using System.Reflection;

namespace WebTemplate.ServerAspects.Swagger;

public class SwaggerModule : IAppConfigurationModule
{
	public void ConfigureServices(IServiceCollection services, IConfigurationRoot config)
	{
		// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
		services.AddEndpointsApiExplorer();
		services.AddSwaggerGen(swaggerGen =>
		{
			swaggerGen.SupportNonNullableReferenceTypes();
			swaggerGen.EnableAnnotations();
			// The StringEnumSchemaFilter changes the representation of enums from numbers to strings in
			// the OpenApi document. This assumes that the JSON serializer has ben configured to use the
			// JsonStringEnumConverter - the two play hand-in-hand.
			swaggerGen.SchemaFilter<StringEnumSchemaFilter>();
			
			// This requires the <GenerateDocumentationFile> property to be set to true in the
			// .csrpoj file
			var xmlFilename = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
			var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFilename);
			if (File.Exists(xmlPath))
			{
				swaggerGen.IncludeXmlComments(xmlPath);
			}
		});
	}

	public void ConfigureApplication(WebApplication app)
	{
		// OpenApi documents and the Swagger UI should generally not be exposed in production environments based
		// on the assumption that production environments are _publicly_ accessible. That is not always the case
		// and for somewhat protected scenarios, exposing the API documentation can be very helpful which is why
		// we are not using the default "IsDevelopment" check, but instead provide an environment variable that
		// can be used to disable Swagger when necessary. Undocumented APIs are just not that useful.
		//if (app.Environment.IsDevelopment())
		if (Environment.GetEnvironmentVariable("SVC_DISALBE_SWAGGER") != "1")
		{
			app.UseSwagger();
			app.UseSwaggerUI();
		}
	}
}