import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'dart:ui';
import '../theme/app_colors.dart';
import 'themed_text.dart';

/// 글래스모피즘 효과가 적용된 통일된 앱바
class GlassmorphicAppBar extends StatelessWidget implements PreferredSizeWidget {
  final String title;
  final List<Widget>? actions;
  final Widget? leading;
  final bool automaticallyImplyLeading;
  final double elevation;
  final Color? backgroundColor;
  final double blur;
  final double opacity;
  final PreferredSizeWidget? bottom;
  final bool centerTitle;
  final double? titleSpacing;
  final VoidCallback? onBackPressed;

  const GlassmorphicAppBar({
    super.key,
    required this.title,
    this.actions,
    this.leading,
    this.automaticallyImplyLeading = true,
    this.elevation = 0,
    this.backgroundColor,
    this.blur = 20,
    this.opacity = 0.1,
    this.bottom,
    this.centerTitle = false,
    this.titleSpacing,
    this.onBackPressed,
  });

  @override
  Size get preferredSize => Size.fromHeight(
      kToolbarHeight + (bottom?.preferredSize.height ?? 0.0) + 0.5);

  @override
  Widget build(BuildContext context) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
    final canPop = Navigator.of(context).canPop();
    
    return ClipRRect(
      child: BackdropFilter(
        filter: ImageFilter.blur(sigmaX: blur, sigmaY: blur),
        child: Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [
                (backgroundColor ?? (isDarkMode 
                    ? AppColors.glassBackgroundDark 
                    : AppColors.glassBackground)).withValues(alpha: opacity),
                (backgroundColor ?? (isDarkMode 
                    ? AppColors.glassSurfaceDark 
                    : AppColors.glassSurface)).withValues(alpha: opacity * 0.8),
              ],
            ),
            border: Border(
              bottom: BorderSide(
                color: isDarkMode 
                    ? AppColors.primaryColor.withValues(alpha: 0.3)
                    : AppColors.glassBorder.withValues(alpha: 0.5),
                width: 0.5,
              ),
            ),
          ),
          child: SafeArea(
            bottom: false,
            child: ClipRect(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                Flexible(
                  child: SizedBox(
                    height: kToolbarHeight,
                    child: NavigationToolbar(
                      leading: leading ?? (automaticallyImplyLeading && (canPop || onBackPressed != null)
                          ? _buildBackButton(context)
                          : null),
                      middle: _buildTitle(context),
                      trailing: actions != null
                          ? Row(
                              mainAxisSize: MainAxisSize.min,
                              children: actions!,
                            )
                          : null,
                      centerMiddle: centerTitle,
                      middleSpacing: titleSpacing ?? NavigationToolbar.kMiddleSpacing,
                    ),
                  ),
                ),
                if (bottom != null) bottom!,
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildBackButton(BuildContext context) {
    return IconButton(
      icon: const Icon(Icons.arrow_back_ios_new_rounded),
      onPressed: onBackPressed ?? () {
        HapticFeedback.lightImpact();
        Navigator.of(context).pop();
      },
      splashRadius: 24,
      tooltip: '뒤로가기',
      color: ThemedText.getContrastColor(context),
    );
  }

  Widget _buildTitle(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16),
      child: ThemedText.headline(
        text: title,
        style: const TextStyle(
          fontSize: 22,
          fontWeight: FontWeight.w600,
          letterSpacing: -0.2,
        ),
      ),
    );
  }

  /// 투명 스타일 팩토리
  static GlassmorphicAppBar transparent({
    required String title,
    List<Widget>? actions,
    Widget? leading,
    VoidCallback? onBackPressed,
  }) {
    return GlassmorphicAppBar(
      title: title,
      actions: actions,
      leading: leading,
      blur: 30,
      opacity: 0.05,
      onBackPressed: onBackPressed,
    );
  }

  /// 반투명 스타일 팩토리
  static GlassmorphicAppBar translucent({
    required String title,
    List<Widget>? actions,
    Widget? leading,
    VoidCallback? onBackPressed,
  }) {
    return GlassmorphicAppBar(
      title: title,
      actions: actions,
      leading: leading,
      blur: 20,
      opacity: 0.15,
      onBackPressed: onBackPressed,
    );
  }
}

