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

import '../../state/ai_providers.dart';
import '../../state/providers.dart';
import 'chat_screen.dart';
import 'check_in_screen.dart';
import 'habit_create_screen.dart';
import 'protocol_gallery_screen.dart';
import 'settings_screen.dart';
import 'streak_screen.dart';

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

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final boot = ref.watch(bootstrapProvider);
    final habitsAsync = ref.watch(activeHabitsProvider);
    final aiOptIn = ref.watch(aiSettingsProvider).valueOrNull ?? false;

    return Scaffold(
      appBar: AppBar(
        title: const Text('습관'),
        actions: [
          if (aiOptIn)
            IconButton(
              icon: const Icon(Icons.smart_toy_outlined),
              tooltip: 'AI 코치',
              onPressed: () {
                Navigator.of(context).push(MaterialPageRoute(
                  builder: (_) => const ChatScreen(),
                ));
              },
            ),
          IconButton(
            icon: const Icon(Icons.search),
            tooltip: '카탈로그 탐색',
            onPressed: () => _openGallery(context),
          ),
          IconButton(
            icon: const Icon(Icons.settings),
            tooltip: '설정',
            onPressed: () {
              Navigator.of(context).push(MaterialPageRoute(
                builder: (_) => const SettingsScreen(),
              ));
            },
          ),
        ],
      ),
      body: boot.when(
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (e, st) => Center(child: Text('초기화 실패: $e')),
        data: (_) => habitsAsync.when(
          loading: () => const Center(child: CircularProgressIndicator()),
          error: (e, st) => Center(child: Text('로드 실패: $e')),
          data: (habits) {
            if (habits.isEmpty) {
              return Center(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    const Padding(
                      padding: EdgeInsets.symmetric(horizontal: 24),
                      child: Text(
                        '아직 습관이 없습니다.\n+ 버튼으로 추가하거나, 카탈로그에서 골라보세요.',
                        textAlign: TextAlign.center,
                      ),
                    ),
                    const SizedBox(height: 16),
                    FilledButton.icon(
                      onPressed: () => _openGallery(context),
                      icon: const Icon(Icons.search),
                      label: const Text('🔍 카탈로그 탐색'),
                    ),
                  ],
                ),
              );
            }
            return ListView.separated(
              itemCount: habits.length,
              separatorBuilder: (_, _) => const Divider(height: 1),
              itemBuilder: (context, i) {
                final h = habits[i];
                return ListTile(
                  title: Text(h.title),
                  subtitle: Text(
                    '${h.type} · ${h.frameLevel} · ${h.frameFramedText}',
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                  ),
                  trailing: IconButton(
                    icon: const Icon(Icons.show_chart),
                    onPressed: () {
                      Navigator.of(context).push(MaterialPageRoute(
                        builder: (_) => StreakScreen(habitId: h.id),
                      ));
                    },
                  ),
                  onTap: () {
                    Navigator.of(context).push(MaterialPageRoute(
                      builder: (_) => CheckInScreen(habitId: h.id),
                    ));
                  },
                );
              },
            );
          },
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.of(context).push(MaterialPageRoute(
            builder: (_) => const HabitCreateScreen(),
          ));
        },
        child: const Icon(Icons.add),
      ),
    );
  }

  void _openGallery(BuildContext context) {
    Navigator.of(context).push(MaterialPageRoute(
      builder: (_) => const ProtocolGalleryScreen(),
    ));
  }
}