#nullable enable

using Microsoft.Extensions.DependencyInjection;
using Svrnty.CQRS.Abstractions;
using Svrnty.CQRS.Discovery;

namespace Svrnty.CQRS.Configuration;

/// <summary>
/// Builder for configuring CQRS services
/// </summary>
public class CqrsBuilder
{
    /// <summary>
    /// Gets the service collection for manual service registration
    /// </summary>
    public IServiceCollection Services { get; }

    /// <summary>
    /// Gets the CQRS configuration object (used by extension packages)
    /// </summary>
    public CqrsConfiguration Configuration { get; }

    internal CqrsBuilder(IServiceCollection services)
    {
        Services = services;
        Configuration = new CqrsConfiguration();

        // Add discovery services by default
        services.AddDefaultCommandDiscovery();
        services.AddDefaultQueryDiscovery();

        // Register configuration as singleton so it can be accessed later
        services.AddSingleton(Configuration);
    }

    /// <summary>
    /// Completes the builder configuration
    /// </summary>
    internal void Build()
    {
        // Configuration is now handled by extension methods in respective packages
    }

    /// <summary>
    /// Adds a command handler to the CQRS pipeline
    /// </summary>
    public CqrsBuilder AddCommand<TCommand, TCommandHandler>()
        where TCommand : class
        where TCommandHandler : class, ICommandHandler<TCommand>
    {
        Services.AddCommand<TCommand, TCommandHandler>();
        return this;
    }

    /// <summary>
    /// Adds a command handler with result to the CQRS pipeline
    /// </summary>
    public CqrsBuilder AddCommand<TCommand, TResult, TCommandHandler>()
        where TCommand : class
        where TCommandHandler : class, ICommandHandler<TCommand, TResult>
    {
        Services.AddCommand<TCommand, TResult, TCommandHandler>();
        return this;
    }

    /// <summary>
    /// Adds a query handler to the CQRS pipeline
    /// </summary>
    public CqrsBuilder AddQuery<TQuery, TResult, TQueryHandler>()
        where TQuery : class
        where TQueryHandler : class, IQueryHandler<TQuery, TResult>
    {
        Services.AddQuery<TQuery, TResult, TQueryHandler>();
        return this;
    }
}