import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:manager_api_new/api.dart';
import 'package:manager_app/app_context.dart';
import 'package:manager_app/constants.dart';
import 'package:manager_app/l10n/app_localizations.dart';
import 'package:manager_app/Models/managerContext.dart';
import 'package:manager_app/Screens/GuideIa/visitor_questions_tab.dart';
import 'package:provider/provider.dart';

/// Voix Gemini TTS retenues. Voix et mot de réveil forment un couple indissociable :
/// les mots de réveil sont des modèles OpenWakeWord pré-entraînés, pas des chaînes saisies.
const kGuideVoiceViva = 'Sulafat';
const kGuideVoiceMarco = 'Umbriel';

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

  @override
  State<GuideIaScreen> createState() => _GuideIaScreenState();
}

class _GuideIaScreenState extends State<GuideIaScreen> {
  final _nameController = TextEditingController();
  final _personaController = TextEditingController();
  final List<TextEditingController> _fallbackControllers = [];

  String _voiceId = kGuideVoiceViva;
  InstanceDTO? _instance;
  bool _loading = true;
  bool _saving = false;
  bool _reindexing = false;

  int _tab = 0;

  final _previewController = TextEditingController();
  final List<_PreviewTurn> _previewTurns = [];
  bool _previewPending = false;

  GuideIaInsights? _insights;

  Map<String, dynamic>? _knowledge;

  /// Nul tant que le serveur n'a pas répondu : la ligne « ~N questions » ne s'affiche pas.
  int? _tokensPerQuestion;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) => _load());
  }

  @override
  void dispose() {
    _nameController.dispose();
    _personaController.dispose();
    _previewController.dispose();
    for (final c in _fallbackControllers) {
      c.dispose();
    }
    super.dispose();
  }

  ManagerAppContext get _managerContext =>
      Provider.of<AppContext>(context, listen: false).getContext() as ManagerAppContext;

  /// Langue dans laquelle le gestionnaire saisit ses messages de repli.
  /// Les autres langues sont produites par la traduction automatique, comme le reste du contenu.
  String get _editingLanguage => 'FR';

  Future<void> _load() async {
    final ctx = _managerContext;
    final instanceId = ctx.instanceId;
    if (instanceId == null || ctx.clientAPI == null) {
      setState(() => _loading = false);
      return;
    }

    try {
      final instance = await ctx.clientAPI!.instanceApi!.instanceGetDetail(instanceId);
      if (!mounted) return;

      _nameController.text = instance?.guideName ?? '';
      _personaController.text = instance?.guidePersonaPrompt ?? '';
      _voiceId = instance?.guideVoiceId ?? kGuideVoiceViva;

      final ownLanguage = (instance?.guideFallbackMessages ?? [])
          .where((m) => m.language == _editingLanguage && (m.value ?? '').isNotEmpty);
      for (final m in ownLanguage) {
        _fallbackControllers.add(TextEditingController(text: m.value));
      }
      if (_fallbackControllers.isEmpty) {
        _fallbackControllers.add(TextEditingController());
      }

      setState(() {
        _instance = instance;
        _loading = false;
      });
      _loadKnowledge();
      _loadInsights();
      _loadTokensPerQuestion();
    } catch (_) {
      if (mounted) setState(() => _loading = false);
    }
  }

  /// Appel http direct, comme la relance d'indexation plus bas : un agrégat en lecture
  /// seule ne justifie pas d'étendre `manager_api_new`, qui s'édite à la main.
  /// Un échec est silencieux — la carte disparaît, elle n'affiche pas un chiffre faux.
  Future<void> _loadKnowledge() async {
    final ctx = _managerContext;
    try {
      final response = await http.get(
        Uri.parse('${ctx.host}/api/Ai/knowledge/${ctx.instanceId}'),
        headers: {'Authorization': 'Bearer ${ctx.accessToken}'},
      );
      if (!mounted || response.statusCode != 200) return;
      setState(() => _knowledge = jsonDecode(response.body) as Map<String, dynamic>);
    } catch (_) {
      // La carte reste masquée.
    }
  }

