import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';

import '../core/constants/app_sections.dart';

class AppShell extends StatelessWidget {
  const AppShell({
    super.key,
    required this.child,
    required this.currentLocation,
  });

  final Widget child;
  final String currentLocation;

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final isWide = constraints.maxWidth >= 960;
        if (isWide) {
          return Scaffold(
            appBar: AppBar(
              title: const Text('Superport v2'),
              actions: [
                IconButton(
                  tooltip: '로그아웃',
                  icon: const Icon(LucideIcons.logOut),
                  onPressed: () => context.go(loginRoutePath),
                ),
              ],
            ),
            body: Row(
              children: [
                _NavigationRail(currentLocation: currentLocation),
                const VerticalDivider(width: 1),
                Expanded(child: child),
              ],
            ),
          );
        }

        return Scaffold(
          appBar: AppBar(
            title: const Text('Superport v2'),
            actions: [
              IconButton(
                tooltip: '로그아웃',
                icon: const Icon(LucideIcons.logOut),
                onPressed: () => context.go(loginRoutePath),
              ),
            ],
          ),
          drawer: Drawer(
            child: SafeArea(
              child: _NavigationList(
                currentLocation: currentLocation,
                onTap: (path) {
                  Navigator.of(context).pop();
                  context.go(path);
                },
              ),
            ),
          ),
          body: child,
        );
      },
    );
  }
}

class _NavigationRail extends StatelessWidget {
  const _NavigationRail({required this.currentLocation});

  final String currentLocation;

  @override
  Widget build(BuildContext context) {
    final pages = allAppPages;
    final selectedIndex = _selectedIndex(currentLocation, pages);
    final theme = Theme.of(context);
    final colorScheme = theme.colorScheme;

    return Container(
      width: 104,
      decoration: BoxDecoration(
        border: Border(right: BorderSide(color: colorScheme.outlineVariant)),
      ),
      child: Column(
        children: [
          const SizedBox(height: 24),
          const FlutterLogo(size: 48),
          const SizedBox(height: 24),
          Expanded(
            child: ListView.builder(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              itemCount: pages.length,
              itemBuilder: (context, index) {
                final page = pages[index];
                final isSelected = index == selectedIndex;
                final textStyle = theme.textTheme.labelSmall?.copyWith(
                  color: isSelected
                      ? colorScheme.primary
                      : colorScheme.onSurfaceVariant,
                );

                return Padding(
                  padding: const EdgeInsets.symmetric(vertical: 4),
                  child: Material(
                    color: isSelected
                        ? colorScheme.primary.withValues(alpha: 0.12)
                        : Colors.transparent,
                    borderRadius: BorderRadius.circular(12),
                    child: InkWell(
                      borderRadius: BorderRadius.circular(12),
                      onTap: () {
                        if (page.path != currentLocation) {
                          context.go(page.path);
                        }
                      },
                      child: Padding(
                        padding: const EdgeInsets.symmetric(
                          vertical: 12,
                          horizontal: 8,
                        ),
                        child: Column(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            Icon(
                              page.icon,
                              size: 22,
                              color: isSelected
                                  ? colorScheme.primary
                                  : colorScheme.onSurfaceVariant,
                            ),
                            const SizedBox(height: 6),
                            Text(
                              page.label,
                              textAlign: TextAlign.center,
                              maxLines: 2,
                              overflow: TextOverflow.ellipsis,
                              style: textStyle,
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}

class _NavigationList extends StatelessWidget {
  const _NavigationList({required this.currentLocation, required this.onTap});

  final String currentLocation;
  final ValueChanged<String> onTap;

  @override
  Widget build(BuildContext context) {
    final pages = allAppPages;
    final selectedIndex = _selectedIndex(currentLocation, pages);

    return ListView.builder(
      itemCount: pages.length,
      itemBuilder: (context, index) {
        final page = pages[index];
        final selected = index == selectedIndex;
        return ListTile(
          leading: Icon(page.icon),
          title: Text(page.label),
          subtitle: Text(
            page.summary,
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
          ),
          selected: selected,
          selectedColor: Theme.of(context).colorScheme.primary,
          onTap: () => onTap(page.path),
        );
      },
    );
  }
}

int _selectedIndex(String location, List<AppPageDescriptor> pages) {
  final normalized = location.toLowerCase();
  final exact = pages.indexWhere(
    (page) => normalized == page.path.toLowerCase(),
  );
  if (exact != -1) {
    return exact;
  }

  final prefix = pages.indexWhere(
    (page) => normalized.startsWith(page.path.toLowerCase()),
  );
  return prefix == -1 ? 0 : prefix;
}