import 'dart:convert';
import 'package:html/parser.dart' as html_parser;
import 'package:http/http.dart' as http;

class ScrapedRecipe {
  final String title;
  final List<String> ingredients;
  final List<String> instructions;
  final double? proteinGrams;

  ScrapedRecipe({
    required this.title,
    required this.ingredients,
    required this.instructions,
    this.proteinGrams,
  });
}

class RecipeScraperService {
  Future<ScrapedRecipe?> extractFromUrl(String url) async {
    final response = await http.get(Uri.parse(url));
    if (response.statusCode != 200) return null;

    final document = html_parser.parse(response.body);
    final scriptTags =
        document.querySelectorAll('script[type="application/ld+json"]');

    for (final tag in scriptTags) {
      try {
        final data = jsonDecode(tag.text);
        if (data is Map<String, dynamic> && data['@type'] == 'Recipe') {
          return _parseJsonLd(data);
        } else if (data is List) {
          final recipe = data.firstWhere((e) => e['@type'] == 'Recipe',
              orElse: () => null);
          if (recipe != null) return _parseJsonLd(recipe);
        }
      } catch (_) {
        continue;
      }
    }
    return null;
  }

  ScrapedRecipe _parseJsonLd(Map<String, dynamic> json) {
    return ScrapedRecipe(
      title: json['name'] ?? 'Untitled Recipe',
      ingredients: List<String>.from(json['recipeIngredient'] ?? []),
      instructions: (json['recipeInstructions'] as List? ?? [])
          .map((step) =>
              step is Map ? step['text']?.toString() ?? '' : step.toString())
          .toList(),
      proteinGrams: double.tryParse(
        json['nutrition']?['proteinContent']
                ?.toString()
                .replaceAll(RegExp(r'[^0-9.]'), '') ??
            '',
      ),
    );
  }
}