using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using WorkFlow.Application.Mapping;

namespace WorkFlow.Application;

public static class DependencyInjection
{
    public static IServiceCollection AddWorkFlowServices(this IServiceCollection services, Action<WorkFlowServiceOptions>? options = null)
    {
        WorkFlowServiceOptions sOptions = new(services);
        options?.Invoke(sOptions);

        services.AddAutoMapper(typeof(MappingProfile).Assembly);
        services.AddMediatR(cfg =>
        {
            cfg.RegisterServicesFromAssembly(typeof(DependencyInjection).Assembly);
            cfg.LicenseKey = sOptions.MediatRLicense;
        });

        if(!sOptions.IsMappingConfigured)
            services.Configure<MappingOptions>(_ => { });

        services.AddTransient<TfFileUriResolver>();
        services.AddTransient<TfFileIconUriResolver>();

        return services;
    }

    public class WorkFlowServiceOptions
    {
        private readonly IServiceCollection _services;

        internal bool IsMappingConfigured { get; private set; } = false;

        public WorkFlowServiceOptions(IServiceCollection services) => _services = services;
    
        private void EnsureSingleMappingConfiguration(Action action)
        {
            if (IsMappingConfigured)
                throw new InvalidOperationException("Mapping configuration has already been set.");
            action();
            IsMappingConfigured = true;
        }

        public void ConfigMapping(IConfiguration config) => EnsureSingleMappingConfiguration(() => _services.Configure<MappingOptions>(config));

        public void ConfigMapping(Action<MappingOptions> options) => EnsureSingleMappingConfiguration(() => _services.Configure(options));

        public string? MediatRLicense { get; set; }
    }
}