EnvelopeGenerator/EnvelopeGenerator.DependencyInjection/DependencyInjection.cs

using DigitalData.EmailProfilerDispatcher;
using DigitalData.UserManager.DependencyInjection;
using EnvelopeGenerator.Application;
using EnvelopeGenerator.Infrastructure;
using Microsoft.Extensions.Caching.SqlServer;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using static EnvelopeGenerator.Infrastructure.DependencyInjection;

namespace EnvelopeGenerator.DependencyInjection;

public static class DependencyInjection
{
    public static IServiceCollection AddEnvelopeGenerator(this IServiceCollection services, Action<EGConfiguration> options)
    {
        var egConfig = new EGConfiguration();
        options.Invoke(egConfig);
        egConfig.EnsureAllServicesConfigured();
        egConfig.RegisterAll(services);

        // Add envelope generator services
#pragma warning disable CS0618
        services.AddUserManager<EGDbContext>();
#pragma warning restore CS0618

        services.AddDispatcher<EGDbContext>();

        return services;
    }

    public record EGConfiguration
    {
        internal readonly Queue<Action<IServiceCollection>> _serviceRegs = new();

        internal void RegisterAll(IServiceCollection services)
        {
            while (_serviceRegs.Count > 0)
                _serviceRegs.Dequeue().Invoke(services);
        }

        // TODO: update to use attributes and reflections instead of _addingStatus-dictionary
        private readonly Dictionary<string, bool> _addingStatus = new ()
        {
            { nameof(AddLocalization), false },
            { nameof(AddDistributedSqlServerCache), false },
            { nameof(AddInfrastructure), false },
            { nameof(AddServices), false },
        };

        public EGConfiguration AddLocalization(Action<IServiceCollection>? customLocalizationOptions = null)
        {
            _serviceRegs.Enqueue(customLocalizationOptions ?? (s => s.AddLocalization()));
            _addingStatus[nameof(AddLocalization)] = true;
            return this;
        }

        public EGConfiguration AddDistributedSqlServerCache(Action<SqlServerCacheOptions> setupAction)
        {
            _serviceRegs.Enqueue(s => s.AddDistributedSqlServerCache(setupAction));
            _addingStatus[nameof(AddDistributedSqlServerCache)] = true;
            return this;
        }

        public EGConfiguration AddInfrastructure(Action<EGInfrastructureConfiguration> options)
        {
#pragma warning disable CS0618
            _serviceRegs.Enqueue(s => s.AddEGInfrastructureServices(options));
#pragma warning restore CS0618
            _addingStatus[nameof(AddInfrastructure)] = true;
            return this;
        }

        public EGConfiguration AddServices(IConfiguration config)
        {
#pragma warning disable CS0618
            _serviceRegs.Enqueue(s => s.AddEnvelopeGeneratorServices(config));
#pragma warning restore CS0618
            _addingStatus[nameof(AddServices)] = true;
            return this;
        }

        internal void EnsureAllServicesConfigured()
        {
            var missingServices = _addingStatus
                .Where(kv => !kv.Value)
                .Select(kv => kv.Key)
                .ToList();

            if (missingServices.Count > 0)
            {
                var missingList = string.Join(", ", missingServices);
                throw new InvalidOperationException(
                    $"Service configuration incomplete. The following required service methods were not called: {missingList}. " +
                    "Please ensure all necessary configuration methods are invoked before building the application.");
            }
        }
    }
}