// Store browser. Lists modules from the hub's bundled
// store-index, with category + status filters and a one-click
// install action. Mirrors `fai store search` on the CLI side.

import 'package:flutter/material.dart';

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

class StorePage extends StatefulWidget {
  const StorePage({super.key});

  @override
  State<StorePage> createState() => _StorePageState();
}

class _StorePageState extends State<StorePage> {
  final _queryCtrl = TextEditingController();
  String _category = '';
  String _status = '';
  late Future<List<StoreItem>> _future;

  @override
  void initState() {
    super.initState();
    _future = _load();
  }

  @override
  void dispose() {
    _queryCtrl.dispose();
    super.dispose();
  }

  Future<List<StoreItem>> _load() {
    return HubService.instance.searchStore(
      query: _queryCtrl.text.trim(),
      category: _category,
      status: _status,
    );
  }

  void _runSearch() => setState(() => _future = _load());

  Future<void> _install(StoreItem item) async {
    // The store entry doesn't carry the bundle URL; for Phase 0.5
    // we prompt the operator for the source (URL or local path).
    // Future store entries will include `download_url` per
    // platform.
    final source = await _SourcePromptDialog.show(context, item);
    if (source == null || source.isEmpty) return;
    if (!mounted) return;

    showDialog<void>(
      context: context,
      barrierDismissible: false,
      builder: (_) => _InstallProgressDialog(item: item, source: source),
    ).then((_) => _runSearch());
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Scaffold(
      backgroundColor: theme.scaffoldBackgroundColor,
      appBar: AppBar(
        title: const Text('Store'),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh, size: 18),
            tooltip: 'Reload',
            onPressed: _runSearch,
          ),
          const SizedBox(width: FaiSpace.sm),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(FaiSpace.xl),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _SearchBar(
              controller: _queryCtrl,
              category: _category,
              status: _status,
              onCategoryChanged: (v) {
                setState(() => _category = v);
                _runSearch();
              },
              onStatusChanged: (v) {
                setState(() => _status = v);
                _runSearch();
              },
              onSubmit: _runSearch,
            ),
            const SizedBox(height: FaiSpace.lg),
            Expanded(
              child: FutureBuilder<List<StoreItem>>(
                future: _future,
                builder: (context, snap) {
                  if (snap.connectionState == ConnectionState.waiting) {
                    return const Center(child: CircularProgressIndicator());
                  }
                  if (snap.hasError) {
                    return FaiEmptyState(
                      icon: Icons.cloud_off_outlined,
                      iconColor: theme.colorScheme.error,
                      title: 'Hub unreachable',
                      hint: 'Start the hub with `fai daemon start`.',
                      action: FilledButton.tonal(
                        onPressed: _runSearch,
                        child: const Text('Retry'),
                      ),
                    );
                  }
                  final items = snap.data ?? const [];
                  if (items.isEmpty) {
                    return const FaiEmptyState(
                      icon: Icons.store_outlined,
                      title: 'No matches',
                      hint:
                          'Adjust the filters or clear the search to see all entries.',
                    );
                  }
                  return ListView.separated(
                    padding: EdgeInsets.zero,
                    itemCount: items.length,
                    separatorBuilder: (_, _) =>
                        const SizedBox(height: FaiSpace.md),
                    itemBuilder: (context, i) =>
                        _StoreCard(item: items[i], onInstall: () => _install(items[i])),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class _SearchBar extends StatelessWidget {
  final TextEditingController controller;
  final String category;
  final String status;
  final void Function(String) onCategoryChanged;
  final void Function(String) onStatusChanged;
  final VoidCallback onSubmit;

  const _SearchBar({
    required this.controller,
    required this.category,
    required this.status,
    required this.onCategoryChanged,
    required this.onStatusChanged,
    required this.onSubmit,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Expanded(
          child: TextField(
            controller: controller,
            decoration: const InputDecoration(
              prefixIcon: Icon(Icons.search, size: 18),
              hintText: 'search name, tagline, tag…',
              border: OutlineInputBorder(),
              isDense: true,
            ),
            onSubmitted: (_) => onSubmit(),
          ),
        ),
        const SizedBox(width: FaiSpace.md),
        _DropdownFilter(
          label: 'Category',
          value: category,
          options: const ['', 'llm', 'text', 'system', 'orchestrator'],
          onChanged: onCategoryChanged,
        ),
        const SizedBox(width: FaiSpace.md),
        _DropdownFilter(
          label: 'Status',
          value: status,
          options: const ['', 'published', 'alpha', 'planned'],
          onChanged: onStatusChanged,
        ),
      ],
    );
  }
}

class _DropdownFilter extends StatelessWidget {
  final String label;
  final String value;
  final List<String> options;
  final void Function(String) onChanged;

  const _DropdownFilter({
    required this.label,
    required this.value,
    required this.options,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: 160,
      child: DropdownButtonFormField<String>(
        initialValue: value,
        isDense: true,
        decoration: InputDecoration(
          labelText: label,
          border: const OutlineInputBorder(),
          isDense: true,
        ),
        items: options
            .map(
              (o) => DropdownMenuItem(
                value: o,
                child: Text(o.isEmpty ? 'any' : o),
              ),
            )
            .toList(),
        onChanged: (v) => onChanged(v ?? ''),
      ),
    );
  }
}

class _StoreCard extends StatelessWidget {
  final StoreItem item;
  final VoidCallback onInstall;

