knightcrawler/src/shared/Extensions/ConfigurationExtensions.cs

using Microsoft.Extensions.DependencyInjection.Extensions;

namespace SharedContracts.Extensions;

public static class ConfigurationExtensions
{
    private const string ConfigurationFolder = "Configuration";
    private const string LoggingConfig = "logging.json";

    public static IConfigurationBuilder AddServiceConfiguration(this IConfigurationBuilder builder)
    {
        builder.SetBasePath(Path.Combine(AppContext.BaseDirectory, ConfigurationFolder));

        builder.AddJsonFile(LoggingConfig, false, true);

        builder.AddEnvironmentVariables();

        return builder;
    }

    public static TConfiguration LoadConfigurationFromConfig<TConfiguration>(this IServiceCollection services, IConfiguration configuration, string sectionName)
        where TConfiguration : class
    {
        var instance = configuration.GetSection(sectionName).Get<TConfiguration>();

        ArgumentNullException.ThrowIfNull(instance, nameof(instance));

        services.TryAddSingleton(instance);

        return instance;
    }

    public static TConfiguration LoadConfigurationFromEnv<TConfiguration>(this IServiceCollection services)
        where TConfiguration : class
    {
        var instance = Activator.CreateInstance<TConfiguration>();

        ArgumentNullException.ThrowIfNull(instance, nameof(instance));

        services.TryAddSingleton(instance);

        return instance;
    }
}