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

namespace MultiTerm.Protocols.Serial;

public partial class SerialProtocolSettingsViewModel : ProtocolSettingsViewModel, ISerialProtocolSettings
{
    public override ProtocolType ProtocolType => ProtocolType.Serial;

    [ObservableProperty]
    private int baudRate = 115200;

    [ObservableProperty]
    private string portName;

    [ObservableProperty]
    private Parity parity = Parity.None;

    [ObservableProperty]
    private int dataBits = 8;

    [ObservableProperty]
    private StopBits stopBits = StopBits.One;

    [ObservableProperty]
    private Handshake handshake = Handshake.None;

    [ObservableProperty]
    private IEnumerable<string> comPorts = Array.Empty<string>();

    [RelayCommand]
    private void ReloadComPorts()
    {
        this.ComPorts = SerialProtocol.GetPortNames();
        // select first COM port, if none is selected yet and there are some available
        if (String.IsNullOrEmpty(this.PortName) && this.ComPorts.Any())
        {
            this.PortName = this.ComPorts.First();
        }
    }

    public SerialProtocolSettingsViewModel(IMessenger messenger) : base(messenger) 
    {
        // load com ports initially
        this.ReloadComPorts();
        this.portName = this.ComPorts.FirstOrDefault(string.Empty);
    }

    public bool AreValid()
    {
        if (String.IsNullOrEmpty(this.PortName))
        {
            this.messenger.Send<IUserInterfaceMessage>(new ProtocolSettingsInvalidMessage(nameof(this.PortName), "Null or empty"));
            return false;
        }
        if (this.PortName.ToLower().StartsWith("com") == false) 
        {
            this.messenger.Send<IUserInterfaceMessage>(new ProtocolSettingsInvalidMessage(nameof(this.PortName), "Must start with COM"));
            return false;
        }
        if ((this.DataBits < 5 || this.DataBits > 8) && this.DataBits != 16)
        {
            this.messenger.Send<IUserInterfaceMessage>(new ProtocolSettingsInvalidMessage(nameof(this.DataBits), "Must be 5...8 or 16"));
            return false;
        }
        if(this.BaudRate < 0)
        {
            this.messenger.Send<IUserInterfaceMessage>(new ProtocolSettingsInvalidMessage(nameof(this.BaudRate), "Must be larger than 0"));
            return false;
        }

        return true;
    }
}