import 'package:flutter/widgets.dart';

import '../../../core/contracts/tmdb.dart';
import '../../../shared/mappers/tmdb_image_selector.dart';
import '../../../shared/mappers/tmdb_image_url.dart';
import '../../../shared/utils/format_utils.dart';
import '../utils/detail_helpers.dart';
import '../model/detail_hero_model.dart';
import '../model/detail_image_model.dart';
import '../model/detail_section_model.dart';
import '../model/detail_view_state.dart';
import '../widgets/tmdb_cast_section.dart';
import '../widgets/tmdb_recommendation_section.dart';


DetailViewState buildTmdbDetailViewState({
  required String mediaType,
  required TmdbEnrichedDetail? enriched,
  required TmdbRecommendation? seed,
  required String imageBaseUrl,
  required String language,
  required Widget? heroActions,
  required List<DetailSection> hitStateSections,
  required bool showSpinner,
}) {
  final detail = enriched?.detail;

  final title = (detail?.title.isNotEmpty ?? false)
      ? detail!.title
      : (seed?.title ?? '');
  final posterPath = detail?.posterPath ?? seed?.posterPath;
  final backdropPath = detail?.backdropPath ?? seed?.backdropPath;
  final voteAverage = detail?.voteAverage ?? seed?.voteAverage;
  final overview = (detail?.overview?.trim().isNotEmpty ?? false)
      ? detail!.overview!.trim()
      : (seed?.overview?.trim() ?? '');
  final tagline = detail?.tagline?.trim();

  final metaParts = <String>[];
  final year = yearOf(detail?.releaseDate);
  if (year != null) metaParts.add(year);
  final runtime = formatRuntimeMinutes(detail?.runtime);
  if (runtime != null) metaParts.add(runtime);

  final genreNames = [
    for (final g in detail?.genres ?? const <TmdbGenre>[])
      if (g.name.isNotEmpty) g.name,
  ];

  final cast = enriched?.credits?.cast ?? const <TmdbCastMember>[];
  final recommendations =
      enriched?.recommendations?.results ?? const <TmdbRecommendation>[];

  final posterUrl = TmdbImageUrl.poster(imageBaseUrl, posterPath);
  final backdropUrl = TmdbImageUrl.backdrop(imageBaseUrl, backdropPath);
  final logoUrl = TmdbImageSelector.logoUrl(
    enriched?.images,
    imageBaseUrl,
    language: language,
  );
  final fallbackUrls = TmdbImageSelector.buildFallbackUrls(
    primaryUrl: backdropUrl,
    candidates: [posterUrl],
  );

  final sections = <DetailSection>[
    ...hitStateSections,
    if (cast.isNotEmpty)
      DetailSection(
        id: 'tmdb_cast',
        child: TmdbCastSection(cast: cast, imageBaseUrl: imageBaseUrl),
      ),
    if (recommendations.isNotEmpty)
      DetailSection(
        id: 'tmdb_recommendations',
        child: TmdbRecommendationSection(
          items: recommendations,
          imageBaseUrl: imageBaseUrl,
          fallbackMediaType: mediaType,
        ),
      ),
  ];

  return DetailViewState(
    image: DetailImageModel(
      backdropUrl: backdropUrl,
      fallbackUrls: fallbackUrls,
    ),
    navTitle: title,
    hero: DetailHeroModel(
      title: title,
      logoUrl: logoUrl,
      posterUrl: posterUrl,
      imageHeaders: null,
      rating: voteAverage,
      metaParts: metaParts,
      genres: genreNames,
      tagline: tagline,
      overview: overview,
      actions: heroActions,
    ),
    sections: sections,
    showLoadingBelowHero: showSpinner,
  );
}