using back.Options;

namespace back.ServicesExtensions;

public static partial class ServicesExtensions
{
    private static IConfiguration ConfigureOptions(this IServiceCollection services)
    {
        IConfiguration config = services.BuildServiceProvider().GetRequiredService<IConfiguration>();
        string? baseDirectory = null;

        services.Configure<Databases>(config.GetSection(nameof(Databases)));
        services.Configure<DatabaseConfig>(DatabaseConfig.DataStorage, config.GetSection(DatabaseConfig.DataStorage));
        services.Configure<DatabaseConfig>(DatabaseConfig.BlobStorage, config.GetSection(DatabaseConfig.BlobStorage));

        services.PostConfigure<Databases>(databases =>
        {
            if (databases.BaseDirectory != null && !Directory.Exists(databases.BaseDirectory))
            {
                try
                {
                    Directory.CreateDirectory(databases.BaseDirectory);
                    Console.WriteLine($"Base directory created at: {databases.BaseDirectory}");
                    baseDirectory = databases.BaseDirectory;
                }
                catch (Exception ex)
                {
                    throw new InvalidOperationException(
                        $"Failed to create base directory at {databases.BaseDirectory}. " +
                        "Please ensure the path is valid and accessible.", ex
                    );
                }
            }
        });

        services.PostConfigure<DatabaseConfig>(DatabaseConfig.DataStorage, config =>
        {
            PostConfigureDatabaseConfig(config, baseDirectory);
        });

        services.PostConfigure<DatabaseConfig>(DatabaseConfig.BlobStorage, config =>
        {
            PostConfigureDatabaseConfig(config, baseDirectory);
        });

        return config;
    }

    private static void PostConfigureDatabaseConfig(DatabaseConfig config, string? baseDirectory)
    {
        if (!string.IsNullOrEmpty(config.SystemContainer))
        {
            var path = config.SystemContainer;
            if (!string.IsNullOrEmpty(baseDirectory))
            {
                path = Path.Combine(baseDirectory, path);
            }
            try
            {
                Directory.CreateDirectory(path);
                Console.WriteLine($"System container for {config.Provider} created at: {path}");
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException(
                    $"Failed to create system container at {path}. " +
                    "Please ensure the path is valid and accessible.", ex
                );
            }
        }
    }
}