nj/app/lib/core/theme/app_theme.dart

// 暖记主题入口 — 浅色/深色 ThemeData

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

import 'app_colors.dart';
import 'app_typography.dart';
import 'app_radius.dart';

class AppTheme {
  AppTheme._();

  /// 浅色主题
  static ThemeData light() => _buildTheme(AppColors.lightScheme());

  /// 深色主题
  static ThemeData dark() => _buildTheme(AppColors.darkScheme());

  static ThemeData _buildTheme(ColorScheme colorScheme) {
    final isLight = colorScheme.brightness == Brightness.light;
    final textTheme = isLight
        ? AppTypography.lightTextTheme()
        : AppTypography.darkTextTheme();

    return ThemeData(
      useMaterial3: true,
      colorScheme: colorScheme,
      textTheme: textTheme,
      scaffoldBackgroundColor: isLight ? AppColors.bgLight : AppColors.bgDark,

      // AppBar
      appBarTheme: AppBarTheme(
        elevation: 0,
        scrolledUnderElevation: 1,
        centerTitle: true,
        backgroundColor: isLight ? AppColors.bgLight : AppColors.bgDark,
        foregroundColor: colorScheme.onSurface,
        titleTextStyle: textTheme.titleLarge,
      ),

      // Card
      cardTheme: CardThemeData(
        elevation: 0,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.mdBorder,
          side: BorderSide(
            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
          ),
        ),
        color: colorScheme.surface,
      ),

      // ElevatedButton
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          elevation: 0,
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
          shape: RoundedRectangleBorder(
            borderRadius: AppRadius.smBorder,
          ),
          backgroundColor: colorScheme.primary,
          foregroundColor: colorScheme.onPrimary,
          textStyle: textTheme.labelLarge,
        ),
      ),

      // OutlinedButton
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
          shape: RoundedRectangleBorder(
            borderRadius: AppRadius.smBorder,
          ),
          side: BorderSide(color: colorScheme.primary),
          textStyle: textTheme.labelLarge,
        ),
      ),

      // InputDecoration
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: colorScheme.surfaceContainerHighest.withValues(alpha: 0.5),
        border: OutlineInputBorder(
          borderRadius: AppRadius.smBorder,
          borderSide: BorderSide.none,
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: AppRadius.smBorder,
          borderSide: BorderSide.none,
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: AppRadius.smBorder,
          borderSide: BorderSide(
            color: colorScheme.primary,
            width: 2,
          ),
        ),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
      ),

      // BottomNavigationBar
      bottomNavigationBarTheme: BottomNavigationBarThemeData(
        type: BottomNavigationBarType.fixed,
        selectedItemColor: colorScheme.primary,
        unselectedItemColor: colorScheme.onSurface.withValues(alpha: 0.5),
        backgroundColor: colorScheme.surface,
        elevation: 8,
      ),

      // Chip
      chipTheme: ChipThemeData(
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.pillBorder,
        ),
        side: BorderSide.none,
      ),

      // FloatingActionButton
      floatingActionButtonTheme: FloatingActionButtonThemeData(
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.mdBorder,
        ),
        elevation: 4,
      ),

      // Page transitions — 弹性曲线
      pageTransitionsTheme: PageTransitionsTheme(
        builders: {
          TargetPlatform.android: _WarmCurveBuilder(),
          TargetPlatform.iOS: const CupertinoPageTransitionsBuilder(),
        },
      ),
    );
  }
}

/// 暖记弹性页面转场: cubic-bezier(0.34, 1.56, 0.64, 1)
class _WarmCurveBuilder extends PageTransitionsBuilder {
  const _WarmCurveBuilder();

  static const Curve _warmCurve = Curves.easeOutBack;

  @override
  Widget buildTransitions<T>(
    PageRoute<T> route,
    BuildContext context,
    Animation<double> animation,
    Animation<double> secondaryAnimation,
    Widget child,
  ) {
    return SlideTransition(
      position: animation.drive(
        Tween(begin: const Offset(1.0, 0.0), end: Offset.zero)
            .chain(CurveTween(curve: _warmCurve)),
      ),
      child: child,
    );
  }
}