#if UNITY_EDITOR || DEVELOPMENT_BUILD

using System;

using UnityEngine;

using Colosseum.Player;

namespace Colosseum.UI
{
    /// <summary>
    /// 공용 UI 모드 컨트롤러.
    /// UIMode 입력(leftAlt)으로 커서 표시/숨김과 게임플레이 입력 차단을 토글합니다.
    /// </summary>
    [DisallowMultipleComponent]
    public class UIModeController : MonoBehaviour
    {
        private static UIModeController instance;

        /// <summary>
        /// 현재 활성화된 UIModeController 인스턴스
        /// </summary>
        public static UIModeController Instance => instance;

        /// <summary>
        /// UI 모드 활성화 여부
        /// </summary>
        public bool IsUIModeActive { get; private set; }

        /// <summary>
        /// UI 모드 상태 변경 이벤트
        /// </summary>
        public event Action<bool> OnUIModeChanged;

        private InputSystem_Actions inputActions;
        private PlayerMovement playerMovement;
        private PlayerSkillInput playerSkillInput;

        private bool previousCursorVisible;
        private CursorLockMode previousCursorLockState;

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

            instance = this;
        }

        private void OnDestroy()
        {
            if (instance == this)
                instance = null;

            CleanupInput();
        }

        private void Start()
        {
            InitializeInput();
        }

        private void Update()
        {
            if (playerSkillInput == null)
                FindLocalPlayerReferences();
        }

        private void InitializeInput()
        {
            if (inputActions != null)
                return;

            inputActions = new InputSystem_Actions();
            inputActions.Player.UIMode.performed += OnUIModePerformed;
            inputActions.Player.UIMode.Enable();
        }

        private void CleanupInput()
        {
            if (inputActions != null)
            {
                inputActions.Player.UIMode.performed -= OnUIModePerformed;
                inputActions.Player.UIMode.Disable();
                inputActions.Dispose();
                inputActions = null;
            }
        }

        private void FindLocalPlayerReferences()
        {
            PlayerSkillInput[] skillInputs = FindObjectsByType<PlayerSkillInput>(FindObjectsSortMode.None);
            for (int i = 0; i < skillInputs.Length; i++)
            {
                if (skillInputs[i] != null && skillInputs[i].IsOwner)
                {
                    playerSkillInput = skillInputs[i];
                    playerMovement = skillInputs[i].GetComponent<PlayerMovement>();
                    break;
                }
            }
        }

        /// <summary>
        /// UI 모드를 수동으로 설정합니다.
        /// </summary>
        public void SetUIModeActive(bool active)
        {
            if (IsUIModeActive == active)
                return;

            IsUIModeActive = active;

            if (active)
            {
                previousCursorVisible = Cursor.visible;
                previousCursorLockState = Cursor.lockState;
                Cursor.visible = true;
                Cursor.lockState = CursorLockMode.None;
                SetGameplayInputBlocked(true);
            }
            else
            {
                SetGameplayInputBlocked(false);
                Cursor.visible = previousCursorVisible;
                Cursor.lockState = previousCursorLockState;
            }

            OnUIModeChanged?.Invoke(IsUIModeActive);
        }

        private void OnUIModePerformed(UnityEngine.InputSystem.InputAction.CallbackContext context)
        {
            SetUIModeActive(!IsUIModeActive);
        }

        private void SetGameplayInputBlocked(bool blocked)
        {
            if (playerMovement != null)
                playerMovement.SetGameplayInputEnabled(!blocked);

            if (playerSkillInput != null)
                playerSkillInput.SetGameplayInputEnabled(!blocked);
        }
    }
}

#endif