using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;

namespace NeonSprawl.Server.Game.Skills;

/// <summary>DI registration for the fail-fast skill catalog (NEO-34).</summary>
public static class SkillCatalogServiceCollectionExtensions
{
    /// <summary>Binds <see cref="ContentPathsOptions"/> and registers <see cref="SkillDefinitionCatalog"/> and <see cref="ISkillDefinitionRegistry"/> as singletons.</summary>
    public static IServiceCollection AddSkillDefinitionCatalog(this IServiceCollection services, IConfiguration configuration)
    {
        services.AddOptions<ContentPathsOptions>()
            .Bind(configuration.GetSection(ContentPathsOptions.SectionName));

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

            var skillsDir = SkillCatalogPathResolution.ResolveSkillsDirectory(opts.SkillsDirectory, hostEnv.ContentRootPath);
            var schemaPath = SkillCatalogPathResolution.ResolveSkillDefSchemaPath(
                skillsDir,
                opts.SkillDefSchemaPath,
                hostEnv.ContentRootPath);

            return SkillDefinitionCatalogLoader.Load(skillsDir, schemaPath, logger);
        });

        services.AddSingleton<ISkillDefinitionRegistry>(sp =>
            new SkillDefinitionRegistry(sp.GetRequiredService<SkillDefinitionCatalog>()));

        return services;
    }
}