  /// Même raison que `_loadKnowledge` pour l'appel direct. Un échec laisse `_insights`
  /// nul, donc l'état vide — jamais un onglet à moitié rempli qui laisserait croire
  /// que les visiteurs n'ont rien demandé.
  Future<void> _loadInsights() async {
    final ctx = _managerContext;
    try {
      final response = await http.get(
        Uri.parse('${ctx.host}/api/Ai/insights/${ctx.instanceId}'),
        headers: {'Authorization': 'Bearer ${ctx.accessToken}'},
      );
      if (!mounted || response.statusCode != 200) return;
      setState(() => _insights =
          GuideIaInsights.fromJson(jsonDecode(response.body) as Map<String, dynamic>));
    } catch (_) {
      // L'onglet reste sur son état vide.
    }
  }

  /// Même appel direct que les deux ci-dessus. On ne lit qu'une chose : combien de jetons
  /// coûte une question **chez ce client**, mesuré par le serveur sur ses propres questions.
  ///
  /// ⚠️ Un échec laisse `_tokensPerQuestion` nul et la ligne « ~N questions » disparaît.
  /// C'est délibéré : le diviseur codé en dur qui vivait ici valait 1 000, alors que la grille
  /// vend 20 M de jetons pour ~2 000 questions — soit 10 000. Le gestionnaire lisait un crédit
  /// **dix fois trop généreux**. Pas de chiffre vaut mieux qu'un chiffre faux sur une jauge
  /// qui sert à décider d'un achat.
  Future<void> _loadTokensPerQuestion() async {
    final ctx = _managerContext;
    try {
      final response = await http.get(
        Uri.parse('${ctx.host}/api/Instance/${ctx.instanceId}/quota'),
        headers: {'Authorization': 'Bearer ${ctx.accessToken}'},
      );
      if (!mounted || response.statusCode != 200) return;
      final decoded = jsonDecode(response.body) as Map<String, dynamic>;
      final value = (decoded['aiTokensPerQuestion'] as num?)?.toInt() ?? 0;
      if (value > 0) setState(() => _tokensPerQuestion = value);
    } catch (_) {
      // La ligne « ~N questions » reste masquée.
    }
  }

  Future<void> _save() async {
    final instance = _instance;
    if (instance == null) return;
    final l = AppLocalizations.of(context)!;

    setState(() => _saving = true);

    // Les messages des autres langues sont préservés tels quels : on ne réécrit que la langue d'édition.
    final otherLanguages = (instance.guideFallbackMessages)
        .where((m) => m.language != _editingLanguage)
        .toList();
    final edited = _fallbackControllers
        .map((c) => c.text.trim())
        .where((t) => t.isNotEmpty)
        .map((t) => TranslationDTO(language: _editingLanguage, value: t))
        .toList();

    instance.guideName = _nameController.text.trim();
    instance.guidePersonaPrompt = _personaController.text.trim();
    instance.guideVoiceId = _voiceId;
    instance.guideFallbackMessages = [...otherLanguages, ...edited];

    try {
      await _managerContext.clientAPI!.instanceApi!.instanceUpdateinstance(instance);
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.guideIaSaved), backgroundColor: kPrimaryColor),
      );
    } catch (_) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.guideIaSaveError), backgroundColor: Colors.redAccent),
      );
    } finally {
      if (mounted) setState(() => _saving = false);
    }
  }

  /// Appel direct plutôt que via le client généré : l'endpoint est réservé au support,
  /// et `manager_api_new` s'édite à la main — on ne l'alourdit pas pour un bouton interne.
  /// Textes en français en dur, pour la même raison : aucun client ne voit cet écran.
  Future<void> _reindex() async {
    final ctx = _managerContext;
    final instanceId = ctx.instanceId;
    if (instanceId == null) return;

    final confirmed = await showDialog<bool>(
      context: context,
      builder: (dialogContext) => AlertDialog(
        title: const Text('Réindexer tout le contenu ?'),
        content: const Text(
          'Chaque section sera revectorisée, ce qui consomme du budget d\'embedding.\n\n'
          'Inutile si le guide répond mal : neuf fois sur dix le contenu est trop maigre, '
          'pas l\'index périmé. À réserver aux cas où l\'index est réellement incomplet.',
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(dialogContext, false), child: const Text('Annuler')),
          TextButton(onPressed: () => Navigator.pop(dialogContext, true), child: const Text('Réindexer')),
        ],
      ),
    );
    if (confirmed != true) return;

