using Prism.DryIoc;
using Prism.Ioc;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text.Json;
using System.Windows;
using System.Windows.Media;
using TeamAAS.Camera.Interfaces;
using TeamAAS.Robot.Interfaces;
using TeamAAS.Robot;
using TeamAAS.Dialogs;
using TeamAAS.ViewModels;
using TeamAAS.Views;
using TeamAAS.FlowEngine;
using TeamAAS.FlowEditor.Execution;
using TeamAAS.FlowEngine.Interfaces;
using TeamAAS.FlowEngine.Execution;
using System.Diagnostics;
using TeamAAS.Communication;
using TeamAAS.Camera;
using TeamAAS.Core;
using TeamAAS.Feeder.Interfaces;
using TeamAAS.Feeder;
using TeamAAS.Motion;
using TeamAAS.Models;
using TeamAAS.Localization;
using TeamAAS.Theme;
using PropertyGridLib.Localization;

namespace TeamAAS
{
    public partial class App : PrismApplication
    {
        public static SystemConfiguration SystemConfig { get; set; } = new SystemConfiguration();

        /// <summary>
        /// Runtime 根目录（业务依赖、Plugins、native 库统一存放于此）。
        /// 根目录只保留 EXE + 配置类文件夹（Config/Logs/Products/Recipe/zh-CN）。
        /// </summary>
        public static string RuntimeDir => PathHelper.RuntimeDir;

        protected override Window CreateShell()
        {
            return Container.Resolve<MainWindow>();
        }

        protected override void OnStartup(StartupEventArgs e)
        {
            // 1) 把 native DLL 搜索路径指向 Runtime\dll\x64（OpenCV 等非 .NET 库）
            SetupNativeDllSearchPath();

            // 2) 注册 AssemblyResolve：在 Runtime 下递归查找缺失程序集，重复 DLL 直接跳过
            AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

            // 3) 加载插件（Plugins 现在位于 Runtime\Plugins）
            string pluginsPath = PathHelper.PluginsDir;
            PluginLoader.Instance.LoadFrom(pluginsPath);

            // 4) 加载系统配置（字体/标题/主题/主色）
            LoadSystemConfig();

            // 5) 初始化多语言系统
            InitializeLocalization();

            // 6) 初始化全局变量管理器（加载机器级 Global 固定变量）
            GlobalVariableManager.Instance.LoadGlobalScoped();

            // 7) 初始化 ResultRegistry（订阅全局变量变化）
            ResultRegistry.Initialize();

            // 7.1) 探测可用视觉引擎（反射扫描 + 尝试加载已知引擎类库），
            //      并按配置设置当前引擎（Vision.EngineName）——主页画面/标定页随引擎切换
            TeamAAS.Vision.VisualEngineManager.Instance.Discover();
            TeamAAS.Vision.VisualEngineManager.Instance.SetCurrent(SystemConfig?.Vision?.EngineName);

            // 8) 全局窗口自适应：所有 Window（主窗/子窗体/对话框/弹窗）Loaded 后自动挂 UiScaler，
            //    以后新增任何窗体都无需手动接线
            EventManager.RegisterClassHandler(typeof(Window), FrameworkElement.LoadedEvent,
                new RoutedEventHandler(OnAnyWindowLoaded), true);

            // 9) 全局异常兑底：任何未处理异常先落主页日志（含堆栈），UI 线程异常标记已处理避免闪退；
            //    进程级/任务级异常虽救不回来，但至少留下死因可查。触发场景如：VM 控件污染
            //    应用级画刷资源导致 HC 样式 String→Brush 强转失败（详见 Plugins.Vm/VmThemeGuard）
            DispatcherUnhandledException += (s, args) =>
            {
                AppLogger.Error("UI 线程未处理异常: " + args.Exception.Message, args.Exception, nameof(App));

                args.Handled = true;
            };
            AppDomain.CurrentDomain.UnhandledException += (s, args) =>
                AppLogger.Error("致命未处理异常(进程即将退出): " + args.ExceptionObject, args.ExceptionObject as Exception, nameof(App));
            System.Threading.Tasks.TaskScheduler.UnobservedTaskException += (s, args) =>
            {
                AppLogger.Error("未观察的任务异常: " + args.Exception.Message, args.Exception, nameof(App));
                args.SetObserved();
            };

            base.OnStartup(e);
        }

        /// <summary>
        /// 全局窗口 Loaded 钩子：主窗口计算全局缩放因子，弹窗/子窗体跟随。
        /// （UiScaler.Attach 内部有幂等保护，重复触发不会重复挂接。）
        /// </summary>
        private static void OnAnyWindowLoaded(object sender, RoutedEventArgs e)
        {
            if (!(sender is Window window)) return;

            if (Application.Current.MainWindow == window)
                UiScaler.AttachMain(window);
            else
                UiScaler.Attach(window);
        }

