package at.asitplus.eidas.specific.core.controller;

import java.io.IOException;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import at.gv.egiz.eaaf.core.api.data.EaafConstants;
import at.gv.egiz.eaaf.core.api.idp.auth.services.IProtocolAuthenticationService;
import at.gv.egiz.eaaf.core.exceptions.EaafException;
import at.gv.egiz.eaaf.core.impl.idp.controller.AbstractController;
import lombok.extern.slf4j.Slf4j;

/**
 * Default error handler for any request that is not part of MS-eIDAS-Node.
 *
 * @author tlenz
 *
 */
@Slf4j
@Controller
public class DefaultErrorController extends AbstractController implements ErrorController {

  private static final String INTERNAL_97 = "internal.97";
  private static final String INTERNAL_96 = "internal.96";
  
  @Autowired(required = true)
  protected IProtocolAuthenticationService protAuthService;

  /**
   * generic error-handler for any error that is not handled otherwise.
   *
   * @param req  Current HTTP request
   * @param resp Current HTTP response
   * @throws IOException In case of an internal error
   */
  @RequestMapping(EaafConstants.ENDPOINT_PREFIX_PUBLIC + "/error")
  public void handleGenericErrors(final HttpServletRequest req, final HttpServletResponse resp)
      throws IOException {
    final Object status = req.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);

    if (status != null) {
      final Integer statusCode = Integer.valueOf(status.toString());
      if (statusCode == HttpStatus.NOT_FOUND.value()) {
        forwardToCentralErrorHandling(new EaafException(INTERNAL_97), req, resp);
        return;
        
      }
    }      
      
    forwardToCentralErrorHandling(new EaafException(INTERNAL_96), req, resp);
         
  }

  private void forwardToCentralErrorHandling(Throwable e, HttpServletRequest req, HttpServletResponse resp)
      throws IOException {
    try {
      protAuthService.handleErrorNoRedirect(e, req, resp, false);

    } catch (final EaafException e1) {
      log.warn("ErrorHandling failed with error: ", e.getMessage(), e);
      log.warn("Can NOT handle an 'EAAFException'. Forwarding to generic error ... ", e);
      ioExceptionHandler(resp, e);

    }
  }

}