import 'package:flutter/material.dart';

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

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

  @override
  State<ModulesPage> createState() => _ModulesPageState();
}

class _ModulesPageState extends State<ModulesPage> {
  late Future<List<ModuleSummary>> _future;

  @override
  void initState() {
    super.initState();
    _future = HubService.instance.listModules();
  }

  void _refresh() => setState(() {
        _future = HubService.instance.listModules();
      });

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
      appBar: AppBar(
        title: const Text('Modules'),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh, size: 18),
            tooltip: 'Reload',
            onPressed: _refresh,
          ),
          const SizedBox(width: FaiSpace.sm),
        ],
      ),
      body: FutureBuilder<List<ModuleSummary>>(
        future: _future,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }
          if (snapshot.hasError) {
            return FaiEmptyState(
              icon: Icons.cloud_off_outlined,
              iconColor: Theme.of(context).colorScheme.error,
              title: 'Hub unreachable',
              hint:
                  'Start the hub with `fai serve`. Studio will retry automatically.',
              action: FilledButton.tonal(
                onPressed: _refresh,
                child: const Text('Retry'),
              ),
            );
          }
          final modules = snapshot.data ?? [];
          if (modules.isEmpty) {
            return const FaiEmptyState(
              icon: Icons.extension_outlined,
              title: 'No modules yet',
              hint:
                  'Run `fai install <capability-name>` or check ~/.fai/modules/.',
            );
          }
          return ListView.separated(
            padding: const EdgeInsets.all(FaiSpace.xl),
            itemCount: modules.length,
            separatorBuilder: (_, _) => const SizedBox(height: FaiSpace.md),
            itemBuilder: (context, i) => _ModuleCard(module: modules[i]),
          );
        },
      ),
    );
  }
}

class _ModuleCard extends StatelessWidget {
  final ModuleSummary module;

  const _ModuleCard({required this.module});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return FaiCard(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Text(
                module.name,
                style: theme.textTheme.titleMedium?.copyWith(
                  fontWeight: FontWeight.w600,
                ),
              ),
              const SizedBox(width: FaiSpace.sm),
              FaiPill(
                label: 'v${module.version}',
                tone: FaiPillTone.neutral,
                monospace: true,
              ),
            ],
          ),
          const SizedBox(height: FaiSpace.md),
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              SizedBox(
                width: 110,
                child: Text(
                  'Capabilities',
                  style: theme.textTheme.labelSmall?.copyWith(
                    color: theme.colorScheme.onSurfaceVariant,
                    letterSpacing: 0.4,
                  ),
                ),
              ),
              Expanded(
                child: Wrap(
                  spacing: FaiSpace.xs,
                  runSpacing: FaiSpace.xs,
                  children: module.capabilities
                      .map(
                        (c) => FaiPill(
                          label: c,
                          tone: FaiPillTone.accent,
                          monospace: true,
                        ),
                      )
                      .toList(),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}