import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:shadcn_ui/shadcn_ui.dart';

import 'components/page_header.dart';

/// 앱 공통 레이아웃: 브레드크럼/헤더/툴바/본문을 일관되게 배치한다.
class AppLayout extends StatelessWidget {
  const AppLayout({
    super.key,
    required this.title,
    this.subtitle,
    this.breadcrumbs = const <AppBreadcrumbItem>[],
    this.actions,
    this.toolbar,
    required this.child,
  });

  final String title;
  final String? subtitle;
  final List<AppBreadcrumbItem> breadcrumbs;
  final List<Widget>? actions;
  final Widget? toolbar;
  final Widget child;

  @override
  Widget build(BuildContext context) {
    return SelectionArea(
      child: SingleChildScrollView(
        padding: const EdgeInsets.all(24),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (breadcrumbs.isNotEmpty) ...[
              _BreadcrumbBar(items: breadcrumbs),
              const SizedBox(height: 16),
            ],
            PageHeader(title: title, subtitle: subtitle, actions: actions),
            if (toolbar != null) ...[const SizedBox(height: 16), toolbar!],
            const SizedBox(height: 24),
            child,
          ],
        ),
      ),
    );
  }
}

class AppBreadcrumbItem {
  const AppBreadcrumbItem({required this.label, this.path, this.onTap});

  final String label;
  final String? path;
  final VoidCallback? onTap;

  void navigate(BuildContext context) {
    if (path != null && path!.isNotEmpty) {
      context.go(path!);
      return;
    }
    onTap?.call();
  }
}

class _BreadcrumbBar extends StatelessWidget {
  const _BreadcrumbBar({required this.items});

  final List<AppBreadcrumbItem> items;

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);
    final colorScheme = theme.colorScheme;

    return Wrap(
      spacing: 8,
      crossAxisAlignment: WrapCrossAlignment.center,
      children: [
        for (int index = 0; index < items.length; index++) ...[
          if (index != 0)
            Icon(
              LucideIcons.chevronRight,
              size: 14,
              color: colorScheme.mutedForeground,
            ),
          _BreadcrumbChip(
            item: items[index],
            isLast: index == items.length - 1,
          ),
        ],
      ],
    );
  }
}

class _BreadcrumbChip extends StatelessWidget {
  const _BreadcrumbChip({required this.item, required this.isLast});

  final AppBreadcrumbItem item;
  final bool isLast;

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);
    final label = Text(
      item.label,
      style: theme.textTheme.small.copyWith(
        color: isLast
            ? theme.colorScheme.foreground
            : theme.colorScheme.mutedForeground,
      ),
    );

    if (isLast || (item.path == null && item.onTap == null)) {
      return label;
    }

    return InkWell(
      onTap: () => item.navigate(context),
      borderRadius: BorderRadius.circular(6),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
        child: label,
      ),
    );
  }
}