using Invector;
using Invector.vCharacterController;
using Lean.Pool;
using UnityEngine;

namespace DemonBoss.Magic
{
	/// <summary>
	/// Component handling damage and collisions for fireball fired by crystals
	/// Deals damage on collision with player and automatically despawns
	/// </summary>
	[RequireComponent(typeof(Collider))]
	public class FireballDamage : MonoBehaviour
	{
		[Header("Damage Configuration")]
		[Tooltip("Damage dealt by fireball")]
		public float damage = 25f;

		[Tooltip("Whether fireball can deal damage only once")]
		public bool damageOnce = true;

		[Tooltip("Layer mask for targets that can be hit")]
		public LayerMask targetLayerMask = -1;

		[Header("Impact Effects")]
		[Tooltip("Explosion effect prefab on hit")]
		public GameObject impactEffectPrefab;

		[Tooltip("Impact sound")]
		public AudioClip impactSound;

		[Tooltip("Knockback force on hit")]
		public float knockbackForce = 5f;

		[Header("Lifetime")]
		[Tooltip("Maximum fireball lifetime in seconds (failsafe)")]
		public float maxLifetime = 5f;

		[Tooltip("Whether to destroy fireball on terrain collision")]
		public bool destroyOnTerrain = true;

		[Tooltip("Layer mask for terrain/obstacles")]
		public LayerMask terrainLayerMask = 1;

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

		// Private variables
		private bool hasDealtDamage = false;

		private float spawnTime;
		private AudioSource audioSource;
		private Collider fireballCollider;
		private Rigidbody fireballRigidbody;

		/// <summary>
		/// Component initialization
		/// </summary>
		private void Awake()
		{
			fireballCollider = GetComponent<Collider>();
			fireballRigidbody = GetComponent<Rigidbody>();

			if (fireballCollider != null && !fireballCollider.isTrigger)
			{
				fireballCollider.isTrigger = true;
				if (enableDebug) Debug.Log("[FireballDamage] Set collider as trigger");
			}

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

		/// <summary>
		/// Start - note spawn time and start failsafe timer
		/// </summary>
		private void Start()
		{
			spawnTime = Time.time;
			hasDealtDamage = false;

			Invoke(nameof(FailsafeDespawn), maxLifetime);

			if (enableDebug) Debug.Log("[FireballDamage] Fireball initialized");
		}

		/// <summary>
		/// Trigger collision handling - dealing damage
		/// </summary>
		/// <param name="other">Collider that fireball collides with</param>
		private void OnTriggerEnter(Collider other)
		{
			if (enableDebug) Debug.Log($"[FireballDamage] Collision with: {other.name}");

			if (IsValidTarget(other))
			{
				DealDamageToTarget(other);
				CreateImpactEffect(other.transform.position);
				DespawnFireball();
				return;
			}

			if (destroyOnTerrain && IsTerrainCollision(other))
			{
				if (enableDebug) Debug.Log("[FireballDamage] Terrain collision");
				CreateImpactEffect(transform.position);
				DespawnFireball();
				return;
			}
		}

		/// <summary>
		/// Checks if collider is valid target
		/// </summary>
		/// <param name="other">Collider to check</param>
		/// <returns>True if it's valid target</returns>
		private bool IsValidTarget(Collider other)
		{
			if ((targetLayerMask.value & (1 << other.gameObject.layer)) == 0)
				return false;

			if (damageOnce && hasDealtDamage)
				return false;

			var damageReceiver = other.GetComponent<vIDamageReceiver>();
			var healthController = other.GetComponent<vHealthController>();
			var character = other.GetComponent<vCharacter>();
			var thirdPersonController = other.GetComponent<vThirdPersonController>();

			if (damageReceiver == null) damageReceiver = other.GetComponentInParent<vIDamageReceiver>();
			if (healthController == null) healthController = other.GetComponentInParent<vHealthController>();
			if (character == null) character = other.GetComponentInParent<vCharacter>();
			if (thirdPersonController == null) thirdPersonController = other.GetComponentInParent<vThirdPersonController>();

			return damageReceiver != null || healthController != null || character != null || thirdPersonController != null;
		}

		/// <summary>
		/// Checks if it's terrain collision
		/// </summary>
		/// <param name="other">Collider to check</param>
		/// <returns>True if it's terrain</returns>
		private bool IsTerrainCollision(Collider other)
		{
			return (terrainLayerMask.value & (1 << other.gameObject.layer)) != 0;
		}

		/// <summary>
		/// Deals damage to target - ulepszona wersja
		/// </summary>
		/// <param name="targetCollider">Target collider</param>
		private void DealDamageToTarget(Collider targetCollider)
		{
			if (enableDebug) Debug.Log($"[FireballDamage] Dealing {damage} damage to: {targetCollider.name}");

			Vector3 hitPoint = GetClosestPointOnCollider(targetCollider);
			Vector3 hitDirection = GetHitDirection(targetCollider);

			vDamage damageInfo = new vDamage(Mathf.RoundToInt(damage));
			damageInfo.sender = transform;
			damageInfo.hitPosition = hitPoint;

			if (knockbackForce > 0f)
			{
				damageInfo.force = hitDirection * knockbackForce;
			}

			bool damageDealt = false;

			var damageReceiver = targetCollider.GetComponent<vIDamageReceiver>();
			if (damageReceiver == null) damageReceiver = targetCollider.GetComponentInParent<vIDamageReceiver>();

			if (damageReceiver != null && !damageDealt)
			{
				damageReceiver.TakeDamage(damageInfo);
				damageDealt = true;
				hasDealtDamage = true;
				if (enableDebug) Debug.Log("[FireballDamage] Damage dealt through vIDamageReceiver");
			}

