using TMPro;
using UnityEngine;
using UnityEngine.UI;
using BaseGames.Core;
using BaseGames.Localization;

namespace BaseGames.UI
{
    /// <summary>
    /// 设置面板控制器（架构 10_UIModule §7）。
    /// 驱动 SettingsManager 的音量与画面设置，并从当前配置初始化控件值。
    /// 生命周期 / 焦点由 <see cref="UIPanelBase"/> 统一处理。
    /// </summary>
    public class SettingsPanelController : UIPanelBase
    {
        // ISettingsService 通过 ServiceLocator 获取，无需 Inspector 直接注入具体类，
        // 支持测试场景替换 Mock 实现。
        private ISettingsService _settings;

        [Header("音量滑条")]
        [SerializeField] private Slider _masterVolume;
        [SerializeField] private Slider _bgmVolume;
        [SerializeField] private Slider _sfxVolume;
        [SerializeField] private Slider _ambientVolume;

        [Header("画面")]
        [SerializeField] private Toggle      _vSyncToggle;
        [SerializeField] private TMP_Dropdown _fpsDropdown;    // 30 / 60 / 120 / 无限

        [Header("可访问性")]
        [SerializeField] private Slider       _uiScaleSlider;       // 0.8 ~ 1.5
        [SerializeField] private TMP_Text     _uiScaleValueText;    // 实时显示 "100%"
        [SerializeField] private TMP_Dropdown _colorblindDropdown;  // None / Prot / Deut / Trit
        [SerializeField] private Toggle       _screenShakeToggle;

        [Header("语言")]
        [SerializeField] private TMP_Dropdown _languageDropdown;  // 中文 / English / 日本語 / 한국어

        [Header("按键重绑定")]
        [SerializeField] private GameObject _rebindPanelRoot;  // RebindPanel GameObject

        private static readonly int[] FpsOptions = { 30, 60, 120, -1 };

        // 语言下拉项顺序（与脚手架填充的显示项一一对应）
        private static readonly Language[] LanguageOptions =
            { Language.ChineseSimplified, Language.English, Language.Japanese, Language.Korean };

        protected override void OnPanelOpen()
        {
            _settings = ServiceLocator.GetOrDefault<ISettingsService>();
            if (_settings == null) return;
            var data = _settings.Current;

            // 初始化控件值（先移除监听再设置值再添加，防止面板重开时重复注册）
            InitSlider(_masterVolume, data.MasterVolume,  v => _settings.SetMasterVolume(v));
            InitSlider(_bgmVolume,    data.BGMVolume,     v => _settings.SetBGMVolume(v));
            InitSlider(_sfxVolume,    data.SFXVolume,     v => _settings.SetSFXVolume(v));
            InitSlider(_ambientVolume,data.AmbientVolume, v => _settings.SetAmbientVolume(v));

            if (_vSyncToggle != null)
            {
                _vSyncToggle.onValueChanged.RemoveAllListeners();
                _vSyncToggle.isOn = data.VSync;
                _vSyncToggle.onValueChanged.AddListener(v => _settings.SetVSync(v));
            }

            if (_fpsDropdown != null)
            {
                _fpsDropdown.onValueChanged.RemoveAllListeners();
                int idx = System.Array.IndexOf(FpsOptions, data.TargetFPS);
                _fpsDropdown.value = idx >= 0 ? idx : 1; // default 60
                _fpsDropdown.onValueChanged.AddListener(i =>
                    _settings.SetTargetFrameRate(FpsOptions[Mathf.Clamp(i, 0, FpsOptions.Length - 1)]));
            }

            // ── 可访问性 ──────────────────────────────────────────────────────
            if (_uiScaleSlider != null)
            {
                _uiScaleSlider.onValueChanged.RemoveAllListeners();
                _uiScaleSlider.minValue = 0.8f;
                _uiScaleSlider.maxValue = 1.5f;
                _uiScaleSlider.value    = Mathf.Clamp(data.UIScale, _uiScaleSlider.minValue, _uiScaleSlider.maxValue);
                UpdateUIScaleLabel(_uiScaleSlider.value);
                _uiScaleSlider.onValueChanged.AddListener(v =>
                {
                    _settings.SetUIScale(v);
                    UpdateUIScaleLabel(v);
                });
            }

            if (_colorblindDropdown != null)
            {
                _colorblindDropdown.onValueChanged.RemoveAllListeners();
                _colorblindDropdown.value = (int)data.ColorblindMode;
                _colorblindDropdown.onValueChanged.AddListener(i =>
                    _settings.SetColorblindMode((ColorblindMode)Mathf.Clamp(i, 0, 3)));
            }

            if (_screenShakeToggle != null)
            {
                _screenShakeToggle.onValueChanged.RemoveAllListeners();
                _screenShakeToggle.isOn = data.ScreenShakeEnabled;
                _screenShakeToggle.onValueChanged.AddListener(v => _settings.SetScreenShakeEnabled(v));
            }

            // ── 语言 ──────────────────────────────────────────────────────────
            if (_languageDropdown != null)
            {
                _languageDropdown.onValueChanged.RemoveAllListeners();
                var loc = ServiceLocator.GetOrDefault<ILocalizationService>();
                int idx = loc != null ? System.Array.IndexOf(LanguageOptions, loc.CurrentLanguage) : 0;
                _languageDropdown.value = idx >= 0 ? idx : 0;
                _languageDropdown.RefreshShownValue();
                _languageDropdown.onValueChanged.AddListener(i =>
                    ServiceLocator.GetOrDefault<ILocalizationService>()?
                        .SetLanguage(LanguageOptions[Mathf.Clamp(i, 0, LanguageOptions.Length - 1)]));
            }
        }

        private void UpdateUIScaleLabel(float v)
        {
            if (_uiScaleValueText != null)
                _uiScaleValueText.text = Mathf.RoundToInt(v * 100f) + "%";
        }

        // ── 辅助 ──────────────────────────────────────────────────────────────

        private static void InitSlider(Slider slider, float value, UnityEngine.Events.UnityAction<float> onChange)
        {
            if (slider == null) return;
            slider.onValueChanged.RemoveAllListeners();
            slider.value = value;
            slider.onValueChanged.AddListener(onChange);
        }

        // ── 焦点 ──────────────────────────────────────────────────────────────

        /// <summary>默认焦点 / 焦点恢复回到主音量滑条（基类 FocusFirst 调用）。</summary>
        protected override GameObject ResolveFirstSelected()
            => _masterVolume != null ? _masterVolume.gameObject : null;
    }
}