using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.InputSystem;
using UnityEngine.EventSystems;

using RR.Common.Managers;
using RR.Game2D.Core.Managers;
using RR.Common.Behaviour.ScriptableObjects;

namespace RR.Common.UI
{
    [RequireComponent(typeof(CanvasGroup), typeof(SettingsUIList))]
    public class SettingsUI : MonoBehaviour
    {
        [Header("Управление")]
        [SerializeField] private InputActionReference triggerKey;
        [SerializeField] private Button saveButton;
        
        [Header("UI")]
        [SerializeField] private CanvasGroup canvasGroup;
        [SerializeField] private Transform content;
        [SerializeField] private float fadeDuration = 0.15f;
        
        SettingsUIList settingsUIList;
        
        private SettingsManager settingsManager;
        private GameSettings currentSettings;

        private void Awake()
        {
            settingsManager = SettingsManager.Instance;
            
            if (settingsManager == null)
            {
                GameManager.Logger.LogError(name, "SettingsManager is null!");
                return;
            }
            
            settingsManager.OnSettingsLoaded += UpdateSettings;
            settingsManager.OnSettingsSaved += SaveSettingsHandler;
            
            currentSettings = settingsManager.GetCurrentGameSettings();
            
            if (saveButton) saveButton.onClick.AddListener(SaveAndClose);
            
            gameObject.SetActive(false);
        }
        
        public void Open()
        {
            gameObject.SetActive(true);
            StopAllCoroutines();
            StartCoroutine(Fade(0f, 1f, fadeDuration));
        }

        private void Close()
        {
            
        }

        private void Save()
        {
            
        }
        
        public void SaveAndClose()
        {
            Save();
            Close();
        }
        
        private void UpdateSettings()
        {
            settingsUIList = content.GetComponent<SettingsUIList>();
            if (settingsUIList != null)
            {
                settingsUIList.UpdateSettings(settingsManager.GetCurrentGameSettings());
            }
        }
        
        private void SaveSettingsHandler()
        {
            GameManager.Logger.Log(name, "Saved settings");
        }
        
        /// <summary>
        /// Метод для плавного перехода (затухания)
        /// </summary>
        /// <param name="from">Начальная прозрачность</param>
        /// <param name="to">Конечная прозрачнеость</param>
        /// <param name="time">Время перехода</param>
        /// <param name="onDone">Действие при выполнении перехода</param>
        private IEnumerator Fade(float from, float to, float time, System.Action onDone = null)
        {
            if (!canvasGroup) { onDone?.Invoke(); yield break; }
            float t = 0f;
            canvasGroup.alpha = from;
            canvasGroup.blocksRaycasts = true;
            while (t < time)
            {
                t += Time.unscaledDeltaTime;
                canvasGroup.alpha = Mathf.Lerp(from, to, t / time);
                yield return null;
            }
            canvasGroup.alpha = to;
            canvasGroup.blocksRaycasts = to > 0.99f;
            onDone?.Invoke();
        }
    }
}