Chat/ChatController/ChatKlassen/ChatMessage.cs

using System;
using System.ComponentModel;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Media;
using ChatController.Core;
using ChatController.Utilities;
using static System.Windows.HorizontalAlignment;

namespace ChatController.ChatKlassen
{
    public class ChatMessage
    {
        public int TimeStringMaxWidth => IsSeparator ? int.MaxValue : 350;

        public int MessageMaxWidth => IsSeparator ? int.MaxValue : 500;

        public string SeparatorTimeString => SendTime.ToString("dd. MMMM yyyy");

        public bool IsSeparator { get; set; }

        public long FileSize { get; set; }

        // Separator
        public ChatMessage(DateTime sendTime)
        {
            Id = Guid.NewGuid();
            IsSeparator = true;
            SendTime = sendTime;

            MessageType = ChatMessageType.Separator;
        }

        //Chat-Ansicht 
        public ChatMessage(string username, string message, DateTime sendtime, bool isme, long pGroupId, long fileSize)
        {
            Id = Guid.NewGuid();
            Username = username;
            UserMessage = message;
            SendTime = sendtime;
            IsMyMessage = isme;

            GroupId = pGroupId;

            MessageType = IsHyperlink(message) ? ChatMessageType.Hyperlink : ChatMessageType.Message;
        }
        
        // Image-Ansicht  
        public ChatMessage(string username, string message, DateTime sendtime, bool isme, ImageSource image, string originalImage, string imageName, long pGroupId, long fileSize)
        {
            Id = Guid.NewGuid();
            Username = username;
            UserMessage = message;
            SendTime = sendtime;
            ImageSources = image;
            IsMyMessage = isme;

            OriginalImage = originalImage;
            OriginalImageName = imageName;
         
            GroupId = pGroupId;

            MessageType = ChatMessageType.Image;
        }

        //Dokumenten-Ansicht
        public ChatMessage(string pUsername, string pMessageText, DateTime pSendTime, string pSmallerImagePath, bool pIsLoggedInUsersMessage, string pUrl, long pGroupId, long fileSize)
        {
            Id          = Guid.NewGuid();
            Username    = pUsername;
            UserMessage = pMessageText;
            SendTime    = pSendTime;
            IsMyMessage = pIsLoggedInUsersMessage;

            FilePath = pUrl;

            var cache = OwnChatCache.GetInstance();

            var imgSrc = cache.GetImageSourceFromCache($"group-{pGroupId}");

            if(imgSrc == null)
            {
                imgSrc = Utils.CreateImageSourceFromPath(pSmallerImagePath);
            }

            Thumbnail = imgSrc;
            
            GroupId = pGroupId;

            MessageType = ChatMessageType.Document;
        }

        public ChatMessageType MessageType { get; }

        public ImageSource Thumbnail { get; }

        private static readonly Regex _UrlRegex = new Regex(@"(?#Protocol)^(http(?:s?)\:(\/\/|\\\\)|(w){3}(2|3)?\.{1})(?#Subdomains)(?:(?:[-\w]+\.)+(?#TopLevel Domains)(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|travel|[a-z]{2}))(?#Port)(?::[\d]{1,5})?(?#Directories)(?:(?:(?:/(?:[-\w~!$+|.,=]|%[a-f\d]{2})+)+|/)+|\?|#)?(?#Query)(?:(?:\?(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)(?:&(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)*)*(?#Anchor)(?:#(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)?");

        public static bool IsHyperlink(string word)
        {
            if(word == null)
            {
                return false;
            }

            try
            {
                if (word.IndexOfAny(@":.\/".ToCharArray()) != -1)
                {
                    if (_UrlRegex.IsMatch(word))
                    {
                        var uri = new Uri(word, UriKind.RelativeOrAbsolute);

                        if (!uri.IsAbsoluteUri)
                        {
                            uri = new Uri(@"http://" + word, UriKind.Absolute);
                        }

                        if (uri.IsAbsoluteUri)
                        {
                            return true;
                        }
                    }
                    else
                    {
                        return false;
                    }
                }
            }
            catch (Exception e)
            {
                return false;
            }

            return false;
        }

        public bool IsMyMessage { get; set; }

        public string Username { get; }

        public string UserMessage { get; }

        public DateTime SendTime { get; }

        public string UserTimeStringLeft => IsMyMessage ? null : Username;

        public string UserTimeStringRight => SendTimeString;

        public string SendTimeString => SendTime.Date == DateTime.Today ? $"Heute {SendTime:HH:mm}" : SendTime.ToString("dd. MMM HH:mm");

        public Brush BorderBrush => IsSeparator ? new SolidColorBrush(Colors.Transparent) : IsMyMessage ? new SolidColorBrush(Color.FromRgb(255, 90, 0)) : new SolidColorBrush(Color.FromRgb(229, 229, 229));

        public Brush HighlightedBorderBrush => IsSeparator ? new SolidColorBrush(Colors.Transparent) : IsMyMessage ? new SolidColorBrush(Color.FromRgb(255, 153, 153)) : new SolidColorBrush(Color.FromRgb(247, 247, 247));

        public Brush Foreground => new BrushConverter().ConvertFromString("#505050") as SolidColorBrush;

        public HorizontalAlignment HorizontalAlignmentValue => IsSeparator ? HorizontalAlignment.Stretch : IsMyMessage ? Right : Left;

        public string OriginalImage { get; }

        public string OriginalImageName { get; }
        
        public Visibility ChatVisibility => MessageType == ChatMessageType.Message ? Visibility.Visible : Visibility.Collapsed;

        public Visibility HyperlinkVisibility => MessageType == ChatMessageType.Hyperlink ? Visibility.Visible : Visibility.Collapsed;

        public Visibility PictureVisibility => MessageType == ChatMessageType.Image ? Visibility.Visible : Visibility.Collapsed;

        public Visibility PicturePlaceHolderVisibility => MessageType == ChatMessageType.DefaultImage ? Visibility.Visible : Visibility.Collapsed;

        public Visibility DokumentVisibility => MessageType == ChatMessageType.Document ? Visibility.Visible : Visibility.Collapsed;

        public ImageSource ImageSources { get; }

        public object FilePath { get; }  

        public long GroupId { get; }

        public event PropertyChangedEventHandler PropertyChanged;

        public Guid Id { get; }

        public Uri UserMessageAsUri
        {
            get
            {
                if(IsHyperlink(UserMessage))
                {
                    if(!UserMessage.Contains("http"))
                    {
                        return new Uri("http://" + UserMessage);
                    }
                }

                return null;
            }
        }

        protected virtual void OnPropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            handler?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public override bool Equals(object obj)
        {
            if(obj is ChatMessage message)
            {
                if(message.IsSeparator && IsSeparator)
                {
                    return SendTime == message.SendTime;
                }

                return message.Id.Equals(Id);
            }

            return false;
        }

        public override string ToString()
        {
            return SendTime.ToString("dd.MM.yyyy HH:mm:ss");
        }

        public override int GetHashCode()
        {
            return Id.GetHashCode() << 16;
        }
    }
}