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

import '../models/place_models.dart';

final placeControllerProvider = NotifierProvider<PlaceController, PlaceState>(
  PlaceController.new,
);

class PlaceState {
  const PlaceState({
    required this.intent,
    required this.places,
    required this.selectedPlaceId,
    required this.reviewDraft,
  });

  final UserIntent intent;
  final List<PlaceRecommendation> places;
  final String? selectedPlaceId;
  final VoiceReviewDraft reviewDraft;

  List<PlaceRecommendation> get recommendations {
    final wanted = intent.traits;
    final ranked = [...places]
      ..sort((a, b) {
        final aScore = a.traits.intersection(wanted).length;
        final bScore = b.traits.intersection(wanted).length;
        return bScore.compareTo(aScore);
      });
    return ranked.take(4).toList();
  }

  PlaceRecommendation? get selectedPlace {
    for (final place in places) {
      if (place.id == selectedPlaceId) {
        return place;
      }
    }
    return recommendations.isEmpty ? null : recommendations.first;
  }

  PlaceState copyWith({
    UserIntent? intent,
    List<PlaceRecommendation>? places,
    String? selectedPlaceId,
    VoiceReviewDraft? reviewDraft,
  }) {
    return PlaceState(
      intent: intent ?? this.intent,
      places: places ?? this.places,
      selectedPlaceId: selectedPlaceId ?? this.selectedPlaceId,
      reviewDraft: reviewDraft ?? this.reviewDraft,
    );
  }
}

class PlaceController extends Notifier<PlaceState> {
  @override
  PlaceState build() {
    final places = _seedPlaces();
    return PlaceState(
      intent: UserIntent.exhale,
      places: places,
      selectedPlaceId: places.first.id,
      reviewDraft: const VoiceReviewDraft(
        placeName: '',
        duration: Duration.zero,
        extractedTraits: {},
        suggestedIntents: {},
        evidence: [],
      ),
    );
  }

  void selectIntent(UserIntent intent) {
    PlaceRecommendation? next;
    for (final place in state.places) {
      if (place.traits.intersection(intent.traits).isNotEmpty) {
        next = place;
        break;
      }
    }
    state = state.copyWith(intent: intent, selectedPlaceId: next?.id);
  }

  void selectPlace(String placeId) {
    state = state.copyWith(selectedPlaceId: placeId);
  }

  void setReviewPlace(String placeName) {
    state = state.copyWith(
      reviewDraft: state.reviewDraft.copyWith(placeName: placeName),
    );
  }

  void setReviewDuration(Duration duration) {
    state = state.copyWith(
      reviewDraft: state.reviewDraft.copyWith(duration: duration),
    );
  }

  void analyzeVoiceReview() {
    final placeName = state.reviewDraft.placeName.trim().isEmpty
        ? 'Новое место'
        : state.reviewDraft.placeName.trim();

    state = state.copyWith(
      reviewDraft: state.reviewDraft.copyWith(
        placeName: placeName,
        duration: state.reviewDraft.duration.inSeconds < 30
            ? const Duration(seconds: 36)
            : state.reviewDraft.duration,
        extractedTraits: {
          PlaceTrait.cozy,
          PlaceTrait.private,
          PlaceTrait.beautiful,
          PlaceTrait.calm,
        },
        suggestedIntents: {UserIntent.exhale, UserIntent.date},
        evidence: [
          'можно нормально поговорить',
          'место мягкое, не давит',
          'туда хочется привести человека вечером',
        ],
      ),
    );
  }

  void publishReview({LatLng? coordinate}) {
    final draft = state.reviewDraft;
    final place = PlaceRecommendation(
      id: 'local-${DateTime.now().microsecondsSinceEpoch}',
      name: draft.placeName.trim().isEmpty ? 'Новое место' : draft.placeName,
      area: 'добавлено голосом',
      photoUrls: const [
        'https://images.unsplash.com/photo-1554118811-1e0d58224f24?auto=format&fit=crop&w=600&q=80',
        'https://images.unsplash.com/photo-1514933651103-005eec06c04b?auto=format&fit=crop&w=600&q=80',
        'https://images.unsplash.com/photo-1555396273-367ea4eb4db5?auto=format&fit=crop&w=600&q=80',
      ],
      coordinate: coordinate ?? const LatLng(10.7729, 106.7004),
      traits: draft.extractedTraits.isEmpty
          ? {PlaceTrait.cozy, PlaceTrait.calm}
          : draft.extractedTraits,
    );

    state = state.copyWith(
      places: [place, ...state.places],
      selectedPlaceId: place.id,
      reviewDraft: const VoiceReviewDraft(
        placeName: '',
        duration: Duration.zero,
        extractedTraits: {},
        suggestedIntents: {},
        evidence: [],
      ),
    );
  }

  List<PlaceRecommendation> _seedPlaces() {
    return const [
      PlaceRecommendation(
        id: 'secret-garden',
        name: 'Secret Garden',
        area: 'District 1',
        photoUrls: [
          'https://images.unsplash.com/photo-1552566626-52f8b828add9?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1559339352-11d035aa65de?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1521017432531-fbd92d768814?auto=format&fit=crop&w=600&q=80',
        ],
        coordinate: LatLng(10.7752, 106.7009),
        traits: {
          PlaceTrait.calm,
          PlaceTrait.cozy,
          PlaceTrait.private,
          PlaceTrait.beautiful,
          PlaceTrait.social,
        },
      ),
      PlaceRecommendation(
        id: 'workshop',
        name: 'The Workshop',
        area: 'District 1',
        photoUrls: [
          'https://images.unsplash.com/photo-1495474472287-4d71bcdd2085?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1501339847302-ac426a4a7cbb?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1511920170033-f8396924c348?auto=format&fit=crop&w=600&q=80',
        ],
        coordinate: LatLng(10.7740, 106.7042),
        traits: {
          PlaceTrait.focused,
          PlaceTrait.calm,
          PlaceTrait.neutral,
          PlaceTrait.solo,
        },
      ),
      PlaceRecommendation(
        id: 'oc-dao',
        name: 'Oc Dao',
        area: 'District 1',
        photoUrls: [
          'https://images.unsplash.com/photo-1555396273-367ea4eb4db5?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1544025162-d76694265947?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1551218808-94e220e084d2?auto=format&fit=crop&w=600&q=80',
        ],
        coordinate: LatLng(10.7607, 106.6898),
        traits: {
          PlaceTrait.alive,
          PlaceTrait.open,
          PlaceTrait.social,
          PlaceTrait.unusual,
        },
      ),
      PlaceRecommendation(
        id: 'l-usine',
        name: 'L\'Usine',
        area: 'Dong Khoi',
        photoUrls: [
          'https://images.unsplash.com/photo-1514933651103-005eec06c04b?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1550966871-3ed3cdb5ed0c?auto=format&fit=crop&w=600&q=80',
          'https://images.unsplash.com/photo-1551632436-cbf8dd35adfa?auto=format&fit=crop&w=600&q=80',
        ],
        coordinate: LatLng(10.7755, 106.7038),
        traits: {
          PlaceTrait.status,
          PlaceTrait.beautiful,
          PlaceTrait.private,
          PlaceTrait.clear,
        },
      ),
    ];
  }
}