package com.kidgrow.zuul.fallback;


import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.kidgrow.common.model.ErrorCode;
import com.kidgrow.common.model.ResultBody;
import com.netflix.hystrix.exception.HystrixTimeoutException;
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;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

/**
 * 石家庄喜高科技有限责任公司 版权所有 © Copyright 2020<br>
 *
 * @Description: <br>
 * @Project: <br>
 * @CreateDate: Created in 2020/2/4 14:49 <br>
 * @Author: <a href="4345453@kidgrow.com">liuke</a>
 */
@Component
public class ServiceFallback implements FallbackProvider {
    @Override
    public String getRoute() {
        return "*";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        if (cause instanceof HystrixTimeoutException) {
            return response(HttpStatus.GATEWAY_TIMEOUT);
        } else {
            return this.fallbackResponse();
        }
    }


    public ClientHttpResponse fallbackResponse() {
        return this.response(HttpStatus.INTERNAL_SERVER_ERROR);
    }


    private ClientHttpResponse response(final HttpStatus status) {
        return new ClientHttpResponse() {

            @Override
            public HttpStatus getStatusCode() throws IOException {
                return status;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return status.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return status.getReasonPhrase();
            }

            @Override
            public void close() {
            }

            @Override
            public InputStream getBody() throws IOException {
                String content = JSONObject.toJSONString(ResultBody.failed().code(ErrorCode.SERVICE_UNAVAILABLE.getCode()).msg(ErrorCode.SERVICE_UNAVAILABLE.getMessage()), SerializerFeature.WriteMapNullValue);
                return new ByteArrayInputStream(content.getBytes());
            }

            @Override
            public HttpHeaders getHeaders() {
                // headers设定
                HttpHeaders headers = new HttpHeaders();
                MediaType mt = new MediaType("application", "json", Charset.forName("UTF-8"));
                headers.setContentType(mt);
                return headers;
            }
        };
    }
}