using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using TheLivingWorld.Osm.Import;
using TheLivingWorld.Osm.Overpass;

namespace TheLivingWorld.Osm;

public static class OsmServiceCollectionExtensions
{
    /// <summary>
    /// Registers the OpenStreetMap import pipeline. The returned builder is the Overpass HTTP client, which
    /// callers usually need to adjust: Overpass queries run for minutes and do not fit default HTTP policies.
    /// </summary>
    public static IHttpClientBuilder AddOsmImport(this IServiceCollection services, IConfiguration configuration)
    {
        services.AddOptions<OsmOptions>()
            .Bind(configuration.GetSection(OsmOptions.SectionName));

        services.AddSingleton<OsmWorldBuilder>();
        services.AddSingleton<OsmWorldGenerator>();

        return services.AddHttpClient<OverpassClient>(OverpassClient.HttpClientName, static (provider, client) =>
        {
            var options = provider.GetRequiredService<Microsoft.Extensions.Options.IOptions<OsmOptions>>().Value;
            client.Timeout = TimeSpan.FromSeconds(options.RequestTimeoutSeconds);
            client.DefaultRequestHeaders.UserAgent.ParseAdd(options.UserAgent);
        });
    }
}