    setState(() => _reindexing = true);
    try {
      final response = await http.post(
        Uri.parse('${ctx.host}/api/Ai/reindex/$instanceId'),
        headers: {'Authorization': 'Bearer ${ctx.accessToken}'},
      );
      if (!mounted) return;

      if (response.statusCode == 202) {
        final sections = (jsonDecode(response.body)['sectionsQueued'] as num?)?.toInt() ?? 0;
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
          content: Text('Réindexation lancée — $sections section(s) en file. '
              'Le détail par section part dans les logs.'),
          backgroundColor: kPrimaryColor,
        ));
      } else {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
          content: Text('Échec (${response.statusCode}) : ${response.body}'),
          backgroundColor: Colors.redAccent,
        ));
      }
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Échec de la réindexation : $e'), backgroundColor: Colors.redAccent),
      );
    } finally {
      if (mounted) setState(() => _reindexing = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final l = AppLocalizations.of(context)!;
    if (_loading) return const Center(child: CircularProgressIndicator());

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _header(l),
        const SizedBox(height: kSpace5),
        _tabs(l),
        const SizedBox(height: kSpace7),
        Expanded(
          child: _tab == 0
              ? _configurationTab(l)
              : VisitorQuestionsTab(insights: _insights),
        ),
      ],
    );
  }

  /// Deux onglets, pas deux écrans : la configuration du guide et ce que les visiteurs
  /// lui demandent sont les deux faces d'un même objet. Les séparer obligerait le client
  /// à faire le lien lui-même entre une question sans réponse et le contenu à écrire.
  Widget _tabs(AppLocalizations l) {
    return Container(
      decoration: BoxDecoration(border: Border(bottom: BorderSide(color: kLine))),
      child: Row(
        children: [
          _tabButton(l.guideIaTabConfig, 0),
          _tabButton(l.guideIaTabQuestions, 1),
        ],
      ),
    );
  }

  Widget _tabButton(String label, int index) {
    final selected = _tab == index;
    return InkWell(
      onTap: () => setState(() => _tab = index),
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 9),
        decoration: BoxDecoration(
          border: Border(
            bottom: BorderSide(
              color: selected ? kBrand : Colors.transparent,
              width: 2,
            ),
          ),
        ),
        child: Text(
          label,
          style: TextStyle(
            fontSize: 14,
            color: selected ? kInk : kInk3,
            fontWeight: selected ? FontWeight.w600 : FontWeight.w400,
          ),
        ),
      ),
    );
  }

  Widget _configurationTab(AppLocalizations l) {
    final wide = MediaQuery.of(context).size.width > 1100;

    final left = Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _usageCard(l),
        const SizedBox(height: 16),
        _channelsCard(l),
        const SizedBox(height: 16),
        _identityCard(l),
      ],
    );
    final right = Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _previewCard(l),
        const SizedBox(height: 16),
        _voiceCard(l),
        if (_knowledge != null) ...[
          const SizedBox(height: 16),
          _knowledgeCard(l),
        ],
        if (_managerContext.role == UserRole.SuperAdmin) ...[
          const SizedBox(height: 16),
          _reindexCard(),
        ],
      ],
    );

    return SingleChildScrollView(
      child: wide
          ? Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Expanded(child: left),
                const SizedBox(width: 16),
                Expanded(child: right),
              ],
            )
          : Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [left, const SizedBox(height: 16), right],
            ),
    );
  }

  Widget _header(AppLocalizations l) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(l.menuGuideIa,
                  style: TextStyle(fontSize: 26, fontWeight: FontWeight.w600, color: kPrimaryColor)),
              const SizedBox(height: 4),
              Text(l.guideIaSubtitle,
                  style: TextStyle(fontSize: 14, color: kBodyTextColor)),
            ],
          ),
        ),
        const SizedBox(width: 16),
        FilledButton(
          style: FilledButton.styleFrom(backgroundColor: kPrimaryColor),
          onPressed: _saving ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 18, height: 18, child: CircularProgressIndicator(strokeWidth: 2, color: kWhite))
              : Text(l.guideIaSave),
        ),
      ],
    );
  }

