using System.Windows;
using System.Windows.Forms;
using Microsoft.Win32;
using AxCopilot.Core;
using AxCopilot.Handlers;
using AxCopilot.Services;
using AxCopilot.Services.Agent;
using AxCopilot.ViewModels;
using AxCopilot.Views;

namespace AxCopilot;

public partial class App : System.Windows.Application
{
    private System.Threading.Mutex?   _singleInstanceMutex;
    private InputListener?            _inputListener;
    private LauncherWindow?           _launcher;
    private NotifyIcon?               _trayIcon;
    private Views.TrayMenuWindow?     _trayMenu;
    private SettingsService?          _settings;
    private SettingsWindow?           _settingsWindow;
    private PluginHost?               _pluginHost;
    private ClipboardHistoryService?  _clipboardHistory;
    private DockBarWindow?            _dockBar;
    private FileDialogWatcher?        _fileDialogWatcher;
    private volatile IndexService?    _indexService;
    public  IndexService?             IndexService    => _indexService;
    public  SettingsService?          SettingsService => _settings;
    public  ClipboardHistoryService? ClipboardHistoryService => _clipboardHistory;
    private SessionTrackingService?   _sessionTracking;
    private WorktimeReminderService?  _worktimeReminder;
    private ScreenCaptureHandler?     _captureHandler;
    private AgentMemoryService?       _memoryService;
    public  AgentMemoryService?       MemoryService => _memoryService;
    private LlmService?               _sharedLlm;
    private PluginInstallService?     _pluginInstallService;

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        // ─── 보안: 디버거/디컴파일러 감지 (Release 빌드만 활성) ───
        Security.AntiTamper.Check();

        // 전역 예외 핸들러 — 미처리 예외 시 로그 + 메시지 (크래시 방지)
        DispatcherUnhandledException += (_, ex) =>
        {
            LogService.Error($"미처리 예외: {ex.Exception}");
            CustomMessageBox.Show(
                $"오류가 발생했습니다:\n{ex.Exception.Message}\n\n로그 폴더를 확인하세요.",
                "AX Copilot 오류", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Error);
            ex.Handled = true;
        };

        // ─── 중복 실행 방지 ──────────────────────────────────────────────────
        _singleInstanceMutex = new System.Threading.Mutex(
            initiallyOwned: true, "Global\\AXCopilot_SingleInstance", out bool createdNew);
        if (!createdNew)
        {
            _singleInstanceMutex.Dispose();
            _singleInstanceMutex = null;
            CustomMessageBox.Show("AX Copilot가 이미 실행 중입니다.\n트레이 아이콘을 확인하세요.",
                "AX Copilot", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Information);
            Shutdown();
            return;
        }

        LogService.Info("=== AX Copilot 시작 ===");

        // ─── 서비스 초기화 ────────────────────────────────────────────────────
        _settings = new SettingsService();
        var settings = _settings;
        settings.Load();

        // Phase L3 공유 서비스
        _sharedLlm           = new LlmService(settings);
        _pluginInstallService = new PluginInstallService();

        // 마이그레이션 알림 (UI가 준비된 후 표시)
        if (settings.MigrationSummary != null)
        {
            Dispatcher.BeginInvoke(() =>
            {
                CustomMessageBox.Show(
                    settings.MigrationSummary,
                    "AX Copilot — 설정 업데이트",
                    System.Windows.MessageBoxButton.OK,
                    System.Windows.MessageBoxImage.Information);
            }, System.Windows.Threading.DispatcherPriority.Loaded);
        }

        // 언어 초기화
        L10n.SetLanguage(settings.Settings.Launcher.Language);

        // 첫 실행 시 자동 시작 등록 (레지스트리에 아직 없으면)
        if (!IsAutoStartEnabled())
            SetAutoStart(true);

        _memoryService = new AgentMemoryService();
        _memoryService.Load(settings.Settings.Llm.WorkFolder);

