import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../models/nymea_models.dart';
import '../models/thing_category.dart';
import '../services/nymea_service.dart';
import '../theme/app_theme.dart';
import 'thing_detail_screen.dart';

// ─────────────────────────────────────────────────────────────────────────────
//  CategoryOverviewScreen — NIVEAU 2
//
//  Liste des things d'une catégorie.
//  Reproduit smart-meters_overview.png (nymea-app) :
//
//  AppBar : ‹  [NOM CATÉGORIE]  (centré)
//
//  Pour chaque thing :
//  ┌─────────────────────────────────────┐
//  │  Nom du thing (bold)         ●      │  ← fond coloré léger
//  ├─────────────────────────────────────┤
//  │  [icône]  Classe appareil   valeur ›│  ← fond blanc
//  └─────────────────────────────────────┘
// ─────────────────────────────────────────────────────────────────────────────

class CategoryOverviewScreen extends StatelessWidget {
  final ThingCategoryInfo info;
  final List<NymeaThing> things;
  final List<NymeaThingClass> thingClasses;

  const CategoryOverviewScreen({
    super.key,
    required this.info,
    required this.things,
    required this.thingClasses,
  });

  // ── Helpers ────────────────────────────────────────────────────────────────

  NymeaThingClass? _cls(NymeaThing t) {
    try {
      return thingClasses.firstWhere((c) => c.id == t.thingClassId);
    } catch (_) {
      return null;
    }
  }

  bool _isOnline(NymeaThing t, NymeaThingClass? cls) {
    final ct =
        cls?.stateTypes.where((s) => s.name.toLowerCase() == 'connected');
    if (ct != null && ct.isNotEmpty) {
      final v = t.stateValue(ct.first.id);
      return v == true || v == 'true';
    }
    return t.isSetupComplete;
  }

  String? _primaryValue(NymeaThing t, NymeaThingClass? cls) {
    final p = cls?.primaryStateType;
    if (p == null) return null;
    return p.formatValue(t.stateValue(p.id));
  }

  // ── Build ──────────────────────────────────────────────────────────────────

  @override
  Widget build(BuildContext context) {
    // Écoute les mises à jour live via le service
    final service = context.watch<NymeaService>();
    final liveThings = things.map((t) {
      try {
        return service.things.firstWhere((lt) => lt.id == t.id);
      } catch (_) {
        return t;
      }
    }).toList();

    return Scaffold(
      backgroundColor: AppTheme.backgroundGray,
      appBar: AppBar(
        backgroundColor: AppTheme.backgroundGray,
        elevation: 0,
        centerTitle: true,
        leading: IconButton(
          icon: const Icon(Icons.chevron_left,
              color: AppTheme.textDark, size: 30),
          onPressed: () => Navigator.pop(context),
        ),
        title: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(info.icon, color: info.color, size: 20),
            const SizedBox(width: 8),
            Text(
              info.label,
              style: const TextStyle(
                  color: AppTheme.textDark,
                  fontWeight: FontWeight.bold,
                  fontSize: 18),
            ),
          ],
        ),
      ),
      body: ListView.separated(
        padding: const EdgeInsets.fromLTRB(16, 12, 16, 60),
        itemCount: liveThings.length,
        separatorBuilder: (context, i) => const SizedBox(height: 10),
        itemBuilder: (context, i) {
          final t = liveThings[i];
          final cls = _cls(t);
          return _ThingListCard(
            thing: t,
            thingClass: cls,
            info: info,
            isOnline: _isOnline(t, cls),
            primaryValue: _primaryValue(t, cls),
            onTap: () => Navigator.push(
              context,
              MaterialPageRoute(builder: (_) => ThingDetailScreen(thing: t)),
            ),
          );
        },
      ),
    );
  }
}

// ─────────────────────────────────────────────────────────────────────────────
//  _ThingListCard — Card deux lignes style nymea
// ─────────────────────────────────────────────────────────────────────────────

class _ThingListCard extends StatelessWidget {
  final NymeaThing thing;
  final NymeaThingClass? thingClass;
  final ThingCategoryInfo info;
  final bool isOnline;
  final String? primaryValue;
  final VoidCallback onTap;

  const _ThingListCard({
    required this.thing,
    required this.thingClass,
    required this.info,
    required this.isOnline,
    required this.primaryValue,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return ClipRRect(
      borderRadius: BorderRadius.circular(AppTheme.cornerRadius),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: onTap,
          child: Container(
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(AppTheme.cornerRadius),
              border: Border.all(
                  color: info.color.withValues(alpha: 0.28), width: 1),
            ),
            child: Column(
              children: [
                // ── Ligne 1 : nom du thing ─────────────────────────────────
                Container(
                  decoration: BoxDecoration(
                    color: info.color.withValues(alpha: 0.10),
                    borderRadius: const BorderRadius.vertical(
                        top: Radius.circular(9)),
                  ),
                  padding: const EdgeInsets.symmetric(
                      horizontal: 16, vertical: 11),
                  child: Row(
                    children: [
                      Expanded(
                        child: Text(
                          thing.name,
                          style: const TextStyle(
                              fontSize: 15,
                              fontWeight: FontWeight.bold,
                              color: AppTheme.textDark),
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                        ),
                      ),
                      // Pastille statut
                      Container(
                        width: 9,
                        height: 9,
                        decoration: BoxDecoration(
                          color:
                              isOnline ? info.color : Colors.grey[400],
                          shape: BoxShape.circle,
                          boxShadow: isOnline
                              ? [
                                  BoxShadow(
                                    color: info.color
                                        .withValues(alpha: 0.45),
                                    blurRadius: 4,
                                  )
                                ]
                              : null,
                        ),
                      ),
                    ],
                  ),
                ),

                // ── Ligne 2 : icône + classe + valeur primaire ─────────────
                Container(
                  color: AppTheme.cardWhite,
                  padding: const EdgeInsets.symmetric(
                      horizontal: 16, vertical: 12),
                  child: Row(
                    children: [
                      // Icône
                      Container(
                        width: 32,
                        height: 32,
                        decoration: BoxDecoration(
                          color: info.color
                              .withValues(alpha: isOnline ? 0.12 : 0.06),
                          borderRadius: BorderRadius.circular(8),
                        ),
                        child: Icon(
                          info.icon,
                          size: 18,
                          color: isOnline
                              ? info.color
                              : info.color.withValues(alpha: 0.4),
                        ),
                      ),
                      const SizedBox(width: 12),

                      // Classe appareil
                      Expanded(
                        child: Text(
                          thingClass?.displayName ?? 'Appareil',
                          style: const TextStyle(
                              fontSize: 13, color: AppTheme.textLight),
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                        ),
                      ),

                      // Valeur primaire
                      Text(
                        primaryValue ?? '—',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                          color: isOnline
                              ? info.color
                              : AppTheme.textLight,
                        ),
                      ),
                      const SizedBox(width: 4),

                      // Flèche
                      const Icon(Icons.chevron_right,
                          size: 18, color: AppTheme.textLight),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}