import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'app_colors.dart';
import 'app_typography.dart';
import 'app_spacing.dart';

/// Genex Material 3 Theme Configuration
///
/// 干净清爽型紫色主题，零区块链感知的金融App体验
class AppTheme {
  AppTheme._();

  static ThemeData get light => ThemeData(
        useMaterial3: true,
        brightness: Brightness.light,

        // Color Scheme
        colorScheme: const ColorScheme.light(
          primary: AppColors.primary,
          primaryContainer: AppColors.primaryContainer,
          secondary: AppColors.success,
          secondaryContainer: AppColors.successLight,
          tertiary: AppColors.info,
          error: AppColors.error,
          errorContainer: AppColors.errorLight,
          surface: AppColors.surface,
          surfaceContainerHighest: AppColors.surfaceVariant,
          onPrimary: Colors.white,
          onSecondary: Colors.white,
          onSurface: AppColors.textPrimary,
          onSurfaceVariant: AppColors.textSecondary,
          outline: AppColors.border,
          outlineVariant: AppColors.borderLight,
          scrim: AppColors.scrim,
        ),

        scaffoldBackgroundColor: AppColors.background,

        // AppBar
        appBarTheme: const AppBarTheme(
          elevation: 0,
          scrolledUnderElevation: 0.5,
          centerTitle: true,
          backgroundColor: AppColors.surface,
          foregroundColor: AppColors.textPrimary,
          surfaceTintColor: Colors.transparent,
          systemOverlayStyle: SystemUiOverlayStyle(
            statusBarColor: Colors.transparent,
            statusBarIconBrightness: Brightness.dark,
            statusBarBrightness: Brightness.light,
          ),
          titleTextStyle: AppTypography.h3,
          iconTheme: IconThemeData(color: AppColors.textPrimary, size: 24),
        ),

        // Bottom Navigation
        bottomNavigationBarTheme: const BottomNavigationBarThemeData(
          type: BottomNavigationBarType.fixed,
          backgroundColor: AppColors.surface,
          selectedItemColor: AppColors.primary,
          unselectedItemColor: AppColors.textTertiary,
          elevation: 0,
          selectedLabelStyle: TextStyle(fontSize: 11, fontWeight: FontWeight.w600),
          unselectedLabelStyle: TextStyle(fontSize: 11, fontWeight: FontWeight.w400),
        ),

        // Navigation Bar (M3)
        navigationBarTheme: NavigationBarThemeData(
          backgroundColor: AppColors.surface,
          indicatorColor: AppColors.primaryContainer,
          surfaceTintColor: Colors.transparent,
          elevation: 0,
          height: AppSpacing.bottomNavHeight,
          labelBehavior: NavigationDestinationLabelBehavior.alwaysShow,
          iconTheme: WidgetStateProperty.resolveWith((states) {
            if (states.contains(WidgetState.selected)) {
              return const IconThemeData(color: AppColors.primary, size: 24);
            }
            return const IconThemeData(color: AppColors.textTertiary, size: 24);
          }),
          labelTextStyle: WidgetStateProperty.resolveWith((states) {
            if (states.contains(WidgetState.selected)) {
              return AppTypography.caption.copyWith(
                color: AppColors.primary,
                fontWeight: FontWeight.w600,
              );
            }
            return AppTypography.caption;
          }),
        ),

        // Card
        cardTheme: CardThemeData(
          elevation: 0,
          color: AppColors.surface,
          surfaceTintColor: Colors.transparent,
          shape: RoundedRectangleBorder(
            borderRadius: AppSpacing.borderRadiusMd,
            side: const BorderSide(color: AppColors.borderLight, width: 1),
          ),
          margin: EdgeInsets.zero,
        ),

        // Elevated Button
        elevatedButtonTheme: ElevatedButtonThemeData(
          style: ElevatedButton.styleFrom(
            backgroundColor: AppColors.primary,
            foregroundColor: Colors.white,
            elevation: 0,
            minimumSize: const Size(0, AppSpacing.buttonHeight),
            shape: RoundedRectangleBorder(
              borderRadius: AppSpacing.borderRadiusMd,
            ),
            textStyle: AppTypography.labelLarge,
          ),
        ),

