using UnityEngine;
using UnityEngine.InputSystem;
using Unity.Netcode;
using Colosseum.Network;
using Colosseum.Skills;

namespace Colosseum.Player
{
    /// <summary>
    /// 3인칭 플레이어 이동 (네트워크 동기화)
    /// </summary>
    [RequireComponent(typeof(CharacterController))]
    public class PlayerMovement : NetworkBehaviour
    {
        [Header("Movement Settings")]
        [SerializeField] private float moveSpeed = 5f;
        [SerializeField] private float rotationSpeed = 10f;
        [SerializeField] private float gravity = -9.81f;

        [Header("Jump Settings")]
        [SerializeField] private float jumpForce = 5f;

        [Header("References")]
        [SerializeField] private SkillController skillController;
        [SerializeField] private Animator animator;

        private CharacterController characterController;
        private Vector3 velocity;
        private Vector2 moveInput;
        private InputSystem_Actions inputActions;
        private bool isJumping;
        private bool wasGrounded;

        /// <summary>
        /// 현재 이동 속도 (애니메이션용)
        /// </summary>
        public float CurrentMoveSpeed => moveInput.magnitude * moveSpeed;


        /// <summary>
        /// 현재 지면 접촉 상태
        /// </summary>
        public bool IsGrounded => characterController != null ? characterController.isGrounded : false;


        /// <summary>
        /// 점프 중 상태
        /// </summary>
        public bool IsJumping => isJumping;

        public override void OnNetworkSpawn()
        {
            // 로컬 플레이어가 아니면 입력 비활성화
            if (!IsOwner)
            {
                enabled = false;
                return;
            }

            characterController = GetComponent<CharacterController>();

            // SkillController 참조
            if (skillController == null)
            {
                skillController = GetComponent<SkillController>();
            }

            // Animator 참조
            if (animator == null)
            {
                animator = GetComponentInChildren<Animator>();
            }

            // 스폰 포인트에서 위치 설정
            SetSpawnPosition();

            // Input Actions 초기화
            InitializeInputActions();

            // 카메라 설정
            SetupCamera();
        }

        /// <summary>
        /// 입력 액션 초기화
        /// </summary>
        private void InitializeInputActions()
        {
            inputActions = new InputSystem_Actions();
            inputActions.Player.Enable();

            // Move 액션 콜백 등록
            inputActions.Player.Move.performed += OnMovePerformed;
            inputActions.Player.Move.canceled += OnMoveCanceled;

            // Jump 액션 콜백 등록
            inputActions.Player.Jump.performed += OnJumpPerformed;
        }

        /// <summary>
        /// 입력 액션 해제
        /// </summary>
        private void CleanupInputActions()
        {
            if (inputActions != null)
            {
                inputActions.Player.Move.performed -= OnMovePerformed;
                inputActions.Player.Move.canceled -= OnMoveCanceled;
                inputActions.Player.Jump.performed -= OnJumpPerformed;
                inputActions.Player.Disable();
            }
        }

        private void OnDisable()
        {
            // 컴포넌트 비활성화 시 입력 해제
            CleanupInputActions();
            
            // 입력 초기화
            moveInput = Vector2.zero;
        }

        private void OnEnable()
        {
            // 컴포넌트 재활성화 시 입력 다시 등록
            if (IsOwner && inputActions != null)
            {
                inputActions.Player.Enable();
                inputActions.Player.Move.performed += OnMovePerformed;
                inputActions.Player.Move.canceled += OnMoveCanceled;
                inputActions.Player.Jump.performed += OnJumpPerformed;
            }
        }

        /// <summary>
        /// 스폰 위치 설정
        /// </summary>
        private void SetSpawnPosition()
        {
            Transform spawnPoint = PlayerSpawnPoint.GetRandomSpawnPoint();

            if (spawnPoint != null)
            {
                // CharacterController 비활성화 후 위치 설정 (충돌 문제 방지)
                characterController.enabled = false;
                transform.position = spawnPoint.position;
                transform.rotation = spawnPoint.rotation;
                characterController.enabled = true;
            }
        }

