lab-app/lib/core/widgets/gradient_app_bar.dart

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

import '../theme/app_theme.dart';
import 'tooth_logo.dart';

class GradientAppBar extends StatelessWidget implements PreferredSizeWidget {
  const GradientAppBar({
    super.key,
    required this.title,
    required this.category,
    this.actions = const [],
    this.searchController,
    this.onSearchChanged,
    this.searchHint,
  });

  final String title;
  final String category;
  final List<Widget> actions;
  final TextEditingController? searchController;
  final ValueChanged<String>? onSearchChanged;
  final String? searchHint;

  bool get _hasSearch =>
      searchController != null && onSearchChanged != null;

  @override
  Size get preferredSize =>
      Size.fromHeight(kToolbarHeight + (_hasSearch ? 52.0 : 0.0));

  @override
  Widget build(BuildContext context) {
    final isDesktop =
        MediaQuery.sizeOf(context).width > AppLayout.sidebarBreakpoint;
    final searchBottom = _hasSearch
        ? _SearchBarBottom(
            controller: searchController!,
            onChanged: onSearchChanged!,
            hint: searchHint ?? 'Ara...',
          )
        : null;

    if (isDesktop) {
      return AppBar(
        backgroundColor: AppColors.surface,
        foregroundColor: AppColors.textPrimary,
        elevation: 0,
        scrolledUnderElevation: 0,
        automaticallyImplyLeading: false,
        titleSpacing: 24,
        title: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(
              'DLS',
              style: TextStyle(
                fontSize: 11,
                color: AppColors.textSecondary.withValues(alpha: 0.8),
                letterSpacing: 0.3,
              ),
            ),
            Text(
              title,
              style: const TextStyle(
                fontSize: 17,
                fontWeight: FontWeight.w700,
                color: AppColors.textPrimary,
              ),
            ),
          ],
        ),
        actions: [
          ...actions,
          if (actions.isNotEmpty) const SizedBox(width: 8),
        ],
        iconTheme:
            const IconThemeData(color: AppColors.textSecondary, size: 22),
        actionsIconTheme:
            const IconThemeData(color: AppColors.textSecondary, size: 22),
        bottom: searchBottom,
      );
    }

    return AppBar(
      backgroundColor: AppColors.primary,
      foregroundColor: Colors.white,
      elevation: 0,
      systemOverlayStyle: SystemUiOverlayStyle.light,
      automaticallyImplyLeading: false,
      leadingWidth: 60,
      leading: Padding(
        padding: const EdgeInsets.only(left: 16, top: 8, bottom: 8),
        child: Container(
          decoration: BoxDecoration(
            color: Colors.white.withValues(alpha: 0.15),
            borderRadius: BorderRadius.circular(10),
          ),
          child:
              const Center(child: ToothLogo(size: 20, color: Colors.white)),
        ),
      ),
      titleSpacing: 8,
      title: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: [
          Text(
            category,
            style: TextStyle(
              color: Colors.white.withValues(alpha: 0.65),
              fontSize: 11,
              fontWeight: FontWeight.w600,
              letterSpacing: 1.5,
            ),
          ),
          Text(
            title,
            style: const TextStyle(
              color: Colors.white,
              fontSize: 15,
              fontWeight: FontWeight.w700,
            ),
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
          ),
        ],
      ),
      actions: actions.isNotEmpty
          ? [...actions, const SizedBox(width: 4)]
          : null,
      iconTheme: const IconThemeData(color: Colors.white, size: 22),
      actionsIconTheme:
          const IconThemeData(color: Colors.white, size: 22),
      flexibleSpace: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topLeft,
            end: Alignment.bottomRight,
            colors: [Color(0xFF0F172A), AppColors.primary],
          ),
        ),
      ),
      bottom: searchBottom,
    );
  }
}

// ── iOS-26-style search bar shown below the AppBar title ─────────────────────

class _SearchBarBottom extends StatelessWidget implements PreferredSizeWidget {
  const _SearchBarBottom({
    required this.controller,
    required this.onChanged,
    required this.hint,
  });

  final TextEditingController controller;
  final ValueChanged<String> onChanged;
  final String hint;

  @override
  Size get preferredSize => const Size.fromHeight(52);

