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package lambdify.apigateway;

import static lombok.AccessLevel.PRIVATE;
import java.util.*;

import lambdify.aws.events.apigateway.*;
import lombok.*;
import lombok.experimental.Accessors;

/**
 *
 */
@ToString
@Getter @Setter @Accessors(fluent = true)
public class ApiGatewayConfig {

	public static final ApiGatewayConfig INSTANCE = new ApiGatewayConfig();

	/**
	 * The default value that would be used when a response is produced
	 * and no "Content-Type" was defined.
	 */
	@NonNull String defaultContentType = "text/plain";

	/**
	 * The default {@link LambdaRouter.Function} to be invoked when the router was not
	 * able to find a route that matches the current request.
	 */
	@NonNull
	LambdaRouter.Function defaultNotFoundHandler = new DefaultNotFoundHandler();

	/**
	 * The parameter reader responsible to convert String into specific objects.
	 */
	@NonNull ParamReader paramReader = new ParamReader();

	/**
	 * The request serializers. By default it loads all {@code Serializer}s found at the class path.
	 */
	@NonNull Map serializers = new HashMap<>();

	private ApiGatewayConfig(){
		val found = ServiceLoader.load( Serializer.class );
		for ( val serializer : found ) {
			registerSerializer( serializer );
			if ( serializer.isCandidateToBeDefaultSerializer() )
			    defaultContentType = serializer.contentType();
		}
	}

	public ApiGatewayConfig registerSerializer( Serializer serializer ) {
		val previous = serializers().put( serializer.contentType(), serializer );
		if ( previous != null )
			System.err.println( "Overriding previously registered serializer for " + serializer.contentType() );
		System.err.println("Registered API Gateway Input/Output Serializer for '"
			+ serializer.contentType() + "': " + serializer.getClass().getCanonicalName() );
		return this;
	}

	/**
	 * The default handler for cases where the request wasn't mapped and
	 * have no predefined response for it.
	 */
	class DefaultNotFoundHandler implements LambdaRouter.Function {

		@Override
		public ProxyResponseEvent handleRequest(ProxyRequestEvent input) {
			return Responses.notFound();
		}
	}
}