using System;
using Unity.Netcode;
using Unity.Netcode.Components;
using UnityEngine;
using UnityEngine.InputSystem;
using Unity.Cinemachine;
using Northbound;

public class NetworkPlayerController : NetworkBehaviour, ITeamMember, IDamageable
{
    [Header("Movement Settings")]
    public float moveSpeed = 5f;
    public float rotationSpeed = 10f;

    [Header("Team Settings")]
    [SerializeField] private TeamType initialTeam = TeamType.Player;

    [Header("Health Settings")]
    [SerializeField] private int maxHealth = 100;

    [Header("Visual Effects")]
    [SerializeField] private GameObject damageEffectPrefab;
    [SerializeField] private GameObject deathEffectPrefab;

    // 이 플레이어를 제어하는 클라이언트 ID (서버 소유권이지만 논리적 소유자)
    private NetworkVariable<ulong> _ownerPlayerId = new NetworkVariable<ulong>(
        ulong.MaxValue,
        NetworkVariableReadPermission.Everyone,
        NetworkVariableWritePermission.Server
    );

    private NetworkVariable<TeamType> _team = new NetworkVariable<TeamType>(
        TeamType.Player,
        NetworkVariableReadPermission.Everyone,
        NetworkVariableWritePermission.Server
    );

    private NetworkVariable<int> _currentHealth = new NetworkVariable<int>(
        100,
        NetworkVariableReadPermission.Everyone,
        NetworkVariableWritePermission.Server
    );

    private Vector2 _moveInput;
    private CharacterController _controller;
    private PlayerInputActions _inputActions;
    private Animator _animator;
    private NetworkAnimator _networkAnimator;

    // 이 플레이어가 로컬 플레이어인지 확인
    public bool IsLocalPlayer => _ownerPlayerId.Value == NetworkManager.Singleton.LocalClientId;

    public ulong OwnerPlayerId => _ownerPlayerId.Value;

    // 소유자 변경 이벤트
    public event Action<ulong> OnOwnerChanged;

    void Awake()
    {
        _controller = GetComponent<CharacterController>();
        _animator = GetComponent<Animator>();
        _networkAnimator = GetComponent<NetworkAnimator>();
    }

    public override void OnNetworkSpawn()
    {
        base.OnNetworkSpawn();

        // 서버에서 초기화
        if (IsServer)
        {
            if (_team.Value == TeamType.Neutral)
            {
                _team.Value = initialTeam;
            }

            if (_currentHealth.Value == 0)
            {
                _currentHealth.Value = maxHealth;
            }
        }

        // 이벤트 구독
        _currentHealth.OnValueChanged += OnHealthChanged;
        _ownerPlayerId.OnValueChanged += OnOwnerPlayerIdChanged;

        // 이미 로컬 플레이어로 설정되어 있으면 입력 초기화
        TryInitializeLocalPlayer();
    }

    private void OnOwnerPlayerIdChanged(ulong previousValue, ulong newValue)
    {
        OnOwnerChanged?.Invoke(newValue);
        TryInitializeLocalPlayer();
    }

    private void TryInitializeLocalPlayer()
    {
        if (!IsLocalPlayer) return;
        if (_inputActions != null) return; // 이미 초기화됨

        var vcam = GameObject.FindFirstObjectByType<CinemachineCamera>();

        if (vcam != null)
        {
            vcam.Follow = transform;
            vcam.LookAt = transform;
        }

        _inputActions = new PlayerInputActions();
        _inputActions.Enable();
    }

    /// <summary>
    /// 플레이어 초기화 (서버에서 호출)
    /// </summary>
    public void Initialize(ulong ownerPlayerId)
    {
        if (!IsServer) return;
        _ownerPlayerId.Value = ownerPlayerId;
    }

    public override void OnNetworkDespawn()
    {
        _currentHealth.OnValueChanged -= OnHealthChanged;
        _ownerPlayerId.OnValueChanged -= OnOwnerPlayerIdChanged;

        if (IsLocalPlayer && _inputActions != null)
        {
            _inputActions.Disable();
        }

        base.OnNetworkDespawn();
    }

    void Update()
    {
        // 로컬 플레이어만 입력 처리
        if (!IsLocalPlayer) return;

        // 입력 시스템이 초기화되지 않았으면 스킵
        if (_inputActions == null) return;

        // 죽었으면 이동 불가
        if (_currentHealth.Value <= 0) return;

        // 액션/상호작용 중이면 이동 불가
        var attackAction = GetComponent<AttackAction>();
        var playerInteraction = GetComponent<PlayerInteraction>();
        
        bool isActionBlocked = (attackAction != null && attackAction.IsAttacking) ||
                              (playerInteraction != null && playerInteraction.IsInteracting);
        
        if (isActionBlocked) 
        {
            // 서버에 이동 중지 알림 (애니메이션 포함)
            MoveServerRpc(Vector2.zero);
            return;
        }

        _moveInput = _inputActions.Player.Move.ReadValue<Vector2>();
        
        // 서버에 이동 요청 전송 (애니메이션 포함)
        MoveServerRpc(_moveInput);
    }

    [Rpc(SendTo.Server)]
    private void MoveServerRpc(Vector2 moveInput)
    {
        // 죽었으면 이동 불가
        if (_currentHealth.Value <= 0) return;

