import 'package:manager_app/l10n/app_localizations.dart';

import 'package:flutter/material.dart';
import 'package:flutter_quill/flutter_quill.dart';
import 'package:flutter_quill_delta_from_html/flutter_quill_delta_from_html.dart';
import 'package:manager_api_new/api.dart';
import 'package:manager_app/Components/resource_input_container.dart';
import 'package:manager_app/Helpers/quill_html_converter.dart';
import 'package:manager_app/Models/managerContext.dart' show ManagerAppContext;
import 'package:manager_app/Services/ai_translate_service.dart';
import 'package:manager_app/constants.dart';
import 'package:provider/provider.dart';

import 'ai_quota_hint.dart';
import 'flag_decoration.dart';
import 'message_notification.dart';
import 'package:manager_app/app_context.dart';

class TranslationInputContainer extends StatefulWidget {
  TranslationInputContainer({
    Key? key,
    required this.isTitle,
    required this.values,
    required this.newValues,
    required this.onGetResult,
    required this.maxLines,
    required this.resourceTypes,
    this.isHTML = true,
  }) : super(key: key);

  bool isTitle;
  List<TranslationDTO> values;
  List<TranslationDTO> newValues;
  Function onGetResult;
  int maxLines;
  List<ResourceType>? resourceTypes;

  /// Quill quand le champ accepte du HTML, champ simple sinon. C'est la seule
  /// différence entre ce modal et l'ancien `multi_input_modal.dart`, qui en
  /// était le jumeau.
  final bool isHTML;

  @override
  State<TranslationInputContainer> createState() => _TranslationInputContainerState();
}

class _TranslationInputContainerState extends State<TranslationInputContainer> {
  late Map<String, QuillController> _controllers;
  late Map<String, TextEditingController> _textControllers;
  int _selected = 0;
  bool _isEnforcingLimit = false;
  bool _isTranslating = false;
  int _quotaRefreshToken = 0;

  @override
  void initState() {
    super.initState();
    _controllers = widget.isHTML ? _buildControllers() : {};
    _textControllers = widget.isHTML ? {} : _buildTextControllers();
  }

  Map<String, TextEditingController> _buildTextControllers() {
    final map = <String, TextEditingController>{};
    for (final translation in widget.newValues) {
      final controller = TextEditingController(text: translation.value ?? '');
      controller.addListener(() {
        translation.value = controller.text;
      });
      map[translation.language!] = controller;
    }
    return map;
  }

  static const _emptyDelta = [{'insert': '\n'}];

  List<dynamic> _htmlToDeltaJson(String html) {
    if (html.trim().isEmpty) return _emptyDelta;
    final ops = HtmlToDelta().convert(html).toJson();
    return ops.isEmpty ? _emptyDelta : ops;
  }

  Map<String, QuillController> _buildControllers() {
    final map = <String, QuillController>{};
    for (final translation in widget.newValues) {
      final html = translation.value ?? '';
      final controller = QuillController(
        document: Document.fromJson(_htmlToDeltaJson(html)),
        selection: const TextSelection.collapsed(offset: 0),
      );
      _setupListener(translation.language!, controller);
      map[translation.language!] = controller;
    }
    return map;
  }

  void _setupListener(String lang, QuillController controller) {
    controller.document.changes.listen((_) {
      if (!mounted || _isEnforcingLimit) return;
      final limit = widget.isTitle ? kTitleMaxLength : kDescriptionMaxLength;
      final plain = controller.document.toPlainText().trimRight();
      if (plain.length > limit) {
        WidgetsBinding.instance.addPostFrameCallback((_) {
          if (mounted && !_isEnforcingLimit) {
            _isEnforcingLimit = true;
            controller.undo();
            _isEnforcingLimit = false;
          }
        });
        return;
      }
      widget.newValues
          .firstWhere((e) => e.language == lang)
          .value = _controllerToHtml(controller);
      // Le compteur de caractères et les pastilles du rail lisent cette valeur.
      setState(() {});
    });
  }

  String _controllerToHtml(QuillController controller) {
    return quillOpsToHtml(controller.document.toDelta().toJson());
  }

