import 'package:comunic/models/displayed_content.dart';
import 'package:comunic/utils/bbcode_parser.dart';
import 'package:comunic/utils/input_utils.dart';
import 'package:comunic/utils/navigation_utils.dart';
import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';

/// Text widget
///
/// The content passed to this widget is automatically parsed
///
/// @author Pierre Hubert

class TextWidget extends StatelessWidget {
  final DisplayedString content;
  final bool parseBBcode;
  final TextStyle style;

  const TextWidget({
    Key key,
    @required this.content,
    this.parseBBcode = false,
    this.style,
  })  : assert(content != null),
        assert(parseBBcode != null),
        super(key: key);

  @override
  Widget build(BuildContext context) {
    if (this.content.isNull || this.content.isEmpty) return Text("");

    var content = this.content.parsedString;

    // Parse BBcode
    if (parseBBcode)
      return BBCodeParsedWidget(
        text: content,
        parseCallback: (style, text) => _parseLinks(context, text, style),
      );

    // Just parse link
    return RichText(
      text: TextSpan(children: _parseLinks(context, content, style)),
    );
  }

  /// Sub parse function
  List<InlineSpan> _parseLinks(
      BuildContext context, String text, TextStyle style) {
    if (style == null) style = TextStyle();

    var buff = StringBuffer();
    final list = new List<InlineSpan>();

    // Change word function
    final changeWordType = () {
      list.add(TextSpan(style: style, text: buff.toString()));
      buff.clear();
    };

    for (final word in text.replaceAll("\n", " \n ").split(" ")) {
      // Line break
      if (word == "\n") {
        buff.write("\n");
        continue;
      }

      // Check if it is an URL
      if (word.startsWith("https://") || word.startsWith("http://")) {
        changeWordType();

        list.add(
          WidgetSpan(
            child: InkWell(
              child: Text(
                word,
                style: style.copyWith(color: Colors.blueAccent),
              ),
              onTap: () => launch(word),
            ),
          ),
        );

        buff.write(" ");
      }

      // Check if it is a directory reference
      else if (validateDirectoryReference(word)) {
        changeWordType();

        list.add(
          WidgetSpan(
            child: InkWell(
              child: Text(
                word,
                style: style.copyWith(color: Colors.blueAccent),
              ),
              onTap: () => openVirtualDirectory(context, word),
            ),
          ),
        );

        buff.write(" ");
      }

      // Simple word
      else {
        buff.write(word);
        buff.write(" ");
      }
    }

    if (buff.isNotEmpty) changeWordType();

    return list;
  }
}