import 'package:html/dom.dart' as dom;
import 'package:html/parser.dart' as parser;

class HtmlUtil {
  const HtmlUtil._();

  static String? getTitle(dynamic input) =>
      parser.parse(input).head?.querySelector('title')?.text;

  static dom.Element? getBody(dynamic input) => parser.parse(input).body;

  static bool hasMatch(dom.Element? element, {required String selector}) =>
      element?.querySelector(selector) != null;

  static Iterable<String>? getIds(dom.Element? element,
          {required String selector}) =>
      element
          ?.querySelectorAll(selector)
          .map((dom.Element element) => element.id);

  static Map<String, String>? getHiddenFormValues(dynamic input) {
    final Iterable<dom.Element>? hiddenInputs = getBody(input)
        ?.getElementsByTagName('form')
        .first
        .querySelectorAll("input[type='hidden']");
    return <String, String>{
      if (hiddenInputs != null)
        for (dom.Element hiddenInput in hiddenInputs)
          hiddenInput.attributes['name']!: hiddenInput.attributes['value']!
    };
  }
}