using System;
using System.Collections;
using System.Collections.Generic;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.AI;
using Random = UnityEngine.Random;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public enum AttackerType
    {
        NONE,
        PLAYER,
        PIRATE,
        ENEMY
    }
    
    [Serializable]
    public abstract class AiController : MonoBehaviour, IDamageable, IFieldOfView
    {
        #region Property and variable

        protected bool isAttacking;
        protected AttackerType attackerType;

        [SerializeField] protected List<Material> skinMaterial = new(10);
        protected Animator aiAnimator;
        protected AiMover aiMover;
        protected NavMeshAgent navMeshAgent;
        
        private UnitController mouseEnterUnitController;
        private UnitSelection unitSelection;

        public static readonly int SpeedHash = Animator.StringToHash("Speed");
        public static readonly int AttackHash = Animator.StringToHash("Attack");
        public static readonly int DamageHash = Animator.StringToHash("TakeDamage");
        public static readonly int DeathTypeHash = Animator.StringToHash("DeathType");
        public static readonly int DeathHash = Animator.StringToHash("Death");
        public static readonly int OutlineColorHash = Shader.PropertyToID("_OutlineColor");

        private static readonly WaitForSeconds FindTargetWaitTime = new(0.5f);

        #endregion

        #region abstract function

        protected abstract void Attack();

        #endregion
        
        #region Unity built-in function

        private void OnDrawGizmosSelected()
        {
            DrawGizmosInFieldOfView();
        }

        protected virtual void Awake()
        {
            FindMaterial();
            aiAnimator = Utils.GetComponentAndAssert<Animator>(transform);
            aiMover = Utils.GetComponentAndAssert<AiMover>(transform);
            navMeshAgent = Utils.GetComponentAndAssert<NavMeshAgent>(transform);

            unitSelection = FindObjectOfType<UnitSelection>();

            if (gameObject.layer == LayerMask.NameToLayer("Player"))
            {
                attackerType = AttackerType.PLAYER;
            }
            else if  (gameObject.layer == LayerMask.NameToLayer("Pirate"))
            {
                attackerType = AttackerType.PIRATE;
            }
            else if  (gameObject.layer == LayerMask.NameToLayer("Enemy"))
            {
                attackerType = AttackerType.ENEMY;
            }
        }

        private void Start()
        {
            SetCurrentHp(AiStat.maxHp);
            navMeshAgent.speed = AiStat.moveSpd;

            StartCoroutine(nameof(FindTarget));
            Attack();
        }

        private void FixedUpdate()
        {
            UpdateLookAtTarget();
        }
        
        private void OnMouseEnter()
        {
            mouseEnterUnitController = gameObject.GetComponentInParent<UnitController>();

            if (mouseEnterUnitController == unitSelection.SelectedUnitController) return;

            foreach (var soldier in mouseEnterUnitController.unit.soldierList)
            {
                soldier.MouseEnterHighlight();
            }
        }

        private void OnMouseExit()
        {
            if (!mouseEnterUnitController || mouseEnterUnitController == unitSelection.SelectedUnitController) return;
            
            foreach (var soldier in mouseEnterUnitController.unit.soldierList)
            {
                soldier.ResetHighlight();
            }

            mouseEnterUnitController = null;
        }

        #endregion
        
        #region interface property and function

        #region IAiStat

        [field: Space(10f)]
        [field: Title("AiStat")]
        [field: SerializeField] public AiStat AiStat { get; set; } = new();

        public float GetCurrentHp() => AiStat.currentHp;

        public void TakeDamage(AiStat attacker, AiStat defender)
        {
            // 회피 성공 체크
            if (Random.Range(0, 100) < defender.avoidanceRate)
            {
                // TODO : 회피 처리
                return;
            }
            
            var finalDamage = Utils.CalcDamage(attacker, defender);

            // 방패 막기 체크
            if (finalDamage == 0f)
            {
                // TODO : 방패로 막힘 처리(애니메이션 등)
                return;
            }
            var changeHp = Mathf.Max(defender.currentHp - finalDamage, 0);
            SetCurrentHp(changeHp);

            // 죽었는지 체크
            if (changeHp == 0f)
            {
                var randomValue = Random.Range(0, 2);
                aiAnimator.SetInteger(DeathTypeHash, randomValue);
                
                // TODO : 죽었을 때 처리(죽는 애니메이션 이후 사라지는 효과 등)
                aiAnimator.SetTrigger(DeathHash);
                
                Invoke(nameof(DestroyObject), 5f);
                return;
            }
            
            aiAnimator.SetTrigger(DamageHash);
        }

        #endregion

        #region IFieldOfView
        
        [field: Space(10f)]
        [field: Title("FieldOfView")]
        [field: SerializeField] public bool IsDrawGizmosInFieldOfView { get; set; } = true;

        [field: SerializeField] public LayerMask TargetLayer { get; set; }

        [field: SerializeField] public float ViewRadius { get; set; }

        [field: SerializeField] public Collider[] ColliderWithinRange { get; set; } = new Collider[TARGET_MAX_SIZE];
        
