using System;
using AibisDream;
using AibisDream.SaveSystem;
using UnityEngine;

namespace AibisDream.UI
{
    public class TerminalStartPanel : MonoBehaviour
    {
        [SerializeField] private TerminalPanelAnimator panelAnimator;
        [SerializeField] private TerminalMenuItemView continueGameItem;
        [SerializeField] private TerminalMenuItemView newGameItem;
        [SerializeField] private TerminalMenuItemView chapterItem;
        [SerializeField] private TerminalMenuItemView settingItem;
        [SerializeField] private TerminalMenuItemView quitItem;

        private TerminalPanel _owner;
        private TerminalMenuItemView _selectedItem;

        public bool IsOpen => gameObject.activeSelf;

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

        private void Awake()
        {
            InitMenuItems();
            RegisterItem(continueGameItem, ContinueGame);
            RegisterItem(newGameItem, StartNewGame);
            RegisterItem(chapterItem, OpenChapter);
            RegisterItem(settingItem, OpenSetting);
            RegisterItem(quitItem, QuitApp);
        }

        private void OnDestroy()
        {
            UnregisterItem(continueGameItem);
            UnregisterItem(newGameItem);
            UnregisterItem(chapterItem);
            UnregisterItem(settingItem);
            UnregisterItem(quitItem);
        }

        public void Show()
        {
            RefreshContinueVisibility();

            if (panelAnimator != null)
            {
                panelAnimator.Show(prepare: () => _owner?.SetHeader("termnial_header_start", "REPAIR_STATION_07 - AUTH_VERIFIED"));
            }
            else
            {
                _owner?.SetHeader("termnial_header_start", "REPAIR_STATION_07 - AUTH_VERIFIED");
                gameObject.SetActive(true);
            }
        }

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

        private void InitMenuItems()
        {
            continueGameItem?.SetContent("start_continue", "SESSION RESUME", BuildContinueDetail());
            newGameItem?.SetContent("start_newGame", "SESSION CREATE", "STATUS: ACTIVE");
            chapterItem?.SetContent("start_selcetLevel", "HISTORY QUERY", "RANGE: 04/533");
            settingItem?.SetContent("start_setting", "USER CONFIG", "AUTH: LOCAL");
            quitItem?.SetContent("start_quit", "SESSION CLOSE", "LOG: SAVED");
        }

        private void RefreshContinueVisibility()
        {
            if (continueGameItem == null)
            {
                return;
            }

            var hasAutoSave = SlotManager.HasAutoSave();
            continueGameItem.gameObject.SetActive(hasAutoSave);

            if (!hasAutoSave)
            {
                if (_selectedItem == continueGameItem)
                {
                    _selectedItem = null;
                }

                return;
            }

            continueGameItem.SetContent("start_continue", "SESSION RESUME", BuildContinueDetail());

            if (_selectedItem == null || _selectedItem == continueGameItem)
            {
                SelectItem(continueGameItem);
            }
        }

        private static string BuildContinueDetail()
        {
            var meta = SlotManager.LoadMeta(SlotIndex.Auto);
            if (meta == null)
            {
                return "STATUS: READY";
            }

            if (!string.IsNullOrEmpty(meta.sceneSoName))
            {
                return $"LAST: {meta.sceneSoName}";
            }

            if (!string.IsNullOrEmpty(meta.savedAt))
            {
                return $"LAST: {meta.savedAt}";
            }

            return "STATUS: READY";
        }

        private void RegisterItem(TerminalMenuItemView item, Action action)
        {
            if (item == null)
            {
                return;
            }

            item.Hovered += SelectItem;
            item.Clicked += _ => action?.Invoke();
        }

        private void UnregisterItem(TerminalMenuItemView item)
        {
            if (item == null)
            {
                return;
            }

            item.Hovered -= SelectItem;
        }

        private void SelectItem(TerminalMenuItemView item)
        {
            if (_selectedItem != null)
            {
                _selectedItem.SetSelected(false);
            }

            _selectedItem = item;
            _selectedItem?.SetSelected(true);
        }

        private static void ContinueGame()
        {
            var terminal = UIManager.Instance.GetPanel<TerminalPanel>();
            if (terminal != null && terminal.IsOpen)
            {
                terminal.CloseThen(() => GameManager.Instance.TryRestoreSlot(SlotIndex.Auto));
                return;
            }

            GameManager.Instance.TryRestoreSlot(SlotIndex.Auto);
        }

        private static void StartNewGame()
        {
            var terminal = UIManager.Instance.GetPanel<TerminalPanel>();
            if (terminal != null && terminal.IsOpen)
            {
                terminal.CloseThen(() => GameManager.Instance.TryStartNewGame());
                return;
            }

            GameManager.Instance.TryStartNewGame();
        }

        private void OpenChapter()
        {
            _owner.SwitchTo(TerminalPage.Chapter);
        }

        private void OpenSetting()
        {
            _owner.SwitchTo(TerminalPage.Setting);
        }

        private static void QuitApp()
        {
            GameManager.Instance.QuitApplication();
        }
    }
}