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

import '../shared/widgets/main_app_bar_actions.dart';
import '../theme/theme_extension.dart';
import 'admin_providers.dart';
import 'widgets/admin_user_edit_sheet.dart';
import 'widgets/admin_user_row.dart';
import 'widgets/invite_row.dart';

class AdminUsersScreen extends ConsumerWidget {
  const AdminUsersScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final fs = Theme.of(context).extension<FabledSwordTheme>()!;
    final users = ref.watch(adminUsersProvider);
    final invites = ref.watch(adminInvitesProvider);
    return Scaffold(
      backgroundColor: fs.obsidian,
      appBar: AppBar(
        backgroundColor: fs.obsidian,
        elevation: 0,
        title: Text('Users', style: TextStyle(color: fs.parchment)),
        actions: const [MainAppBarActions(currentRoute: '/admin/users')],
      ),
      body: SafeArea(
        child: RefreshIndicator(
          onRefresh: () async {
            ref.invalidate(adminUsersProvider);
            ref.invalidate(adminInvitesProvider);
          },
          child: ListView(
            children: [
              const _SectionHeader(text: 'Users'),
              users.when(
                loading: () => const Padding(
                  padding: EdgeInsets.all(16),
                  child: Center(child: CircularProgressIndicator()),
                ),
                error: (e, _) => Padding(
                  padding: const EdgeInsets.all(16),
                  child: Text('$e', style: TextStyle(color: fs.error)),
                ),
                data: (rows) => Column(
                  children: rows
                      .map((u) => AdminUserRow(
                            key: Key('admin_user_row_${u.id}'),
                            user: u,
                            onTap: () => AdminUserEditSheet.show(context, u),
                          ))
                      .toList(),
                ),
              ),
              const Divider(),
              _SectionHeader(
                text: 'Invites',
                trailing: TextButton.icon(
                  key: const Key('invite_generate_button'),
                  onPressed: () => _showGenerateInvite(context, ref),
                  icon: Icon(LucideIcons.plus, color: fs.parchment),
                  label: Text('Generate',
                      style: TextStyle(color: fs.parchment)),
                ),
              ),
              invites.when(
                loading: () => const Padding(
                  padding: EdgeInsets.all(16),
                  child: Center(child: CircularProgressIndicator()),
                ),
                error: (e, _) => Padding(
                  padding: const EdgeInsets.all(16),
                  child: Text('$e', style: TextStyle(color: fs.error)),
                ),
                data: (rows) => Column(
                  children: rows
                      .map((i) => InviteRow(
                            key: Key('invite_row_${i.token}'),
                            invite: i,
                            onRevoke: () => ref
                                .read(adminInvitesProvider.notifier)
                                .revoke(i.token),
                          ))
                      .toList(),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Future<void> _showGenerateInvite(BuildContext context, WidgetRef ref) async {
    final controller = TextEditingController();
    final note = await showDialog<String?>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Generate invite'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text('Token expires in 24 hours.'),
            const SizedBox(height: 12),
            TextField(
              controller: controller,
              decoration: const InputDecoration(
                labelText: 'Note (optional)',
                helperText: 'e.g. "for alice"',
              ),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('Cancel'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(ctx, controller.text),
            child: const Text('Generate'),
          ),
        ],
      ),
    );
    if (note == null || !context.mounted) return;
    try {
      final invite = await ref
          .read(adminInvitesProvider.notifier)
          .create(note: note.isEmpty ? null : note);
      if (!context.mounted) return;
      await showDialog<void>(
        context: context,
        builder: (ctx) => AlertDialog(
          title: const Text('Invite created'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text('Share this token with the new user:'),
              const SizedBox(height: 8),
              SelectableText(
                invite.token,
                style: const TextStyle(fontFamily: 'JetBrainsMono'),
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () {
                Clipboard.setData(ClipboardData(text: invite.token));
                Navigator.pop(ctx);
              },
              child: const Text('Copy'),
            ),
            TextButton(
              onPressed: () => Navigator.pop(ctx),
              child: const Text('Close'),
            ),
          ],
        ),
      );
    } catch (e) {
      if (context.mounted) {
        ScaffoldMessenger.of(context)
            .showSnackBar(SnackBar(content: Text('$e')));
      }
    }
  }
}

class _SectionHeader extends StatelessWidget {
  const _SectionHeader({required this.text, this.trailing});
  final String text;
  final Widget? trailing;

  @override
  Widget build(BuildContext context) {
    final fs = Theme.of(context).extension<FabledSwordTheme>()!;
    return Padding(
      padding: const EdgeInsets.fromLTRB(16, 16, 16, 8),
      child: Row(
        children: [
          Text(
            text,
            style: TextStyle(
              color: fs.parchment,
              fontFamily: 'Fraunces',
              fontSize: 18,
            ),
          ),
          const Spacer(),
          if (trailing != null) trailing!,
        ],
      ),
    );
  }
}