        [field: SerializeField] public List<TargetInfo> TargetInfoList { get; set; } = new(TARGET_MAX_SIZE);
        
        [field: SerializeField] public IAiStat IaiStat { get; set; }
        
        [field: SerializeField] public TargetInfo TargetInfo { get; set; } = new();

        private const int TARGET_MAX_SIZE = 30;

#if UNITY_EDITOR
        public void DrawGizmosInFieldOfView()
        {
            if (!IsDrawGizmosInFieldOfView) return;

            var myPos = transform.position;

            Gizmos.color = Color.green;
            Gizmos.DrawWireSphere(myPos, ViewRadius);

            if (TargetInfo.transform == null) return;
            
            Debug.DrawLine(myPos, TargetInfo.transform.position, Color.red);
        }
#endif

        public IEnumerator FindTarget()
        {
            while (true)
            {
                Array.Clear(ColliderWithinRange, 0, TARGET_MAX_SIZE);
                TargetInfoList.Clear();

                var myPos = transform.position;
                var maxColliderCount = Physics.OverlapSphereNonAlloc(myPos, ViewRadius, ColliderWithinRange, 
                    TargetLayer, QueryTriggerInteraction.Collide);

                if (maxColliderCount <= 0)
                {
                    TargetInfo.DefaultSetting();
                    yield return FindTargetWaitTime;
                    continue;
                }

                for (var i = 0; i < maxColliderCount; i++)
                {
                    IaiStat = ColliderWithinRange[i].GetComponent<IAiStat>();
                    if (IaiStat != null)
                    {
                        TargetInfoList.Add(new TargetInfo(ColliderWithinRange[i].transform, ColliderWithinRange[i], IaiStat));
                    }
                }

                if (TargetInfoList.Count <= 0)
                {
                    TargetInfo.DefaultSetting();
                    yield return FindTargetWaitTime;
                    continue;
                }
                
                int nearestIndex;
                float nearestDistance;

                if (TargetInfoList[0].iAiStat.GetCurrentHp() <= 0)
                {
                    nearestIndex = 0;
                    nearestDistance = float.PositiveInfinity;
                }
                else
                {
                    nearestIndex = 0;
                    nearestDistance = Vector3.Distance(TargetInfoList[0].transform.position, myPos);
                }

                for (var i = 1; i < TargetInfoList.Count; i++)
                {
                    var distance = Vector3.Distance(TargetInfoList[i].transform.position, myPos);

                    if (nearestDistance < distance || TargetInfoList[i].iAiStat.GetCurrentHp() <= 0) continue;

                    nearestIndex = i;
                    nearestDistance = distance;
                }

                if (TargetInfoList[nearestIndex].transform)
                {
                    TargetInfo.SetTargetInfo(TargetInfoList[nearestIndex].transform, TargetInfoList[nearestIndex].collider, TargetInfoList[nearestIndex].iAiStat);
                }
                else
                {
                    TargetInfo.DefaultSetting();
                }
                
                yield return FindTargetWaitTime;
            }
        }

        public void UpdateLookAtTarget()
        {
            if (TargetInfo.transform)
            {
                navMeshAgent.updateRotation = false;
                
                var targetPos = TargetInfo.transform.position;
                targetPos.y = transform.position.y;
                transform.LookAt(targetPos);
            }
            else
            {
                navMeshAgent.updateRotation = true;
            }
        }

        #endregion

        #endregion

        #region Custom function
        private void FindMaterial()
        {
            var skinnedMeshRenderers = GetComponentsInChildren<SkinnedMeshRenderer>();
            var meshRenderers = GetComponentsInChildren<MeshRenderer>();
            
            foreach (var skin in skinnedMeshRenderers)
            {
                if (!skin.gameObject.activeSelf) continue;

                skinMaterial.Add(skin.material);
            }

            foreach (var skin in meshRenderers)
            {
                if (!skin.gameObject.activeSelf) continue;

                skinMaterial.Add(skin.material);
            }
        }

        public void ResetHighlight()
        {
            foreach (var skin in skinMaterial)
            {
                skin.SetColor(OutlineColorHash, Color.black);
            }
        }
        public void MouseEnterHighlight()
        {
            foreach (var skin in skinMaterial)
            {
                skin.SetColor(OutlineColorHash, Color.white);
            }
        }

        public void SelectedHighlight()
        {
            foreach (var skin in skinMaterial)
            {
                skin.SetColor(OutlineColorHash, Color.blue);
            }
        }

        private void DestroyObject() => Destroy(gameObject);
        public bool GetIsAttacking() => isAttacking;
        public NavMeshAgent GetNavMeshAgent() => navMeshAgent;
        public Animator GetAnimator() => aiAnimator;
        public void SetCurrentHp(float value) => AiStat.currentHp = value;

        #endregion
    }
}