using System;
using System.Collections;
using BehaviorDesigner.Runtime;
using Pathfinding;
using RayFire;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.Serialization;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class PirateShipAi : MonoBehaviour, IDamageable
    {
        /***********************************************************************
         *                               Variables
         ***********************************************************************/
        #region Variables

        // 컴포넌트
        [TitleGroup("컴포넌트"), BoxGroup("컴포넌트/컴포넌트", ShowLabel = false)]
        [Required, SerializeField] private Patrol patrol;
        
        [BoxGroup("컴포넌트/컴포넌트", ShowLabel = false)]
        [Required, SerializeField] private Cannon cannon;
        
        [BoxGroup("컴포넌트/컴포넌트", ShowLabel = false)]
        [SerializeField] private RayfireRigid[] rayfireRigids;
        
        // 배의 기본 설정
        [field: TitleGroup("배의 기본 설정")]
        
        // AI
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟 감지 거리"), Range(0f, 200f)]
        [SerializeField] private float viewRadius = 100f;
        
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟의 정면 방향으로 Offset만큼의 위치를 목표 지점으로 설정"), Range(0f, 100f)]
        [SerializeField] private float targetForwardOffset = 50f;
        
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟과 유지할 거리"), Range(0f, 100f)]
        [SerializeField] private float targetMaintainDistance = 40f;
        
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟을 놓치기 시작한 거리"), Range(0f, 200f)]
        [SerializeField] private float missDistance = 100f;
        
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟을 놓치기 시작한 거리"), Range(0f, 20f)]
        [SerializeField] private float missedTargetTime = 5f;
        
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟을 완전히 놓친 후, 기다리는 시간"), Range(0f, 10f)]
        [SerializeField] private float returnPatrolWaitTime = 3f;
        
        [BoxGroup("배의 기본 설정/AI")]
        [Tooltip("타겟과 유지할 거리"), Range(0f, 100f)]
        [SerializeField] private float cannonLaunchDistance = 60f;
        
        // 체력
        [field: BoxGroup("배의 기본 설정/체력")]
        [field: Tooltip("배의 최대 체력"), Range(1f, 1000f)]
        [field: SerializeField] public float MaxHp { get; private set; } = 100f;
        
        [field: BoxGroup("배의 기본 설정/체력")]
        [field: Tooltip("배의 현재 체력")]
        [field: SerializeField] public float CurrentHp { get; private set; }
        
        // 기타
        [BoxGroup("배의 기본 설정/기타")]
        [SerializeField] private bool isDrawingGizmos = true;
        
        [BoxGroup("배의 기본 설정/기타")]
        [SerializeField] private LayerMask targetLayer;
        
        [field: SerializeField] public Collider Target { get; private set; }

        private IAstarAI ai;
        private Collider[] hitColliders;
        private WaitForSeconds rescanTime = new(1f);
        private Coroutine findNearestTargetCoroutine;
        private Coroutine patrolCoroutine;
        private Coroutine chaseCoroutine;
        private Coroutine missedTargetCoroutine;

        private const int MAX_HIT_SIZE = 5;

        #endregion

        /***********************************************************************
         *                               Unity Events
         ***********************************************************************/
        #region Unity Events

        private void OnDrawGizmosSelected()
        {
            if (!isDrawingGizmos) return;

            var centerPosition = transform.position;
            
            Gizmos.color = Color.red;
            Gizmos.DrawWireSphere(centerPosition, viewRadius);
        }

        private void Start()
        {
            InitStart();
        }

        private void Update()
        {
            RotateCannon();
        }

        #endregion
        
        /***********************************************************************
         *                              Init Methods
         ***********************************************************************/
        #region Init Methods
        
        [Button("셋팅 초기화")]
        private void Init()
        {
            patrol = GetComponent<Patrol>();
            cannon = transform.Find("Cannon")?.GetComponent<Cannon>();
        }

        private void InitStart()
        {
            ai = GetComponent<IAstarAI>();
            hitColliders = new Collider[MAX_HIT_SIZE];
            SetCurrentHp(MaxHp);
            
            findNearestTargetCoroutine = StartCoroutine(nameof(FindNearestTargetCoroutine));

            if (!Target)
            {
                patrolCoroutine = StartCoroutine(nameof(PatrolCoroutine));
            }
        }

        #endregion
        
        /***********************************************************************
         *                              Interfaces
         ***********************************************************************/
        #region Interfaces

        public void TakeDamage(float attackerPower, Vector3? attackPos = null)
        {
            var changeHp = Mathf.Max(CurrentHp - attackerPower, 0f);
            
            SetCurrentHp(changeHp);

            if (CurrentHp == 0f)
            {
                Die();
            }
        }

        public void Die()
        {
            if (ai != null)
            {
                ai.isStopped = true;
            }
            
            foreach (var element in rayfireRigids)
            {
                if (element)
                {
                    element.Demolish();
                }
            }
        }

        public float GetCurrentHp() => CurrentHp;

