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, IAiMover
    {
        #region Property and variable

        [Title("Skin")]
        [Tooltip("SkinnedMeshRenderer, MeshRenderer의 Material을 모두 담고 있는 리스트")]
        [SerializeField] protected List<Material> skinMaterialList = new(10);
        
        [Tooltip("캐릭터 외곽선의 기본 색상")]
        [SerializeField] protected Color defaultSkinColor = Color.black;
        
        [Tooltip("캐릭터에 마우스 커서가 올라가 있을 때 색상")]
        [SerializeField] protected Color mouseEnterHighlightSkinColor = Color.white;
        
        [Tooltip("캐릭터가 선택되었을 때 색상")]
        [SerializeField] protected Color selectedSkinColor = Color.blue;
        
        [SerializeField] protected bool isAttacking;
        [SerializeField] protected AttackerType attackerType;
        private Vector3 commandedPos;

        protected Animator aiAnimator;
        protected NavMeshAgent navMeshAgent;
        private UnitController myUnitController;
        private UnitController mouseEnterUnitController;
        private UnitSelection unitSelection;
        private CapsuleCollider myCollider;
        private CapsuleCollider hitBoxCollider;

        private static readonly int SpeedHash = Animator.StringToHash("Speed");
        protected static readonly int AttackHash = Animator.StringToHash("Attack");
        private static readonly int DamageHash = Animator.StringToHash("TakeDamage");
        private static readonly int DeathTypeHash = Animator.StringToHash("DeathType");
        private static readonly int DeathHash = Animator.StringToHash("Death");
        private static readonly int ShieldHash = Animator.StringToHash("Shield");
        private 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

#if UNITY_EDITOR
        private void OnDrawGizmosSelected()
        {
            DrawGizmosInFieldOfView();
        }
#endif

        protected virtual void Awake()
        {
            FindMaterial();
            aiAnimator = Utils.GetComponentAndAssert<Animator>(transform);
            navMeshAgent = Utils.GetComponentAndAssert<NavMeshAgent>(transform);
            myUnitController = Utils.GetComponentAndAssert<UnitController>(transform.parent);
            myCollider = Utils.GetComponentAndAssert<CapsuleCollider>(transform);
            hitBoxCollider = Utils.GetComponentAndAssert<CapsuleCollider>(transform.Find("HitBox"));

            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();
            UpdateMovement();
        }
        
        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, Vector3? attackPos = null)
        {
            if (!TargetTransform && attackPos != null)
            {
                BeAttackedMovement((Vector3)attackPos);
            }
            
            // 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)
            {
                aiAnimator.SetTrigger(ShieldHash);
                return;
            }
            var changeHp = Mathf.Max(defender.currentHp - finalDamage, 0);
            SetCurrentHp(changeHp);

            // 죽었는지 체크
            if (changeHp == 0f)
            {
                myCollider.enabled = false;
                hitBoxCollider.enabled = false;
                navMeshAgent.isStopped = true;
                navMeshAgent.velocity = Vector3.zero;

                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), 3f);
                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 Transform TargetTransform { get; set; }
        
        //[field: SerializeField] public TargetInfo TargetInfo { get; set; } = new();

        private const int TARGET_MAX_SIZE = 30;
        
        public void DrawGizmosInFieldOfView()
        {
            if (!IsDrawGizmosInFieldOfView) return;

            var myPos = transform.position;

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

            if (!TargetTransform) return;
            
            Debug.DrawLine(myPos, TargetTransform.position, Color.red);
        }

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

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

                if (maxColliderCount <= 0)
                {
                    TargetTransform = null;
                    yield return FindTargetWaitTime;
                    continue;
                }

                var nearestDistance = Mathf.Infinity;
                Transform nearestTargetTransform = null;

                for (var i = 0; i < maxColliderCount; i++)
                {
                    var distanceToTarget = Vector3.Distance(transform.position, ColliderWithinRange[i].transform.position);

                    if (distanceToTarget >= nearestDistance) continue;
                    
                    nearestDistance = distanceToTarget;
                    nearestTargetTransform = ColliderWithinRange[i].transform;
                }

                TargetTransform = nearestTargetTransform;

                yield return FindTargetWaitTime;
            }
        }

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

        #endregion

        #region IAiMover

        [field: Space(10f)]
        [field: Title("AiMover")]
        [field: SerializeField] public MoveType AttackMoveType { get; set; }
        
        [field: SerializeField] public MoveType BeAttackedMoveType { get; set; }
        
        [field: SerializeField] public bool IsCommanded { get; set; }

        public void UpdateMovement()
        {
            aiAnimator.SetFloat(SpeedHash, navMeshAgent.velocity.normalized.magnitude);
            
            if (IsCommanded)
            {
                if (navMeshAgent.destination == commandedPos)
                {
                    if (navMeshAgent.remainingDistance <= navMeshAgent.stoppingDistance)
                    {
                        IsCommanded = false;
                    }
                }
                else
                {
                    if (isAttacking) return;
                
                    navMeshAgent.SetDestination(commandedPos);
                }
            }
            else
            {
                if (!TargetTransform) return;

                switch (AttackMoveType)
                {
                    case MoveType.NONE:
                        break;
                    case MoveType.FIXED:
                        break;
                    case MoveType.MOVE:
                        if (Vector3.Distance(transform.position, TargetTransform.position) > AiStat.atkRange)
                        {
                            navMeshAgent.SetDestination(TargetTransform.position);
                        }
                        break;
                    default:
                        throw new ArgumentOutOfRangeException();
                }
            }
        }

        public void BeAttackedMovement(Vector3 attackPos)
        {
            if (TargetTransform) return;
            
            switch (BeAttackedMoveType)
            {
                case MoveType.NONE:
                    break;
                case MoveType.FIXED:
                    break;
                case MoveType.MOVE:
                    if (Vector3.Distance(transform.position, attackPos) > AiStat.atkRange)
                    {
                        myUnitController.MoveCommand(attackPos);
                    }
                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
        
        public void MoveTarget(Vector3 targetPos)
        {
            IsCommanded = true;
            commandedPos = targetPos;
        }

        #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;

                skinMaterialList.Add(skin.material);
            }

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

                skinMaterialList.Add(skin.material);
            }
        }

        private void SetOutlineColor(Color color)
        {
            foreach (var skin in skinMaterialList)
            {
                skin.SetColor(OutlineColorHash, color);
            }
        }
        
        public void ResetHighlight() => SetOutlineColor(defaultSkinColor);
        public void MouseEnterHighlight() => SetOutlineColor(mouseEnterHighlightSkinColor);
        public void SelectedHighlight() => SetOutlineColor(selectedSkinColor);
        private void DestroyObject() => Destroy(gameObject);
        public void OnAttacking(int boolValue) => isAttacking = boolValue == 1;
        public NavMeshAgent GetNavMeshAgent() => navMeshAgent;
        public Animator GetAnimator() => aiAnimator;
        public void SetCurrentHp(float value) => AiStat.currentHp = value;

        #endregion
    }
}