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package wechat.common.util;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.thoughtworks.xstream.annotations.XStreamAlias;

import wechat.common.annotation.Required;
import wechat.common.bean.result.WxError;
import wechat.common.exception.WxErrorException;

/**
 *  * bean操作的一些工具类
 * 
 */
public class BeanUtils {
  private static Logger log = LoggerFactory.getLogger(BeanUtils.class);

  /**
   * 检查bean里标记为@Required的field是否为空，为空则抛异常
   *
   * @param bean 要检查的bean对象
   * @throws WxErrorException
   */
  public static void checkRequiredFields(Object bean) throws WxErrorException {
    List requiredFields = Lists.newArrayList();

    List fields = new ArrayList<>(Arrays.asList(bean.getClass().getDeclaredFields()));
    fields.addAll(Arrays.asList(bean.getClass().getSuperclass().getDeclaredFields()));
    for (Field field : fields) {
      try {
        boolean isAccessible = field.isAccessible();
        field.setAccessible(true);
        if (field.isAnnotationPresent(Required.class)) {
          if (field.get(bean) == null || (field.get(bean) instanceof String && StringUtils.isBlank(field.get(bean).toString()))) {
            //两种情况，一种是值为null，另外一种情况是类型为字符串，但是字符串内容为空的，都认为是没有提供值
            requiredFields.add(field.getName());
          }
        }
        field.setAccessible(isAccessible);
      } catch (SecurityException | IllegalArgumentException
        | IllegalAccessException e) {
        e.printStackTrace();
      }
    }

    if (!requiredFields.isEmpty()) {
      String msg = "必填字段 " + requiredFields + " 必须提供值";
      log.debug(msg);
      throw new WxErrorException(WxError.newBuilder().setErrorMsg(msg).build());
    }
  }

  /**
   * 将bean按照@XStreamAlias标识的字符串内容生成以之为key的map对象
   *
   * @param bean 包含@XStreamAlias的xml bean对象
   * @return map对象
   */
  public static Map xmlBean2Map(Object bean) {
    Map result = Maps.newHashMap();
    List fields = new ArrayList<>(Arrays.asList(bean.getClass().getDeclaredFields()));
    fields.addAll(Arrays.asList(bean.getClass().getSuperclass().getDeclaredFields()));
    for (Field field : fields) {
      try {
        boolean isAccessible = field.isAccessible();
        field.setAccessible(true);
        if (field.get(bean) == null) {
          field.setAccessible(isAccessible);
          continue;
        }

        if (field.isAnnotationPresent(XStreamAlias.class)) {
          result.put(field.getAnnotation(XStreamAlias.class).value(), field.get(bean).toString());
        }

        field.setAccessible(isAccessible);
      } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
        e.printStackTrace();
      }

    }

    return result;
  }
}