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

import com.google.common.base.Optional;
import com.xiongyingqi.common.platform.entity.ReturnResult;
import com.xiongyingqi.common.platform.util.BindingResultUtils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.validation.BindingResult;

/**
 * @author xiongyingqi
 * @since 16-12-15 下午9:13
 */
@Aspect
@Component
@Order(0)
public class BindingResultAspect {
  private static final Logger logger = LoggerFactory.getLogger(BindingResultAspect.class);

  @Pointcut("execution(public com.xiongyingqi.common.platform.entity.ReturnResult+ (*..*)" +
      ".*(.., @javax.validation.Valid (*),org.springframework.validation.BindingResult, ..))")
  public void validMethods() {
  }

  @Around("validMethods()")
  public Object aop(ProceedingJoinPoint pjp) throws Throwable {
    Object[] args = pjp.getArgs();
    for (Object arg : args) {
      Optional returnResultOptional = buildResultIfHasErrors(arg);
      if (returnResultOptional.isPresent()) {
        if (logger.isDebugEnabled()) {
          logger.debug("Intercept binding result, and returns: {}", returnResultOptional.get());
        }
        return returnResultOptional.get();
      }
    }
    return pjp.proceed();
  }

  private Optional buildResultIfHasErrors(Object arg) {
    if (!(arg instanceof BindingResult)) {
      return Optional.absent();
    }
    BindingResult bindingResult = (BindingResult) arg;
    if (!bindingResult.hasErrors()) {
      return Optional.absent();
    }
    ReturnResult returnResult = BindingResultUtils.buildResult(bindingResult);
    if (returnResult == null) {
      return Optional.absent();
    }
    return Optional.of(returnResult);
  }


}