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package com.github.edgarespina.mwa.handler;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;

/**
 * Convert {@link BindingResult} using the {@link HttpMessageConverter} service.
 *
 * @author edgar.espina
 * @since 0.1
 */
public class BindHandlerExceptionResolver extends
    MessageConverterHandlerExceptionResolver {

  /**
   * Creates a new {@link BindHandlerExceptionResolver}.
   *
   * @param exceptionClass The exception class. Required.
   */
  public BindHandlerExceptionResolver(
      final Class exceptionClass) {
    super(exceptionClass);
  }

  /**
   * Creates a new {@link BindHandlerExceptionResolver}.
   */
  public BindHandlerExceptionResolver() {
    super(BindException.class);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected Object convert(final Exception exception) {
    return convert(((BindException) exception).getBindingResult());
  }

  /**
   * Use a custom format for {@link BindingResult}.
   * 
   * field: The field's name. Optional.
   * 
rejectedValue: The rejected value. Optional.
   * 
message: The error message.
   * 
type: The error type.
   * 
source: The root/contianer object.
   * 
   * {@inheritDoc}
   */
  protected Object convert(final BindingResult bindingResult) {
    List bindingErrors = bindingResult.getAllErrors();
    List