using UnityEngine;
using UnityEngine.UIElements;
using OnlyScove.Scripts;

namespace UI
{
    public class SettingsController : MonoBehaviour
    {
        private UIDocument _doc;
        private CameraController _cameraController;

        // Tabs Content
        private VisualElement _contentGeneral, _contentGraphics, _contentAudio;
        private Button _tabGeneral, _tabGraphics, _tabAudio, _tabControls;

        private void OnEnable()
        {
            _doc = GetComponent<UIDocument>();
            _cameraController = Object.FindFirstObjectByType<CameraController>();

            var root = _doc.rootVisualElement;

            // Query Tabs
            _tabGeneral = root.Q<Button>("tab-general");
            _tabGraphics = root.Q<Button>("tab-graphics");
            _tabAudio = root.Q<Button>("tab-audio");
            _tabControls = root.Q<Button>("tab-controls");

            // Query Content
            _contentGeneral = root.Q<VisualElement>("content-general");
            _contentGraphics = root.Q<VisualElement>("content-graphics");
            _contentAudio = root.Q<VisualElement>("content-audio");

            // Events
            _tabGeneral.clicked += () => SwitchTab(_contentGeneral, _tabGeneral);
            _tabGraphics.clicked += () => SwitchTab(_contentGraphics, _tabGraphics);
            _tabAudio.clicked += () => SwitchTab(_contentAudio, _tabAudio);

            root.Q<Button>("btn-back").clicked += () => UIManager.Instance.ToggleSettings();

            // Camera Binding (FOV)
            var fovSlider = root.Q<Slider>("setting-fov");
            if (fovSlider != null)
            {
                if (SettingsManager.Instance != null) fovSlider.value = SettingsManager.Instance.Settings.fieldOfView;
                fovSlider.RegisterValueChangedCallback(evt => {
                    if (SettingsManager.Instance != null) SettingsManager.Instance.Settings.fieldOfView = evt.newValue;
                    if (_cameraController != null) _cameraController.SetFOV(evt.newValue);
                });
            }

            // Sensitivity Binding
            var sensSlider = root.Q<Slider>("setting-sensitivity");
            if (sensSlider != null)
            {
                if (SettingsManager.Instance != null) sensSlider.value = SettingsManager.Instance.Settings.sensitivity;
                sensSlider.RegisterValueChangedCallback(evt => {
                    if (SettingsManager.Instance != null) SettingsManager.Instance.SetSensitivity(evt.newValue);
                });
            }

            // Invert X Binding
            var invertXToggle = root.Q<Toggle>("setting-invert-x");
            if (invertXToggle != null)
            {
                if (SettingsManager.Instance != null) invertXToggle.value = SettingsManager.Instance.Settings.invertX;
                invertXToggle.RegisterValueChangedCallback(evt => {
                    if (SettingsManager.Instance != null) SettingsManager.Instance.SetInvertX(evt.newValue);
                });
            }

            // Invert Y Binding
            var invertYToggle = root.Q<Toggle>("setting-invert-y");
            if (invertYToggle != null)
            {
                if (SettingsManager.Instance != null) invertYToggle.value = SettingsManager.Instance.Settings.invertY;
                invertYToggle.RegisterValueChangedCallback(evt => {
                    if (SettingsManager.Instance != null) SettingsManager.Instance.SetInvertY(evt.newValue);
                });
            }

            // Side Bias Binding
            var sideDropdown = root.Q<DropdownField>("setting-camera-side");
            if (sideDropdown != null)
            {
                if (SettingsManager.Instance != null) sideDropdown.index = SettingsManager.Instance.Settings.sideBiasRight ? 0 : 1;
                sideDropdown.RegisterValueChangedCallback(evt => {
                    if (SettingsManager.Instance != null) SettingsManager.Instance.SetSideBias(evt.newValue == "Right");
                });
            }

            // Language Binding
            var langDropdown = root.Q<DropdownField>("setting-language");
            if (langDropdown != null)
            {
                langDropdown.RegisterValueChangedCallback(evt => {
                    string code = evt.newValue == "English" ? "en" : "vi";
                    LocalizationManager.Instance.LoadLanguage(code);
                });
            }

            // Lắng nghe sự kiện đổi ngôn ngữ để cập nhật Text
            if (LocalizationManager.Instance != null)
            {
                LocalizationManager.Instance.OnLanguageChanged += UpdateTexts;
                UpdateTexts();
            }
            else
            {
                Debug.LogWarning("[SettingsController] LocalizationManager Instance not found in scene!");
            }
        }

        private void SwitchTab(VisualElement targetContent, Button targetTab)
        {
            if (targetContent == null || targetTab == null) return;

            // Ẩn tất cả (Thêm null check)
            if (_contentGeneral != null) _contentGeneral.style.display = DisplayStyle.None;
            if (_contentGraphics != null) _contentGraphics.style.display = DisplayStyle.None;
            if (_contentAudio != null) _contentAudio.style.display = DisplayStyle.None;

            if (_tabGeneral != null) _tabGeneral.RemoveFromClassList("active-tab");
            if (_tabGraphics != null) _tabGraphics.RemoveFromClassList("active-tab");
            if (_tabAudio != null) _tabAudio.RemoveFromClassList("active-tab");

            // Hiện cái được chọn
            targetContent.style.display = DisplayStyle.Flex;
            targetTab.AddToClassList("active-tab");
        }

        private void UpdateTexts()
        {
            if (LocalizationManager.Instance == null) return;
            
            var root = _doc.rootVisualElement;
            
            // Dùng null-conditional operator (?.) để cực kỳ an toàn
            var titleLabel = root.Q<Label>("title");
            if (titleLabel != null) titleLabel.text = LocalizationManager.Instance.Get("settings_title");
            
            if (_tabGeneral != null) _tabGeneral.text = LocalizationManager.Instance.Get("settings_general");
            if (_tabGraphics != null) _tabGraphics.text = LocalizationManager.Instance.Get("settings_graphics");
            if (_tabAudio != null) _tabAudio.text = LocalizationManager.Instance.Get("settings_audio");
            if (_tabControls != null) _tabControls.text = LocalizationManager.Instance.Get("settings_controls");
            
            var btnBack = root.Q<Button>("btn-back");
            if (btnBack != null) btnBack.text = LocalizationManager.Instance.Get("settings_back");
        }
    }
}