using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace AibisDream.UI
{
    public class TerminalChapterPanel : MonoBehaviour
    {
        [SerializeField] private TerminalPanelAnimator panelAnimator;
        [SerializeField] private TerminalChapterItemView leftPreview;
        [SerializeField] private TerminalChapterItemView currentView;
        [SerializeField] private TerminalChapterItemView rightPreview;
        [SerializeField] private TMP_Text emptyText;
        [SerializeField] private TMP_Text selectedTitleText;
        [SerializeField] private Button previousButton;
        [SerializeField] private Button nextButton;
        [SerializeField] private Button restartButton;
        [SerializeField] private Button backButton;

        private readonly List<ChapterVo> _chapters = new List<ChapterVo>();
        private int _currentIndex;

        public bool IsOpen => gameObject.activeSelf;
        private TerminalPanel _owner;

        public void SetOwner(TerminalPanel owner)
        {
            _owner = owner;
        }

        private void Awake()
        {
            previousButton?.onClick.AddListener(Previous);
            nextButton?.onClick.AddListener(Next);
            restartButton?.onClick.AddListener(Restart);
            backButton?.onClick.AddListener(Close);
        }

        private void OnDestroy()
        {
            previousButton?.onClick.RemoveListener(Previous);
            nextButton?.onClick.RemoveListener(Next);
            restartButton?.onClick.RemoveListener(Restart);
            backButton?.onClick.RemoveListener(Close);
        }

        public void Show()
        {
            if (panelAnimator != null)
            {
                panelAnimator.Show(prepare: PrepareContent);
            }
            else
            {
                PrepareContent();
                gameObject.SetActive(true);
            }
        }

        public void Hide(Action onComplete = null)
        {
            if (panelAnimator != null)
            {
                panelAnimator.Hide(onComplete);
            }
            else
            {
                gameObject.SetActive(false);
                onComplete?.Invoke();
            }
        }

        private void PrepareContent()
        {
            _owner?.SetHeader("terminal_header_chapter", "REPAIR_STATION_07 - AUTH_VERIFIED");
            LoadChapters();
            RefreshViews();
        }

        public void Close()
        {
            _owner.Back();
        }

        private void LoadChapters()
        {
            _chapters.Clear();
            var chapters = ChapterController.Instance.GetChapterList();
            _chapters.AddRange(chapters);
            _currentIndex = Mathf.Clamp(_currentIndex, 0, Mathf.Max(0, _chapters.Count - 1));
        }

        private void RefreshViews()
        {
            var hasChapters = _chapters.Count > 0;
            if (emptyText != null)
            {
                emptyText.gameObject.SetActive(!hasChapters);
            }

            var showLeftPreview = hasChapters && _currentIndex > 0;
            var showRightPreview = hasChapters && _currentIndex < _chapters.Count - 1;

            SetViewActive(leftPreview, showLeftPreview);
            SetViewActive(currentView, hasChapters);
            SetViewActive(rightPreview, showRightPreview);

            if (!hasChapters)
            {
                if (selectedTitleText != null)
                {
                    selectedTitleText.text = "NO CHAPTER DATA";
                }

                restartButton?.gameObject.SetActive(false);
                UpdateNavigationButtons(false);
                return;
            }

            var current = _chapters[_currentIndex];
            currentView?.Init(current, selected: true, preview: false);

            if (showLeftPreview)
            {
                leftPreview?.Init(_chapters[_currentIndex - 1], selected: false, preview: true);
            }

            if (showRightPreview)
            {
                rightPreview?.Init(_chapters[_currentIndex + 1], selected: false, preview: true);
            }

            if (selectedTitleText != null)
            {
                selectedTitleText.text = current.title;
            }

            restartButton?.gameObject.SetActive(true);
            UpdateNavigationButtons(true);
        }

        private void UpdateNavigationButtons(bool hasChapters)
        {
            if (previousButton != null)
            {
                previousButton.interactable = hasChapters && _currentIndex > 0;
            }

            if (nextButton != null)
            {
                nextButton.interactable = hasChapters && _currentIndex < _chapters.Count - 1;
            }
        }

        private static void SetViewActive(TerminalChapterItemView view, bool active)
        {
            if (view != null)
            {
                view.gameObject.SetActive(active);
            }
        }

        private void Previous()
        {
            if (_chapters.Count == 0 || _currentIndex <= 0)
            {
                return;
            }

            _currentIndex--;
            RefreshViews();
        }

        private void Next()
        {
            if (_chapters.Count == 0 || _currentIndex >= _chapters.Count - 1)
            {
                return;
            }

            _currentIndex++;
            RefreshViews();
        }

        private void Restart()
        {
            if (_chapters.Count == 0)
            {
                return;
            }

            var chapter = _chapters[_currentIndex];
            _owner.CloseThen(() => ChapterController.Instance.StartWithChapter(chapter));
        }
    }
}