using Core.InputLock;
using Core.SaveSystem;
using Michsky.UI.Reach;
using UI.PanelStack;
using UI.Settings;
using System.Collections;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace UI.PauseMenu
{
    public class InGamePauseMenuController : MonoBehaviour
    {
        [SerializeField] private bool debugLogs = true;
        [Header("Root")]
        [SerializeField] private GameObject menuRoot;

        [Header("Buttons")]
        [SerializeField] private ButtonManager saveAndExitButton;
        [SerializeField] private ButtonManager settingsButton;
        [SerializeField] private ButtonManager returnToGameButton;

        [Header("Settings Panel")]
        [SerializeField] private SettingsController settingsController;

        [Header("Exit")]
        [SerializeField] private int titleSceneBuildIndex = 1;

        private bool isWired;
        private bool handlerRegistered;
        private System.Func<bool> cachedEscapeHandler;

        private void Awake()
        {
            if (menuRoot == null) { menuRoot = gameObject; }
            if (settingsController == null) { settingsController = FindObjectOfType<SettingsController>(true); }
            WireOnce();
            menuRoot.SetActive(false);

            if (cachedEscapeHandler == null) { cachedEscapeHandler = TryOpenFromEscape; }
            if (debugLogs) Debug.Log($"[InGamePause] Awake. menuRoot={menuRoot.name} settingsController={(settingsController!=null)}");
        }

        private void OnEnable()
        {
            StartCoroutine(RegisterEscapeHandlerWhenReady());
        }

        private void OnDisable()
        {
            if (UIPanelStack.Instance != null)
            {
                UIPanelStack.Instance.ClearEscapeOpenHandler(cachedEscapeHandler);
            }
            handlerRegistered = false;
        }

        private IEnumerator RegisterEscapeHandlerWhenReady()
        {
            while (enabled && gameObject.activeInHierarchy && UIPanelStack.Instance == null)
            {
                yield return null;
            }

            if (!enabled || !gameObject.activeInHierarchy) { yield break; }
            if (UIPanelStack.Instance == null) { yield break; }
            if (handlerRegistered) { yield break; }

            UIPanelStack.Instance.SetEscapeOpenHandler(cachedEscapeHandler);
            handlerRegistered = true;
            if (debugLogs) Debug.Log("[InGamePause] Escape handler registered.");
        }

        private bool TryOpenFromEscape()
        {
            if (menuRoot == null) { return false; }
            if (menuRoot.activeInHierarchy) { return false; }
            if (debugLogs) Debug.Log("[InGamePause] TryOpenFromEscape -> Open()");
            Open();
            return true;
        }

        public void Open()
        {
            if (menuRoot == null) { return; }
            if (menuRoot.activeInHierarchy) { return; }

            menuRoot.SetActive(true);
            if (debugLogs) Debug.Log("[InGamePause] Open.");
            if (UIPanelStack.Instance != null)
            {
                UIPanelStack.Instance.Push(UIPanelKind.Pause, menuRoot, Close);
            }

            if (PlayerControlLockService.Instance != null)
            {
                PlayerControlLockService.Instance.Lock(this);
            }
        }

        public void Close()
        {
            if (menuRoot == null) { return; }

            if (UIPanelStack.Instance != null)
            {
                UIPanelStack.Instance.Remove(menuRoot);
            }

            menuRoot.SetActive(false);
            if (debugLogs) Debug.Log("[InGamePause] Close.");

            if (PlayerControlLockService.Instance != null)
            {
                PlayerControlLockService.Instance.Unlock(this);
            }
        }

        private void WireOnce()
        {
            if (isWired) { return; }

            if (saveAndExitButton != null) { saveAndExitButton.onClick.AddListener(OnSaveAndExitClicked); }
            if (settingsButton != null) { settingsButton.onClick.AddListener(OnSettingsClicked); }
            if (returnToGameButton != null) { returnToGameButton.onClick.AddListener(Close); }

            isWired = true;
        }

        private void OnSettingsClicked()
        {
            if (debugLogs) Debug.Log($"[InGamePause] Settings clicked. settingsController={(settingsController!=null)}");
            if (settingsController != null)
            {
                settingsController.OpenAtIndex(0);
            }
        }

        private void OnSaveAndExitClicked()
        {
            if (SaveManager.Instance != null)
            {
                SaveManager.Instance.SaveGame();
            }

            Close();

            if (titleSceneBuildIndex >= 0 && titleSceneBuildIndex < SceneManager.sceneCountInBuildSettings)
            {
                SceneManager.LoadSceneAsync(titleSceneBuildIndex);
            }
        }
    }
}