using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;
using NeonSprawl.Server.Game.Skills;

namespace NeonSprawl.Server.Game.Factions;

/// <summary>DI registration for the fail-fast faction catalog (NEO-134).</summary>
public static class FactionCatalogServiceCollectionExtensions
{
    /// <summary>Binds <see cref="ContentPathsOptions"/> and registers <see cref="FactionDefinitionCatalog"/> and <see cref="IFactionDefinitionRegistry"/> as singletons.</summary>
    public static IServiceCollection AddFactionDefinitionCatalog(this IServiceCollection services, IConfiguration configuration)
    {
        services.AddOptions<ContentPathsOptions>()
            .Bind(configuration.GetSection(ContentPathsOptions.SectionName));

        services.AddSingleton<FactionDefinitionCatalog>(sp =>
        {
            var hostEnv = sp.GetRequiredService<IHostEnvironment>();
            var opts = sp.GetRequiredService<IOptions<ContentPathsOptions>>().Value;
            var logger = sp.GetRequiredService<ILoggerFactory>()
                .CreateLogger("NeonSprawl.Server.Game.Factions.FactionCatalog");

            var factionsDir = FactionCatalogPathResolution.ResolveFactionsDirectory(
                opts.FactionsDirectory,
                hostEnv.ContentRootPath);
            var schemaPath = FactionCatalogPathResolution.ResolveFactionDefSchemaPath(
                factionsDir,
                opts.FactionDefSchemaPath,
                hostEnv.ContentRootPath);

            return FactionDefinitionCatalogLoader.Load(factionsDir, schemaPath, logger);
        });

        services.AddSingleton<IFactionDefinitionRegistry>(sp =>
            new FactionDefinitionRegistry(sp.GetRequiredService<FactionDefinitionCatalog>()));

        return services;
    }
}