using Microsoft.Extensions.Options;
using Slim.Resolvers;

namespace System.Configuration;

public sealed class OptionsResolver : IDependencyResolver
{
    private static readonly Type optionsType = typeof(OptionsWrapper<>);
    private static readonly Type configurationType = typeof(IOptionsManager);

    public bool CanResolve(Type type)
    {
        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IOptions<>))
        {
            return true;
        }

        return false;
    }

    public object Resolve(Slim.IServiceProvider serviceProvider, Type type)
    {
        var typedOptionsType = optionsType.MakeGenericType(type.GetGenericArguments());
        var configurationManager = serviceProvider.GetService<IOptionsManager>();
        var optionsValue = configurationType
            .GetMethod(nameof(IOptionsManager.GetOptions))
            .MakeGenericMethod(type.GetGenericArguments())
            .Invoke(configurationManager, Array.Empty<object>());

        return Activator.CreateInstance(typedOptionsType, optionsValue);
    }
}