        _indexService = new IndexService(settings);
        var indexService = _indexService;
        var fuzzyEngine = new FuzzyEngine(indexService);
        var commandResolver = new CommandResolver(fuzzyEngine, settings);
        var contextManager = new ContextManager(settings);

        // ─── 세션 추적 / 사용 통계 ────────────────────────────────────────────
        _sessionTracking = new SessionTrackingService();

        // ─── 잠금 해제 알림 서비스 ────────────────────────────────────────────
        _worktimeReminder = new WorktimeReminderService(settings, Dispatcher);

        // ─── 클립보드 히스토리 서비스 ──────────────────────────────────────────
        _clipboardHistory = new ClipboardHistoryService(settings);

        // ─── 빌트인 핸들러 등록 ──────────────────────────────────────────────
        commandResolver.RegisterHandler(new CalculatorHandler());
        commandResolver.RegisterHandler(new SystemCommandHandler(settings));
        commandResolver.RegisterHandler(new SnippetHandler(settings));
        commandResolver.RegisterHandler(new ClipboardHistoryHandler(_clipboardHistory));
        commandResolver.RegisterHandler(new WorkspaceHandler(contextManager, settings));
        commandResolver.RegisterHandler(new UrlAliasHandler(settings));
        commandResolver.RegisterHandler(new FolderAliasHandler(settings));
        commandResolver.RegisterHandler(new BatchHandler(settings));
        commandResolver.RegisterHandler(new ClipboardHandler(settings));
        commandResolver.RegisterHandler(new BookmarkHandler());
        commandResolver.RegisterHandler(new WebSearchHandler(settings));
        commandResolver.RegisterHandler(new ProcessHandler());
        commandResolver.RegisterHandler(new MediaHandler());
        commandResolver.RegisterHandler(new SystemInfoHandler());
        commandResolver.RegisterHandler(new StarInfoHandler()); // * 단축키 (info와 동일)
        commandResolver.RegisterHandler(new EmojiHandler());
        commandResolver.RegisterHandler(new ColorHandler());
        commandResolver.RegisterHandler(new RecentFilesHandler());
        commandResolver.RegisterHandler(new NoteHandler());
        commandResolver.RegisterHandler(new UninstallHandler());
        commandResolver.RegisterHandler(new PortHandler());
        commandResolver.RegisterHandler(new EnvHandler());
        commandResolver.RegisterHandler(new JsonHandler());
        commandResolver.RegisterHandler(new EncodeHandler());
        commandResolver.RegisterHandler(new SnapHandler());
        _captureHandler = new ScreenCaptureHandler(settings);
        commandResolver.RegisterHandler(_captureHandler);
        commandResolver.RegisterHandler(new ColorPickHandler());
        commandResolver.RegisterHandler(new DateCalcHandler());
        commandResolver.RegisterHandler(new ServiceHandler(_clipboardHistory));
        commandResolver.RegisterHandler(new ClipboardPipeHandler());
        commandResolver.RegisterHandler(new JournalHandler());
        commandResolver.RegisterHandler(new RoutineHandler());
        commandResolver.RegisterHandler(new BatchTextHandler());
        commandResolver.RegisterHandler(new DiffHandler(_clipboardHistory));
        commandResolver.RegisterHandler(new WindowSwitchHandler());
        commandResolver.RegisterHandler(new RunHandler());
        commandResolver.RegisterHandler(new TextStatsHandler());
        commandResolver.RegisterHandler(new FavoriteHandler());
        commandResolver.RegisterHandler(new RenameHandler());
        commandResolver.RegisterHandler(new MonitorHandler());
        commandResolver.RegisterHandler(new ScaffoldHandler());
        commandResolver.RegisterHandler(new EverythingHandler());
        commandResolver.RegisterHandler(new HelpHandler(settings));
        commandResolver.RegisterHandler(new ChatHandler(settings));

