using Invector;
using Invector.vCharacterController.AI;
using System.Collections;
using System.Collections.Generic;
using Lean.Pool;
using UnityEngine;

namespace DemonBoss.Summoner
{
	/// <summary>
	/// Main AI controller for Summoner enemy
	/// Manages spawned minions and provides combat state tracking
	/// Attach to Summoner character along with vControlAI
	/// </summary>
	public class SummonerAI : MonoBehaviour
	{
		[Header("Minion Management")]
		[Tooltip("Prefab of minion to spawn")]
		public GameObject minionPrefab;

		[Tooltip("Maximum number of minions alive at once")]
		public int maxActiveMinions = 3;

		[Tooltip("Distance from summoner to spawn minions")]
		public float spawnRadius = 5f;

		[Tooltip("Height offset for spawn position")]
		public float spawnHeightOffset = 0f;

		[Tooltip("Should minions look at summoner after spawn?")]
		public bool minionsLookAtCenter = false;

		[Header("Spawn Configuration")]
		[Tooltip("Number of minions to spawn per summon action")]
		public int minionsPerSummon = 3;

		[Tooltip("Delay before first minion spawns")]
		public float initialSpawnDelay = 0.5f;

		[Tooltip("Time between spawning each minion")]
		public float timeBetweenSpawns = 0.3f;

		[Header("Combat Behavior")]
		[Tooltip("Minimum distance to player before engaging in melee")]
		public float meleeEngageDistance = 3f;

		[Header("Melee Cooldown")]
		[Tooltip("Minimum seconds between melee attacks")]
		public float meleeCooldownMin = 5f;

		[Tooltip("Maximum seconds between melee attacks")]
		public float meleeCooldownMax = 8f;

		[Tooltip("Preferred safe distance from player (used for flee/spacing)")]
		public float safeDistance = 8f;

		[Tooltip("Should summoner fight when minions are alive?")]
		public bool fightWithMinions = false;

		[Tooltip("Health percentage threshold to spawn minions (0-1)")]
		[Range(0f, 1f)]
		public float healthThresholdForSummon = 0.7f;

		[Header("Targeting")]
		[Tooltip("Tag to find player")]
		public string playerTag = "Player";

		[Header("Effects")]
		[Tooltip("Particle effect at spawn location")]
		public GameObject spawnEffectPrefab;

		[Tooltip("Sound played when spawning minions")]
		public AudioClip summonSound;

		[Header("Summon Restrictions")]
		[Tooltip("If true, summoner will only summon when no minions are alive")]
		public bool requireZeroMinionsToSummon = true;

		[Header("Spell Casting")]
		[Tooltip("Fireball prefab (projectile handles its own targeting)")]
		public GameObject fireballPrefab;

		[Tooltip("Optional spawn pivot for spells (e.g. staff tip). If null, uses summoner transform.")]
		public Transform spellSpawnPivot;

		[Tooltip("Cooldown between spell casts (seconds)")]
		public float spellCooldown = 6f;

		[Tooltip("Minimum distance required to cast spell")]
		public float spellMinDistance = 5f;

		[Tooltip("Maximum distance allowed to cast spell (0 = no limit)")]
		public float spellMaxDistance = 20f;

		[Tooltip("Only cast spell when minions are alive")]
		public bool spellRequiresMinionsAlive = true;

		[Header("Debug")]
		[Tooltip("Enable debug logging")]
		public bool enableDebug = false;

		[Tooltip("Show gizmos in Scene View")]
		public bool showGizmos = true;

		// Runtime state
		private List<GameObject> activeMinions = new List<GameObject>();

		private Transform playerTransform;
		private AudioSource audioSource;
		private vHealthController healthController;
		private bool isSpawning = false;
		private Coroutine spawnCoroutine;
		private float lastSpellTime = -999f;
		private bool spawnRequested = false;
		private float nextMeleeTime = 0f;

		// Public properties for FSM decisions
		public bool IsSpawning => isSpawning;

		public int ActiveMinionCount => activeMinions.Count;
		public bool CanSpawnMinions
		{
			get
			{
				if (isSpawning) return false;
				if (requireZeroMinionsToSummon && activeMinions.Count > 0) return false;
				return activeMinions.Count < maxActiveMinions;
			}
		}
		public bool HasActiveMinions => activeMinions.Count > 0;

		private void Awake()
		{
			healthController = GetComponent<vHealthController>();

			audioSource = GetComponent<AudioSource>();
			if (audioSource == null && summonSound != null)
			{
				audioSource = gameObject.AddComponent<AudioSource>();
				audioSource.playOnAwake = false;
				audioSource.spatialBlend = 1f;
			}
		}

		private void Start()
		{
			FindPlayer();
		}

		private void Update()
		{
			CleanupDeadMinions();
		}

		/// <summary>
		/// Find player by tag
		/// </summary>
		private void FindPlayer()
		{
			GameObject player = GameObject.FindGameObjectWithTag(playerTag);
			if (player != null)
			{
				playerTransform = player.transform;
				if (enableDebug) Debug.Log("[SummonerAI] Player found: " + player.name);
			}
		}

