpawnFireballNow);
				_castScheduled = true;
			}
			else
			{
				SpawnFireballNow();
			}
		}

		private void OnExit()
		{
			StopOverlayImmediate();
			_castScheduled = false;
		}

		private void SpawnFireballNow()
		{
			if (_summoner == null) return;
			_summoner.CastFireball();
			if (enableDebug) Debug.Log("[SA_CastFireball] Fireball cast");
		}

		// ------------------ Overlay helpers ------------------

		private void PlayOverlayOnce(Transform owner)
		{
			if (overlayClip == null || owner == null) return;

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

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

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

			_overlayOutput = AnimationPlayableOutput.Create(_overlayGraph, "AnimOut", anim);
			_overlayOutput.SetSourcePlayable(_overlayPlayable);
			_overlayOutput.SetWeight(1f);

			_overlayGraph.Play();

			float duration = (float)overlayClip.length / Mathf.Max(0.0001f, overlaySpeed);
			_overlayStopAtTime = Time.time + duration;
			_overlayPlaying = true;
		}

		private void StopOverlayWithFade()
		{
			StopOverlayImmediate();
		}

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