  Widget _card({required String title, String? subtitle, required Widget child}) {
    return Card(
      elevation: 0,
      color: kWhite,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(title, style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: kPrimaryColor)),
            if (subtitle != null) ...[
              const SizedBox(height: 3),
              Text(subtitle, style: TextStyle(fontSize: 13, color: kBodyTextColor.withValues(alpha: 0.75))),
            ],
            const SizedBox(height: 16),
            child,
          ],
        ),
      ),
    );
  }

  /// Visible pour le SuperAdmin seulement — c'est un outil de réparation, pas une
  /// fonctionnalité. Exposé au client, il serait cliqué à chaque réponse décevante du guide,
  /// pour un coût d'embedding complet à chaque fois et sans rien améliorer.
  Widget _reindexCard() {
    return _card(
      title: 'Réindexer le contenu (support)',
      subtitle: 'Visible par le support Unov uniquement.',
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'Le rattrapage est automatique au passage à un plan avec IA. Ce bouton ne sert '
            'que si l\'index est resté incomplet — un job d\'indexation en échec, par exemple.',
            style: TextStyle(fontSize: 12, color: kBodyTextColor.withValues(alpha: 0.7)),
          ),
          const SizedBox(height: 12),
          OutlinedButton.icon(
            onPressed: _reindexing ? null : _reindex,
            icon: _reindexing
                ? const SizedBox(width: 16, height: 16, child: CircularProgressIndicator(strokeWidth: 2))
                : const Icon(Icons.refresh),
            label: Text(_reindexing ? 'Lancement…' : 'Réindexer tout le contenu'),
          ),
        ],
      ),
    );
  }

  Widget _usageCard(AppLocalizations l) {
    final used = _instance?.aiTokensThisMonth ?? 0;
    final quota = _instance?.aiTokensPerMonth ?? 0;
    // Le gestionnaire raisonne en questions, pas en jetons de traitement. Le diviseur vient
    // du serveur (`aiTokensPerQuestion`), qui le mesure sur les questions réellement posées
    // par cette instance — il n'est pas codé ici.
    final tokensPerQuestion = _tokensPerQuestion;
    final questions = tokensPerQuestion != null ? (used / tokensPerQuestion).round() : null;
    final ratio = quota > 0 ? (used / quota).clamp(0.0, 1.0) : 0.0;

    return _card(
      title: l.guideIaUsageTitle,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (quota > 0) ...[
            Text('${(ratio * 100).round()} %',
                style: TextStyle(fontSize: 28, fontWeight: FontWeight.w700, color: kPrimaryColor)),
            const SizedBox(height: 10),
            ClipRRect(
              borderRadius: BorderRadius.circular(4),
              child: LinearProgressIndicator(
                value: ratio.toDouble(),
                minHeight: 8,
                backgroundColor: kSecond.withValues(alpha: 0.4),
                color: kPrimaryColor,
              ),
            ),
            const SizedBox(height: 10),
            if (questions != null)
              Text(l.guideIaUsageQuestions(questions), style: TextStyle(fontSize: 13, color: kBodyTextColor)),
          ] else
            Text(l.guideIaUsageNoQuota, style: TextStyle(fontSize: 13, color: kBodyTextColor)),
        ],
      ),
    );
  }

  Widget _channelsCard(AppLocalizations l) {
    final apps = _instance?.applicationInstanceDTOs ?? [];

    return _card(
      title: l.guideIaChannelsTitle,
      subtitle: l.guideIaChannelsSub,
      child: Column(
        children: apps.map((app) {
          final on = app.isAssistant == true;
          return Padding(
            padding: const EdgeInsets.symmetric(vertical: 7),
            child: Row(
              children: [
                Icon(on ? Icons.check_circle : Icons.remove_circle_outline,
                    size: 18, color: on ? kPrimaryColor : kSecond),
                const SizedBox(width: 10),
                Expanded(
                    child: Text((app.appType?.value ?? '—').toString(),
                        style: const TextStyle(fontSize: 14))),
                Text(on ? l.guideIaChannelOn : l.guideIaChannelOff,
                    style: TextStyle(fontSize: 12.5, color: kBodyTextColor.withValues(alpha: 0.7))),
              ],
            ),
          );
        }).toList(),
      ),
    );
  }

