import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../../shared/services/api_client.dart';
import '../../../shared/providers/auth_provider.dart';

final clientsProvider = FutureProvider.autoDispose
    .family<List<Map<String, dynamic>>, String?>((ref, search) async {
  final apiClient = ref.watch(apiClientProvider);
  return apiClient.getClients(search: search);
});

class ClientsScreen extends ConsumerStatefulWidget {
  const ClientsScreen({super.key});

  @override
  ConsumerState<ClientsScreen> createState() => _ClientsScreenState();
}

class _ClientsScreenState extends ConsumerState<ClientsScreen> {
  final _searchController = TextEditingController();
  String? _searchQuery;

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

  @override
  Widget build(BuildContext context) {
    final clientsAsync = ref.watch(clientsProvider(_searchQuery));
    
    return Scaffold(
      appBar: AppBar(
        title: const Text('Clients'),
        actions: [
          IconButton(
            icon: const Icon(Icons.logout),
            onPressed: () async {
              await ref.read(authStateProvider.notifier).signOut();
            },
          ),
        ],
      ),
      body: Column(
        children: [
          // Search bar
          Padding(
            padding: const EdgeInsets.all(16),
            child: TextField(
              controller: _searchController,
              decoration: InputDecoration(
                hintText: 'Search clients...',
                prefixIcon: const Icon(Icons.search),
                suffixIcon: _searchQuery != null
                    ? IconButton(
                        icon: const Icon(Icons.clear),
                        onPressed: () {
                          _searchController.clear();
                          setState(() {
                            _searchQuery = null;
                          });
                        },
                      )
                    : null,
              ),
              onSubmitted: (value) {
                setState(() {
                  _searchQuery = value.isEmpty ? null : value;
                });
              },
            ),
          ),
          
          // Client list
          Expanded(
            child: clientsAsync.when(
              data: (clients) {
                if (clients.isEmpty) {
                  return Center(
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Icon(
                          Icons.people_outline,
                          size: 64,
                          color: Colors.grey.shade400,
                        ),
                        const SizedBox(height: 16),
                        Text(
                          _searchQuery != null
                              ? 'No clients found'
                              : 'No clients yet',
                          style: Theme.of(context).textTheme.titleMedium?.copyWith(
                            color: Colors.grey,
                          ),
                        ),
                        const SizedBox(height: 8),
                        if (_searchQuery == null)
                          FilledButton.icon(
                            onPressed: () => context.go('/clients/new'),
                            icon: const Icon(Icons.add),
                            label: const Text('Add Client'),
                          ),
                      ],
                    ),
                  );
                }
                
                return RefreshIndicator(
                  onRefresh: () async {
                    ref.invalidate(clientsProvider(_searchQuery));
                  },
                  child: ListView.builder(
                    padding: const EdgeInsets.symmetric(horizontal: 16),
                    itemCount: clients.length,
                    itemBuilder: (context, index) {
                      final client = clients[index];
                      return _ClientCard(client: client);
                    },
                  ),
                );
              },
              loading: () => const Center(
                child: CircularProgressIndicator(),
              ),
              error: (error, stack) => Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Icon(
                      Icons.error_outline,
                      size: 64,
                      color: Colors.red.shade300,
                    ),
                    const SizedBox(height: 16),
                    Text(
                      'Failed to load clients',
                      style: Theme.of(context).textTheme.titleMedium,
                    ),
                    const SizedBox(height: 8),
                    TextButton(
                      onPressed: () {
                        ref.invalidate(clientsProvider(_searchQuery));
                      },
                      child: const Text('Retry'),
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => context.go('/clients/new'),
        child: const Icon(Icons.add),
      ),
    );
  }
}

class _ClientCard extends StatelessWidget {
  final Map<String, dynamic> client;
  
  const _ClientCard({required this.client});
  
  @override
  Widget build(BuildContext context) {
    final name = '${client['firstName']} ${client['lastName']}';
    final company = client['company'] as String?;
    final tags = (client['tags'] as List?)?.cast<String>() ?? [];
    
    return Card(
      margin: const EdgeInsets.only(bottom: 12),
      child: InkWell(
        onTap: () => context.go('/clients/${client['id']}'),
        borderRadius: BorderRadius.circular(12),
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Row(
            children: [
              CircleAvatar(
                backgroundColor: Theme.of(context).colorScheme.primaryContainer,
                child: Text(
                  '${client['firstName'][0]}${client['lastName'][0]}',
                  style: TextStyle(
                    color: Theme.of(context).colorScheme.onPrimaryContainer,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
              const SizedBox(width: 16),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      name,
                      style: Theme.of(context).textTheme.titleMedium?.copyWith(
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                    if (company != null && company.isNotEmpty) ...[
                      const SizedBox(height: 2),
                      Text(
                        company,
                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                          color: Colors.grey,
                        ),
                      ),
                    ],
                    if (tags.isNotEmpty) ...[
                      const SizedBox(height: 8),
                      Wrap(
                        spacing: 4,
                        runSpacing: 4,
                        children: tags.take(3).map((tag) => Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 8,
                            vertical: 2,
                          ),
                          decoration: BoxDecoration(
                            color: Theme.of(context).colorScheme.secondaryContainer,
                            borderRadius: BorderRadius.circular(12),
                          ),
                          child: Text(
                            tag,
                            style: Theme.of(context).textTheme.labelSmall?.copyWith(
                              color: Theme.of(context).colorScheme.onSecondaryContainer,
                            ),
                          ),
                        )).toList(),
                      ),
                    ],
                  ],
                ),
              ),
              Icon(
                Icons.chevron_right,
                color: Colors.grey.shade400,
              ),
            ],
          ),
        ),
      ),
    );
  }
}