        /// <summary>
        /// 把 Runtime\dll\<arch> 加入 native DLL 搜索路径（P/Invoke、DllImport 用）。
        /// 通过 SetDllDirectory 让 LoadLibrary 在该目录查找 native 库。
        /// 架构按当前进程位数自动选择 x86 / x64，兼容 32 位与 64 位部署。
        /// </summary>
        private static void SetupNativeDllSearchPath()
        {
            try
            {
                string arch = IntPtr.Size == 8 ? "x64" : "x86";
                string nativeDir = Path.Combine(RuntimeDir, "dll", arch);
                if (Directory.Exists(nativeDir))
                {
                    SetDllDirectory(nativeDir);
                }
            }
            catch { /* 失败不影响启动，缺失 native 库时由调用方报错 */ }
        }

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern bool SetDllDirectory(string lpPathName);

        private static readonly Dictionary<string, Assembly> _resolvedCache =
            new Dictionary<string, Assembly>(StringComparer.OrdinalIgnoreCase);

        /// <summary>
        /// 在 Runtime 目录下递归查找缺失程序集；同名 DLL 已加载过则直接返回缓存，跳过重复加载避免报错。
        /// 同时兼容旧的 EXE 根目录布局（迁移期内根目录残留 DLL 也能找到）。
        /// </summary>
        private Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs e)
        {
            try
            {
                string name = new AssemblyName(e.Name).Name;
                if (string.IsNullOrEmpty(name)) return null;

                // 1) 已加载过 → 直接返回（跳过重复，避免重复加载报错
                if (_resolvedCache.TryGetValue(name, out var cached))
                    return cached;

                // 2) Runtime 目录递归查找（包含 Plugins 子目录、dll 子目录等）
                var found = TryFindAssembly(RuntimeDir, name);
                if (found != null)
                {
                    _resolvedCache[name] = found;
                    return found;
                }

                // 3) 兼容：根目录残留 DLL 也能找到（迁移期间用）
                var rootPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, name + ".dll");
                if (File.Exists(rootPath))
                {
                    var asm = Assembly.LoadFrom(rootPath);
                    _resolvedCache[name] = asm;
                    return asm;
                }
            }
            catch { }
            return null;
        }

        /// <summary>
        /// 在指定根目录下递归查找匹配名称的 .dll，找到第一个即返回。
        /// 多个位置存在同名 DLL 时优先返回 Plugins 子目录的版本（避免插件重复依赖冲突）。
        /// </summary>
        private static Assembly TryFindAssembly(string rootDir, string name)
        {
            if (!Directory.Exists(rootDir)) return null;

            string target = name + ".dll";
            string firstHit = null;

            // 优先 Plugins 子目录（插件依赖隔离）
            var pluginsSub = Path.Combine(rootDir, "Plugins");
            if (Directory.Exists(pluginsSub))
            {
                var p = Path.Combine(pluginsSub, target);
                if (File.Exists(p)) firstHit = p;
            }

            // 再扫描 Runtime 全部子目录（深度优先）
            if (firstHit == null)
            {
                foreach (var file in Directory.EnumerateFiles(rootDir, target, SearchOption.AllDirectories))
                {
                    firstHit = file;
                    break;
                }
            }

            if (firstHit == null) return null;
            try { return Assembly.LoadFrom(firstHit); }
            catch { return null; }
        }

        protected override void OnInitialized()
        {
            // 运行引擎接线：注入通讯管理器 + 启动心跳监听（触发运行产品执行）
            FlowRunner.Instance.Communication = CoreManager.Communication;
            FlowRunner.Instance.StartHeartbeat();

            base.OnInitialized();
        }

        protected override void OnExit(ExitEventArgs e)
        {
            // 退出前把所有相机停止采集并断开，避免设备句柄残留导致下次打不开
            try { CameraManager.Instance.CloseAll(); } catch { }
            try { MotionManager.Instance.CloseAll(); } catch { }

            base.OnExit(e);
        }

        private static void LoadSystemConfig()
        {
            try
            {
                var path = PathHelper.SystemConfigurationFile;
                if (File.Exists(path))
                {
                    var json = File.ReadAllText(path);
                    SystemConfig = JsonSerializer.Deserialize<SystemConfiguration>(json) ?? new SystemConfiguration();
                }
            }
            catch { SystemConfig = new SystemConfiguration(); }

