using System.Collections.Generic;
using System.Linq;
using Unity.Netcode;
using UnityEngine;

namespace Northbound
{
    /// <summary>
    /// 네트워크 플레이어의 스폰 위치를 관리
    /// </summary>
    public class NetworkSpawnManager : NetworkBehaviour
    {
        public static NetworkSpawnManager Instance { get; private set; }

        [Header("Spawn Settings")]
        public List<Transform> spawnPoints = new List<Transform>();
        public bool useRandomSpawn = false;
        public bool findSpawnPointsAutomatically = true;
        
        private Dictionary<ulong, int> _clientSpawnIndices = new Dictionary<ulong, int>();
        private int _nextSpawnIndex = 0;

        private void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }
            Instance = this;
        }

        private void Start()
        {
            if (findSpawnPointsAutomatically)
            {
                FindSpawnPoints();
            }

            if (NetworkManager.Singleton != null)
            {
                NetworkManager.Singleton.OnClientConnectedCallback += OnClientConnected;
            }
        }

        private void FindSpawnPoints()
        {
            PlayerSpawnPoint[] points = FindObjectsByType<PlayerSpawnPoint>(FindObjectsSortMode.None);
            
            // spawnIndex로 정렬
            var sortedPoints = points.OrderBy(p => p.spawnIndex == -1 ? int.MaxValue : p.spawnIndex);
            
            spawnPoints.Clear();
            foreach (var point in sortedPoints)
            {
                if (point.isAvailable)
                {
                    spawnPoints.Add(point.transform);
                }
            }

            Debug.Log($"<color=cyan>[SpawnManager] {spawnPoints.Count}개의 스폰 포인트를 찾았습니다.</color>");
        }

        private void OnClientConnected(ulong clientId)
        {
            if (!IsServer) return;

            // 플레이어가 스폰되었을 때 위치 설정
            if (NetworkManager.Singleton.ConnectedClients.TryGetValue(clientId, out var client))
            {
                if (client.PlayerObject != null)
                {
                    Vector3 spawnPosition = GetSpawnPosition(clientId);
                    Quaternion spawnRotation = GetSpawnRotation(clientId);
                    
                    client.PlayerObject.transform.position = spawnPosition;
                    client.PlayerObject.transform.rotation = spawnRotation;
                    
                    Debug.Log($"<color=green>[SpawnManager] 클라이언트 {clientId} 스폰 위치 설정: {spawnPosition}</color>");
                }
            }
        }

        public Vector3 GetSpawnPosition(ulong clientId)
        {
            if (spawnPoints.Count == 0)
            {
                Debug.LogWarning("[SpawnManager] 스폰 포인트가 없습니다. 기본 위치 반환.");
                return Vector3.zero;
            }

            int spawnIndex;

            if (useRandomSpawn)
            {
                spawnIndex = Random.Range(0, spawnPoints.Count);
            }
            else
            {
                if (!_clientSpawnIndices.ContainsKey(clientId))
                {
                    _clientSpawnIndices[clientId] = _nextSpawnIndex;
                    _nextSpawnIndex = (_nextSpawnIndex + 1) % spawnPoints.Count;
                }
                spawnIndex = _clientSpawnIndices[clientId];
            }

            return spawnPoints[spawnIndex].position;
        }

        public Quaternion GetSpawnRotation(ulong clientId)
        {
            if (spawnPoints.Count == 0)
                return Quaternion.identity;

            int spawnIndex = _clientSpawnIndices.ContainsKey(clientId) 
                ? _clientSpawnIndices[clientId] 
                : 0;

            return spawnPoints[spawnIndex].rotation;
        }

        override public void OnDestroy()
        {
            if (NetworkManager.Singleton != null)
            {
                NetworkManager.Singleton.OnClientConnectedCallback -= OnClientConnected;
            }

            base.OnDestroy();
        }
    }
}