package com.terra.system.helper;

import com.terra.common.helper.StringHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.lang.reflect.Method;

/**
 * 枚举帮助类
 * @author WWW
 */
public class EnumHelper {
    private static final String GETTER_PREFIX = "get";

    private static Log log = LogFactory.getLog(EnumHelper.class);

    /**
     * 根据名称获取枚举
     *
     * @param clazz 枚举类型
     * @param name  枚举的名称，如：SqlParamType中的AND
     * @return 返回枚举值
     */
    public static <T extends Enum<T>> T nameOf(Class<T> clazz, String name) {
        return Enum.valueOf(clazz, name);
    }

    /**
     * 根据属性名+值获取枚举
     *
     * @param clazz        枚举类型
     * @param propertyName 字段,如name,id
     * @param value        值,如张三
     * @return 返回枚举值
     */
    public static <T extends Enum<T>> T getByString(Class<T> clazz, String propertyName, String value) {
        String getterMethodName = GETTER_PREFIX + StringHelper.firstCharToUpperCase(propertyName);
        T result = null;
        try {
            T[] arr = clazz.getEnumConstants();
            Method targetMethod = clazz.getDeclaredMethod(getterMethodName);
            String typeCodeVal = null;
            for (T entity : arr) {
                typeCodeVal = targetMethod.invoke(entity).toString();
                if (typeCodeVal.contentEquals(value)) {
                    result = entity;
                    break;
                }
            }
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }

        return result;
    }

    /**
     * 根据整数获取枚举
     *
     * @param clazz        枚举类型
     * @param propertyName 字段,如 age
     * @param value        值,如18
     * @return 返回枚举值
     */
    public static <T extends Enum<T>> T getByInt(Class<T> clazz, String propertyName, int value) {
        String getterMethodName = GETTER_PREFIX + StringHelper.firstCharToUpperCase(propertyName);
        T result = null;
        try {
            T[] arr = clazz.getEnumConstants();
            Method targetMethod = clazz.getDeclaredMethod(getterMethodName);
            int typeCodeVal;
            for (T entity : arr) {
                typeCodeVal = Integer.parseInt(targetMethod.invoke(entity).toString());
                if (typeCodeVal == value) {
                    result = entity;
                    break;
                }
            }
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }
        return result;
    }
}