import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:journaler/db.dart';
import 'package:journaler/notes.dart';
import 'package:system_tray/system_tray.dart';
import 'package:window_manager/window_manager.dart';
import 'package:audioplayers/audioplayers.dart';

// TODO: Add an icon to the executable, simply use the existing tray icon
// TODO: Implement some sort of scroll through notes

// Default values - will be replaced by DB values if they exist
const Duration _defaultPopupInterval = Duration(minutes: 20);
const String _defaultNotificationSound = 'MeetTheSniper.mp3';

void main() async {
  await DB.init();
  WidgetsFlutterBinding.ensureInitialized();
  await windowManager.ensureInitialized();

  WindowOptions windowOptions = const WindowOptions(
    size: Size(1600, 900),
    center: true,
    backgroundColor: Colors.transparent,
    skipTaskbar: false,
    titleBarStyle: TitleBarStyle.normal,
  );

  windowManager.waitUntilReadyToShow(windowOptions, () async {
    await windowManager.hide();
  });

  runApp(const JournalerApp());
}

class JournalerApp extends StatelessWidget {
  const JournalerApp({super.key});

  static final TextTheme _baseTextTheme = const TextTheme(
    bodyMedium: TextStyle(fontSize: 24),
  );

  static final TextStyle _baseTitleTextStyle = const TextStyle(
    fontSize: 20,
    fontWeight: FontWeight.w500,
  );

  static final InputDecorationTheme _baseInputDecorationTheme =
      const InputDecorationTheme(
        border: OutlineInputBorder(),
        labelStyle: TextStyle(fontSize: 20),
      );

  static final ThemeData lightTheme = ThemeData.light().copyWith(
    visualDensity: VisualDensity.adaptivePlatformDensity,
    colorScheme: ColorScheme.fromSeed(
      seedColor: Colors.blue,
      brightness: Brightness.light,
    ),
    scaffoldBackgroundColor: Colors.grey[100],
    appBarTheme: AppBarTheme(
      backgroundColor: Colors.blue,
      foregroundColor: Colors.white,
      titleTextStyle: _baseTitleTextStyle.copyWith(color: Colors.white),
    ),
    inputDecorationTheme: _baseInputDecorationTheme.copyWith(
      focusedBorder: OutlineInputBorder(
        borderSide: BorderSide(color: Colors.blue.shade600, width: 2.0),
      ),
      labelStyle: _baseInputDecorationTheme.labelStyle?.copyWith(
        color: Colors.grey[700],
      ),
    ),
    textTheme: _baseTextTheme,
  );

  static final ThemeData darkTheme = ThemeData.dark().copyWith(
    visualDensity: VisualDensity.adaptivePlatformDensity,
    colorScheme: ColorScheme.fromSeed(
      seedColor: Colors.blue,
      brightness: Brightness.dark,
    ),
    scaffoldBackgroundColor: Colors.grey[900],
    appBarTheme: AppBarTheme(
      backgroundColor: Colors.grey[850],
      foregroundColor: Colors.white,
      titleTextStyle: _baseTitleTextStyle.copyWith(color: Colors.white),
    ),
    inputDecorationTheme: _baseInputDecorationTheme.copyWith(
      border: const OutlineInputBorder(
        borderSide: BorderSide(color: Colors.grey),
      ),
      focusedBorder: OutlineInputBorder(
        borderSide: BorderSide(color: Colors.blue.shade300, width: 2.0),
      ),
      labelStyle: _baseInputDecorationTheme.labelStyle?.copyWith(
        color: Colors.grey[400],
      ),
    ),
    textTheme: _baseTextTheme.copyWith(
      bodyMedium: _baseTextTheme.bodyMedium?.copyWith(color: Colors.white),
    ),
  );

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Journaler',
      theme: lightTheme,
      darkTheme: darkTheme,
      themeMode: ThemeMode.system,
      home: const MainPage(),
      debugShowCheckedModeBanner: false,
    );
  }
}

class MainPage extends StatefulWidget {
  const MainPage({super.key});

  @override
  State<MainPage> createState() => MainPageState();
}

class MainPageState extends State<MainPage> with WindowListener {
  final SystemTray _systemTray = SystemTray();
  final Menu _menu = Menu();
  final AudioPlayer _audioPlayer = AudioPlayer();

  final TextEditingController _previousEntryController =
      TextEditingController();
  final TextEditingController _currentEntryController = TextEditingController();
  final FocusNode _currentEntryFocusNode = FocusNode();
  final TextEditingController _scratchController = TextEditingController();
  final TextEditingController _intervalController = TextEditingController();
  final TextEditingController _soundController = TextEditingController();