  Widget _identityCard(AppLocalizations l) {
    return _card(
      title: l.guideIaIdentityTitle,
      subtitle: l.guideIaIdentitySub,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          TextField(
            controller: _nameController,
            decoration: InputDecoration(
              labelText: l.guideIaNameLabel,
              helperText: l.guideIaNameHint,
              border: const OutlineInputBorder(),
            ),
          ),
          const SizedBox(height: 20),
          TextField(
            controller: _personaController,
            maxLines: 5,
            decoration: InputDecoration(
              labelText: l.guideIaPersonaLabel,
              alignLabelWithHint: true,
              border: const OutlineInputBorder(),
            ),
          ),
          const SizedBox(height: 8),
          Text(l.guideIaPersonaHint, style: TextStyle(fontSize: 12, color: kBodyTextColor.withValues(alpha: 0.7))),
          const SizedBox(height: 8),
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: [
              _exampleChip(l.guideIaExampleWarden, l.guideIaExampleWardenText),
              _exampleChip(l.guideIaExampleSober, l.guideIaExampleSoberText),
              _exampleChip(l.guideIaExampleKids, l.guideIaExampleKidsText),
            ],
          ),
          const SizedBox(height: 24),
          Text(l.guideIaFallbackLabel,
              style: TextStyle(fontSize: 13, fontWeight: FontWeight.w600, color: kBodyTextColor)),
          const SizedBox(height: 8),
          ...List.generate(_fallbackControllers.length, (i) => _fallbackRow(i)),
          const SizedBox(height: 4),
          TextButton.icon(
            onPressed: () => setState(() => _fallbackControllers.add(TextEditingController())),
            icon: const Icon(Icons.add, size: 18),
            label: Text(l.guideIaFallbackAdd),
            style: TextButton.styleFrom(foregroundColor: kPrimaryColor),
          ),
          const SizedBox(height: 4),
          Text(l.guideIaFallbackHint, style: TextStyle(fontSize: 12, color: kBodyTextColor.withValues(alpha: 0.7))),
          const SizedBox(height: 10),
          _info(l.guideIaFallbackTranslated),
        ],
      ),
    );
  }

  Widget _fallbackRow(int index) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 8),
      child: Row(
        children: [
          Expanded(
            child: TextField(
              controller: _fallbackControllers[index],
              decoration: const InputDecoration(
                isDense: true,
                border: OutlineInputBorder(),
              ),
            ),
          ),
          IconButton(
            onPressed: _fallbackControllers.length <= 1
                ? null
                : () => setState(() => _fallbackControllers.removeAt(index).dispose()),
            icon: const Icon(Icons.close, size: 18),
            color: kBodyTextColor,
          ),
        ],
      ),
    );
  }

  Widget _exampleChip(String label, String text) {
    return ActionChip(
      label: Text(label, style: const TextStyle(fontSize: 12.5)),
      onPressed: () => setState(() => _personaController.text = text),
      side: BorderSide(color: kSecond),
      backgroundColor: kWhite,
    );
  }

  /// Interroge le guide réellement publié, pas une simulation : c'est le seul moyen de
  /// vérifier que la personnalité saisie produit le ton attendu. D'où l'avertissement
  /// quand des modifications ne sont pas encore enregistrées — sinon le client teste
  /// l'ancienne configuration en croyant tester la nouvelle.
  Future<void> _sendPreview() async {
    final message = _previewController.text.trim();
    if (message.isEmpty || _previewPending) return;

    final ctx = _managerContext;
    setState(() {
      _previewTurns.add(_PreviewTurn(message, null));
      _previewController.clear();
      _previewPending = true;
    });

