using BehaviorDesigner.Runtime;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.Animations;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public abstract class CombatAi : HumanAi
    {
        #region Properties and variables
        
        // 일반 변수
        [SerializeField] protected bool isDrawGizmosInFieldOfView = true;
        [SerializeField] protected bool isAttacking;
        [SerializeField] protected LayerMask targetLayer;
        [SerializeField] protected Vector3 defensePos;

        [SerializeField] protected Transform targetTransform;
        [SerializeField] protected Collider[] colliderWithinRange = new Collider[TARGET_MAX_SIZE];
        [SerializeField] protected IslandInfo attackingIslandInfo;
        [SerializeField] protected IslandInfo defendingIslandInfo;
        
        // 컴포넌트 관련 변수
        protected Animator combatAnimator;
        protected NavMeshAgent combatAgent;
        protected CapsuleCollider myCollider;
        protected CapsuleCollider hitBoxCollider;
        protected LookAtConstraint lookAtConstraint;
        protected BehaviorTree behaviorTree;
        
        // 애니메이션 관련 변수
        protected static readonly int SpeedHash = Animator.StringToHash("Speed");
        protected static readonly int AttackHash = Animator.StringToHash("Attack");
        protected static readonly int DamageHash = Animator.StringToHash("TakeDamage");
        protected static readonly int DeathTypeHash = Animator.StringToHash("DeathType");
        protected static readonly int DeathHash = Animator.StringToHash("Death");
        protected static readonly int ShieldHash = Animator.StringToHash("Shield");
        protected static readonly int OutlineColorHash = Shader.PropertyToID("_OutlineColor");

        protected const int TARGET_MAX_SIZE = 30; 
        
        #endregion

        #region Abstract methods

        protected abstract void SetLayer();
        protected abstract void SetCurrentHp(float value, bool useBehaviorTreeVariable = false);
        protected abstract void RemoveAiListElement();
        public abstract void FindTarget();
        public abstract bool CanAttack();
        public abstract void Attack();

        #endregion

        #region Unity built-in methods

        protected override void Awake()
        {
            base.Awake();
            
            FlagLookAtCamera();
            SetLayer();
        }

        private void Update()
        {
            if (combatAnimator.runtimeAnimatorController != null && combatAnimator.isActiveAndEnabled)
            {
                combatAnimator.SetFloat(SpeedHash, combatAgent.velocity.magnitude);
            }
            UpdateLookAtTarget();
        }

        #endregion

        #region Custom methods

        protected override void InitComponent()
        {
            base.InitComponent();
            
            combatAnimator = Utils.GetComponentAndAssert<Animator>(transform);
            combatAgent = Utils.GetComponentAndAssert<NavMeshAgent>(transform);
            myCollider = Utils.GetComponentAndAssert<CapsuleCollider>(transform);
            hitBoxCollider = Utils.GetComponentAndAssert<CapsuleCollider>(transform.Find("HitBox"));
            lookAtConstraint = Utils.GetComponentAndAssert<LookAtConstraint>(flagContainer);
        }

        protected void FlagLookAtCamera()
        {
            if (CameraManager.Inst.MainCam != null)
            {
                var source = new ConstraintSource
                {
                    sourceTransform = CameraManager.Inst.MainCam.transform,
                    weight = 1f
                };
                lookAtConstraint.AddSource(source);
            }

            lookAtConstraint.constraintActive = true;
        }
        
        protected void SetBehaviorTree(ExternalBehaviorTree externalBehaviorTree)
        {
            if (!externalBehaviorTree)
            {
                print("externalBehaviorTree == null error");
            }

            var bt = gameObject.GetComponent<BehaviorTree>();
            if (bt != null)
            {
                Destroy(bt);
            }
            
            behaviorTree = gameObject.AddComponent<BehaviorTree>();
            behaviorTree.StartWhenEnabled = false;
            behaviorTree.ExternalBehavior = externalBehaviorTree;
            
            behaviorTree.EnableBehavior();
        }

        public void MoveTarget(Vector3 targetPos, float stopDistance)
        {
            if (Vector3.Distance(combatAgent.destination, targetPos) < 0.1f) return;
            
            combatAgent.stoppingDistance = stopDistance;
            combatAgent.SetDestination(targetPos);
        }
        
        private void UpdateLookAtTarget()
        {
            if (CanAttack())
            {
                combatAgent.updateRotation = false;
                
                var targetPos = targetTransform.position;
                targetPos.y = transform.position.y;
                transform.LookAt(targetPos);
            }
            else
            {
                combatAgent.updateRotation = true;
            }
        }
        
        public void SetTargetTransform(Transform value, bool useBehaviorTreeVariable = false)
        {
            targetTransform = value;
            
            if (!useBehaviorTreeVariable) return;
            
            Utils.SetBehaviorVariable(behaviorTree, "TargetTransform", value);
        }

        public void Die()
        {
            RemoveIslandInfo();
            RemoveAiListElement();

            StopAllCoroutines();
            combatAgent.enabled = false;
            myCollider.enabled = false;
            hitBoxCollider.enabled = false;

            var randomValue = Random.Range(0, 2);
            combatAnimator.SetInteger(DeathTypeHash, randomValue);
                
            // TODO : 죽었을 때 처리(죽는 애니메이션 이후 사라지는 효과 등)
            combatAnimator.SetTrigger(DeathHash);
        }
        
        private void RemoveIslandInfo()
        {
            if (defendingIslandInfo == null) return;
            
            defendingIslandInfo.RemoveListElement(defendingIslandInfo.EnemyList, transform);
            defendingIslandInfo.RemoveListElement(defendingIslandInfo.ExceptHouseList, transform);
            defendingIslandInfo.RemoveListElement(defendingIslandInfo.TargetAllList, transform);
        }

        protected void SetAnimatorController(string controllerName) => combatAnimator.runtimeAnimatorController =
            UnitManager.Inst.AIAnimatorControllerList.Find(obj => obj.name == controllerName);
        protected void SetMoveSpeed(float value) => combatAgent.speed = value;
        public void SetAttackingIslandInfo(IslandInfo info) => attackingIslandInfo = info;
        public void SetDefendingIslandInfo(IslandInfo info) => defendingIslandInfo = info;
        public Transform GetTargetTransform() => targetTransform;
        public Vector3 GetDefensePos() => defensePos;
        public NavMeshAgent GetCombatAgent() => combatAgent;

        #endregion
    }
}