  Future<void> _translateWithAI() async {
    final appContext = context.read<AppContext>().getContext() as ManagerAppContext;
    if (appContext.instanceDTO?.isAssistant != true) return;

    final source = widget.newValues.firstWhere(
      (t) => t.value != null && t.value!.trim().isNotEmpty && t.value!.trim() != '<p><br></p>',
      orElse: () => widget.newValues.first,
    );

    if (source.value == null || source.value!.trim().isEmpty) {
      showNotification(kError, kWhite, AppLocalizations.of(context)!.noSourceTextToTranslate, context, null);
      return;
    }

    final targetLangs = widget.newValues
        .where((t) => t.language != source.language)
        .map((t) => t.language!)
        .toList();

    if (targetLangs.isEmpty) return;

    setState(() => _isTranslating = true);

    try {
      final translations = await AiTranslateService.translate(
        host: appContext.host!,
        accessToken: appContext.accessToken!,
        instanceId: appContext.instanceId!,
        text: source.value!,
        sourceLang: source.language!,
        targetLangs: targetLangs,
      );

      setState(() {
        for (final translation in widget.newValues) {
          final lang = translation.language!;
          if (lang == source.language) continue;
          final translated = translations[lang];
          if (translated == null) continue;
          _replaceValue(translation, translated);
        }
      });

      showNotification(kSuccess, kWhite, AppLocalizations.of(context)!.translationApplied, context, null);
    } catch (e) {
      // Le backend renvoie un message explicite (quota dépassé, assistant désactivé…) :
      // on l'affiche tel quel plutôt qu'une erreur générique.
      final message = e is AiTranslateException
          ? e.localized(AppLocalizations.of(context)!)
          : AppLocalizations.of(context)!.aiTranslateError;
      final color = (e is AiTranslateException && e.isQuotaExceeded) ? Colors.orange : kError;
      showNotification(color, kWhite, message, context, null);
    } finally {
      setState(() {
        _isTranslating = false;
        _quotaRefreshToken++;
      });
    }
  }

  /// La langue affichée sert de source : c'est celle qu'on vient d'écrire.
  void _applyToAllLanguages() {
    final source = widget.newValues[_selected];
    final sourceLang = source.language!;
    final sourceValue = widget.isHTML
        ? _controllerToHtml(_controllers[sourceLang]!)
        : (_textControllers[sourceLang]?.text ?? '');

    setState(() {
      source.value = sourceValue;
      for (final translation in widget.newValues) {
        if (translation.language == sourceLang) continue;
        _replaceValue(translation, sourceValue);
      }
    });

    showNotification(kSuccess, kWhite, AppLocalizations.of(context)!.textAppliedToAllLanguages, context, null);
  }

  @override
  void dispose() {
    for (final c in _controllers.values) {
      c.dispose();
    }
    for (final c in _textControllers.values) {
      c.dispose();
    }
    super.dispose();
  }

  /// Remplace la valeur d'une langue *et* le contenu de son éditeur. C'est le
  /// seul chemin qui recrée un `QuillController` — la traduction IA et
  /// « appliquer à toutes les langues » passent par ici.
  void _replaceValue(TranslationDTO translation, String value) {
    final lang = translation.language!;
    translation.value = value;

    if (!widget.isHTML) {
      _textControllers[lang]?.text = value;
      return;
    }

    _controllers[lang]?.dispose();
    final controller = QuillController(
      document: Document.fromJson(_htmlToDeltaJson(value)),
      selection: const TextSelection.collapsed(offset: 0),
    );
    _setupListener(lang, controller);
    _controllers[lang] = controller;
  }

  /// ⚠️ Les éditeurs sont tous montés en permanence dans un `IndexedStack` :
  /// la map de `QuillController` est bâtie une fois dans `initState` et libérée
  /// dans `dispose`. Ne jamais reconstruire l'éditeur à la bascule de langue,
  /// et surtout pas de `TabBarView` (construction paresseuse, enfants lâchés
  /// hors écran).
  @override
  Widget build(BuildContext context) {
    final l = AppLocalizations.of(context)!;

    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Flexible(
          child: SingleChildScrollView(
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                SizedBox(width: 132, child: _buildRail()),
                const SizedBox(width: kSpace5),
                Expanded(child: _buildPane(l)),
              ],
            ),
          ),
        ),
        if (widget.resourceTypes == null) _buildActionBar(l),
      ],
    );
  }