		/// <summary>
		/// Start spawning minions
		/// </summary>
		public void StartSpawning()
		{
			spawnRequested = false;
			if (isSpawning)
			{
				if (enableDebug) Debug.Log("[SummonerAI] Already spawning minions");
				return;
			}

			if (minionPrefab == null)
			{
				Debug.LogError("[SummonerAI] No minion prefab assigned!");
				return;
			}

			if (requireZeroMinionsToSummon && HasActiveMinions)
			{
				if (enableDebug) Debug.Log("[SummonerAI] Minions alive - summon blocked");
				return;
			}

			spawnCoroutine = StartCoroutine(SpawnMinionsCoroutine());
		}

		/// <summary>
		/// Request spawning to begin on an animation event.
		/// </summary>
		public void RequestSpawn()
		{
			spawnRequested = true;
		}

		/// <summary>
		/// Cancel a pending spawn request (e.g., on state exit).
		/// </summary>
		public void CancelSpawnRequest()
		{
			spawnRequested = false;
		}

		/// <summary>
		/// Animation event hook. Call from the summon animation.
		/// </summary>
		public void OnSummonAnimationEvent()
		{
			if (!spawnRequested)
			{
				return;
			}

			StartSpawning();
		}

		/// <summary>
		/// Stop spawning minions immediately
		/// </summary>
		public void StopSpawning()
		{
			if (spawnCoroutine != null)
			{
				StopCoroutine(spawnCoroutine);
				spawnCoroutine = null;
			}
			isSpawning = false;
		}

		/// <summary>
		/// Coroutine that spawns minions with delays
		/// </summary>
		private IEnumerator SpawnMinionsCoroutine()
		{
			isSpawning = true;

			if (enableDebug) Debug.Log($"[SummonerAI] Starting to spawn {minionsPerSummon} minions");

			// Initial delay
			yield return new WaitForSeconds(initialSpawnDelay);

			// Play summon sound
			if (audioSource != null && summonSound != null)
			{
				audioSource.PlayOneShot(summonSound);
			}

			// Spawn minions
			int spawned = 0;
			for (int i = 0; i < minionsPerSummon && activeMinions.Count < maxActiveMinions; i++)
			{
				SpawnSingleMinion();
				spawned++;

				// Wait between spawns (except after last one)
				if (i < minionsPerSummon - 1)
				{
					yield return new WaitForSeconds(timeBetweenSpawns);
				}
			}

			if (enableDebug) Debug.Log($"[SummonerAI] Finished spawning {spawned} minions. Total active: {activeMinions.Count}");

			isSpawning = false;
		}

		/// <summary>
		/// Spawn a single minion at random position around summoner
		/// </summary>
		private void SpawnSingleMinion()
		{
			// Calculate random spawn position
			float angle = Random.Range(0f, 360f) * Mathf.Deg2Rad;
			float x = transform.position.x + spawnRadius * Mathf.Cos(angle);
			float z = transform.position.z + spawnRadius * Mathf.Sin(angle);
			Vector3 spawnPosition = new Vector3(x, transform.position.y + spawnHeightOffset, z);

			// Spawn minion
			GameObject minion = Instantiate(minionPrefab, spawnPosition, Quaternion.identity);

			// Set rotation
			if (minionsLookAtCenter)
			{
				minion.transform.LookAt(transform.position);
			}
			else if (playerTransform != null)
			{
				// Make minion face player
				Vector3 directionToPlayer = (playerTransform.position - minion.transform.position).normalized;
				directionToPlayer.y = 0;
				if (directionToPlayer != Vector3.zero)
				{
					minion.transform.rotation = Quaternion.LookRotation(directionToPlayer);
				}
			}

			// Configure minion AI to target player
			var minionAI = minion.GetComponent<vControlAI>();
			if (minionAI != null && playerTransform != null)
			{
				// Set player as target through AI system
				minionAI.SetCurrentTarget(playerTransform);
			}

			// Add to active minions list
			activeMinions.Add(minion);

			// Spawn visual effect
			if (spawnEffectPrefab != null)
			{
				GameObject effect = Instantiate(spawnEffectPrefab, spawnPosition, Quaternion.identity);
				Destroy(effect, 3f);
			}

			if (enableDebug) Debug.Log($"[SummonerAI] Spawned minion at {spawnPosition}");
		}

		/// <summary>
		/// Remove destroyed/null minions from list
		/// </summary>
		private void CleanupDeadMinions()
		{
			activeMinions.RemoveAll(minion => minion == null);
		}

		/// <summary>
		/// Check if summoner should spawn minions based on health
		/// </summary>
		public bool ShouldSummonByHealth()
		{
			if (healthController == null) return false;

			float healthPercent = healthController.currentHealth / healthController.MaxHealth;
			return healthPercent <= healthThresholdForSummon;
		}

		/// <summary>
		/// Get distance to player
		/// </summary>
		public float GetDistanceToPlayer()
		{
			if (playerTransform == null)
			{
				FindPlayer();
				if (playerTransform == null) return float.MaxValue;
			}

			return Vector3.Distance(transform.position, playerTransform.position);
		}

		/// <summary>
		/// Check if player is in melee range
		/// </summary>
		public bool IsPlayerInMeleeRange()
		{
			return GetDistanceToPlayer() <= meleeEngageDistance;
		}