        // ─── Phase L3 핸들러 ──────────────────────────────────────────────────
        commandResolver.RegisterHandler(new QuickLinkHandler(settings));
        var snippetTemplateSvc = new SnippetTemplateService(settings, _sharedLlm);
        commandResolver.RegisterHandler(new AiSnippetHandler(settings, snippetTemplateSvc));
        commandResolver.RegisterHandler(new WebSearchSummaryHandler(settings, _sharedLlm));

        // ─── 플러그인 로드 ────────────────────────────────────────────────────
        var pluginHost = new PluginHost(settings, commandResolver);
        pluginHost.LoadAll();
        _pluginHost = pluginHost;

        // ─── 런처 윈도우 ──────────────────────────────────────────────────────
        var vm = new LauncherViewModel(commandResolver, settings);
        _launcher = new LauncherWindow(vm)
        {
            OpenSettingsAction = OpenSettings
        };

        // ─── 클립보드 히스토리 초기화 (메시지 펌프 시작 직후 — 런처 표시 불필요) ──
        Dispatcher.BeginInvoke(
            () => _clipboardHistory?.Initialize(),
            System.Windows.Threading.DispatcherPriority.ApplicationIdle);

        // ─── ChatWindow 미리 생성 (앱 유휴 시점에 숨겨진 채로 초기화) ──────────
        // 이후 OpenAiChat() 시 창 생성 비용 없이 즉시 열림
        Dispatcher.BeginInvoke(
            () => PrewarmChatWindow(),
            System.Windows.Threading.DispatcherPriority.SystemIdle);

        // ─── 인덱스 빌드 (백그라운드) + 완료 후 FileSystemWatcher 시작 ────────
        _ = indexService.BuildAsync().ContinueWith(_ => indexService.StartWatchers());

        // ─── 글로벌 훅 + 스니펫 확장기 ───────────────────────────────────────
        _inputListener = new InputListener();
        _inputListener.HotkeyTriggered += OnHotkeyTriggered;
        _inputListener.CaptureHotkeyTriggered += OnCaptureHotkeyTriggered;
        _inputListener.HookFailed += OnHookFailed;

        // 설정에 저장된 핫키로 초기화 (기본: Alt+Space)
        _inputListener.UpdateHotkey(settings.Settings.Hotkey);

        // 글로벌 캡처 단축키 초기화
        _inputListener.UpdateCaptureHotkey(
            settings.Settings.ScreenCapture.GlobalHotkey,
            settings.Settings.ScreenCapture.GlobalHotkeyEnabled);

        var snippetExpander = new SnippetExpander(settings);
        _inputListener.KeyFilter = snippetExpander.HandleKey;

        _inputListener.Start();

        // ─── 시스템 트레이 ─────────────────────────────────────────────────────
        SetupTrayIcon(pluginHost, settings);

        // ─── 파일 대화상자 감지 ──────────────────────────────────────────────
        _fileDialogWatcher = new FileDialogWatcher();
        _fileDialogWatcher.FileDialogOpened += (_, hwnd) =>
        {
            Dispatcher.Invoke(() =>
            {
                if (_launcher == null || _launcher.IsVisible) return;
                if (_settings?.Settings.Launcher.EnableFileDialogIntegration != true) return;
                WindowTracker.Capture();
                _launcher.Show();
                Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Input,
                    () => _launcher.SetInputText("cd "));
            });
        };
        _fileDialogWatcher.Start();

        // 독 바 자동 표시
        if (settings.Settings.Launcher.DockBarAutoShow)
            Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Loaded, () => ToggleDockBar());

        LogService.Info($"초기화 완료. {settings.Settings.Hotkey}로 실행하세요.");
    }

    private void OnHotkeyTriggered(object? sender, EventArgs e)
    {
        // 런처가 열리기 전 현재 활성 창을 저장 (SnapHandler, ScreenCaptureHandler용)
        WindowTracker.Capture();

        // 선택 텍스트 감지는 UI 스레드 밖에서 수행해야 SendInput이 정상 처리됨
        var launcherSettings = _settings?.Settings.Launcher;
        var enableTextAction = launcherSettings?.EnableTextAction == true;

