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package com.xiongyingqi.common.platform.spring.exception;

import com.xiongyingqi.common.platform.entity.ReturnResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 异常统一处理类，根据前端请求的需要，返回XML|JSON|或者网页格式
 *
 * @author xiongyingqi
 */
public class InterfaceExceptionHandler extends AbstractHandlerExceptionResolver {

  private static final Logger logger = LoggerFactory
      .getLogger(InterfaceExceptionHandler.class);

  private static final String ACCEPT = "Accept";

  //异常jsp页面
  private static final String EXCEPTION_JSP_PATH = "exception";

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver#
   * doResolveException(javax.servlet.http.HttpServletRequest,
   * javax.servlet.http.HttpServletResponse, java.lang.Object,
   * java.lang.Exception)
   */
  @Override
  protected ModelAndView doResolveException(HttpServletRequest request,
                                            HttpServletResponse response, Object handler,
                                            Exception ex) {
    response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
    //根据accept返回需要的数据格式
    String accept = request.getHeader(ACCEPT);
    ReturnResult result = ReturnResult.SYSTEM_ERROR;
    if (logger.isDebugEnabled()) {
      logger.debug("get Accept:{}", accept);
    }
    logger.error("Exception occurs from " + handler, ex);
    if (MediaType.TEXT_HTML_VALUE.equals(accept)
        || MediaType.APPLICATION_XHTML_XML_VALUE.equals(accept)) { //html
      ModelAndView modelAndView = new ModelAndView(EXCEPTION_JSP_PATH);
      return modelAndView;
    }

    ModelAndView modelAndView = new ModelAndView();
    if (MediaType.APPLICATION_JSON_VALUE.equals(accept)) {//JSON
      modelAndView.setView(new MappingJackson2JsonView());
    } else {
      // 默认返回XML
      modelAndView.setView(new MappingJackson2JsonView());
    }
    modelAndView.addObject(result);
    return modelAndView;
  }

}