/// 확장된 글래스모피즘 앱바 (이미지나 추가 콘텐츠 포함)
class GlassmorphicSliverAppBar extends StatelessWidget {
  final String title;
  final List<Widget>? actions;
  final Widget? leading;
  final double expandedHeight;
  final bool floating;
  final bool pinned;
  final bool snap;
  final Widget? flexibleSpace;
  final double blur;
  final double opacity;
  final bool automaticallyImplyLeading;
  final VoidCallback? onBackPressed;
  final bool centerTitle;

  const GlassmorphicSliverAppBar({
    super.key,
    required this.title,
    this.actions,
    this.leading,
    this.expandedHeight = kToolbarHeight,
    this.floating = false,
    this.pinned = true,
    this.snap = false,
    this.flexibleSpace,
    this.blur = 20,
    this.opacity = 0.1,
    this.automaticallyImplyLeading = true,
    this.onBackPressed,
    this.centerTitle = false,
  });

  @override
  Widget build(BuildContext context) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
    final canPop = Navigator.of(context).canPop();
    
    return SliverAppBar(
      expandedHeight: expandedHeight,
      floating: floating,
      pinned: pinned,
      snap: snap,
      backgroundColor: Colors.transparent,
      elevation: 0,
      automaticallyImplyLeading: false,
      leading: leading ?? (automaticallyImplyLeading && (canPop || onBackPressed != null)
          ? IconButton(
              icon: const Icon(Icons.arrow_back_ios_new_rounded),
              onPressed: onBackPressed ?? () {
                HapticFeedback.lightImpact();
                Navigator.of(context).pop();
              },
              splashRadius: 24,
              tooltip: '뒤로가기',
            )
          : null),
      actions: actions,
      centerTitle: centerTitle,
      flexibleSpace: LayoutBuilder(
        builder: (BuildContext context, BoxConstraints constraints) {
          final top = constraints.biggest.height;
          final isCollapsed = top <= kToolbarHeight + MediaQuery.of(context).padding.top;
          
          return FlexibleSpaceBar(
            title: isCollapsed 
                ? ThemedText.headline(
                    text: title,
                    style: const TextStyle(
                      fontSize: 18,
                      fontWeight: FontWeight.w600,
                      letterSpacing: -0.2,
                    ),
                  )
                : null,
            centerTitle: centerTitle,
            titlePadding: const EdgeInsets.only(left: 16, bottom: 16, right: 16),
            background: Stack(
              fit: StackFit.expand,
              children: [
                // 글래스모피즘 배경
                ClipRRect(
                  child: BackdropFilter(
                    filter: ImageFilter.blur(sigmaX: blur, sigmaY: blur),
                    child: Container(
                      decoration: BoxDecoration(
                        gradient: LinearGradient(
                          begin: Alignment.topLeft,
                          end: Alignment.bottomRight,
                          colors: [
                            (isDarkMode 
                                ? AppColors.glassBackgroundDark 
                                : AppColors.glassBackground).withValues(alpha: opacity),
                            (isDarkMode 
                                ? AppColors.glassSurfaceDark 
                                : AppColors.glassSurface).withValues(alpha: opacity * 0.8),
                          ],
                        ),
                        border: Border(
                          bottom: BorderSide(
                            color: isDarkMode 
                                ? AppColors.primaryColor.withValues(alpha: 0.3)
                                : AppColors.glassBorder.withValues(alpha: 0.5),
                            width: 0.5,
                          ),
                        ),
                      ),
                    ),
                  ),
                ),
                // 확장 상태에서만 보이는 타이틀
                if (!isCollapsed)
                  Positioned(
                    left: 16,
                    right: 16,
                    bottom: 16,
                    child: ThemedText.headline(
                      text: title,
                      style: const TextStyle(
                        fontSize: 28,
                        fontWeight: FontWeight.w700,
                        letterSpacing: -0.5,
                      ),
                    ),
                  ),
                // 커스텀 flexibleSpace가 있으면 추가
                if (flexibleSpace != null) flexibleSpace!,
              ],
            ),
          );
        },
      ),
    );
  }
}