import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:localsend_app/gen/strings.g.dart';
import 'package:localsend_app/model/persistence/color_mode.dart';
import 'package:localsend_app/provider/device_info_provider.dart';
import 'package:localsend_app/util/native/platform_check.dart';
import 'package:localsend_app/util/ui/dynamic_colors.dart';
import 'package:refena_flutter/refena_flutter.dart';
import 'package:yaru/yaru.dart' as yaru;

final _borderRadius = BorderRadius.circular(5);

/// On desktop, we need to add additional padding to achieve the same visual appearance as on mobile
double get desktopPaddingFix => checkPlatformIsDesktop() ? 8 : 0;

ThemeData getTheme(ColorMode colorMode, Brightness brightness, DynamicColors? dynamicColors) {
  if (colorMode == ColorMode.yaru) {
    return _getYaruTheme(brightness);
  }

  final colorScheme = _determineColorScheme(colorMode, brightness, dynamicColors);

  final lightInputBorder = OutlineInputBorder(
    borderSide: BorderSide(color: colorScheme.secondaryContainer),
    borderRadius: _borderRadius,
  );

  final darkInputBorder = OutlineInputBorder(
    borderSide: BorderSide(color: colorScheme.secondaryContainer),
    borderRadius: _borderRadius,
  );

  // https://github.com/localsend/localsend/issues/52
  final String? fontFamily;
  if (checkPlatform([TargetPlatform.windows])) {
    fontFamily = switch (LocaleSettings.currentLocale) {
      AppLocale.ja => 'Yu Gothic UI',
      AppLocale.ko => 'Malgun Gothic',
      AppLocale.zhCn => 'Microsoft YaHei UI',
      AppLocale.zhHk || AppLocale.zhTw => 'Microsoft JhengHei UI',
      _ => 'Segoe UI Variable Display',
    };
  } else if (checkPlatform([TargetPlatform.linux])) {
    fontFamily = switch (LocaleSettings.currentLocale) {
      AppLocale.ja => 'Noto Sans CJK JP',
      AppLocale.ko => 'Noto Sans CJK KR',
      AppLocale.zhCn => 'Noto Sans CJK SC',
      AppLocale.zhHk || AppLocale.zhTw => 'Noto Sans CJK TC',
      _ => 'Noto Sans',
    };
  } else {
    fontFamily = null;
  }

  return ThemeData(
    colorScheme: colorScheme,
    useMaterial3: true,
    navigationBarTheme: colorScheme.brightness == Brightness.dark
        ? NavigationBarThemeData(
            iconTheme: WidgetStateProperty.all(const IconThemeData(color: Colors.white)),
          )
        : null,
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: colorScheme.secondaryContainer,
      border: colorScheme.brightness == Brightness.light ? lightInputBorder : darkInputBorder,
      focusedBorder: colorScheme.brightness == Brightness.light ? lightInputBorder : darkInputBorder,
      enabledBorder: colorScheme.brightness == Brightness.light ? lightInputBorder : darkInputBorder,
      contentPadding: const EdgeInsets.symmetric(vertical: 0, horizontal: 10),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        foregroundColor: colorScheme.brightness == Brightness.dark ? Colors.white : null,
        padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8 + desktopPaddingFix),
      ),
    ),
    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8 + desktopPaddingFix),
      ),
    ),
    fontFamily: fontFamily,
  );
}

Future<void> updateSystemOverlayStyle(BuildContext context) async {
  final brightness = Theme.of(context).brightness;
  await updateSystemOverlayStyleWithBrightness(brightness);
}

Future<void> updateSystemOverlayStyleWithBrightness(Brightness brightness) async {
  if (checkPlatform([TargetPlatform.android])) {
    // See https://github.com/flutter/flutter/issues/90098
    final darkMode = brightness == Brightness.dark;
    final androidSdkInt = RefenaScope.defaultRef.read(deviceInfoProvider).androidSdkInt ?? 0;
    final bool edgeToEdge = androidSdkInt >= 29;

    SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge); // ignore: unawaited_futures

    SystemChrome.setSystemUIOverlayStyle(
      SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: brightness == Brightness.light ? Brightness.dark : Brightness.light,
        systemNavigationBarColor: edgeToEdge ? Colors.transparent : (darkMode ? Colors.black : Colors.white),
        systemNavigationBarContrastEnforced: false,
        systemNavigationBarIconBrightness: darkMode ? Brightness.light : Brightness.dark,
      ),
    );
  } else {
    SystemChrome.setSystemUIOverlayStyle(
      SystemUiOverlayStyle(
        statusBarBrightness: brightness, // iOS
        statusBarColor: Colors.transparent, // Not relevant to this issue
      ),
    );
  }
}

extension ThemeDataExt on ThemeData {
  /// This is the actual [cardColor] being used.
  Color get cardColorWithElevation {
    return ElevationOverlay.applySurfaceTint(cardColor, colorScheme.surfaceTint, 1);
  }
}

extension ColorSchemeExt on ColorScheme {
  Color get warning {
    return Colors.orange;
  }

  Color? get secondaryContainerIfDark {
    return brightness == Brightness.dark ? secondaryContainer : null;
  }

  Color? get onSecondaryContainerIfDark {
    return brightness == Brightness.dark ? onSecondaryContainer : null;
  }
}

extension InputDecorationThemeExt on InputDecorationThemeData {
  BorderRadius get borderRadius => _borderRadius;
}

ColorScheme _determineColorScheme(ColorMode mode, Brightness brightness, DynamicColors? dynamicColors) {
  final defaultColorScheme = ColorScheme.fromSeed(
    seedColor: Colors.teal,
    brightness: brightness,
  );

  final colorScheme = switch (mode) {
    ColorMode.system => brightness == Brightness.light ? dynamicColors?.light : dynamicColors?.dark,
    ColorMode.localsend => null,
    ColorMode.oled => (dynamicColors?.dark ?? defaultColorScheme).copyWith(
      surface: Colors.black,
    ),
    ColorMode.yaru => throw 'Should reach here',
  };

  return colorScheme ?? defaultColorScheme;
}

ThemeData _getYaruTheme(Brightness brightness) {
  final baseTheme = brightness == Brightness.light ? yaru.yaruLight : yaru.yaruDark;
  final colorScheme = baseTheme.colorScheme;

  final lightInputBorder = OutlineInputBorder(
    borderSide: BorderSide(color: colorScheme.secondaryContainer),
    borderRadius: _borderRadius,
  );

  final darkInputBorder = OutlineInputBorder(
    borderSide: BorderSide(color: colorScheme.secondaryContainer),
    borderRadius: _borderRadius,
  );

  InputDecorationThemeData;

  return baseTheme.copyWith(
    navigationBarTheme: colorScheme.brightness == Brightness.dark
        ? NavigationBarThemeData(
            iconTheme: WidgetStateProperty.all(const IconThemeData(color: Colors.white)),
          )
        : null,
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: colorScheme.secondaryContainer,
      border: colorScheme.brightness == Brightness.light ? lightInputBorder : darkInputBorder,
      focusedBorder: colorScheme.brightness == Brightness.light ? lightInputBorder : darkInputBorder,
      enabledBorder: colorScheme.brightness == Brightness.light ? lightInputBorder : darkInputBorder,
      contentPadding: const EdgeInsets.symmetric(vertical: 0, horizontal: 10),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        foregroundColor: colorScheme.brightness == Brightness.dark ? Colors.white : null,
        padding: checkPlatformIsDesktop() ? const EdgeInsets.all(16) : const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      ),
    ),
    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        padding: checkPlatformIsDesktop() ? const EdgeInsets.all(16) : const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      ),
    ),
  );
}