using Common;
using Common.AppSettings;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using MultiTerm.Core.Model;
using MultiTerm.Core.Types;
using MultiTerm.Protocols.Model;

namespace MultiTerm.Core.ViewModel;

public partial class SendReceiveViewModel : TerminalViewModel
{
    public override TerminalViewType ViewType => TerminalViewType.SendReceive;

    #region Observable Properties
    /// <summary>
    /// Holds communication data that was received via the communication protocol.
    /// </summary>
    [ObservableProperty]
    private MultiFormatDataViewModel receivedData;

    /// <summary>
    /// Holds communication data that was sent via the communication protocol.
    /// </summary>
    [ObservableProperty]
    private MultiFormatDataViewModel sentData;

    /// <summary>
    /// Model for sendable data.
    /// </summary>
    [ObservableProperty]
    private MultiFormatString sendableData = new();
    #endregion

    /// <summary>
    /// Constructor.
    /// </summary>
    /// <param name="appSettings"></param>
    public SendReceiveViewModel(IAppSettingsProvider appSettings, IMessenger messenger, IContext context) : base(appSettings, messenger) 
    {
        // create new Communication data containers
        this.receivedData = new(context);
        this.sentData = new(context);
    }

    /// <summary>
    /// Send command.
    /// </summary>
    [RelayCommand]
    private void Send()
    {
        // send data
        if (this.SendToCommunicationProtocol(this.SendableData.GetBytes()))
        {
            // add to history
            this.AddToSendHistory(this.SendableData);
            // clear textbox if send was successful
            this.SendableData.Clear();
        }
    }

    protected override void HandleInsertElementFromHistory(object? element)
    {
        // null element received => insert empty
        if (element == null) 
        { 
            this.SendableData = new MultiFormatString();
            return;
        }

        // otherwise check type
        if(element is not MultiFormatString mfs) 
        { 
            throw new Exception($"'{HandleInsertElementFromHistory}()' in {nameof(SendReceiveViewModel)} got wrong type of element. Got Type: {element.GetType()}"); 
        }

        // overwrite if type is valid
        this.SendableData = mfs;
    }

    public override void DisplayNewReceivedData(IEnumerable<ExtendedByte> newData)
    {
        this.ReceivedData!.HandleNewData(newData);
    }

    public override void DisplayNewSentData(IEnumerable<ExtendedByte> newData)
    {
        this.SentData!.HandleNewData(newData);
    }

    protected override void ActOnDataDisplayNewlineSeparatorTypeChanged(NewlineSeparatorType newType)
    {
        // triggers rearranging the displayed data with the new NewlineSeparatorType
        this.ReceivedData!.NewlineSeparator = newType;
        this.SentData!.NewlineSeparator = newType;
    }
}