import 'package:flutter/material.dart';

class AppTheme {
  static const Color brandBlue = Color(0xFF2F7BFF);
  static const Color darkBackground = Color(0xFF071A2E);
  static const Color darkSurface = Color(0xFF10253A);
  static const Color darkSurfaceAlt = Color(0xFF173149);
  static const Color lightBackground = Color(0xFFF4F8FC);
  static const Color lightSurface = Color(0xFFFFFFFF);
  static const Color lightSurfaceAlt = Color(0xFFEAF1F8);

  static ThemeData light() {
    return _buildTheme(
      brightness: Brightness.light,
      colorScheme: ColorScheme.fromSeed(
        seedColor: brandBlue,
        brightness: Brightness.light,
        primary: brandBlue,
        surface: lightSurface,
      ),
      scaffoldBackgroundColor: lightBackground,
      panelColor: lightSurface,
      panelAltColor: lightSurfaceAlt,
    );
  }

  static ThemeData dark() {
    return _buildTheme(
      brightness: Brightness.dark,
      colorScheme: ColorScheme.fromSeed(
        seedColor: brandBlue,
        brightness: Brightness.dark,
        primary: brandBlue,
        surface: darkSurface,
      ),
      scaffoldBackgroundColor: darkBackground,
      panelColor: darkSurface,
      panelAltColor: darkSurfaceAlt,
    );
  }

  static ThemeData _buildTheme({
    required Brightness brightness,
    required ColorScheme colorScheme,
    required Color scaffoldBackgroundColor,
    required Color panelColor,
    required Color panelAltColor,
  }) {
    final isDark = brightness == Brightness.dark;
    final onSurfaceMuted = colorScheme.onSurface.withValues(alpha: 0.68);
    final baseChipTheme = ThemeData(
      useMaterial3: true,
      brightness: brightness,
      colorScheme: colorScheme,
    ).chipTheme;

    return ThemeData(
      useMaterial3: true,
      brightness: brightness,
      colorScheme: colorScheme,
      scaffoldBackgroundColor: scaffoldBackgroundColor,
      dividerColor: colorScheme.outlineVariant.withValues(alpha: 0.42),
      appBarTheme: AppBarTheme(
        elevation: 0,
        scrolledUnderElevation: 0,
        backgroundColor: Colors.transparent,
        foregroundColor: colorScheme.onSurface,
        centerTitle: false,
        titleTextStyle: TextStyle(
          color: colorScheme.onSurface,
          fontSize: 28,
          fontWeight: FontWeight.w700,
          letterSpacing: -0.5,
        ),
      ),
      cardTheme: CardThemeData(
        elevation: 0,
        color: panelColor,
        margin: EdgeInsets.zero,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(22),
          side: BorderSide(
            color: colorScheme.outlineVariant.withValues(alpha: 0.55),
          ),
        ),
      ),
      navigationBarTheme: NavigationBarThemeData(
        backgroundColor: panelColor,
        indicatorColor: colorScheme.primary.withValues(alpha: isDark ? 0.20 : 0.14),
        labelTextStyle: WidgetStateProperty.resolveWith(
          (states) => TextStyle(
            fontSize: 12,
            fontWeight: states.contains(WidgetState.selected)
                ? FontWeight.w700
                : FontWeight.w500,
          ),
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          backgroundColor: colorScheme.primary,
          foregroundColor: colorScheme.onPrimary,
          minimumSize: const Size.fromHeight(52),
          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 14),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
          ),
          textStyle: const TextStyle(fontSize: 16, fontWeight: FontWeight.w700),
        ),
      ),
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          foregroundColor: colorScheme.onSurface,
          minimumSize: const Size.fromHeight(48),
          side: BorderSide(
            color: colorScheme.outlineVariant.withValues(alpha: 0.8),
          ),
          padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 14),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
          ),
        ),
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: colorScheme.primary,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(14),
          ),
        ),
      ),
      listTileTheme: ListTileThemeData(
        iconColor: colorScheme.primary,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18)),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      ),
      chipTheme: baseChipTheme.copyWith(
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(999),
        ),
        side: BorderSide(
          color: colorScheme.outlineVariant.withValues(alpha: 0.6),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: panelAltColor,
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
        hintStyle: TextStyle(color: onSurfaceMuted),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: BorderSide.none,
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: BorderSide(
            color: colorScheme.outlineVariant.withValues(alpha: 0.55),
          ),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: BorderSide(color: colorScheme.primary, width: 1.2),
        ),
      ),
      dialogTheme: DialogThemeData(
        backgroundColor: panelColor,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(24)),
      ),
      bottomSheetTheme: BottomSheetThemeData(
        backgroundColor: panelColor,
        modalBackgroundColor: panelColor,
        shape: const RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
        ),
      ),
      snackBarTheme: SnackBarThemeData(
        behavior: SnackBarBehavior.floating,
        backgroundColor: panelAltColor,
        contentTextStyle: TextStyle(color: colorScheme.onSurface),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      ),
    );
  }
}