using System;
using AibisDream;
using AibisDream.Framework;
using UnityEngine;

namespace AibisDream.UI
{
    /// <summary>
    /// 终端 Setting Page（遗留类名 Panel）。可挂在主菜单或局内 Panel 壳下。
    /// </summary>
    public class TerminalSettingPanel : MonoBehaviour
    {
        [SerializeField] private TerminalPanelAnimator panelAnimator;
        [SerializeField] private SliderItem volumeSlider;
        [SerializeField] private SelectItem textSpeedOption;
        [SerializeField] private SelectItem windowModeOption;
        [SerializeField] private SelectItem languageOption;
        [SerializeField] private TerminalButton continueButton;
        [SerializeField] private TerminalButton backToMainButton;
        [SerializeField] private TerminalButton quitButton;

        public bool IsOpen => gameObject.activeSelf;
        private ITerminalPanelHost _owner;
        private RectTransform _continueButtonRect;
        private Vector2 _continueButtonDefaultPosition;
        private bool _hasContinueButtonDefaultPosition;

        private static readonly UIFormOption[] WindowModeOptions =
        {
            new UIFormOption { prop = "FullScreen", label = "setting_window_fullscreen" },
            new UIFormOption { prop = "Windowed", label = "setting_window_windowed" },
        };

        private static readonly UIFormOption[] LanguageOptions =
        {
            new UIFormOption { prop = "zh-Hans", label = "中文" },
            new UIFormOption { prop = "en", label = "English" },
            new UIFormOption { prop = "ja-JP", label = "日本語" },
            new UIFormOption { prop = "ru", label = "Русский" },
            new UIFormOption { prop = "es", label = "Español" },
            new UIFormOption { prop = "pt-BR", label = "Português" },
        };

        private static readonly UIFormOption[] TextSpeedOptions =
        {
            new UIFormOption { prop = TextSpeedSettings.SlowValue, label = "setting_textSpeed_slow" },
            new UIFormOption { prop = TextSpeedSettings.DefaultValue, label = "setting_textSpeed_default" },
            new UIFormOption { prop = TextSpeedSettings.FastValue, label = "setting_textSpeed_fast" },
        };

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

        private void Awake()
        {
            BindButton(continueButton, BackToGame);
            BindButton(backToMainButton, BackToMain);
            BindButton(quitButton, QuitApp);

            if (continueButton != null)
            {
                _continueButtonRect = continueButton.transform as RectTransform;
                if (_continueButtonRect != null)
                {
                    _continueButtonDefaultPosition = _continueButtonRect.anchoredPosition;
                    _hasContinueButtonDefaultPosition = true;
                }
            }
        }

        private void OnDestroy()
        {
            UnbindButton(continueButton, BackToGame);
            UnbindButton(backToMainButton, BackToMain);
            UnbindButton(quitButton, QuitApp);
        }

        private static void BindButton(TerminalButton terminalButton, UnityEngine.Events.UnityAction action)
        {
            terminalButton?.Button?.onClick.AddListener(action);
        }

        private static void UnbindButton(TerminalButton terminalButton, UnityEngine.Events.UnityAction action)
        {
            terminalButton?.Button?.onClick.RemoveListener(action);
        }

        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_setting", "AUTH_VERIFIED");
            InitControls();
            RefreshControls();
            RefreshFooterButtons();
        }

        private void InitControls()
        {
            volumeSlider?.Init("Volume", "setting_volume", 0f, 1f, OnSettingChanged);
            textSpeedOption?.Init("TextSpeed", "setting_textSpeed", TextSpeedOptions, OnSettingChanged);
            windowModeOption?.Init("WindowMode", "setting_window", WindowModeOptions, OnSettingChanged);
            languageOption?.Init("Language", "setting_language", LanguageOptions, OnSettingChanged);
        }

        private void RefreshControls()
        {
            var settings = SettingLoader.Instance.ReadAll();
            if (settings.TryGetValue("Volume", out var volume))
            {
                volumeSlider?.SetValue(volume);
            }

            textSpeedOption?.SetValue(TextSpeedSettings.CurrentCanonicalValue);

            if (settings.TryGetValue("WindowMode", out var windowMode))
            {
                windowModeOption?.SetValue(windowMode);
            }

            if (settings.TryGetValue("Language", out var language))
            {
                languageOption?.SetValue(LocalizationKit.ResolveLanguage(language));
            }
        }

        private static void OnSettingChanged(string propName, string value)
        {
            SettingLoader.Instance.Write(propName, value);
        }

        private void RefreshFooterButtons()
        {
            var inGame = _owner != null && _owner.IsInGameContext;

            continueButton?.gameObject.SetActive(true);
            backToMainButton?.gameObject.SetActive(inGame);
            quitButton?.gameObject.SetActive(inGame);

            ApplyContinueButtonLayout(inGame);
        }

        private void ApplyContinueButtonLayout(bool inGame)
        {
            if (!_hasContinueButtonDefaultPosition || _continueButtonRect == null)
            {
                return;
            }

            _continueButtonRect.anchoredPosition = inGame
                ? _continueButtonDefaultPosition
                : new Vector2(0f, _continueButtonDefaultPosition.y);
        }

        private void BackToGame()
        {
            if (_owner == null)
            {
                return;
            }

            if (_owner.IsInGameContext)
            {
                _owner.Close();
            }
            else
            {
                _owner.Back();
            }
        }

        private void BackToMain()
        {
            _owner?.CloseToMainMenu();
        }

        private static void QuitApp()
        {
            Application.Quit();
        }
    }

    [Serializable]
    public struct UIFormOption
    {
        public string prop;
        public string label;
    }
}