library quill_html_converter;

import 'package:dart_quill_delta/dart_quill_delta.dart';
import 'package:vsc_quill_delta_to_html/vsc_quill_delta_to_html.dart';

export 'package:vsc_quill_delta_to_html/vsc_quill_delta_to_html.dart';

/// A extension for [Delta] which comes from `flutter_quill` to extends
/// the functionality of it to support converting the [Delta] to/from HTML
extension DeltaHtmlExt on Delta {
  /// Convert the [Delta] instance to HTML Raw string
  ///
  /// It will run using the following steps:
  ///
  /// 1. Convert the [Delta] to json using [toJson]
  /// 2. Cast the json map as `List<Map<String, dynamic>>`
  /// 3. Pass it to the conventer `vsc_quill_delta_to_html` which is a package
  /// that designed specifically for converting the quill delta to html
  String toHtml({ConverterOptions? options}) {
    final json = toJson();
    final html = QuillDeltaToHtmlConverter(
      List.castFrom(json),
      options ?? defaultConverterOptions,
    ).convert();
    return html;
  }
}

ConverterOptions get defaultConverterOptions {
  return ConverterOptions(
    converterOptions: OpConverterOptions(
      customTagAttributes: (op) => parseStyle(op.attributes['style']),
    ),
  );
}

Map<String, String>? parseStyle(String? style, [Map<String, String>? attrs]) {
  if (style == null || style.isEmpty) return attrs;

  attrs ??= <String, String>{};

  for (var e in style.split(';')) {
    if ((e = e.trim()).isEmpty) break;
    var kv = e.split(':');
    if (kv.length < 2) break;
    var key = kv[0].trim();
    attrs[key] = kv[1].trim();
  }
  return attrs;
}