    try {
      final response = await ctx.clientAPI!.aiApi!.aiChat(AiChatRequest(
        message: message,
        instanceId: ctx.instanceId,
        appType: AppType.Web,
        language: _editingLanguage,
        // ⚠️ C'est le gestionnaire qui teste sa personnalité, pas un visiteur qui pose une
        // question : sans ce drapeau, chaque essai atterrissait dans son propre onglet
        // « Ce que demandent vos visiteurs » et gonflait le bloc des questions sans réponse.
        isVisitorQuestion: false,
      ));
      if (!mounted) return;
      setState(() {
        _previewTurns.last = _PreviewTurn(message, response?.reply ?? '');
        _previewPending = false;
      });
    } catch (_) {
      if (!mounted) return;
      setState(() {
        _previewTurns.last = _PreviewTurn(message, null);
        _previewPending = false;
      });
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(AppLocalizations.of(context)!.guideIaPreviewError),
          backgroundColor: Colors.redAccent,
        ),
      );
    }
  }

  Widget _previewCard(AppLocalizations l) {
    return _card(
      title: l.guideIaPreviewTitle,
      subtitle: l.guideIaPreviewSub,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            padding: const EdgeInsets.all(14),
            decoration: BoxDecoration(
              color: kSurface2,
              border: Border.all(color: kLine),
              borderRadius: BorderRadius.circular(7),
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                if (_previewTurns.isEmpty)
                  Text(l.guideIaPreviewUnsaved, style: kTextHint)
                else
                  for (final turn in _previewTurns) ..._previewBubbles(turn),
                if (_previewPending) ...[
                  const SizedBox(height: kSpace3),
                  const SizedBox(
                    width: 18,
                    height: 18,
                    child: CircularProgressIndicator(strokeWidth: 2),
                  ),
                ],
              ],
            ),
          ),
          const SizedBox(height: kSpace4),
          Row(
            children: [
              Expanded(
                child: TextField(
                  controller: _previewController,
                  onSubmitted: (_) => _sendPreview(),
                  decoration: InputDecoration(
                    isDense: true,
                    hintText: l.guideIaPreviewPlaceholder,
                    border: const OutlineInputBorder(),
                  ),
                ),
              ),
              const SizedBox(width: kSpace3),
              IconButton(
                onPressed: _previewPending ? null : _sendPreview,
                icon: const Icon(Icons.send),
                color: kBrand,
              ),
            ],
          ),
          const SizedBox(height: kSpace4),
          _info(l.guideIaPreviewSourcesInfo),
        ],
      ),
    );
  }

  List<Widget> _previewBubbles(_PreviewTurn turn) {
    return [
      Align(
        alignment: Alignment.centerRight,
        child: Container(
          margin: const EdgeInsets.only(bottom: 9),
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
          constraints: const BoxConstraints(maxWidth: 340),
          decoration: BoxDecoration(
            color: kBrand,
            borderRadius: const BorderRadius.only(
              topLeft: Radius.circular(12),
              topRight: Radius.circular(12),
              bottomLeft: Radius.circular(12),
              bottomRight: Radius.circular(4),
            ),
          ),
          child: Text(turn.question, style: kTextBody.copyWith(color: kOnBrand)),
        ),
      ),
      if (turn.answer != null)
        Align(
          alignment: Alignment.centerLeft,
          child: Container(
            margin: const EdgeInsets.only(bottom: 9),
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
            constraints: const BoxConstraints(maxWidth: 340),
            decoration: BoxDecoration(
              color: kSurface,
              border: Border.all(color: kLine),
              borderRadius: const BorderRadius.only(
                topLeft: Radius.circular(12),
                topRight: Radius.circular(12),
                bottomLeft: Radius.circular(4),
                bottomRight: Radius.circular(12),
              ),
            ),
            child: Text(turn.answer!, style: kTextBody),
          ),
        ),
    ];
  }