        // ── 런처 토글(닫기)은 텍스트 감지 없이 즉시 처리 ──
        bool isVisible = false;
        Dispatcher.Invoke(() => { isVisible = _launcher?.IsVisible == true; });
        if (isVisible)
        {
            Dispatcher.Invoke(() => _launcher?.Hide());
            return;
        }

        // ── 텍스트 감지가 비활성이면 즉시 런처 표시 ──
        if (!enableTextAction)
        {
            Dispatcher.Invoke(() =>
            {
                if (_launcher == null) return;
                UsageStatisticsService.RecordLauncherOpen();
                _launcher.Show();
            });
            return;
        }

        // ── 텍스트 감지 활성: 런처를 먼저 열고, 텍스트 감지를 비동기로 처리 ──
        string? selectedText = TryGetSelectedText();

        Dispatcher.Invoke(() =>
        {
            if (_launcher == null) return;

            if (!string.IsNullOrWhiteSpace(selectedText))
            {
                var enabledCmds = launcherSettings?.TextActionCommands ?? new();

                // 활성 명령이 1개뿐이면 팝업 없이 바로 실행
                if (enabledCmds.Count == 1)
                {
                    var directAction = TextActionPopup.AvailableCommands
                        .FirstOrDefault(c => c.Key == enabledCmds[0]);
                    if (!string.IsNullOrEmpty(directAction.Key))
                    {
                        var actionResult = enabledCmds[0] switch
                        {
                            "translate" => TextActionPopup.ActionResult.Translate,
                            "summarize" => TextActionPopup.ActionResult.Summarize,
                            "grammar"   => TextActionPopup.ActionResult.GrammarFix,
                            "explain"   => TextActionPopup.ActionResult.Explain,
                            "rewrite"   => TextActionPopup.ActionResult.Rewrite,
                            _           => TextActionPopup.ActionResult.None,
                        };
                        if (actionResult != TextActionPopup.ActionResult.None)
                        {
                            ExecuteTextAction(actionResult, selectedText);
                            return;
                        }
                    }
                }

                // 여러 개 → 팝업 표시
                var popup = new TextActionPopup(selectedText, enabledCmds);
                popup.Closed += (_, _) =>
                {
                    switch (popup.SelectedAction)
                    {
                        case TextActionPopup.ActionResult.OpenLauncher:
                            UsageStatisticsService.RecordLauncherOpen();
                            _launcher.Show();
                            break;
                        case TextActionPopup.ActionResult.None:
                            break; // Esc 또는 포커스 잃음
                        default:
                            // AI 명령 실행 → AX Agent 대화로 전달
                            ExecuteTextAction(popup.SelectedAction, popup.SelectedText);
                            break;
                    }
                };
                popup.Show();
            }
            else
            {
                UsageStatisticsService.RecordLauncherOpen();
                _launcher.Show();
            }
        });
    }

    /// <summary>현재 선택된 텍스트를 가져옵니다 (Ctrl+C 시뮬레이션).</summary>
    /// <remarks>후크 스레드에서 호출됩니다 (UI 스레드 아님). 클립보드 접근은 STA 스레드가 필요합니다.</remarks>
    private string? TryGetSelectedText()
    {
        try
        {
            // 클립보드는 STA 스레드에서만 접근 가능 → Dispatcher로 읽기
            string? prevText = null;
            bool hadText = false;
            Dispatcher.Invoke(() =>
            {
                hadText = System.Windows.Clipboard.ContainsText();
                prevText = hadText ? System.Windows.Clipboard.GetText() : null;
                System.Windows.Clipboard.Clear();
            });

            System.Threading.Thread.Sleep(30);