            // 应用插件日志配置（根目录/路径公式/默认等级）
            TeamAAS.Logging.PluginLogger.Configure(SystemConfig.PluginLog);

            UpdateFontResources();
            ApplyTheme();
        }

        /// <summary>
        /// 初始化多语言系统
        /// </summary>
        private static void InitializeLocalization()
        {
            try
            {
                // 1. 加载所有语言包（.json 人类可读格式）
                //    PostBuild 会把根目录的 Localization 移到 Runtime\Localization，两个路径都兼容
                var localizationPath = PathHelper.ResolveLocalizationDir();
                GlobalLocalizationManager.Instance.LoadLanguagePacks(localizationPath);

                // 2. 设置回退语言为中文（当前语言=回退语言时，直接显示中文原文）
                GlobalLocalizationManager.Instance.FallbackLanguage = "zh-CN";

                // 3. 注入 PropertyGrid 全局翻译钩子：把 [DisplayName]/[Description]/[Category]
                //    特性里的中文原文交给 GlobalLocalizationManager 查语言包翻译（插件零改动）
                LocalizationManager.TextResolver = text => GlobalLocalizationManager.Instance.Translate(text);

                // 4. 从系统配置加载上次保存的语言
                var savedLanguage = SystemConfig?.Language ?? "zh-CN";
                GlobalLocalizationManager.Instance.CurrentLanguage = savedLanguage;

                // 5. 同步 PropertyGrid 语言（culture 开集，直接用语言代码）
                SyncPropertyGridLanguage();

                // 6. 监听语言切换事件（设置页切换语言后，PropertyGrid 实时刷新）
                GlobalLocalizationManager.Instance.LanguageChanged += (s, e) =>
                {
                    SyncPropertyGridLanguage();
                };

                Console.WriteLine($"[Localization] 多语言系统已初始化，当前语言: {savedLanguage}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"[Localization] 初始化失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 同步 PropertyGrid 语言设置（culture 开集，直接使用语言代码，如 "en-US"、"ja-JP"）
        /// </summary>
        private static void SyncPropertyGridLanguage()
        {
            var currentLang = GlobalLocalizationManager.Instance.CurrentLanguage;
            LocalizationManager.CurrentCulture = currentLang;
        }

        public static void UpdateFontResources()
        {
            var font = SystemConfig?.Font ?? new FontSizeSettings();
            var resources = Application.Current?.Resources;
            if (resources == null) return;

            resources["NavButtonFontSize"] = font.NavButtonFont;
            resources["NavButtonWidth"] = font.NavButtonWidth;
            resources["NavButtonHeight"] = font.NavButtonHeight;
            resources["NavIconSize"] = font.NavIconSize;
            resources["TopBarHeight"] = font.TopBarHeight;
            resources["CenterTitleFontSize"] = font.CenterTitleFont;
            resources["ThemeIconFontSize"] = font.ThemeIconSize;
            resources["StatusBarHeight"] = font.StatusBarHeight;
            resources["StatusBarFontSize"] = font.StatusBarFont;
            var title = SystemConfig?.Title ?? "TeamAAS";
            resources["CenterTitleText"] = title;

            if (Application.Current.MainWindow != null)
                Application.Current.MainWindow.Title = title;
        }

        // ────────────────────────────────────────────────────────────────────
        // 主题与主色已下沉到 TeamAAS.Core\TeamAAS.Global\Theme（命名空间 TeamAAS.Theme）：
        //   ThemeManager（门面：ApplyTheme/UpdateTheme/UpdateAccent/RepairTheme）
        //   + VmResourceGuard（资源守护）+ ThemeOverlay（覆盖字典/主色派生）+ ColorUtility。
        // 主程序只调用门面接口，不感知实现细节——保持主程序简洁。
        // ────────────────────────────────────────────────────────────────────

