using Microsoft.Extensions.DependencyInjection;
using MultiTerm.Protocols.Factories;
using MultiTerm.Protocols.Serial;
using MultiTerm.Protocols.Udp;
using MultiTerm.Protocols.UsbHid;

namespace MultiTerm.Protocols.Helpers;

public static class ServiceExtensions
{
    /// <summary>
    /// Service Extension to add all implementations of <see cref="ICommunicationProtocol"/> to Dependency Injection.
    /// Also adds <see cref="CommunicationProtocolFactory"/> to Dependency injection, which allows instanciation of <see cref="ICommunicationProtocol"/> 
    /// and <see cref="IProtocolSettingsViewModel"/> during runtime.
    /// </summary>
    /// <param name="services">existing services collection</param>
    public static void AddCommunicationProtocolFactory(this IServiceCollection services)
    {
        // add all protocol implementations to the services collection
        services.AddTransient<ICommunicationProtocol, SerialProtocol>();
        services.AddTransient<ICommunicationProtocol, UsbHidProtocol>();
        services.AddTransient<ICommunicationProtocol, UdpProtocol>();
        // TODO extend

        // add all settings view model implementations to the services collection
        services.AddTransient<IProtocolSettingsViewModel, SerialProtocolSettingsViewModel>();
        services.AddTransient<IProtocolSettingsViewModel, UsbHidProtocolSettingsViewModel>();
        services.AddTransient<IProtocolSettingsViewModel, UdpProtocolSettingsViewModel>();
        // TODO extend

        // add a function to the services collection, which is used by the CommunicationProtocolFactory
        // to get a list of all registered implementations of ICommunicationProtocol
        services.AddSingleton<Func<IEnumerable<ICommunicationProtocol>>>(x => () => x.GetService<IEnumerable<ICommunicationProtocol>>()!);
        // to get a list of all registered implementations of IProtocolSettingsViewModel
        services.AddSingleton<Func<IEnumerable<IProtocolSettingsViewModel>>>(x => () => x.GetService<IEnumerable<IProtocolSettingsViewModel>>()!);

        // add the factory itself to the services collection
        services.AddSingleton<ICommunicationProtocolFactory, CommunicationProtocolFactory>();
    }
}