        Vector3 move = new Vector3(moveInput.x, 0, moveInput.y).normalized;

        // NetworkAnimator로 애니메이션 동기화
        if (_networkAnimator != null)
        {
            _networkAnimator.Animator.SetFloat("MoveSpeed", move.magnitude);
        }

        if (move.magnitude >= 0.1f)
        {
            Quaternion targetRotation = Quaternion.LookRotation(move);
            transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, rotationSpeed * Time.deltaTime);

            if (_controller != null)
            {
                _controller.Move(move * moveSpeed * Time.deltaTime);
            }
        }
    }

    #region ITeamMember Implementation

    public TeamType GetTeam() => _team.Value;

    public void SetTeam(TeamType team)
    {
        if (!IsServer) return;
        
        TeamType previousTeam = _team.Value;
        _team.Value = team;
    }

    #endregion

    #region IDamageable Implementation
    public void TakeDamage(int damage, ulong attackerId)
    {
        if (!IsServer) return;

        // 이미 죽었으면 무시
        if (_currentHealth.Value <= 0) return;

        // 공격자의 팀 확인
        if (NetworkManager.Singleton.SpawnManager.SpawnedObjects.TryGetValue(attackerId, out NetworkObject attackerObj))
        {
            var attackerTeamMember = attackerObj.GetComponent<ITeamMember>();
            if (attackerTeamMember != null)
            {
                if (!TeamManager.CanAttack(attackerTeamMember, this))
                {
                    return;
                }
            }
        }

        // 데미지 적용
        int actualDamage = Mathf.Min(damage, _currentHealth.Value);
        _currentHealth.Value -= actualDamage;

        // 데미지 이펙트
        ShowDamageEffectClientRpc();

        // 체력이 0이 되면 사망
        if (_currentHealth.Value <= 0)
        {
            Die(attackerId);
        }
    }

    private void Die(ulong killerId)
    {
        if (!IsServer) return;

        // 사망 이펙트
        ShowDeathEffectClientRpc();

        // 애니메이션 - NetworkAnimator로 동기화
        if (_networkAnimator != null)
        {
            _networkAnimator.SetTrigger("Die");
        }

        // 일정 시간 후 리스폰 또는 디스폰
        Invoke(nameof(HandleDeath), 3f);
    }

    private void HandleDeath()
    {
        if (!IsServer) return;

        Respawn();
    }

    private void Respawn()
    {
        if (!IsServer) return;

        // 체력 회복
        _currentHealth.Value = maxHealth;

        // 스폰 포인트로 이동
        var spawnPoints = FindObjectsByType<PlayerSpawnPoint>(FindObjectsSortMode.None);
        if (spawnPoints.Length > 0)
        {
            var spawnPoint = spawnPoints[UnityEngine.Random.Range(0, spawnPoints.Length)];
            transform.position = spawnPoint.transform.position;
            transform.rotation = spawnPoint.transform.rotation;
        }

        // NetworkAnimator로 애니메이션 동기화
        if (_networkAnimator != null)
        {
            _networkAnimator.SetTrigger("Revive");
        }
    }

    [ClientRpc]
    private void ShowDamageEffectClientRpc()
    {
        if (damageEffectPrefab != null)
        {
            GameObject effect = Instantiate(damageEffectPrefab, transform.position + Vector3.up, Quaternion.identity);
            Destroy(effect, 2f);
        }
    }

    [ClientRpc]
    private void ShowDeathEffectClientRpc()
    {
        if (deathEffectPrefab != null)
        {
            GameObject effect = Instantiate(deathEffectPrefab, transform.position, Quaternion.identity);
            Destroy(effect, 3f);
        }
    }

    #endregion

    #region Health Management

    public int GetCurrentHealth() => _currentHealth.Value;

    public int GetMaxHealth() => maxHealth;

    public float GetHealthPercentage()
    {
        return maxHealth > 0 ? (float)_currentHealth.Value / maxHealth : 0f;
    }

    public bool IsDead() => _currentHealth.Value <= 0;

    public void Heal(int amount)
    {
        if (!IsServer) return;

        int healAmount = Mathf.Min(amount, maxHealth - _currentHealth.Value);
        _currentHealth.Value += healAmount;
    }

    private void OnHealthChanged(int previousValue, int newValue)
    {
        if (IsLocalPlayer)
        {
            // UI 업데이트 등
        }
    }

    #endregion

    #region Gizmos

    private void OnDrawGizmosSelected()
    {
        #if UNITY_EDITOR
        if (Application.isPlaying)
        {
            string teamName = TeamManager.GetTeamName(_team.Value);
            UnityEditor.Handles.Label(transform.position + Vector3.up * 3f, 
                $"Player: {gameObject.name}\nTeam: {teamName}\nHP: {_currentHealth.Value}/{maxHealth}");
        }
        else
        {
            string teamName = TeamManager.GetTeamName(initialTeam);
            UnityEditor.Handles.Label(transform.position + Vector3.up * 3f, 
                $"Player: {gameObject.name}\nTeam: {teamName}\nHP: {maxHealth}/{maxHealth}");
        }
        #endif
    }

    #endregion
}