src/Carnac.Logic/Models/Message.cs

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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows.Media;

namespace Carnac.Logic.Models
{
    public sealed class Message
    {
        readonly ReadOnlyCollection<string> textCollection;
        readonly ReadOnlyCollection<KeyPress> keys;
        readonly string processName;
        readonly ImageSource processIcon;
        readonly string shortcutName;
        readonly bool canBeMerged;
        readonly bool isShortcut;
        readonly bool isDeleting;
        readonly DateTime lastMessage;
        readonly Message previous;

        public Message()
        {
            lastMessage = DateTime.Now;
        }

        public Message(KeyPress key)
            : this()
        {
            processName = key.Process.ProcessName;
            processIcon = key.Process.ProcessIcon;
            canBeMerged = !key.HasModifierPressed;

            keys = new ReadOnlyCollection<KeyPress>(new[] { key });
            textCollection = new ReadOnlyCollection<string>(CreateTextSequence(key).ToArray());
        }

        public Message(IEnumerable<KeyPress> keys, KeyShortcut shortcut)
            : this()
        {
            var allKeys = keys.ToArray();
            var distinctProcessName = allKeys.Select(k => k.Process.ProcessName)
                .Distinct()
                .ToArray();
            if (distinctProcessName.Count() != 1)
                throw new InvalidOperationException("Keys are from different processes");

            processName = distinctProcessName.Single();
            processIcon = allKeys.First().Process.ProcessIcon;
            shortcutName = shortcut.Name;
            isShortcut = true;
            canBeMerged = false;

            this.keys = new ReadOnlyCollection<KeyPress>(allKeys);

            var textSeq = CreateTextSequence(allKeys).ToList();
            if (!string.IsNullOrEmpty(shortcutName))
                textSeq.Add(string.Format(" [{0}]", shortcutName));
            textCollection = new ReadOnlyCollection<string>(textSeq);
        }