using UnityEngine;
using UnityEngine.InputSystem;
using Unity.Netcode; // NGO 필수 네임스페이스
using Unity.Netcode.Components;

[RequireComponent(typeof(NetworkObject))]
public class PlayerNetworkController : NetworkBehaviour
{
    [Header("Movement Settings")]
    public float moveSpeed = 5f;
    public float rotationSpeed = 10f;
    public float jumpHeight = 1.5f;
    public float gravity = -19.62f;

    [Header("Interaction Settings")]
    [SerializeField] private float interactRange = 3f;
    [SerializeField] private LayerMask interactableLayer;
    [SerializeField] private LayerMask constructionLayer;
    [SerializeField] private float buildSpeedMultiplier = 2f;

    [Header("Mining Settings")]
    [SerializeField] private float attackRange = 1.5f;
    [SerializeField] private int miningDamage = 25;
    [SerializeField] private LayerMask mineableLayer; // 'Mineable' 레이어 설정 필요

    private CharacterController _controller;
    private PlayerInputActions _inputActions;
    private Animator _animator;
    private TunnelTraveler _traveler;

    private Vector2 _moveInput;
    private Vector3 _velocity;
    private Vector3 _currentMoveDir;
    private bool _isGrounded;
    private bool _isHoldingInteract = false;

    // NGO에서 Start 대신 사용하는 네트워크 초기화 메서드
    public override void OnNetworkSpawn()
    {
        // 내 캐릭터가 아니라면 입력을 활성화하지 않습니다.
        if (!IsOwner) return;

        _inputActions = new PlayerInputActions();
        _inputActions.Player.Jump.performed += ctx => OnJump();
        _inputActions.Player.Attack.performed += ctx => OnAttackServerRpc(); // 서버에 공격 요청
        _inputActions.Player.Interact.performed += ctx => OnInteractTap();

        _inputActions.Player.Interact.started += ctx => _isHoldingInteract = true;
        _inputActions.Player.Interact.canceled += ctx => _isHoldingInteract = false;

        _inputActions.Enable();
    }

    void Awake()
    {
        _controller = GetComponent<CharacterController>();
        _animator = GetComponent<Animator>();
        _traveler = GetComponent<TunnelTraveler>();
    }

    void Update()
    {
        // [중요] '나'의 캐릭터가 아니면 조종 로직을 아예 실행하지 않습니다.
        if (!IsOwner) return;
        if (_traveler != null && _traveler.IsTraveling) return;

        HandleGravity();
        HandleMovement();

        // 건설 가속 로직
        if (_isHoldingInteract) PerformConstructionSupport();
    }

    private void HandleMovement()
    {
        _isGrounded = _controller.isGrounded;
        _animator.SetBool("isGrounded", _isGrounded);

        bool isAttacking = _animator.GetCurrentAnimatorStateInfo(0).IsTag("Attack");
        _moveInput = _inputActions.Player.Move.ReadValue<Vector2>();
        Vector3 move = new Vector3(_moveInput.x, 0, _moveInput.y).normalized;

        // 지상/공중 및 공격 중 관성 처리
        if (isAttacking) move = _isGrounded ? Vector3.zero : _currentMoveDir;
        else if (move.magnitude > 0.1f) _currentMoveDir = move;

        if (move.magnitude >= 0.1f)
        {
            if (!isAttacking)
            {
                Quaternion targetRotation = Quaternion.LookRotation(move);
                transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, rotationSpeed * Time.deltaTime);
            }
            _controller.Move(move * moveSpeed * Time.deltaTime);
        }

        _animator.SetFloat("MoveSpeed", isAttacking && _isGrounded ? 0 : move.magnitude);
    }

    private void HandleGravity()
    {
        if (_isGrounded && _velocity.y < 0) _velocity.y = -2f;
        _velocity.y += gravity * Time.deltaTime;
        _controller.Move(_velocity * Time.deltaTime);
    }

    private void OnJump()
    {
        if (_isGrounded) _velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
    }

    // 기존 OnAttackServerRpc를 수정하거나 호출되는 시점에 아래 로직 포함
    [Rpc(SendTo.Server, InvokePermission = RpcInvokePermission.Owner)]
    private void OnAttackServerRpc()
    {
        // 모든 유저에게 애니메이션 재생 신호 전송
        OnAttackClientRpc();

        // [채광 판정] 서버에서 물리 연산을 통해 전방의 블록 탐색
        Collider[] hitBlocks = Physics.OverlapSphere(transform.position + transform.forward, attackRange, mineableLayer);

        foreach (var col in hitBlocks)
        {
            MineableBlock block = col.GetComponentInParent<MineableBlock>();
            if (block != null)
            {
                // 서버가 직접 블록의 대미지 함수 호출
                block.TakeDamageRpc(miningDamage);
            }
        }
    }

    [ClientRpc]
    private void OnAttackClientRpc()
    {
        _animator.SetTrigger("Attack");
    }

    private void OnInteractTap()
    {
        _animator.SetTrigger("Interact");

        Collider[] colliders = Physics.OverlapSphere(transform.position, interactRange, interactableLayer);
        foreach (var col in colliders)
        {
            IInteractable interactable = col.GetComponentInParent<IInteractable>();
            if (interactable != null)
            {
                interactable.Interact(gameObject);
                break;
            }
        }
    }

    private void PerformConstructionSupport()
    {
        Collider[] targets = Physics.OverlapSphere(transform.position, interactRange, constructionLayer);
        foreach (var col in targets)
        {
            ConstructionSite site = col.GetComponentInParent<ConstructionSite>();
            if (site != null)
            {
                // 건설 진행도는 서버에서 관리하는 것이 안전하므로 나중에 RPC로 전환 필요
                site.AdvanceConstruction(Time.deltaTime * buildSpeedMultiplier);
            }
        }
    }

    public override void OnNetworkDespawn()
    {
        if (IsOwner) _inputActions.Disable();
    }
}