// Module-store manager — list the configured module stores (+ the
// bundled seed), add a store by index URL, or remove one. The hub merges
// every store's modules into one searchable index, so adding a store
// (e.g. a domain app's published modules) makes them appear in the Store.

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

import '../data/error_presentation.dart';
import '../data/hub.dart';
import '../theme/tokens.dart';

class ChainStoresDialog extends StatefulWidget {
  const ChainStoresDialog._();

  static Future<void> show(BuildContext context) => showDialog(
        context: context,
        builder: (_) => const ChainStoresDialog._(),
      );

  @override
  State<ChainStoresDialog> createState() => _ChainStoresDialogState();
}

class _ChainStoresDialogState extends State<ChainStoresDialog> {
  late Future<List<StoreSource>> _future;
  final _name = TextEditingController();
  final _url = TextEditingController();
  bool _busy = false;

  @override
  void initState() {
    super.initState();
    _reload();
  }

  void _reload() =>
      setState(() => _future = HubService.instance.listStores());

  @override
  void dispose() {
    _name.dispose();
    _url.dispose();
    super.dispose();
  }

  Future<void> _add() async {
    final name = _name.text.trim();
    final url = _url.text.trim();
    if (name.isEmpty || url.isEmpty) return;
    setState(() => _busy = true);
    try {
      final r = await HubService.instance.addStore(name: name, url: url);
      if (!mounted) return;
      _name.clear();
      _url.clear();
      ScaffoldMessenger.of(context)
          .showSnackBar(SnackBar(content: Text(r.message)));
      _reload();
    } catch (e) {
      if (mounted) {
        showFaiErrorSnack(context, 'store.add', e,
            title: 'Could not add store');
      }
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  Future<void> _remove(String name) async {
    try {
      final r = await HubService.instance.removeStore(name);
      if (!mounted) return;
      ScaffoldMessenger.of(context)
          .showSnackBar(SnackBar(content: Text(r.message)));
      _reload();
    } catch (e) {
      if (mounted) {
        showFaiErrorSnack(context, 'store.remove', e,
            title: 'Could not remove store');
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return AlertDialog(
      title: const Text('Module stores'),
      content: SizedBox(
        width: 540,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Text(
              'The hub merges modules from every store below into one index. '
              'Add a store index URL to make its modules installable here.',
              style: theme.textTheme.bodySmall
                  ?.copyWith(color: theme.colorScheme.onSurfaceVariant),
            ),
            const SizedBox(height: ChainSpace.md),
            Flexible(
              child: FutureBuilder<List<StoreSource>>(
                future: _future,
                builder: (c, snap) {
                  if (snap.connectionState == ConnectionState.waiting) {
                    return const Padding(
                      padding: EdgeInsets.all(16),
                      child: Center(child: CircularProgressIndicator()),
                    );
                  }
                  final stores = snap.data ?? const <StoreSource>[];
                  return ListView(
                    shrinkWrap: true,
                    children: [
                      for (final s in stores)
                        ListTile(
                          dense: true,
                          leading: Icon(
                            s.removable
                                ? Icons.cloud_outlined
                                : Icons.inventory_2_outlined,
                            size: 18,
                          ),
                          title: Text(s.name),
                          subtitle: Text(
                            s.url.isEmpty
                                ? '${s.moduleCount} modules · bundled'
                                : '${s.url}\n${s.moduleCount} modules',
                          ),
                          isThreeLine: s.url.isNotEmpty,
                          trailing: s.removable
                              ? IconButton(
                                  icon: const Icon(Icons.delete_outline),
                                  tooltip: 'Remove',
                                  onPressed: () => _remove(s.name),
                                )
                              : const Icon(Icons.lock_outline, size: 16),
                        ),
                    ],
                  );
                },
              ),
            ),
            const Divider(),
            Text('Add a store', style: theme.textTheme.titleSmall),
            const SizedBox(height: ChainSpace.sm),
            Row(
              children: [
                Expanded(
                  flex: 2,
                  child: TextField(
                    controller: _name,
                    decoration: const InputDecoration(
                      labelText: 'Name',
                      isDense: true,
                    ),
                  ),
                ),
                const SizedBox(width: ChainSpace.sm),
                Expanded(
                  flex: 4,
                  child: TextField(
                    controller: _url,
                    decoration: const InputDecoration(
                      labelText: 'Index URL (https:// or file://)',
                      isDense: true,
                    ),
                    onSubmitted: (_) => _add(),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('Close'),
        ),
        FilledButton(
          onPressed: _busy ? null : _add,
          child: _busy
              ? const SizedBox(
                  width: 16,
                  height: 16,
                  child: CircularProgressIndicator(strokeWidth: 2),
                )
              : const Text('Add store'),
        ),
      ],
    );
  }
}