  Note? previousNote;
  Duration _currentPopupInterval = _defaultPopupInterval;
  String _currentNotificationSound = _defaultNotificationSound;

  Timer? _popupTimer;
  Timer? _debounceTimer;

  @override
  void initState() {
    super.initState();
    windowManager.addListener(this);
    _initSystemTray();
    _loadData();
    windowManager.setPreventClose(true);
    _setWindowConfig();
  }

  @override
  void dispose() {
    windowManager.removeListener(this);
    _popupTimer?.cancel();
    _debounceTimer?.cancel();
    _previousEntryController.dispose();
    _currentEntryController.dispose();
    _currentEntryFocusNode.dispose();
    _scratchController.dispose();
    _intervalController.dispose();
    _soundController.dispose();
    _audioPlayer.dispose();
    super.dispose();
  }

  @override
  void onWindowClose() {
    _saveData();
    windowManager.hide();
  }

  @override
  void onWindowFocus() {
    setState(() {});
  }

  Future<void> _initSystemTray() async {
    String iconPath = 'assets/app_icon.ico';

    await _systemTray.initSystemTray(iconPath: iconPath, toolTip: "Journaler");

    await _menu.buildFrom([
      MenuItemLabel(
        label: 'Commit Sudoku',
        onClicked: (menuItem) => windowManager.destroy(),
      ),
    ]);

    await _systemTray.setContextMenu(_menu);

    _systemTray.registerSystemTrayEventHandler((eventName) {
      debugPrint("System Tray Event: $eventName");
      if (eventName == kSystemTrayEventClick) {
        _showWindow();
      } else if (eventName == kSystemTrayEventRightClick) {
        _systemTray.popUpContextMenu();
      }
    });
  }

  void _startPopupTimer() {
    _popupTimer?.cancel();
    _popupTimer = Timer.periodic(_currentPopupInterval, (timer) {
      _showWindow();
    });
    debugPrint("Popup timer started with interval: ${_currentPopupInterval.inMinutes} minutes");
  }

  Future<void> _showWindow() async {
    _loadData();
    bool wasVisible = await windowManager.isVisible();
    if (!wasVisible) {
      await windowManager.setSize(const Size(1600, 900));
      await windowManager.center();
      await windowManager.show();
      await windowManager.focus();
      _currentEntryFocusNode.requestFocus();
      await _playSound();
    } else {
      await windowManager.focus();
      _currentEntryFocusNode.requestFocus();
    }
  }

  Future<void> _playSound() async {
    await _audioPlayer.stop();
    try {
      await _audioPlayer.play(AssetSource('sounds/$_currentNotificationSound'));
      debugPrint("Played sound: $_currentNotificationSound");
    } catch (e) {
      debugPrint("Error playing sound $_currentNotificationSound: e");
    }
  }

  void _loadData() async {
    String? intervalMinutesStr = await DB.getSetting('popupIntervalMinutes');
    String? soundFileStr = await DB.getSetting('notificationSound');

    int intervalMinutes = int.tryParse(intervalMinutesStr ?? '') ?? _defaultPopupInterval.inMinutes;
    _currentPopupInterval = Duration(minutes: intervalMinutes);
    _currentNotificationSound = soundFileStr ?? _defaultNotificationSound;

    _intervalController.text = intervalMinutes.toString();
    _soundController.text = _currentNotificationSound;

    _startPopupTimer();

    final note = await getLatestNote();
    previousNote = note;
    _previousEntryController.text = note?.content ?? "";

    final scratch = await getLatestScratch();
    _scratchController.text = scratch?.content ?? "";
    _currentEntryController.text = "";

    debugPrint("Data loaded.");
  }

  void _saveData() async {
    String previousEntry = _previousEntryController.text;
    String currentEntry = _currentEntryController.text;
    String scratchContent = _scratchController.text;
    String intervalStr = _intervalController.text;
    String soundStr = _soundController.text;

    await createNote(currentEntry);
    await createScratch(scratchContent);
    if (previousNote != null) {
      previousNote!.content = previousEntry;
      await updateNote(previousNote!);
    }

    int newIntervalMinutes = int.tryParse(intervalStr) ?? _currentPopupInterval.inMinutes;
    Duration newInterval = Duration(minutes: newIntervalMinutes);
    if (newInterval != _currentPopupInterval) {
      _currentPopupInterval = newInterval;
      DB.setSetting('popupIntervalMinutes', newIntervalMinutes.toString());
      _startPopupTimer();
    } else {
      DB.setSetting('popupIntervalMinutes', newIntervalMinutes.toString());
    }

    if (soundStr != _currentNotificationSound) {
      _currentNotificationSound = soundStr;
      DB.setSetting('notificationSound', soundStr);
    } else {
      DB.setSetting('notificationSound', soundStr);
    }

    debugPrint(
      "Saving data... Current Entry: [${currentEntry.length} chars], Scratch: [${scratchContent.length} chars]",
    );
  }

