Unigram/Telegram/Converters/InitialNameStringConverter.cs at develop · UnigramDev/Unigram · GitHub

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//
// Copyright Fela Ameghino & Contributors 2015-2025
//
// Distributed under the GNU General Public License v3.0. (See accompanying
// file LICENSE or copy at https://www.gnu.org/licenses/gpl-3.0.txt)
//
using System;
using System.Globalization;
using Telegram.Td.Api;
using Windows.UI.Xaml.Data;

namespace Telegram.Converters
{
    public partial class InitialNameStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, string language)
        {
            return Convert(value);
        }

        public static string Convert(object value)
        {
            if (value == null)
            {
                return null;
            }

            var word1 = string.Empty;
            var word2 = string.Empty;

            if (value is User user)
            {
                word1 = user.FirstName ?? string.Empty;
                word2 = user.LastName ?? string.Empty;
            }
            else if (value is Chat chat)
            {
                var words = chat.Title.Split(new char[] { ' ' });
                if (words.Length > 1 && chat.Type is ChatTypePrivate || chat.Type is ChatTypeSecret)
                {
                    word1 = words[0];
                    word2 = words[words.Length - 1];
                }
                else if (words.Length > 0)
                {
                    word1 = words[0];
                    word2 = string.Empty;
                }
            }
            else if (value is ChatInviteLinkInfo info)
            {
                var words = info.Title.Split(new char[] { ' ' });
                if (words.Length > 0)
                {
                    word1 = words[0];
                    word2 = string.Empty;
                }
            }
            else if (value is string str)
            {
                var words = str.Split(new char[] { ' ' });
                if (words.Length > 1)
                {
                    word1 = words[0];
                    word2 = words[words.Length - 1];
                }
                else
                {
                    word1 = words[0];
                    word2 = string.Empty;
                }
            }

            return Convert(word1, word2);
        }

        public static string Convert(string title)
        {
            title ??= string.Empty;

            var word1 = string.Empty;
            var word2 = string.Empty;

            var words = title.Split(new char[] { ' ' });
            if (words.Length > 0)
            {
                word1 = words[0];
                word2 = string.Empty;
            }

            return Convert(word1, word2);
        }

        public static string Convert(string word1, string word2)
        {
            word1 ??= string.Empty;
            word2 ??= string.Empty;

            var si1 = StringInfo.GetTextElementEnumerator(word1);
            var si2 = StringInfo.GetTextElementEnumerator(word2);

            word1 = si1.MoveNext() ? si1.GetTextElement() : string.Empty;
            word2 = si2.MoveNext() ? si2.GetTextElement() : string.Empty;

            return string.Format("{0}{1}", word1, word2).Trim().ToUpperInvariant();
        }

        public object ConvertBack(object value, Type targetType, object parameter, string language)
        {
            throw new NotSupportedException();
        }
    }
}