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using System.Collections.Generic;
using UnityEngine;
using Core;
using MainGame;
 
namespace Target2DSystem
{
    /// <summary>
    /// QuadTree를 사용하여 2D 환경에서 타겟팅 시스템을 관리하는 클래스
    /// 이 클래스는 적 또는 다른 타겟을 QuadTree에 추가 및 제거하며,
    /// 지정된 위치에서 가장 가까운 타겟, 가장 먼 타겟, 또는 우선순위가 가장 높은 타겟을 검색하는 기능을 제공
    /// </summary>
    public class QuadTreeTargetingSystem : Singleton<QuadTreeTargetingSystem>
    {
        private QuadTree quadTree; // QuadTree 객체
        private Rect worldBounds;  // QuadTree가 커버하는 월드 범위
 
        private bool isInitialized = false; // 초기화 여부를 확인하기 위한 플래그
 
        /// <summary>
        /// QuadTreeTargetingSystem을 초기화하는 메서드
        /// 던전 빌더로부터 던전 경계를 가져와 QuadTree를 생성
        /// </summary>
        private void Initialize()
        {
            worldBounds = DungeonBuilder.Instance.GetDungeonBounds(); // 던전 경계를 가져옴
            quadTree = new QuadTree(worldBounds, 4); // QuadTree를 생성, 최대 4개의 객체를 가지는 노드로 설정
            isInitialized = true; // 초기화 완료
        }
 
        /// <summary>
        /// QuadTreeTargetingSystem이 초기화되었는지 확인하고, 초기화되지 않은 경우 초기화를 수행
        /// </summary>
        private void EnsureInitialized()
        {
            if (!isInitialized)
            {
                Initialize();
            }
        }
 
        /// <summary>
        /// 새로운 타겟을 QuadTree에 추가
        /// </summary>
        /// <param name="target">추가할 타겟</param>
        public void AddTarget(ITargetable target)
        {
            EnsureInitialized(); // 초기화 확인
            // 타겟 추가 전 Faction 정보를 출력
            //Faction faction = target.GetFactionDetails().GetFaction();
            //Debug.Log($"[쿼드트리 타겟 추가] 타겟: {target}, Faction: {faction}");
            quadTree.Insert(target); // 타겟 추가
        }
 
        /// <summary>
        /// 타겟을 QuadTree에서 제거
        /// </summary>
        /// <param name="target">제거할 타겟</param>
        public void RemoveTarget(ITargetable target)
        {
            EnsureInitialized(); // 초기화 확인
            quadTree.Remove(target); // 타겟 제거
        }
 
        /// <summary>
        /// 지정된 유닛과 현재 저장할 타겟을 기반으로 가장 가까운 적절한 타겟을 반환합니다.
        /// </summary>
        /// <param name="sender">타겟을 찾는 유닛</param>
        /// <param name="currentTarget">결과로 저장할 타겟</param>
        /// <returns>가장 가까운 타겟, 없으면 null 반환</returns>
        public ITargetable GetClosestTargetWithDifferentFaction(ITargetable sender, ITargetable currentTarget)
        {
            EnsureInitialized(); // 초기화 확인
 
            Vector3 position = sender.GetTargetTransform().position;
            Faction senderFaction = sender.GetFactionDetails().GetFaction(); // Sender의 Faction
 
            List<ITargetable> potentialTargets = quadTree.Retrieve(position); // 잠재적 타겟 검색
            //Debug.Log($"검색된 잠재적 타겟 수: {potentialTargets.Count}");
 
 
            ITargetable closestTarget = null;
            float closestDistance = float.MaxValue;
 
            foreach (ITargetable potentialTarget in potentialTargets)
            {
                Faction targetFaction = potentialTarget.GetFactionDetails().GetFaction(); // 잠재적 타겟의 Faction
                //Debug.Log($"잠재적 타겟: {potentialTarget}, Faction: {potentialTarget.GetFactionDetails().GetFaction()}");
 
                if (targetFaction == senderFaction)
                {
                    //Debug.Log($"[타겟 검색] 타겟이 같은 Faction입니다: {targetFaction}, 건너뜀.");
                    continue; // 같은 Faction의 타겟은 건너뜀
                }
                //Debug.Log($"[타겟 발견] 다른 Faction 발견! 타겟: {potentialTarget}, Faction: {targetFaction}");
 
                float distance = Vector3.Distance(position, potentialTarget.GetTargetTransform().position);
                if (distance < closestDistance)
                {
                    closestDistance = distance;
                    closestTarget = potentialTarget;
                    //Debug.Log($"[타겟 검색] 새로운 가장 가까운 타겟: {closestTarget}, 거리: {closestDistance}");
 
                }
            }
 
            currentTarget = closestTarget; // 가장 가까운 타겟을 currentTarget에 저장
            Debug.Log($"최종 반환할 타겟: {currentTarget}");
            return currentTarget; // 가장 가까운 타겟을 반환
        }
 
 
        /// <summary>
        /// 지정된 위치에서 현재 유닛과 같은 팩션에 속하지 않은 또는 팩션이 없는 가장 가까운 타겟을 반환합니다.
        /// </summary>
        /// <param name="sender">타겟을 찾는 유닛</param>
        /// <param name="currentTarget">결과로 저장할 타겟</param>
        /// <returns>가장 가까운 타겟, 없으면 null 반환</returns>
        public ITargetable GetClosestTargetWithDifferentOrNoFaction(ITargetable sender, ref ITargetable currentTarget)
        {
            EnsureInitialized(); // 초기화 확인
 
            Vector3 position = sender.GetTargetTransform().position;
            Faction currentFaction = sender.GetFactionDetails().GetFaction();
 
            List<ITargetable> potentialTargets = quadTree.Retrieve(position); // 잠재적 타겟 검색
 
            ITargetable closestTarget = currentTarget;
            float closestDistance = currentTarget != null ? Vector3.Distance(position, currentTarget.GetTargetTransform().position) : float.MaxValue;
 
            foreach (ITargetable potentialTarget in potentialTargets)
            {
                if (potentialTarget.GetFactionDetails().GetFaction() != currentFaction) // 같은 팩션이 아닌 경우
                {
                    float distance = Vector3.Distance(position, potentialTarget.GetTargetTransform().position);
                    if (distance < closestDistance)
                    {
                        closestDistance = distance;
                        closestTarget = potentialTarget;
                    }
                }
            }
 
            currentTarget = closestTarget; // 가장 가까운 타겟을 currentTarget에 저장
 
            return closestTarget; // 가장 가까운 타겟을 반환
        }
 
    }
}
 
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