  Future<void> _setWindowConfig() async {
    await windowManager.setAspectRatio(16 / 9);
  }

  @override
  Widget build(BuildContext context) {
    // Wrap Scaffold with RawKeyboardListener as workaround for Escape key
    return RawKeyboardListener(
      focusNode: FocusNode(), // Needs its own node
      onKey: (RawKeyEvent event) {
        if (event is RawKeyDownEvent &&
            event.logicalKey == LogicalKeyboardKey.escape) {
          debugPrint(
            "Escape pressed inside MainPage (RawKeyboardListener - Workaround)",
          );
          // Call method directly since we are in the state
          FocusManager.instance.primaryFocus?.unfocus(); // Keep unfocus attempt
          onWindowClose();
        }
      },
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Journaler'),
          actions: <Widget>[
            // Group Label and Input for Interval
            Padding(
              padding: const EdgeInsets.symmetric(vertical: 8.0).copyWith(left: 8.0), // Add padding
              child: Row(
                mainAxisSize: MainAxisSize.min, // Use minimum space
                children: [
                  const Text("Interval (m):"),
                  const SizedBox(width: 4), // Space between label and input
                  SizedBox(
                    width: 60, // Constrain width
                    child: TextField(
                      controller: _intervalController,
                      // textAlignVertical: TextAlignVertical.center, // Let default alignment handle it
                      decoration: const InputDecoration(
                        border: OutlineInputBorder(),
                        isDense: true,
                        contentPadding: EdgeInsets.symmetric(horizontal: 8.0, vertical: 8.0),
                      ),
                      keyboardType: TextInputType.number,
                      inputFormatters: <TextInputFormatter>[
                        FilteringTextInputFormatter.digitsOnly
                      ],
                    ),
                  ),
                ],
              ),
            ),
            // Group Label and Input for Sound
            Padding(
              padding: const EdgeInsets.symmetric(vertical: 8.0, horizontal: 8.0),
              child: Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  const Text("Sound:"),
                  const SizedBox(width: 4),
                  SizedBox(
                    width: 150, // Constrain width
                    child: TextField(
                      controller: _soundController,
                      // textAlignVertical: TextAlignVertical.center,
                      decoration: const InputDecoration(
                        border: OutlineInputBorder(),
                        isDense: true,
                        contentPadding: EdgeInsets.symmetric(horizontal: 8.0, vertical: 8.0),
                        hintText: 'sound.mp3',
                      ),
                    ),
                  ),
                ],
              ),
            ),
            // Test Sound Button
            Padding(
              padding: const EdgeInsets.symmetric(vertical: 8.0),
              child: IconButton(
                icon: const Icon(Icons.volume_up),
                tooltip: 'Test Sound',
                onPressed: _playSound,
              ),
            ),
            const SizedBox(width: 10),
          ],
        ),
        body: Padding(
          padding: const EdgeInsets.all(8.0),
          child: Row(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Expanded(
                flex: 9,
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    Expanded(
                      child: TextField(
                        controller: _previousEntryController,
                        maxLines: null,
                        expands: true,
                        style: Theme.of(context).textTheme.bodyMedium,
                        decoration: const InputDecoration(
                          labelText: 'Previous Entry',
                        ),
                      ),
                    ),
                    const SizedBox(height: 8),
                    Expanded(
                      child: TextField(
                        controller: _currentEntryController,
                        focusNode: _currentEntryFocusNode,
                        maxLines: null,
                        expands: true,
                        autofocus: true,
                        style: Theme.of(context).textTheme.bodyMedium,
                        decoration: const InputDecoration(
                          labelText: 'Current Entry (What\'s on your mind?)',
                        ),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(width: 8),
              Expanded(
                flex: 4, // Adjust flex factor as needed
                child: TextField(
                  controller: _scratchController,
                  maxLines: null,
                  expands: true,
                  style: Theme.of(context).textTheme.bodyMedium, // Apply theme text style
                  decoration: const InputDecoration(
                    labelText: 'Scratch',
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// --- End Actions and Shortcuts ---