        /// <summary>
        /// 按 SystemConfiguration 完整应用（启动/设置页保存时调用）：
        /// 读取配置后转发给 TeamAAS.Theme.ThemeManager。
        /// </summary>
        public static void ApplyTheme()
        {
            var cfg = SystemConfig ?? new SystemConfiguration();

            bool dark = string.Equals(cfg.Theme, "Dark", StringComparison.OrdinalIgnoreCase);
            AppLogger.Info($"ApplyTheme: dark={dark}, accent={cfg.AccentColor}", nameof(App));

            ThemeManager.ApplyTheme(dark, cfg.AccentColor);
        }

        /// <summary>
        /// 保存系统配置到 Config\SystemConfiguration.json（主题/主色/字体/标题）。
        /// </summary>
        public static void SaveSystemConfig()
        {
            try
            {
                var path = PathHelper.SystemConfigurationFile;
                var json = JsonSerializer.Serialize(SystemConfig, new JsonSerializerOptions { WriteIndented = true });
                File.WriteAllText(path, json);
                // 保存后立即应用插件日志配置
                TeamAAS.Logging.PluginLogger.Configure(SystemConfig.PluginLog);
            }
            catch (Exception ex)
            {
                AppLogger.Error("系统配置保存失败", ex, nameof(App));
            }
        }

        protected override void RegisterTypes(IContainerRegistry containerRegistry)
        {
            containerRegistry.RegisterSingleton<MainWindowViewModel>();

            // 注册设备管理器并加载配置（相机/机器人/通讯/供料器）
            // CameraManager 使用懒汉单例，DI 容器直接复用单例实例
            containerRegistry.RegisterInstance<ICameraManager>(CameraManager.Instance);
            containerRegistry.RegisterInstance<IRobotManager>(RobotManager.Instance);
            containerRegistry.RegisterInstance<CommunicationManager>(CommunicationManager.Instance);
            containerRegistry.RegisterInstance<IFeederManager>(FeederManager.Instance);
            containerRegistry.RegisterInstance<IPluginLoader>(PluginLoader.Instance);
            containerRegistry.RegisterInstance<MotionManager>(MotionManager.Instance);


            var commManager = CommunicationManager.Instance;
            commManager.LoadConfig();

            var cameraManager = CameraManager.Instance;
            cameraManager.LoadConfig();

            var robotManager = RobotManager.Instance;
            robotManager.LoadConfig();

            var feederManager = FeederManager.Instance;
            feederManager.LoadConfig();

            // 运动控制设备（设备内核新增）：加载 Config\MotionDevices.json，无配置文件时为空列表
            var motionManager = MotionManager.Instance;
            motionManager.LoadConfig();

            // 将 DI 单例赋值给 CoreManager，确保全局同一实例
            CoreManager.Camera = cameraManager;
            CoreManager.Robot = robotManager;
            CoreManager.Communication = commManager;
            CoreManager.Feeder = feederManager;
            CoreManager.Motion = motionManager;

            // SDK 服务注册表接线：把同一批单例注册进 ServiceRegistry（适配器，零行为变化）。
            // 具体类型 + 接口双注册：CoreManager 门面按具体类型取，插件按接口经 IPluginContext 取。
            var sdkRegistry = TeamAAS.Global.ServiceRegistry.Default;
            sdkRegistry.Register(cameraManager);
            sdkRegistry.Register<ICameraManager>(cameraManager);
            sdkRegistry.Register(robotManager);
            sdkRegistry.Register<IRobotManager>(robotManager);
            sdkRegistry.Register(commManager);
            sdkRegistry.Register(feederManager);
            sdkRegistry.Register<IFeederManager>(feederManager);
            sdkRegistry.Register(motionManager);

            containerRegistry.RegisterSingleton<SettingViewModel>();

            containerRegistry.RegisterForNavigation<HomeView>("HomeView");
            containerRegistry.RegisterForNavigation<ProductView>("ProductView");
            containerRegistry.RegisterForNavigation<SettingView>("SettingView");
            containerRegistry.RegisterForNavigation<CalibrationView>("CalibrationView");
            containerRegistry.RegisterForNavigation<StatisticsView>("StatisticsView");
            containerRegistry.RegisterForNavigation<UserView>("UserView");
        }
    }
}