using System;
using Game;
using JetBrains.Annotations;
using Meta;
using Stages;
using UnityEngine;
using UnityEngine.AI;
using Utils;

namespace Ai
{
	public class Body : MonoBehaviour
	{
		[SerializeField] private Animator _animator;
		[SerializeField] private float _hitPoints;
		[SerializeField] private HealthBar _bar;
		[SerializeField] private bool _boss;
		[SerializeField] private float _bossResist = 0.6f;
		[SerializeField] private NavMeshAgent _agent;
		[SerializeField] private bool _isImmortal;
		[SerializeField] private bool _isTargetable;
		[SerializeField] private GameObject _headshotFx;
		[SerializeField] private GameObject _deathObject;
		private float _currentHitPoints;
		
		private static readonly int Hp = Animator.StringToHash("hp");
		private static readonly int Hit = Animator.StringToHash("hit");
		private static readonly int Rnd = Animator.StringToHash("rnd");
		private static readonly int Speed = Animator.StringToHash("speed");
		private static readonly int Distance = Animator.StringToHash("Distance");

		public bool IsTargetable
		{
			get { return _isTargetable; }
		}

		public event Action DeathEvent;

		private void OnEnable()
		{
			_currentHitPoints = _hitPoints * PlayerResources.Instance.NPCHitPoints + (_hitPoints * 0.2f * StageProcessor.Instance.World - 1);
			UpdateAnimatorParams();
			if (_animator == null) _animator = GetComponent<Animator>();
		}

		public void SetDamage(float damage, bool showText = true)
		{
			if (_isImmortal)
				return;

			_currentHitPoints -= damage * (_boss ? _bossResist : 1);
			if (showText)
				FlyingText.Init(-(int)damage, FlyingText.State.Normal, transform.position);
            SoundsManager.Instance.PlaySound("damage");
			UpdateAnimatorParams();
			if (_bar != null)
			{
				_bar.SetPercent(_currentHitPoints / (_hitPoints * PlayerResources.Instance.NPCHitPoints + (_hitPoints * 0.2f * StageProcessor.Instance.World - 1)));
			}
			if (_currentHitPoints <= 0)
			{
				if (DeathEvent != null)
					DeathEvent();
				if (_deathObject != null)
				{
					var deathObj = Instantiate(_deathObject);
					deathObj.transform.position = transform.position;
				}

				var position = gameObject.transform.position;
				Destroy(gameObject);
				
				AiController.Instance.EnemyDied(position);
			}
		}

		private void UpdateAnimatorParams()
		{
			if (_animator != null)
			{
				_animator.SetFloat(Hp, _currentHitPoints/ (_hitPoints * PlayerResources.Instance.NPCHitPoints));
				_animator.SetTrigger(Hit);
				_animator.SetFloat(Distance,
					Vector3.Distance(AiController.Instance.PlayerPosition, transform.position));
			}
		}

		void FixedUpdate()
		{
			if (_animator != null)
			{
				_animator.ResetTrigger(Hit);
				_animator.SetFloat(Rnd, UnityEngine.Random.Range(0.0f,1.0f));
				if (_agent != null)
				{
					var speed = _agent.velocity.magnitude / _agent.speed;
					_animator.SetFloat(Speed, speed);
				}
				_animator.SetFloat(Distance,
					Vector3.Distance(AiController.Instance.PlayerPosition, transform.position));
			}
		}

		[UsedImplicitly]
		public void SetImmortal(int i)
		{
			_isImmortal = i > 0;
		}

		[UsedImplicitly]
		public void SetTargetable(int i)
		{
			_isTargetable = i > 0;
		}

		public void InstantDestroy(float damage)
		{
			if (_headshotFx != null)
			{
				var fx = Instantiate(_headshotFx);
				fx.transform.position = transform.position;
			}

			if (!_boss)
			{
				FlyingText.Init(-(int) _currentHitPoints, FlyingText.State.Danger, transform.position);
				SetDamage(_currentHitPoints, false);
			}
		}
	}
}