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package com.baidu.disconf.client.support.utils;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Set;

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

import com.baidu.disconf.client.common.annotations.DisconfFileItem;
import com.baidu.disconf.client.common.annotations.DisconfItem;
import com.baidu.disconf.core.common.constants.DisConfigTypeEnum;

/**
 * @author liaoqiqi
 * @version 2014-9-9
 */
public class MethodUtils {

    protected static final Logger LOGGER = LoggerFactory.getLogger(MethodUtils.class);

    /**
     * 对于一个 get/is 方法，返回其相对应的Field
     */
    public static Field getFieldFromMethod(Method method, Field[] expectedFields, DisConfigTypeEnum disConfigTypeEnum) {

        String fieldName;

        if (disConfigTypeEnum.equals(DisConfigTypeEnum.FILE)) {

            DisconfFileItem disconfFileItem = method.getAnnotation(DisconfFileItem.class);
            // 根据用户设定的注解来获取
            fieldName = disconfFileItem.associateField();

        } else {

            DisconfItem disItem = method.getAnnotation(DisconfItem.class);
            // 根据用户设定的注解来获取
            fieldName = disItem.associateField();
        }

        //
        // 如果用户未设定注解，则猜其名字
        //
        if (StringUtils.isEmpty(fieldName)) {
            // 从方法名 获取其 Field 名
            fieldName = ClassUtils.getFieldNameByGetMethodName(method.getName());
        }

        // 确认此Field名是正确的
        for (Field field : expectedFields) {

            if (field.getName().equals(fieldName)) {
                return field;
            }
        }

        LOGGER.error(method.toString() + " cannot get its related field name. ");

        return null;
    }

    /**
     *
     */
    public static Method getSetterMethodFromField(Class curClass, Field field) {

        String fieldName = field.getName().toLowerCase();

        Set methods = ClassUtils.getAllMethod(curClass);
        for (Method method : methods) {
            if (method.getName().toLowerCase().equals("set" + fieldName)) {
                return method;
            }
        }

        return null;
    }

}