package com.sptg.gateway.fallback;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;
@Component
public class ZuulFallbackHandler implements FallbackProvider {
	private static final Logger log = LoggerFactory.getLogger(ZuulFallbackHandler.class);

	@Override
	public String getRoute() {
		return "*";
	}

	public ClientHttpResponse fallbackResponse(String route) {
		return new ClientHttpResponse() {
			@Override
			public HttpStatus getStatusCode() throws IOException {
				return HttpStatus.OK;
			}

			@Override
			public int getRawStatusCode() throws IOException {
				return 200;
			}

			@Override
			public String getStatusText() throws IOException {
				return "OK";
			}

			@Override
			public void close() {

			}

			@Override
			public InputStream getBody() throws IOException {
				return new ByteArrayInputStream((route + " is unavailable.").getBytes());
			}

			@Override
			public HttpHeaders getHeaders() {
				HttpHeaders headers = new HttpHeaders();
				headers.setContentType(MediaType.APPLICATION_JSON);
				return headers;
			}
		};
	}

	@Override
	public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
		if (cause != null) {
			String reason = cause.getMessage();
			log.warn("Excption {}", reason);
		}
		return fallbackResponse(route);
	}
}
