flutter/lib/state/experience_controller.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:latlong2/latlong.dart';

import '../models/experience_models.dart';

final experienceControllerProvider =
    NotifierProvider<ExperienceController, ExperienceState>(
      ExperienceController.new,
    );

class ExperienceState {
  const ExperienceState({
    required this.experiences,
    required this.selectedExperienceId,
    required this.filterEmotion,
    required this.profile,
  });

  final List<PlaceExperience> experiences;
  final String? selectedExperienceId;
  final ExperienceEmotion? filterEmotion;
  final ExperienceAuthor profile;

  List<PlaceExperience> get visibleExperiences {
    final emotion = filterEmotion;
    if (emotion == null) {
      return experiences;
    }
    return experiences.where((item) => item.emotion == emotion).toList();
  }

  PlaceExperience? get selectedExperience {
    for (final experience in experiences) {
      if (experience.id == selectedExperienceId) {
        return experience;
      }
    }
    return visibleExperiences.isEmpty ? null : visibleExperiences.first;
  }

  ExperienceState copyWith({
    List<PlaceExperience>? experiences,
    String? selectedExperienceId,
    bool clearSelection = false,
    ExperienceEmotion? filterEmotion,
    bool clearFilter = false,
    ExperienceAuthor? profile,
  }) {
    return ExperienceState(
      experiences: experiences ?? this.experiences,
      selectedExperienceId: clearSelection
          ? null
          : selectedExperienceId ?? this.selectedExperienceId,
      filterEmotion: clearFilter ? null : filterEmotion ?? this.filterEmotion,
      profile: profile ?? this.profile,
    );
  }
}

class ExperienceController extends Notifier<ExperienceState> {
  @override
  ExperienceState build() {
    final experiences = _seedExperiences();
    return ExperienceState(
      experiences: experiences,
      selectedExperienceId: experiences.first.id,
      filterEmotion: null,
      profile: const ExperienceAuthor(
        name: 'Руслан',
        facets: [
          ProfileFacet(name: 'темп', value: 'спокойно, без очередей'),
          ProfileFacet(name: 'еда', value: 'яркое блюдо важнее кухни'),
          ProfileFacet(
            name: 'контекст',
            value: 'работа днем, прогулки вечером',
          ),
        ],
      ),
    );
  }

  void selectExperience(String id) {
    state = state.copyWith(selectedExperienceId: id);
  }

  void setEmotionFilter(ExperienceEmotion? emotion) {
    if (emotion == null) {
      state = state.copyWith(clearFilter: true);
      return;
    }
    final nextVisible = state.experiences.firstWhere(
      (item) => item.emotion == emotion,
      orElse: () => state.experiences.first,
    );
    state = state.copyWith(
      filterEmotion: emotion,
      selectedExperienceId: nextVisible.id,
    );
  }

  void addExperience({
    required String placeName,
    required String dishName,
    required ExperienceEmotion emotion,
    required LatLng coordinate,
    required String context,
  }) {
    final experience = PlaceExperience(
      id: 'local-${DateTime.now().microsecondsSinceEpoch}',
      placeName: placeName.trim().isEmpty ? 'Новое место' : placeName.trim(),
      neighborhood: 'рядом',
      coordinate: coordinate,
      emotion: emotion,
      intensity: 3,
      context: context.trim().isEmpty ? 'личная заметка' : context.trim(),
      dish: DishSignal(
        name: dishName.trim().isEmpty ? 'блюдо' : dishName.trim(),
        reason: 'стоит проверить лично',
        texture: 'новый сигнал',
      ),
      author: state.profile,
      createdLabel: 'сейчас',
    );

    state = state.copyWith(
      experiences: [experience, ...state.experiences],
      selectedExperienceId: experience.id,
      clearFilter: true,
    );
  }

  List<PlaceExperience> _seedExperiences() {
    const author = ExperienceAuthor(
      name: 'Mira',
      facets: [
        ProfileFacet(name: 'темп', value: 'медленно'),
        ProfileFacet(name: 'еда', value: 'текстура'),
        ProfileFacet(name: 'настроение', value: 'тихое внимание'),
      ],
    );

    return const [
      PlaceExperience(
        id: 'secret-garden',
        placeName: 'Secret Garden',
        neighborhood: 'District 1',
        coordinate: LatLng(10.7752, 106.7009),
        emotion: ExperienceEmotion.comfort,
        intensity: 4,
        context: 'крыша, зелень, хороший разговор',
        dish: DishSignal(
          name: 'caramelized pork clay pot',
          reason: 'мягко собирает вечер',
          texture: 'густой соус, рис, тепло',
        ),
        author: author,
        createdLabel: 'вчера',
      ),
      PlaceExperience(
        id: 'banh-mi-huynh-hoa',
        placeName: 'Banh Mi Huynh Hoa',
        neighborhood: 'District 1',
        coordinate: LatLng(10.7716, 106.6920),
        emotion: ExperienceEmotion.energy,
        intensity: 5,
        context: 'быстро, плотно, без церемоний',
        dish: DishSignal(
          name: 'banh mi dac biet',
          reason: 'если хочется прямого удара вкуса',
          texture: 'хруст, паштет, травы',
        ),
        author: author,
        createdLabel: '3 дня назад',
      ),
      PlaceExperience(
        id: 'the-workshop',
        placeName: 'The Workshop',
        neighborhood: 'District 1',
        coordinate: LatLng(10.7740, 106.7042),
        emotion: ExperienceEmotion.focus,
        intensity: 4,
        context: 'ноутбук, кофе, два часа ясности',
        dish: DishSignal(
          name: 'egg coffee',
          reason: 'сладкая пауза между задачами',
          texture: 'крем, горечь, плотность',
        ),
        author: author,
        createdLabel: 'на неделе',
      ),
      PlaceExperience(
        id: 'oc-dao',
        placeName: 'Oc Dao',
        neighborhood: 'District 1',
        coordinate: LatLng(10.7607, 106.6898),
        emotion: ExperienceEmotion.curiosity,
        intensity: 5,
        context: 'пробовать руками, спорить, заказывать еще',
        dish: DishSignal(
          name: 'grilled scallops',
          reason: 'блюдо ведет сильнее, чем место',
          texture: 'дым, масло, арахис',
        ),
        author: author,
        createdLabel: 'месяц назад',
      ),
    ];
  }
}