import 'package:markdown/markdown.dart' as md;

/// Parses `[[Note Title]]` wikilinks into anchor elements with a custom
/// `wikilink://<encoded-title>` href, handled by the app's onTapLink callback.
class WikilinkSyntax extends md.InlineSyntax {
  WikilinkSyntax() : super(r'\[\[([^\[\]\n]+)\]\]');

  @override
  bool onMatch(md.InlineParser parser, Match match) {
    final title = match[1]!.trim();
    if (title.isEmpty) return false;
    final anchor = md.Element.text('a', title);
    anchor.attributes['href'] = 'wikilink://${Uri.encodeComponent(title)}';
    parser.addNode(anchor);
    return true;
  }
}

/// GitHub-flavored markdown extended with [[wikilink]] support.
/// Use this as the extensionSet wherever note bodies are rendered.
final wikilinkExtensionSet = md.ExtensionSet(
  md.ExtensionSet.gitHubFlavored.blockSyntaxes,
  [WikilinkSyntax(), ...md.ExtensionSet.gitHubFlavored.inlineSyntaxes],
);