MultiTerm/MultiTerm.Core/ViewModel/ShellViewModel.cs

using Common.AppSettings;
using Common.Logging;
using Common.Helpers;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using MultiTerm.Core.Factories;
using System.Collections.ObjectModel;
using MultiTerm.Core.Types;
using MultiTerm.Protocols.Types;
using CommunityToolkit.Mvvm.Messaging;
using Common.Messaging;

namespace MultiTerm.Core.ViewModel;

public partial class ShellViewModel : ObservableObject, IRecipient<IUserInterfaceMessage>
{
    private const string defaultReceiveNewlineSeparatorAppSettingsKey = "DefaultReceiveNewlineSeparator";
    private const string defaultSendNewlineSeparatorAppSettingsKey = "DefaultSendNewlineSeparator";

    #region Terminal collection
    [ObservableProperty]
    private ObservableCollection<ITerminalViewModel> terminalViewModels = new();

    [ObservableProperty]
    private ITerminalViewModel? selectedTerminalViewModel;
    #endregion

    #region Settings Menu Bar
    [ObservableProperty]
    private NewlineSeparatorType defaultReceiveNewlineSeparator = NewlineSeparatorType.None;

    [ObservableProperty]
    private NewlineSeparatorType defaultSendNewlineSeparator = NewlineSeparatorType.None;
    #endregion

    #region New Terminal Context Menu
    [ObservableProperty]
    private TerminalViewType selectedTerminalViewType = TerminalViewType.SendReceive;
    #endregion

    #region Status Bar
    [ObservableProperty]
    private string statusBarMessage = "";

    [ObservableProperty]
    private MessageImportance statusBarMessageImportance = MessageImportance.Normal;
    #endregion

    private readonly ITerminalViewModelFactory terminalViewModelFactory;
    private readonly ILogger logger;
    private readonly IAppSettingsProvider appSettings;
    private readonly IMessenger messenger;

    public ShellViewModel(ITerminalViewModelFactory terminalViewModelFactory, ILogger logger, IAppSettingsProvider appSettings, IMessenger messenger)
    {
        this.terminalViewModelFactory = terminalViewModelFactory;
        this.logger = logger;
        this.appSettings = appSettings;
        this.messenger = messenger;

        // intialize values from app settings
        this.LoadFromAppSettings();

        // register to messages
        this.messenger.Register(this);

        // TEMP Init
        this.AppendTerminalWithSelectedViewType(ProtocolType.Serial);
    }

    [RelayCommand]
    private void AppendTerminalWithSelectedViewType(ProtocolType protocolType)
    {
        this.logger.LogInfo($"Adding new Terminal with ViewType '{this.SelectedTerminalViewType}' and ProtocolType '{protocolType}'", nameof(ShellViewModel));
        this.AppendConfiguredTerminal(this.terminalViewModelFactory.Create(this.SelectedTerminalViewType, protocolType));
    }


    private void AppendConfiguredTerminal(ITerminalViewModel? newTerminal)
    {
        // guard null value
        if(newTerminal == null) { return; }

        // add to collection and register closing event handler
        this.TerminalViewModels.Add(newTerminal);
        newTerminal.ClosingEvent += Terminal_ClosingEvent;

        // set as selected
        this.SelectedTerminalViewModel = newTerminal;
    }

    private void Terminal_ClosingEvent(object? sender, EventArgs e)
    {
        if(sender is not ITerminalViewModel tvm) { throw new ArgumentException($"{nameof(Terminal_ClosingEvent)} failed to convert sender to {nameof(ITerminalViewModel)}"); }
        this.RemoveTerminal(tvm);
    }

    private void RemoveTerminal(ITerminalViewModel terminalToRemove)
    {
        // guard null value
        if(terminalToRemove == null) { return; }

        this.TerminalViewModels.Remove(terminalToRemove);
    }

    #region App Settings handling
    private void LoadFromAppSettings()
    {
        // initialize newline separators from persistent settings
        this.appSettings.TryReadSettingOrAddDefault(defaultReceiveNewlineSeparatorAppSettingsKey, out string settingValueReceiveNLSep, NewlineSeparatorType.None.ToString());
        this.DefaultReceiveNewlineSeparator = EnumHelpers.ParseEnum<NewlineSeparatorType>(settingValueReceiveNLSep);
        this.appSettings.TryReadSettingOrAddDefault(defaultSendNewlineSeparatorAppSettingsKey, out string settingValueSendNLSep, NewlineSeparatorType.None.ToString());
        this.DefaultSendNewlineSeparator = EnumHelpers.ParseEnum<NewlineSeparatorType>(settingValueSendNLSep);
    }

    partial void OnDefaultReceiveNewlineSeparatorChanged(NewlineSeparatorType value)
    {
        // update setting in app settings
        this.appSettings.WriteSetting(defaultReceiveNewlineSeparatorAppSettingsKey, value.ToString());
    }

    partial void OnDefaultSendNewlineSeparatorChanged(NewlineSeparatorType value)
    {
        // update setting in app settings
        this.appSettings.WriteSetting(defaultSendNewlineSeparatorAppSettingsKey, value.ToString());
    }
    #endregion

    #region Messaging handling
    public void Receive(IUserInterfaceMessage message)
    {
        this.StatusBarMessage = message.ToString();
        this.StatusBarMessageImportance = message.Importance;
    }
    #endregion
}