using System;
using UnityEngine;

namespace AibisDream.UI.Terminal
{
    public class TerminalStartPanel : MonoBehaviour
    {
        [SerializeField] private TerminalPanelAnimator panelAnimator;
        [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()
        {
            RegisterItem(newGameItem, StartNewGame);
            RegisterItem(chapterItem, OpenChapter);
            RegisterItem(settingItem, OpenSetting);
            RegisterItem(quitItem, QuitApp);
        }

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

        public void Show()
        {
            _owner?.SetHeader("<选择章节>", "CHAPER xx/xxx - LOADING - DT");
            if (panelAnimator != null)
            {
                panelAnimator.Show();
            }
            else
            {
                gameObject.SetActive(true);
            }
        }

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

        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 StartNewGame()
        {
            UIManager.Instance.CloseTerminalThen(() => GameManager.Instance.StartNewGame());
        }

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

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

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