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package com.naharoo.commons.mstoolkit.rest.exceptionhandler.client;

import feign.Request;
import feign.Response;
import feign.codec.ErrorDecoder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.stereotype.Component;

@Component
@ConditionalOnClass(name = "feign.codec.ErrorDecoder")
public class FeignErrorDecoder implements ErrorDecoder {

  @Autowired
  private MsExceptionFactory msExceptionFactory;

  @Override
  public Exception decode(String methodKey, Response response) {
    final Request request = response.request();

    final int status = response.status();
    if (status < 400) {
      throw new IllegalStateException(
              "Only errors can be handled by " + FeignErrorDecoder.class.getSimpleName());
    }

    if (status >= 500) {
      return new IllegalStateException(
              String.format(
                      "Failed to process HTTP %s %s request. %s resource returned %s",
                      request.httpMethod().name(), request.url(), methodKey, status
              ));
    }

    final Response.Body body = response.body();
    return msExceptionFactory.createInstance(status, body == null ? null : body::asInputStream);
  }
}