        /// <summary>
        /// 네트워크 정리
        /// </summary>
        public override void OnNetworkDespawn()
        {
            CleanupInputActions();
        }

        private void OnMovePerformed(InputAction.CallbackContext context)
        {
            moveInput = context.ReadValue<Vector2>();
        }

        private void OnMoveCanceled(InputAction.CallbackContext context)
        {
            moveInput = Vector2.zero;
        }

        private void OnJumpPerformed(InputAction.CallbackContext context)
        {
            if (!isJumping && characterController.isGrounded)
            {
                Jump();
            }
        }

        private void SetupCamera()
        {
            var cameraController = GetComponent<PlayerCamera>();
            if (cameraController == null)
            {
                cameraController = gameObject.AddComponent<PlayerCamera>();
            }
            cameraController.Initialize(transform, inputActions);
        }

        /// <summary>
        /// 카메라 재설정 (씬 로드 후 호출)
        /// </summary>
        public void RefreshCamera()
        {
            SetupCamera();
        }

        private void Update()
        {
            if (!IsOwner) return;

            ApplyGravity();
            Move();
        }

        private void ApplyGravity()
        {
            if (wasGrounded && velocity.y < 0)
            {
                velocity.y = -2f;
            }
            else
            {
                velocity.y += gravity * Time.deltaTime;
            }
        }

        private void Move()
        {
            if (characterController == null) return;

            // 스킬 애니메이션 재생 중에는 이동 불가 (루트 모션은 OnAnimatorMove에서 처리)
            if (skillController != null && skillController.IsPlayingAnimation)
            {
                // 루트 모션을 사용하지 않는 경우 중력만 적용
                if (!skillController.UsesRootMotion)
                {
                    characterController.Move(velocity * Time.deltaTime);
                }
                return;
            }

            // 이동 방향 계산 (카메라 기준)
            Vector3 moveDirection = new Vector3(moveInput.x, 0f, moveInput.y);
            moveDirection = TransformDirectionByCamera(moveDirection);
            moveDirection.Normalize();

            // 이동 적용
            Vector3 moveVector = moveDirection * moveSpeed * Time.deltaTime;
            characterController.Move(moveVector + velocity * Time.deltaTime);

            // 회전 (이동 중일 때만)
            if (moveDirection != Vector3.zero)
            {
                Quaternion targetRotation = Quaternion.LookRotation(moveDirection);
                transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, rotationSpeed * Time.deltaTime);
            }

            // 착지 체크 (Move 후에 isGrounded가 업데이트됨)
            if (!wasGrounded && characterController.isGrounded && isJumping)
            {
                OnJumpEnd();
            }

            // 다음 프레임을 위해 현재 상태 저장
            wasGrounded = characterController.isGrounded;
        }

        private void Jump()
        {
            isJumping = true;
            velocity.y = jumpForce;

            // 애니메이션 컨트롤러에 점프 알림
            var animController = GetComponent<PlayerAnimationController>();
            if (animController != null)
            {
                animController.PlayJump();
            }
        }

        /// <summary>
        /// 점프 중 상태가 끝나면 IsJumping = false;
        /// </summary>
        public void OnJumpEnd()
        {
            isJumping = false;
        }

        private Vector3 TransformDirectionByCamera(Vector3 direction)
        {
            if (Camera.main == null) return direction;

            Transform cameraTransform = Camera.main.transform;
            Vector3 cameraForward = cameraTransform.forward;
            Vector3 cameraRight = cameraTransform.right;

            // Y축 제거
            cameraForward.y = 0f;
            cameraRight.y = 0f;
            cameraForward.Normalize();
            cameraRight.Normalize();

            return cameraRight * direction.x + cameraForward * direction.z;
        }

        /// <summary>
        /// 루트 모션 처리. 스킬 애니메이션 중에 애니메이션의 이동/회전 데이터를 적용합니다.
        /// </summary>
        private void OnAnimatorMove()
        {
            if (!IsOwner) return;
            if (animator == null || characterController == null) return;
            if (skillController == null || !skillController.IsPlayingAnimation) return;
            if (!skillController.UsesRootMotion) return;

            // 루트 모션 이동 적용
            Vector3 deltaPosition = animator.deltaPosition;

            // Y축 무시 설정 시 중력 유지
            if (skillController.IgnoreRootMotionY)
            {
                deltaPosition.y = 0f;
                characterController.Move(deltaPosition + velocity * Time.deltaTime);
            }
            else
            {
                characterController.Move(deltaPosition);
            }

            // 루트 모션 회전 적용
            if (animator.deltaRotation != Quaternion.identity)
            {
                transform.rotation *= animator.deltaRotation;
            }

            // 착지 체크
            if (!wasGrounded && characterController.isGrounded && isJumping)
            {
                OnJumpEnd();
            }

            wasGrounded = characterController.isGrounded;
        }
    }
}