		/// <summary>
		/// Check if player is within the desired safe distance
		/// </summary>
		public bool IsPlayerTooCloseForSafeDistance()
		{
			return GetDistanceToPlayer() < safeDistance;
		}

		/// <summary>
		/// Check if summoner has reached/maintains safe distance
		/// </summary>
		public bool IsAtSafeDistance()
		{
			return GetDistanceToPlayer() >= safeDistance;
		}

		/// <summary>
		/// Should summoner try to flee to reach safe distance
		/// </summary>
		public bool ShouldFleeToSafeDistance()
		{
			float distance = GetDistanceToPlayer();
			if (distance <= meleeEngageDistance) return false;
			if (CanSpawnMinions || CanCastSpell()) return false;
			return distance < safeDistance;
		}

		/// <summary>
		/// Check if summoner should engage in melee combat
		/// </summary>
		public bool ShouldEngageMelee()
		{
			if (!IsPlayerInMeleeRange()) return false;
			if (!CanMeleeNow()) return false;
			return !CanSpawnMinions && !CanCastSpell();
		}

		public bool CanMeleeNow()
		{
			return Time.time >= nextMeleeTime;
		}

		public void NotifyMeleeAttack()
		{
			float min = Mathf.Min(meleeCooldownMin, meleeCooldownMax);
			float max = Mathf.Max(meleeCooldownMin, meleeCooldownMax);
			if (max <= 0f)
			{
				nextMeleeTime = 0f;
				return;
			}
			nextMeleeTime = Time.time + Random.Range(min, max);
		}

		/// <summary>
		/// Check if summoner can cast a ranged spell now
		/// </summary>
		public bool CanCastSpell()
		{
			if (isSpawning) return false;
			if (fireballPrefab == null) return false;
			if (spellRequiresMinionsAlive && !HasActiveMinions) return false;

			float distance = GetDistanceToPlayer();
			if (distance < spellMinDistance) return false;
			if (spellMaxDistance > 0f && distance > spellMaxDistance) return false;

			return (Time.time - lastSpellTime) >= spellCooldown;
		}

		/// <summary>
		/// Notify that a spell was cast (updates cooldown timer)
		/// </summary>
		public void NotifySpellCast()
		{
			lastSpellTime = Time.time;
		}

		/// <summary>
		/// Spawn a fireball from pivot towards player
		/// </summary>
		public void CastFireball()
		{
			if (!CanCastSpell()) return;

			Transform pivot = spellSpawnPivot != null ? spellSpawnPivot : transform;
			Vector3 targetPos = playerTransform != null ? playerTransform.position + Vector3.up * 1f : (pivot.position + pivot.forward);
			Vector3 dir = (targetPos - pivot.position).normalized;
			if (dir == Vector3.zero) dir = pivot.forward;

			Quaternion rot = Quaternion.LookRotation(dir);
			LeanPool.Spawn(fireballPrefab, pivot.position, rot);

			NotifySpellCast();

			if (enableDebug) Debug.Log("[SummonerAI] Cast fireball");
		}

		/// <summary>
		/// Destroy all active minions (e.g., when summoner dies)
		/// </summary>
		public void DestroyAllMinions()
		{
			foreach (GameObject minion in activeMinions)
			{
				if (minion != null)
				{
					Destroy(minion);
				}
			}
			activeMinions.Clear();

			if (enableDebug) Debug.Log("[SummonerAI] All minions destroyed");
		}

		private void OnDestroy()
		{
			// Cleanup minions when summoner dies
			DestroyAllMinions();
		}

		private void OnDrawGizmosSelected()
		{
			if (!showGizmos) return;

			// Draw spawn radius
			Gizmos.color = Color.cyan;
			DrawCircle(transform.position, spawnRadius, 32);

			// Draw melee range
			Gizmos.color = Color.red;
			DrawCircle(transform.position, meleeEngageDistance, 16);

			// Draw safe distance
			Gizmos.color = Color.yellow;
			DrawCircle(transform.position, safeDistance, 24);

			// Draw lines to active minions
			Gizmos.color = Color.green;
			foreach (GameObject minion in activeMinions)
			{
				if (minion != null)
				{
					Gizmos.DrawLine(transform.position + Vector3.up, minion.transform.position + Vector3.up);
				}
			}
		}

		private void DrawCircle(Vector3 center, float radius, int segments)
		{
			float angleStep = 360f / segments;
			Vector3 previousPoint = center + new Vector3(radius, 0, 0);

			for (int i = 1; i <= segments; i++)
			{
				float angle = i * angleStep * Mathf.Deg2Rad;
				Vector3 newPoint = center + new Vector3(
					Mathf.Cos(angle) * radius,
					0,
					Mathf.Sin(angle) * radius
				);
				Gizmos.DrawLine(previousPoint, newPoint);
				previousPoint = newPoint;
			}
		}
	}
}