import 'dart:convert';

import 'package:flutter/services.dart' show rootBundle;

import 'species_repository.dart';

const _catalogAsset = 'assets/catalog/species.json';

/// Parses the bundled catalog JSON into [SpeciesSeed]s. Kept separate from asset
/// loading so it is trivially unit-testable without a Flutter binding.
List<SpeciesSeed> parseSpeciesCatalog(String jsonString) {
  final data = jsonDecode(jsonString) as Map<String, dynamic>;
  final entries = (data['species'] as List).cast<Map<String, dynamic>>();
  return entries.map((e) {
    final common = (e['common'] as Map<String, dynamic>? ?? const {}).map(
      (lang, names) => MapEntry(lang, (names as List).cast<String>()),
    );
    return SpeciesSeed(
      scientificName: e['scientific_name'] as String,
      family: e['family'] as String?,
      wikidataQid: e['wikidata_qid'] as String?,
      gbifKey: (e['gbif_key'] as num?)?.toInt(),
      commonNames: common,
      viabilityYears: (e['viability_years'] as num?)?.toInt(),
    );
  }).toList();
}

/// Loads and parses the bundled species catalog asset.
Future<List<SpeciesSeed>> loadBundledSpecies() async {
  final jsonString = await rootBundle.loadString(_catalogAsset);
  return parseSpeciesCatalog(jsonString);
}

/// Version of the bundled catalog, mirrored from the asset's `version` field
/// (written by `tool/gen_species_catalog.dart`). A test asserts the two stay in
/// sync. The app records the version it last seeded and skips the ~1.5 MB parse
/// and the table scan in [SpeciesRepository.seedBundled] on every subsequent
/// launch — so bumping this (alongside the asset) is what triggers a one-time
/// re-seed after the catalog changes.
const int speciesCatalogVersion = 3;

/// Reads just the `version` field from a catalog JSON string. Used by the sync
/// test to keep [speciesCatalogVersion] aligned with the asset.
int parseSpeciesCatalogVersion(String jsonString) =>
    (jsonDecode(jsonString) as Map<String, dynamic>)['version'] as int;