  /// Le rail donne l'état des langues d'un coup d'œil, au lieu de le faire
  /// deviner en faisant défiler un empilement d'éditeurs.
  Widget _buildRail() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        for (var index = 0; index < widget.newValues.length; index++)
          _buildRailRow(index),
      ],
    );
  }

  Widget _buildRailRow(int index) {
    final translation = widget.newValues[index];
    final lang = translation.language!;
    final isSelected = index == _selected;
    final isFilled = _isFilled(translation);

    return Padding(
      padding: const EdgeInsets.only(bottom: kSpace2),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          borderRadius: BorderRadius.circular(kRadiusInput),
          onTap: () => setState(() => _selected = index),
          child: Container(
            padding: const EdgeInsets.symmetric(
                horizontal: kSpace3, vertical: kSpace3),
            decoration: BoxDecoration(
              color: isSelected ? kSurface : Colors.transparent,
              border: Border.all(
                  color: isSelected ? kPrimaryColor : Colors.transparent),
              borderRadius: BorderRadius.circular(kRadiusInput),
            ),
            child: Row(
              children: [
                FlagDecoration(language: lang),
                const SizedBox(width: kSpace3),
                Expanded(
                  child: Text(lang.toUpperCase(),
                      style: TextStyle(
                          fontSize: 12.5,
                          fontWeight:
                              isSelected ? FontWeight.w600 : FontWeight.w400,
                          color: kInk)),
                ),
                Container(
                  width: 8,
                  height: 8,
                  decoration: BoxDecoration(
                    shape: BoxShape.circle,
                    color: isFilled ? kSuccess : Colors.transparent,
                    border: isFilled ? null : Border.all(color: kLine),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  bool _isFilled(TranslationDTO translation) {
    final value = (translation.value ?? '').trim();
    return value.isNotEmpty && value != '<p><br></p>';
  }

  Widget _buildPane(AppLocalizations l) {
    if (widget.resourceTypes != null) {
      return IndexedStack(
        index: _selected,
        children: [
          for (final translation in widget.newValues)
            SizedBox(
              width: 250,
              child: ResourceInputContainer(
                label: "",
                initialValue: translation.value,
                inResourceTypes: widget.resourceTypes!,
                onChanged: (ResourceDTO resource) {
                  translation.value = resource.id;
                },
              ),
            ),
        ],
      );
    }

    final reference = _reference();
    final selectedLang = widget.newValues[_selected].language!;
    final limit = widget.isTitle ? kTitleMaxLength : kDescriptionMaxLength;
    final length = widget.isHTML
        ? _controllers[selectedLang]!.document.toPlainText().trimRight().length
        : (_textControllers[selectedLang]?.text.length ?? 0);

    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        // On traduit *depuis* une référence : la langue source reste visible.
        if (reference != null) ...[
          Container(
            padding: const EdgeInsets.symmetric(
                horizontal: kSpace4, vertical: kSpace3),
            decoration: BoxDecoration(
              color: kSurface2,
              border: Border.all(color: kLineSoft),
              borderRadius: BorderRadius.circular(kRadiusInput),
            ),
            child: Row(
              children: [
                Text(reference.language!.toUpperCase(),
                    style: const TextStyle(
                        fontSize: 10.5,
                        fontWeight: FontWeight.w600,
                        letterSpacing: 0.5,
                        color: kInk3)),
                const SizedBox(width: kSpace3),
                Expanded(
                  child: Text(_plainText(reference.value ?? ''),
                      maxLines: 2,
                      overflow: TextOverflow.ellipsis,
                      style: kTextSmall),
                ),
              ],
            ),
          ),
          const SizedBox(height: kSpace4),
        ],
        IndexedStack(
          index: _selected,
          children: [
            for (final translation in widget.newValues)
              _buildEditor(translation.language!),
          ],
        ),
        const SizedBox(height: kSpace2),
        Text("$length / $limit", style: kTextHint),
      ],
    );
  }

  /// La référence est la première langue renseignée qui n'est pas celle qu'on
  /// est en train d'écrire.
  TranslationDTO? _reference() {
    final selected = widget.newValues[_selected];
    for (final translation in widget.newValues) {
      if (translation.language == selected.language) continue;
      if (_isFilled(translation)) return translation;
    }
    return null;
  }