  /// Mesuré sur l'index vectoriel, pas sur les tables de contenu : une section
  /// désactivée est purgée de l'index, une section sans texte exploitable n'y entre pas.
  /// Compter les sections publiées donnerait un chiffre plus flatteur et faux.
  Widget _knowledgeCard(AppLocalizations l) {
    final k = _knowledge!;
    final languages = (k['languages'] as List?)?.cast<String>() ?? const <String>[];
    final lastIndexed = DateTime.tryParse((k['lastIndexedAt'] ?? '').toString());

    return _card(
      title: l.guideIaKnowledgeTitle,
      subtitle: l.guideIaKnowledgeSub,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          _knowledgeRow(l.guideIaKnowledgeSections, '${k['indexedSections'] ?? 0}', first: true),
          _knowledgeRow(l.guideIaKnowledgeChunks, '${k['chunks'] ?? 0}'),
          _knowledgeRow(
            l.guideIaKnowledgeLanguages,
            languages.isEmpty ? '—' : languages.join(' · '),
          ),
          _knowledgeRow(
            l.guideIaKnowledgeLastIndexed,
            lastIndexed == null ? '—' : _relativeTime(l, lastIndexed),
          ),
          const SizedBox(height: kSpace3),
          Text(l.guideIaKnowledgeHint, style: kTextHint),
        ],
      ),
    );
  }

  Widget _knowledgeRow(String label, String value, {bool first = false}) {
    return Container(
      padding: const EdgeInsets.symmetric(vertical: 7),
      decoration: BoxDecoration(
        border: first ? null : Border(top: BorderSide(color: kLineSoft)),
      ),
      child: Row(
        children: [
          Expanded(child: Text(label, style: kTextBody)),
          const SizedBox(width: kSpace4),
          Text(value,
              style: kTextBody.copyWith(
                  fontFamily: kMonoFamily, fontWeight: FontWeight.w600)),
        ],
      ),
    );
  }

  String _relativeTime(AppLocalizations l, DateTime utc) {
    final minutes = DateTime.now().toUtc().difference(utc).inMinutes;
    if (minutes < 60) return l.guideIaKnowledgeMinutesAgo(minutes < 1 ? 1 : minutes);
    if (minutes < 60 * 24) return l.guideIaKnowledgeHoursAgo(minutes ~/ 60);
    return l.guideIaKnowledgeDaysAgo(minutes ~/ (60 * 24));
  }

  Widget _voiceCard(AppLocalizations l) {
    final wakeword = _voiceId == kGuideVoiceMarco ? 'Marco' : 'Viva';

    return _card(
      title: l.guideIaVoiceTitle,
      subtitle: l.guideIaVoiceSub,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Expanded(child: _voiceOption('Viva', l.guideIaVoiceFemale, kGuideVoiceViva, l)),
              const SizedBox(width: 10),
              Expanded(child: _voiceOption('Marco', l.guideIaVoiceMale, kGuideVoiceMarco, l)),
            ],
          ),
          const SizedBox(height: 14),
          _info(l.guideIaVoiceInfoName(wakeword)),
          const SizedBox(height: 8),
          _info(l.guideIaVoiceInfoGlasses),
          const SizedBox(height: 8),
          _info(l.guideIaVoiceInfoMultilang),
        ],
      ),
    );
  }

  Widget _voiceOption(String name, String description, String voiceId, AppLocalizations l) {
    final selected = _voiceId == voiceId;
    return InkWell(
      onTap: () => setState(() => _voiceId = voiceId),
      borderRadius: BorderRadius.circular(8),
      child: Container(
        padding: const EdgeInsets.all(13),
        decoration: BoxDecoration(
          border: Border.all(color: selected ? kPrimaryColor : kSecond, width: selected ? 2 : 1),
          borderRadius: BorderRadius.circular(8),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(name, style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: kPrimaryColor)),
            const SizedBox(height: 2),
            Text(description, style: TextStyle(fontSize: 12.5, color: kBodyTextColor)),
            const SizedBox(height: 8),
            Text(l.guideIaVoiceWakeword(name),
                style: TextStyle(fontSize: 11.5, color: kBodyTextColor.withValues(alpha: 0.7))),
          ],
        ),
      ),
    );
  }

  Widget _info(String text) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
      decoration: BoxDecoration(
        color: kBackgroundColor,
        borderRadius: BorderRadius.circular(6),
      ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Icon(Icons.info_outline, size: 16, color: kPrimaryColor),
          const SizedBox(width: 9),
          Expanded(child: Text(text, style: TextStyle(fontSize: 12.5, color: kBodyTextColor))),
        ],
      ),
    );
  }
}

class _PreviewTurn {
  final String question;
  final String? answer;

  const _PreviewTurn(this.question, this.answer);
}