  const _StoreCard({required this.item, required this.onInstall});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return FaiCard(
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Icon(
            item.installed ? Icons.check_circle_outline : Icons.extension_outlined,
            size: 20,
            color: item.installed
                ? FaiColors.success
                : theme.colorScheme.primary,
          ),
          const SizedBox(width: FaiSpace.md),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Text(
                      item.name,
                      style: theme.textTheme.titleMedium?.copyWith(
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                    const SizedBox(width: FaiSpace.sm),
                    if (item.bestVersion.isNotEmpty)
                      FaiPill(
                        label: 'v${item.bestVersion}',
                        tone: FaiPillTone.neutral,
                        monospace: true,
                      ),
                    const SizedBox(width: FaiSpace.xs),
                    if (item.status.isNotEmpty)
                      FaiPill(
                        label: item.status,
                        tone: _toneForStatus(item.status),
                      ),
                  ],
                ),
                if (item.taglineEn.isNotEmpty) ...[
                  const SizedBox(height: 2),
                  Text(
                    item.taglineEn,
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: theme.colorScheme.onSurfaceVariant,
                    ),
                  ),
                ],
                const SizedBox(height: FaiSpace.xs),
                Wrap(
                  spacing: FaiSpace.xs,
                  runSpacing: FaiSpace.xs,
                  children: [
                    if (item.category.isNotEmpty)
                      FaiPill(
                        label: item.category,
                        tone: FaiPillTone.neutral,
                      ),
                    for (final t in item.tags.take(4))
                      FaiPill(label: t, tone: FaiPillTone.neutral),
                  ],
                ),
              ],
            ),
          ),
          const SizedBox(width: FaiSpace.md),
          if (item.installed)
            FilledButton.tonalIcon(
              onPressed: null,
              icon: const Icon(Icons.check, size: 16),
              label: const Text('Installed'),
            )
          else
            FilledButton.icon(
              onPressed: onInstall,
              icon: const Icon(Icons.download, size: 16),
              label: const Text('Install'),
            ),
        ],
      ),
    );
  }

  FaiPillTone _toneForStatus(String s) {
    switch (s) {
      case 'published':
        return FaiPillTone.success;
      case 'alpha':
        return FaiPillTone.warning;
      case 'planned':
        return FaiPillTone.neutral;
      default:
        return FaiPillTone.neutral;
    }
  }
}

class _SourcePromptDialog extends StatefulWidget {
  final StoreItem item;

  const _SourcePromptDialog({required this.item});

  static Future<String?> show(BuildContext context, StoreItem item) {
    return showDialog<String>(
      context: context,
      builder: (_) => _SourcePromptDialog(item: item),
    );
  }

  @override
  State<_SourcePromptDialog> createState() => _SourcePromptDialogState();
}

class _SourcePromptDialogState extends State<_SourcePromptDialog> {
  final _ctrl = TextEditingController();

  @override
  void dispose() {
    _ctrl.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return AlertDialog(
      title: Text('Install ${widget.item.name}'),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(FaiRadius.md),
      ),
      content: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 480),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              'The store index does not yet ship binary URLs. Paste the '
              '`.fai` bundle source — a https URL or a local filesystem '
              'path — and the hub will fetch + verify + unpack.',
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
            const SizedBox(height: FaiSpace.md),
            TextField(
              controller: _ctrl,
              autofocus: true,
              style: FaiTheme.mono(size: 12),
              decoration: const InputDecoration(
                labelText: 'source',
                hintText: 'https://… or /path/to/bundle.fai',
                border: OutlineInputBorder(),
                isDense: true,
              ),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context, null),
          child: const Text('Cancel'),
        ),
        FilledButton.icon(
          icon: const Icon(Icons.download, size: 16),
          label: const Text('Install'),
          onPressed: () => Navigator.pop(context, _ctrl.text.trim()),
        ),
      ],
    );
  }
}

class _InstallProgressDialog extends StatefulWidget {
  final StoreItem item;
  final String source;

  const _InstallProgressDialog({required this.item, required this.source});

  @override
  State<_InstallProgressDialog> createState() => _InstallProgressDialogState();
}

class _InstallProgressDialogState extends State<_InstallProgressDialog> {
  late final Future<({String name, String version})> _future;

  @override
  void initState() {
    super.initState();
    _future = HubService.instance.installModule(source: widget.source);
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return AlertDialog(
      title: Text('Installing ${widget.item.name}'),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(FaiRadius.md),
      ),
      content: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 480, maxHeight: 360),
        child: FutureBuilder<({String name, String version})>(
          future: _future,
          builder: (context, snap) {
            if (snap.connectionState == ConnectionState.waiting) {
              return Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  const SizedBox(height: FaiSpace.md),
                  const CircularProgressIndicator(),
                  const SizedBox(height: FaiSpace.md),
                  Text(
                    'Fetching, verifying, unpacking…',
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: theme.colorScheme.onSurfaceVariant,
                    ),
                  ),
                ],
              );
            }
            if (snap.hasError) {
              return SingleChildScrollView(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Icon(
                      Icons.error_outline,
                      color: theme.colorScheme.error,
                      size: 32,
                    ),
                    const SizedBox(height: FaiSpace.md),
                    SelectableText(
                      snap.error.toString(),
                      style: FaiTheme.mono(
                        size: 11,
                        color: theme.colorScheme.error,
                      ),
                    ),
                  ],
                ),
              );
            }
            final r = snap.data!;
            return Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Icon(
                  Icons.check_circle_outline,
                  size: 32,
                  color: FaiColors.success,
                ),
                const SizedBox(height: FaiSpace.md),
                Text(
                  '${r.name} v${r.version} installed.',
                  style: theme.textTheme.titleMedium,
                ),
              ],
            );
          },
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context),
          child: const Text('Close'),
        ),
      ],
    );
  }
}