  String _plainText(String html) {
    return html
        .replaceAll(RegExp(r'<[^>]*>'), ' ')
        .replaceAll(RegExp(r'\s+'), ' ')
        .trim();
  }

  Widget _buildEditor(String lang) {
    if (!widget.isHTML) {
      return TextFormField(
        controller: _textControllers[lang],
        maxLines: widget.maxLines,
        maxLength: widget.isTitle ? kTitleMaxLength : kDescriptionMaxLength,
        style: const TextStyle(fontSize: 13, color: kInk),
        onChanged: (_) => setState(() {}),
        decoration: InputDecoration(
          isDense: true,
          counterText: '',
          contentPadding: const EdgeInsets.all(kSpace4),
          filled: true,
          fillColor: kSurface,
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(kRadiusInput),
            borderSide: const BorderSide(color: kLine),
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(kRadiusInput),
            borderSide: const BorderSide(color: kLine),
          ),
        ),
      );
    }

    final controller = _controllers[lang]!;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        QuillSimpleToolbar(
          controller: controller,
          config: _buildToolbarConfig(),
        ),
        Container(
          height: widget.isTitle ? 100 : 240,
          decoration: BoxDecoration(
            color: kSurface,
            border: Border.all(color: kLine),
            borderRadius: const BorderRadius.only(
              bottomLeft: Radius.circular(kRadiusInput),
              bottomRight: Radius.circular(kRadiusInput),
            ),
          ),
          child: QuillEditor.basic(
            controller: controller,
            config: const QuillEditorConfig(
              scrollable: true,
              expands: false,
              padding: EdgeInsets.all(8),
              autoFocus: false,
            ),
          ),
        ),
      ],
    );
  }

  /// Les deux gros boutons ont quitté le flux du contenu : ce sont des actions,
  /// et le quota IA se lit à côté du bouton qu'il conditionne.
  Widget _buildActionBar(AppLocalizations l) {
    final instance = context.watch<AppContext>().getContext()?.instanceDTO;

    return Padding(
      padding: const EdgeInsets.only(top: kSpace4),
      child: Row(
        children: [
          TextButton.icon(
            onPressed: _applyToAllLanguages,
            icon: const Icon(Icons.content_copy, size: 15, color: kInk2),
            label: Text(l.applyToAllLanguages,
                style: const TextStyle(
                    fontSize: 13, fontWeight: FontWeight.w600, color: kInk2)),
          ),
          if (instance?.isAssistant == true) ...[
            const SizedBox(width: kSpace2),
            if (_isTranslating)
              const SizedBox(
                  width: 18,
                  height: 18,
                  child: CircularProgressIndicator(strokeWidth: 2))
            else
              TextButton.icon(
                onPressed: _translateWithAI,
                icon: const Icon(Icons.auto_awesome,
                    size: 15, color: kPrimaryColor),
                label: Text(l.translateWithAi,
                    style: const TextStyle(
                        fontSize: 13,
                        fontWeight: FontWeight.w600,
                        color: kPrimaryColor)),
              ),
            const SizedBox(width: kSpace3),
            Flexible(child: AiQuotaHint(key: ValueKey(_quotaRefreshToken))),
          ],
        ],
      ),
    );
  }

  QuillSimpleToolbarConfig _buildToolbarConfig() {
    return QuillSimpleToolbarConfig(
      showBoldButton: true,
      showItalicButton: true,
      showColorButton: true,
      showBackgroundColorButton: true,
      showListBullets: !widget.isTitle,
      showListNumbers: !widget.isTitle,
      showListCheck: false,
      showClearFormat: true,
      showUnderLineButton: false,
      showStrikeThrough: false,
      showInlineCode: false,
      showSubscript: false,
      showSuperscript: false,
      showSmallButton: false,
      showLineHeightButton: false,
      showHeaderStyle: false,
      showLink: false,
      showSearchButton: false,
      showQuote: false,
      showCodeBlock: false,
      showIndent: false,
      showAlignmentButtons: false,
      showLeftAlignment: false,
      showCenterAlignment: false,
      showRightAlignment: false,
      showJustifyAlignment: false,
      showDirection: false,
      showUndo: false,
      showRedo: false,
      showClipboardCut: false,
      showClipboardCopy: false,
      showClipboardPaste: false,
    );
  }
}