  @override
  Widget build(BuildContext context) {
    final isDesktop =
        MediaQuery.sizeOf(context).width > AppLayout.sidebarBreakpoint;
    final bg = isDesktop
        ? AppColors.surfaceVariant
        : Colors.white.withValues(alpha: 0.15);
    final textColor = isDesktop ? AppColors.textPrimary : Colors.white;
    final iconColor = isDesktop
        ? AppColors.textMuted
        : Colors.white.withValues(alpha: 0.65);
    final hintColor = isDesktop
        ? AppColors.textMuted
        : Colors.white.withValues(alpha: 0.5);

    return SizedBox(
      height: 52,
      child: Padding(
        padding: const EdgeInsets.fromLTRB(16, 4, 16, 10),
        child: ListenableBuilder(
          listenable: controller,
          builder: (context, _) => Container(
            height: 38,
            decoration: BoxDecoration(
              color: bg,
              borderRadius: BorderRadius.circular(12),
              border: isDesktop
                  ? Border.all(color: AppColors.border)
                  : null,
            ),
            child: TextField(
              controller: controller,
              onChanged: onChanged,
              style: TextStyle(color: textColor, fontSize: 15),
              decoration: InputDecoration(
                hintText: hint,
                hintStyle: TextStyle(color: hintColor, fontSize: 15),
                prefixIcon: Padding(
                  padding: const EdgeInsets.only(left: 10, right: 6),
                  child: Icon(Icons.search_rounded,
                      size: 18, color: iconColor),
                ),
                prefixIconConstraints:
                    const BoxConstraints(minWidth: 36, minHeight: 36),
                suffixIcon: controller.text.isNotEmpty
                    ? GestureDetector(
                        onTap: () {
                          controller.clear();
                          onChanged('');
                        },
                        child: Padding(
                          padding: const EdgeInsets.only(right: 10),
                          child: Icon(Icons.close_rounded,
                              size: 16, color: iconColor),
                        ),
                      )
                    : null,
                suffixIconConstraints:
                    const BoxConstraints(minWidth: 32, minHeight: 36),
                border: InputBorder.none,
                contentPadding: const EdgeInsets.symmetric(vertical: 10),
                isDense: true,
              ),
            ),
          ),
        ),
      ),
    );
  }
}

// ── Sort / filter bottom sheet ────────────────────────────────────────────────

Future<int?> showSortSheet(
  BuildContext context, {
  required String title,
  required List<String> options,
  required int current,
}) {
  return showModalBottomSheet<int>(
    context: context,
    backgroundColor: Colors.transparent,
    builder: (ctx) => _SortSheet(
      title: title,
      options: options,
      current: current,
    ),
  );
}

class _SortSheet extends StatelessWidget {
  const _SortSheet({
    required this.title,
    required this.options,
    required this.current,
  });

  final String title;
  final List<String> options;
  final int current;

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: const BoxDecoration(
        color: AppColors.surface,
        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          const SizedBox(height: 12),
          Container(
            width: 40,
            height: 4,
            decoration: BoxDecoration(
              color: AppColors.border,
              borderRadius: BorderRadius.circular(2),
            ),
          ),
          const SizedBox(height: 16),
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 20),
            child: Align(
              alignment: Alignment.centerLeft,
              child: Text(
                title,
                style: const TextStyle(
                  fontSize: 17,
                  fontWeight: FontWeight.w700,
                  color: AppColors.textPrimary,
                ),
              ),
            ),
          ),
          const SizedBox(height: 8),
          for (int i = 0; i < options.length; i++)
            ListTile(
              contentPadding:
                  const EdgeInsets.symmetric(horizontal: 20),
              title: Text(
                options[i],
                style: TextStyle(
                  color: i == current
                      ? AppColors.primary
                      : AppColors.textPrimary,
                  fontWeight: i == current
                      ? FontWeight.w600
                      : FontWeight.normal,
                ),
              ),
              trailing: i == current
                  ? const Icon(Icons.check_rounded,
                      color: AppColors.primary, size: 20)
                  : null,
              onTap: () => Navigator.pop(context, i),
            ),
          SizedBox(height: MediaQuery.paddingOf(context).bottom + 8),
        ],
      ),
    );
  }
}