namespace Diligent.WebAPI.Host.Options
{
    public class SwaggerConfigureOptions : IConfigureOptions<SwaggerGenOptions>
    {
        private readonly IApiVersionDescriptionProvider _provider;

        public SwaggerConfigureOptions(IApiVersionDescriptionProvider provider) => _provider = provider;

        public void Configure(SwaggerGenOptions options)
        {
            // add swagger document for every API version discovered
            foreach (var description in _provider.ApiVersionDescriptions)
            {
                options.SwaggerDoc(
                    description.GroupName,
                    CreateVersionInfo(description));
            }
        }

        public void Configure(string name, SwaggerGenOptions options)
        {
            Configure(options);
        }

        private OpenApiInfo CreateVersionInfo(
                ApiVersionDescription description)
        {
            var info = new OpenApiInfo()
            {
                Title = "Diligent Web API",
                Version = description.ApiVersion.ToString()
            };

            if (description.IsDeprecated)
            {
                info.Description += " This API version has been deprecated.";
            }

            return info;
        }

    }
}