			if (!damageDealt)
			{
				var healthController = targetCollider.GetComponent<vHealthController>();
				if (healthController == null) healthController = targetCollider.GetComponentInParent<vHealthController>();

				if (healthController != null)
				{
					healthController.TakeDamage(damageInfo);
					damageDealt = true;
					hasDealtDamage = true;
					if (enableDebug) Debug.Log("[FireballDamage] Damage dealt through vHealthController");
				}
			}

			if (!damageDealt)
			{
				var thirdPersonController = targetCollider.GetComponent<vThirdPersonController>();
				if (thirdPersonController == null) thirdPersonController = targetCollider.GetComponentInParent<vThirdPersonController>();

				if (thirdPersonController != null)
				{
					if (thirdPersonController is Beyond.bThirdPersonController beyondController)
					{
						if (!beyondController.GodMode && !beyondController.isImmortal)
						{
							thirdPersonController.TakeDamage(damageInfo);
							damageDealt = true;
							hasDealtDamage = true;
							if (enableDebug) Debug.Log("[FireballDamage] Damage dealt through bThirdPersonController");
						}
						else
						{
							if (enableDebug) Debug.Log("[FireballDamage] Player is immortal or in God Mode - no damage dealt");
						}
					}
					else
					{
						thirdPersonController.TakeDamage(damageInfo);
						damageDealt = true;
						hasDealtDamage = true;
						if (enableDebug) Debug.Log("[FireballDamage] Damage dealt through vThirdPersonController");
					}
				}
			}

			if (!damageDealt)
			{
				if (enableDebug) Debug.LogWarning("[FireballDamage] Could not deal damage - no valid damage receiver found!");
			}
		}

		/// <summary>
		/// Takes the closest point on the collider as the point of impact
		/// </summary>
		private Vector3 GetClosestPointOnCollider(Collider targetCollider)
		{
			return targetCollider.ClosestPoint(transform.position);
		}

		/// <summary>
		/// Calculates the direction of impact for knockback
		/// </summary>
		private Vector3 GetHitDirection(Collider targetCollider)
		{
			Vector3 direction;

			if (fireballRigidbody != null && fireballRigidbody.linearVelocity.magnitude > 0.1f)
			{
				direction = fireballRigidbody.linearVelocity.normalized;
			}
			else
			{
				direction = (targetCollider.transform.position - transform.position).normalized;
			}

			direction.y = Mathf.Max(0.2f, direction.y);
			return direction.normalized;
		}

		/// <summary>
		/// Creates impact effect
		/// </summary>
		/// <param name="impactPosition">Impact position</param>
		private void CreateImpactEffect(Vector3 impactPosition)
		{
			if (impactEffectPrefab != null)
			{
				GameObject impact = LeanPool.Spawn(impactEffectPrefab, impactPosition, Quaternion.identity);

				LeanPool.Despawn(impact, 3f);

				if (enableDebug) Debug.Log("[FireballDamage] Impact effect created");
			}

			if (audioSource != null && impactSound != null)
			{
				audioSource.PlayOneShot(impactSound);
			}
		}

		/// <summary>
		/// Despawns fireball from map
		/// </summary>
		private void DespawnFireball()
		{
			if (enableDebug) Debug.Log("[FireballDamage] Despawning fireball");

			CancelInvoke(nameof(FailsafeDespawn));

			LeanPool.Despawn(gameObject);
		}

		/// <summary>
		/// Failsafe despawn - removes fireball after maximum lifetime
		/// </summary>
		private void FailsafeDespawn()
		{
			if (enableDebug) Debug.Log("[FireballDamage] Failsafe despawn - lifetime exceeded");
			DespawnFireball();
		}

		/// <summary>
		/// Forces immediate despawn
		/// </summary>
		public void ForceDespawn()
		{
			if (enableDebug) Debug.Log("[FireballDamage] Forced despawn");
			DespawnFireball();
		}

		/// <summary>
		/// Checks if fireball has already dealt damage
		/// </summary>
		/// <returns>True if damage was already dealt</returns>
		public bool HasDealtDamage()
		{
			return hasDealtDamage;
		}

		/// <summary>
		/// Returns fireball lifetime
		/// </summary>
		/// <returns>Time in seconds since spawn</returns>
		public float GetLifetime()
		{
			return Time.time - spawnTime;
		}

		/// <summary>
		/// Sets new damage (e.g. for different difficulty levels)
		/// </summary>
		/// <param name="newDamage">New damage</param>
		public void SetDamage(float newDamage)
		{
			damage = newDamage;
			if (enableDebug) Debug.Log($"[FireballDamage] Set new damage: {damage}");
		}

		/// <summary>
		/// Sets new knockback
		/// </summary>
		/// <param name="newKnockback">New knockback force</param>
		public void SetKnockback(float newKnockback)
		{
			knockbackForce = newKnockback;
			if (enableDebug) Debug.Log($"[FireballDamage] Set new knockback: {knockbackForce}");
		}

		/// <summary>
		/// Resets fireball state (useful for pooling)
		/// </summary>
		public void ResetFireball()
		{
			hasDealtDamage = false;
			spawnTime = Time.time;

			CancelInvoke();

			Invoke(nameof(FailsafeDespawn), maxLifetime);

			if (enableDebug) Debug.Log("[FireballDamage] Fireball reset");
		}

		/// <summary>
		/// Called on spawn by Lean Pool
		/// </summary>
		private void OnSpawn()
		{
			ResetFireball();
		}

		/// <summary>
		/// Called on despawn by Lean Pool
		/// </summary>
		private void OnDespawn()
		{
			CancelInvoke();
		}
	}
}