        // Outlined Button
        outlinedButtonTheme: OutlinedButtonThemeData(
          style: OutlinedButton.styleFrom(
            foregroundColor: AppColors.primary,
            side: const BorderSide(color: AppColors.primary, width: 1.5),
            minimumSize: const Size(0, AppSpacing.buttonHeight),
            shape: RoundedRectangleBorder(
              borderRadius: AppSpacing.borderRadiusMd,
            ),
            textStyle: AppTypography.labelLarge,
          ),
        ),

        // Text Button
        textButtonTheme: TextButtonThemeData(
          style: TextButton.styleFrom(
            foregroundColor: AppColors.primary,
            textStyle: AppTypography.labelMedium,
          ),
        ),

        // Input Decoration
        inputDecorationTheme: InputDecorationTheme(
          filled: true,
          fillColor: AppColors.gray50,
          contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
          border: OutlineInputBorder(
            borderRadius: AppSpacing.borderRadiusMd,
            borderSide: BorderSide.none,
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: AppSpacing.borderRadiusMd,
            borderSide: const BorderSide(color: AppColors.borderLight, width: 1),
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: AppSpacing.borderRadiusMd,
            borderSide: const BorderSide(color: AppColors.primary, width: 1.5),
          ),
          errorBorder: OutlineInputBorder(
            borderRadius: AppSpacing.borderRadiusMd,
            borderSide: const BorderSide(color: AppColors.error, width: 1),
          ),
          hintStyle: AppTypography.bodyMedium.copyWith(color: AppColors.textTertiary),
          labelStyle: AppTypography.bodyMedium,
          errorStyle: AppTypography.caption.copyWith(color: AppColors.error),
        ),

        // Chip
        chipTheme: ChipThemeData(
          backgroundColor: AppColors.gray50,
          selectedColor: AppColors.primaryContainer,
          labelStyle: AppTypography.labelSmall,
          shape: RoundedRectangleBorder(
            borderRadius: AppSpacing.borderRadiusFull,
          ),
          side: const BorderSide(color: AppColors.borderLight),
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
        ),

        // TabBar
        tabBarTheme: TabBarThemeData(
          labelColor: AppColors.primary,
          unselectedLabelColor: AppColors.textTertiary,
          labelStyle: AppTypography.labelMedium,
          unselectedLabelStyle: AppTypography.labelMedium,
          indicatorSize: TabBarIndicatorSize.label,
          indicator: const UnderlineTabIndicator(
            borderSide: BorderSide(color: AppColors.primary, width: 2.5),
          ),
          dividerColor: Colors.transparent,
        ),

        // Dialog
        dialogTheme: DialogThemeData(
          backgroundColor: AppColors.surface,
          surfaceTintColor: Colors.transparent,
          shape: RoundedRectangleBorder(
            borderRadius: AppSpacing.borderRadiusLg,
          ),
          titleTextStyle: AppTypography.h2,
          contentTextStyle: AppTypography.bodyMedium,
        ),

        // BottomSheet
        bottomSheetTheme: const BottomSheetThemeData(
          backgroundColor: AppColors.surface,
          surfaceTintColor: Colors.transparent,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
          ),
          showDragHandle: true,
          dragHandleColor: AppColors.gray300,
          dragHandleSize: Size(36, 4),
        ),

        // Divider
        dividerTheme: const DividerThemeData(
          color: AppColors.borderLight,
          thickness: 1,
          space: 0,
        ),

        // Snackbar
        snackBarTheme: SnackBarThemeData(
          backgroundColor: AppColors.gray800,
          contentTextStyle: AppTypography.bodyMedium.copyWith(color: Colors.white),
          behavior: SnackBarBehavior.floating,
          shape: RoundedRectangleBorder(
            borderRadius: AppSpacing.borderRadiusMd,
          ),
        ),
      );
}