import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

abstract final class AppColors {
  static const blue = Color(0xFF176FE8);
  static const blueDark = Color(0xFF76A5FF);
  static const coral = Color(0xFFF06478);
  static const lightCanvas = Color(0xFFF7F7F4);
  static const darkCanvas = Color(0xFF111318);
  static const darkSurface = Color(0xFF191C22);
  static const success = Color(0xFF18815A);
  static const warning = Color(0xFF9A5D10);
  static const danger = Color(0xFFCC3F4D);
}

ThemeData buildTheme(Brightness brightness, TargetPlatform platform) {
  final dark = brightness == Brightness.dark;
  final scheme =
      ColorScheme.fromSeed(
        seedColor: dark ? AppColors.blueDark : AppColors.blue,
        brightness: brightness,
        surface: dark ? AppColors.darkSurface : Colors.white,
      ).copyWith(
        primary: dark ? AppColors.blueDark : AppColors.blue,
        error: dark ? const Color(0xFFFF7B86) : AppColors.danger,
        surface: dark ? AppColors.darkSurface : Colors.white,
        surfaceContainerLowest: dark
            ? AppColors.darkCanvas
            : AppColors.lightCanvas,
      );
  final isIos =
      platform == TargetPlatform.iOS || platform == TargetPlatform.macOS;
  final base = ThemeData(
    useMaterial3: true,
    brightness: brightness,
    colorScheme: scheme,
    scaffoldBackgroundColor: dark
        ? AppColors.darkCanvas
        : AppColors.lightCanvas,
    platform: platform,
    splashFactory: isIos ? NoSplash.splashFactory : InkSparkle.splashFactory,
    visualDensity: VisualDensity.standard,
  );
  final text = base.textTheme.copyWith(
    headlineMedium: base.textTheme.headlineMedium?.copyWith(
      fontSize: 25,
      height: 1.12,
      fontWeight: FontWeight.w700,
      letterSpacing: -0.5,
    ),
    titleLarge: base.textTheme.titleLarge?.copyWith(
      fontSize: 20,
      height: 1.2,
      fontWeight: FontWeight.w700,
      letterSpacing: -0.25,
    ),
    titleMedium: base.textTheme.titleMedium?.copyWith(
      fontSize: 16,
      height: 1.3,
      fontWeight: FontWeight.w600,
    ),
    bodyLarge: base.textTheme.bodyLarge?.copyWith(fontSize: 16, height: 1.5),
    bodyMedium: base.textTheme.bodyMedium?.copyWith(fontSize: 14, height: 1.45),
    bodySmall: base.textTheme.bodySmall?.copyWith(fontSize: 12, height: 1.4),
    labelLarge: base.textTheme.labelLarge?.copyWith(
      fontSize: 14,
      fontWeight: FontWeight.w600,
    ),
  );
  return base.copyWith(
    textTheme: text,
    cupertinoOverrideTheme: CupertinoThemeData(
      brightness: brightness,
      primaryColor: scheme.primary,
      scaffoldBackgroundColor: base.scaffoldBackgroundColor,
    ),
    dividerColor: dark
        ? Colors.white.withValues(alpha: 0.09)
        : const Color(0x1813171E),
    cardTheme: CardThemeData(
      elevation: 0,
      margin: EdgeInsets.zero,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      color: scheme.surface,
    ),
    appBarTheme: AppBarTheme(
      elevation: 0,
      scrolledUnderElevation: 0,
      centerTitle: isIos,
      backgroundColor: base.scaffoldBackgroundColor,
      surfaceTintColor: Colors.transparent,
      titleTextStyle: text.titleMedium?.copyWith(color: scheme.onSurface),
    ),
    navigationBarTheme: NavigationBarThemeData(
      height: 68,
      elevation: 0,
      backgroundColor: dark ? AppColors.darkSurface : Colors.white,
      indicatorColor: Colors.transparent,
      labelTextStyle: WidgetStateProperty.resolveWith(
        (states) => text.bodySmall?.copyWith(
          fontWeight: states.contains(WidgetState.selected)
              ? FontWeight.w700
              : FontWeight.w500,
          color: states.contains(WidgetState.selected)
              ? scheme.primary
              : scheme.onSurfaceVariant,
        ),
      ),
      iconTheme: WidgetStateProperty.resolveWith(
        (states) => IconThemeData(
          size: 23,
          color: states.contains(WidgetState.selected)
              ? scheme.primary
              : scheme.onSurfaceVariant,
        ),
      ),
    ),
    navigationRailTheme: NavigationRailThemeData(
      backgroundColor: scheme.surface,
      indicatorColor: Colors.transparent,
      selectedIconTheme: IconThemeData(color: scheme.primary),
      selectedLabelTextStyle: text.bodySmall?.copyWith(
        color: scheme.primary,
        fontWeight: FontWeight.w700,
      ),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: dark ? const Color(0xFF21252D) : Colors.white,
      contentPadding: const EdgeInsets.symmetric(horizontal: 14, vertical: 13),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide.none,
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: base.dividerColor),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: scheme.primary, width: 1.5),
      ),
    ),
    filledButtonTheme: FilledButtonThemeData(
      style: FilledButton.styleFrom(
        minimumSize: Size(48, isIos ? 44 : 48),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        textStyle: text.labelLarge,
      ),
    ),
    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        minimumSize: Size(48, isIos ? 44 : 48),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        side: BorderSide(color: base.dividerColor),
      ),
    ),
    bottomSheetTheme: BottomSheetThemeData(
      backgroundColor: scheme.surface,
      surfaceTintColor: Colors.transparent,
      showDragHandle: true,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(22)),
      ),
    ),
  );
}

extension ThemeX on BuildContext {
  ColorScheme get colors => Theme.of(this).colorScheme;
  TextTheme get text => Theme.of(this).textTheme;
  bool get isDark => Theme.of(this).brightness == Brightness.dark;
  bool get isIos => Theme.of(this).platform == TargetPlatform.iOS;
  double get minTouch => isIos ? 44 : 48;
}