        #endregion
        
        /***********************************************************************
         *                              Methods
         ***********************************************************************/
        #region Methods
        
        private IEnumerator FindNearestTargetCoroutine()
        {
            while (true)
            {
                var centerPos = transform.position;
                var hitSize = Physics.OverlapSphereNonAlloc(centerPos, viewRadius, hitColliders, targetLayer, QueryTriggerInteraction.Ignore);

                if (hitSize <= 0)
                {
                    Target = null;
                    yield return rescanTime;
                    continue;
                }

                var nearestDistance = float.PositiveInfinity;
                Collider nearestTargetCollider = null;
                for (var i = 0; i < hitSize; i++)
                {
                    var distance = Vector3.Distance(centerPos, hitColliders[i].transform.position);

                    if (distance >= nearestDistance) continue;

                    nearestDistance = distance;
                    nearestTargetCollider = hitColliders[i];
                }

                Target = nearestTargetCollider;
                if (Target != null)
                {
                    if (patrolCoroutine != null)
                    {
                        StopCoroutine(patrolCoroutine);
                        patrolCoroutine = null;
                    }
                    
                    chaseCoroutine ??= StartCoroutine(nameof(ChaseCoroutine));
                    findNearestTargetCoroutine = null;
                    yield break;
                }
                
                yield return rescanTime;
            }
        }

        private IEnumerator PatrolCoroutine()
        {
            if (patrol.WayPoints.Length <= 0) yield break;
            
            var movePoint = patrol.GetCurrentWayPoint();
            SetDestination(movePoint);
            
            while (ai.pathPending)
            {
                yield return null;
            }
            
            while (!ai.reachedDestination)
            {
                SetDestination(movePoint);
                yield return null;
            }
            
            var elapsedTime = 0f;
            var currentWaitTime = patrol.GetCurrentWayPointInfo().WaitTime;

            while (elapsedTime < currentWaitTime)
            {
                elapsedTime += Time.deltaTime;
                yield return null;
            }

            patrol.SetMovePoint();
            patrolCoroutine = StartCoroutine(nameof(PatrolCoroutine));
        }

        private IEnumerator ChaseCoroutine()
        {
            while (Target)
            {
                var targetTransform = Target.transform;
                var toTarget = targetTransform.position - transform.position;
                toTarget.y = 0f;
                var targetDistance = toTarget.magnitude;
                var targetDirection = toTarget.normalized;
                if (targetDistance > missDistance)
                {
                    missedTargetCoroutine ??= StartCoroutine(nameof(MissedTargetCoroutine));
                }

                var movePosition = targetTransform.position + targetTransform.forward * targetForwardOffset;
                if (targetDistance < targetMaintainDistance)
                {
                    var crossDirection = Vector3.Cross(targetDirection, Vector3.up).normalized;
                    movePosition = targetTransform.position + crossDirection * targetMaintainDistance;
                }

                if (targetDistance < cannonLaunchDistance && !cannon.IsReloading)
                {
                    cannon.LaunchAtTarget(Target);
                }
                
                SetDestination(movePosition);

                yield return null;
            }
            
            chaseCoroutine = null;
        }

        private IEnumerator MissedTargetCoroutine()
        {
            var elapsedTime = 0f;
            while (elapsedTime <= missedTargetTime)
            {
                elapsedTime += Time.deltaTime;
                
                var targetDistance = Vector3.Distance(transform.position, Target.transform.position);
                if (targetDistance <= missDistance)
                {
                    missedTargetCoroutine = null;
                    yield break;
                }

                yield return null;
            }

            Target = null;
            ai.isStopped = true;
            yield return new WaitForSeconds(returnPatrolWaitTime);
            
            missedTargetCoroutine = null;
            findNearestTargetCoroutine ??= StartCoroutine(nameof(FindNearestTargetCoroutine));
            patrolCoroutine ??= StartCoroutine(nameof(PatrolCoroutine));
        }
        
        private void SetDestination(Vector3 position)
        {
            if (ai == null) return;
            
            if (ai.isStopped)
            {
                ai.isStopped = false;
            }
                
            ai.destination = position;
        }
        
        private void RotateCannon()
        {
            if (!Target) return;

            var directionToMouse = (Target.transform.position - transform.position).normalized;
            directionToMouse.y = 0f;

            var lookRotation = Quaternion.LookRotation(directionToMouse);
            var cannonRotationDirection = Quaternion.Euler(0f, lookRotation.eulerAngles.y, 0f);
                
            cannon.transform.rotation = cannonRotationDirection;
        }
        
        public void HitAction(RaycastHit hit, float power, GameObject marker = null)
        {
            hit.transform.GetComponent<IDamageable>()?.TakeDamage(power);
            
            cannon.SetActivePredictLine(false);
            if (marker)
            {
                Destroy(marker);
            }
        }

        public void SetCurrentHp(float value) => CurrentHp = value;

        #endregion
    }
}