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package com.cntool.core.method;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;

/**
 * @program: practice
 * @description: 使用指定属性名的get、set方法
 * @author: ID-Tang
 * @create: 2022-04-14 10:45
 * @copyright: Copyright (c) [2022] [ID-tang]
 * [cntool] is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 * http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 **/
public class UseMethods {
    /**
     * 反射获取get方法
     *
     * @param ob   对象
     * @param name 字段名
     * @return 该字段名的值
     */
    public static Object getGetMethod(Object ob, String name) {
        Method[] m = ob.getClass().getMethods();
        for (Method method : m) {
            if (("get" + name).toLowerCase().equals(method.getName().toLowerCase())) {
                try {
                    return method.invoke(ob);
                } catch (IllegalAccessException | InvocationTargetException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

    /**
     * 根据属性，拿到set方法，并把值set到对象中
     *
     * @param obj       对象
     * @param clazz     对象的class
     * @param filedName 需要设置值得属性
     * @param typeClass 属性对应的类型
     * @param value     需要设置的值
     */
    public static void setValue(Object obj, Class clazz, String filedName, Class typeClass, Object value) {
        String methodName = "set" + filedName.substring(0, 1).toUpperCase() + filedName.substring(1);
        try {
            Method method = clazz.getDeclaredMethod(methodName, typeClass);
            method.invoke(obj, getClassTypeValue(typeClass, value));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }


    /**
     * 通过class类型获取获取对应类型的值
     *
     * @param typeClass class类型
     * @param value     值
     * @return Object
     */
    private static Object getClassTypeValue(Class typeClass, Object value) {
        if (typeClass == int.class || value instanceof Integer) {
            if (null == value) {
                return 0;
            }
            return value;
        } else if (typeClass == short.class) {
            if (null == value) {
                return 0;
            }
            return value;
        } else if (typeClass == byte.class) {
            if (null == value) {
                return 0;
            }
            return value;
        } else if (typeClass == double.class) {
            if (null == value) {
                return 0;
            }
            return value;
        } else if (typeClass == long.class) {
            if (null == value) {
                return 0;
            }
            return value;
        } else if (typeClass == String.class) {
            if (null == value) {
                return "";
            }
            return value;
        } else if (typeClass == boolean.class) {
            if (null == value) {
                return true;
            }
            return value;
        } else if (typeClass == BigDecimal.class) {
            if (null == value) {
                return new BigDecimal(0);
            }
            return new BigDecimal(value + "");
        } else {
            return typeClass.cast(value);
        }
    }
}