            // Ctrl+C 시뮬레이션 (후크 스레드에서 → 대상 앱이 처리)
            var inputs = new[]
            {
                new NativeMethods.INPUT { type = 1, u = new NativeMethods.InputUnion { ki = new NativeMethods.KEYBDINPUT { wVk = 0x11 } } },
                new NativeMethods.INPUT { type = 1, u = new NativeMethods.InputUnion { ki = new NativeMethods.KEYBDINPUT { wVk = 0x43 } } },
                new NativeMethods.INPUT { type = 1, u = new NativeMethods.InputUnion { ki = new NativeMethods.KEYBDINPUT { wVk = 0x43, dwFlags = 0x0002 } } },
                new NativeMethods.INPUT { type = 1, u = new NativeMethods.InputUnion { ki = new NativeMethods.KEYBDINPUT { wVk = 0x11, dwFlags = 0x0002 } } },
            };
            NativeMethods.SendInput((uint)inputs.Length, inputs, System.Runtime.InteropServices.Marshal.SizeOf<NativeMethods.INPUT>());

            // 클립보드 업데이트 대기 (앱마다 다름)
            System.Threading.Thread.Sleep(80);

            // 클립보드에서 새 텍스트 확인 (STA 필요)
            string? selected = null;
            Dispatcher.Invoke(() =>
            {
                if (System.Windows.Clipboard.ContainsText())
                {
                    var copied = System.Windows.Clipboard.GetText();
                    if (copied != prevText && !string.IsNullOrWhiteSpace(copied))
                        selected = copied;
                }

                // 클립보드 복원
                if (selected != null && prevText != null)
                    System.Windows.Clipboard.SetText(prevText);
                else if (selected != null && !hadText)
                    System.Windows.Clipboard.Clear();
            });

            return selected;
        }
        catch (Exception)
        {
            return null;
        }
    }

    /// <summary>AI 텍스트 명령을 AX Agent 대화로 전달합니다.</summary>
    private void ExecuteTextAction(TextActionPopup.ActionResult action, string text)
    {
        var prompt = action switch
        {
            TextActionPopup.ActionResult.Translate   => $"다음 텍스트를 번역해줘:\n\n{text}",
            TextActionPopup.ActionResult.Summarize   => $"다음 텍스트를 요약해줘:\n\n{text}",
            TextActionPopup.ActionResult.GrammarFix  => $"다음 텍스트의 문법을 교정해줘:\n\n{text}",
            TextActionPopup.ActionResult.Explain     => $"다음 텍스트를 쉽게 설명해줘:\n\n{text}",
            TextActionPopup.ActionResult.Rewrite     => $"다음 텍스트를 다시 작성해줘:\n\n{text}",
            _ => text
        };

        // ! 프리픽스로 AX Agent에 전달
        _launcher?.Show();
        _launcher?.SetInputText($"! {prompt}");
    }

    private static class NativeMethods
    {
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
        public struct INPUT { public uint type; public InputUnion u; }

        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Explicit)]
        public struct InputUnion { [System.Runtime.InteropServices.FieldOffset(0)] public KEYBDINPUT ki; }

        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
        public struct KEYBDINPUT { public ushort wVk; public ushort wScan; public uint dwFlags; public uint time; public IntPtr dwExtraInfo; }
    }

    private void OnCaptureHotkeyTriggered(object? sender, EventArgs e)
    {
        // 런처 없이 직접 캡처 실행
        WindowTracker.Capture();
        var mode = _settings?.Settings.ScreenCapture.GlobalHotkeyMode ?? "screen";
        Dispatcher.Invoke(async () =>
        {
            if (_captureHandler == null) return;
            try
            {
                await _captureHandler.CaptureDirectAsync(mode);
            }
            catch (Exception ex)
            {
                LogService.Error($"글로벌 캡처 실패: {ex.Message}");
            }
        });
    }

    private void OnHookFailed(object? sender, EventArgs e)
    {
        Dispatcher.Invoke(() =>
        {
            _trayIcon?.ShowBalloonTip(3000, "AX Copilot",
                $"글로벌 단축키 등록에 실패했습니다.\n다른 앱과 {_settings?.Settings.Hotkey ?? "단축키"}가 충돌하고 있을 수 있습니다.",
                ToolTipIcon.Warning);
        });
    }
}