package com.xkrs.utils;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author XinYi Song
 */
public class ObjectToBeanUtils {

    public static Logger log = LoggerFactory.getLogger(ObjectToBeanUtils.class);

    /**
     * 把List<Object[]>转换成List<T>
     */
    public static <T> List<T> objectToBean(List<Object[]> objList, Class<T> clz) throws Exception{
        if (objList==null || objList.size()==0) {
            return null;
        }

        Class<?>[] cz = null;
        Constructor<?>[] cons = clz.getConstructors();
        for (Constructor<?> ct : cons) {
            Class<?>[] clazz = ct.getParameterTypes();
            if (objList.get(0).length == clazz.length) {
                cz = clazz;
                break;
            }
        }

        List<T> list = new ArrayList<T>();
        for (Object[] obj : objList) {
            Constructor<T> cr = clz.getConstructor(cz);
            list.add(cr.newInstance(obj));
        }
        return list;
    }






    public static <T> List<T> objectToBeans(List<Object[]> objList, Class<T> clz) throws Exception{
        if (objList==null || objList.size()==0) {
            return null;
        }

        int length = objList.get(0).length;
        log.info("*************>"+length);

        Class<?>[] cz = null;
        Constructor<?>[] cons = clz.getConstructors();
        for (Constructor<?> ct : cons) {
            Class<?>[] clazz = ct.getParameterTypes();
            if (objList.get(0).length == clazz.length) {
                cz = clazz;
                break;
            }
        }

        List<T> list = new ArrayList<T>();
        log.info("---------->"+objList.get(0));
            Constructor<T> cr = clz.getConstructor(cz);
        T newInstance = cr.newInstance((Object) objList.get(0));
        list.add(newInstance);
        return list;
    }


    public static <T> List<T> castEntity(List<Object[]> list, Class<T> clazz, Object model) {
        List<T> returnList = new ArrayList<T>();
        if (list.isEmpty()) {
            return returnList;
        }
        //获取每个数组集合的元素个数
        Object[] co = list.get(0);

        //获取当前实体类的属性名、属性值、属性类别
        List<Map> attributeInfoList = getFiledsInfo(model);
        //创建属性类别数组
        Class[] c2 = new Class[attributeInfoList.size()];
        //如果数组集合元素个数与实体类属性个数不一致则发生错误
        if (attributeInfoList.size() != co.length) {
            return returnList;
        }
        //确定构造方法
        for (int i = 0; i < attributeInfoList.size(); i++) {
            c2[i] = (Class) attributeInfoList.get(i).get("type");
        }
        try {
            for (Object[] o : list) {
                Constructor<T> constructor = clazz.getConstructor(c2);
                returnList.add(constructor.newInstance(o));
            }
        } catch (Exception ex) {
            log.info("实体数据转化为实体类发生异常：异常信息：{}", ex.getMessage());
            return returnList;
        }
        return returnList;
    }

    /**
     * 根据属性名获取属性值
     *
     * @param fieldName 属性名
     * @param modle     实体类
     * @return 属性值
     */
    private static Object getFieldValueByName(String fieldName, Object modle) {
        try {
            String firstLetter = fieldName.substring(0, 1).toUpperCase();
            String getter = "get" + firstLetter + fieldName.substring(1);
            Method method = modle.getClass().getMethod(getter, new Class[]{});
            Object value = method.invoke(modle, new Object[]{});
            return value;
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取属性类型(type)，属性名(name)，属性值(value)的map组成的list
     *
     * @param model 实体类
     * @return list集合
     */
    private static List<Map> getFiledsInfo(Object model) {
        Field[] fields = model.getClass().getDeclaredFields();
        List<Map> list = new ArrayList(fields.length);
        Map infoMap = null;
        for (int i = 0; i < fields.length; i++) {
            infoMap = new HashMap(3);
            infoMap.put("type", fields[i].getType());
            infoMap.put("name", fields[i].getName());
            infoMap.put("value", getFieldValueByName(fields[i].getName(), model));
            list.add(infoMap);
        }
        return list;
    }


}