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package com.gitee.starblues.utils;

import org.springframework.util.ReflectionUtils;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 * 类工具类
 * @author starBlues
 * @version 2.4.0
 */
public class ClassUtils {

    private ClassUtils(){

    }

    public static List getAllFields(Class clazz) {
        List fieldList = new ArrayList<>();
        while (clazz != null){
            fieldList.addAll(new ArrayList<>(Arrays.asList(clazz.getDeclaredFields())));
            clazz = clazz.getSuperclass();
        }
        return fieldList;
    }

    /**
     * 通过反射获取字段
     * @param o 对象
     * @param fieldName 字段名称
     * @param  字段类型
     * @return 字段值
     * @throws IllegalAccessException 异常信息
     */
    public static  T getReflectionField(Object o, String fieldName) throws IllegalAccessException {
        if(o == null){
            return null;
        }

        Field templateResolversField = ReflectionUtils.findField(o.getClass(),
                fieldName);
        return getReflectionField(templateResolversField, o);
    }

    /**
     * 通过反射获取字段
     * @param o 对象
     * @param fieldName 字段名称
     * @param fieldClassType 字段类型
     * @param  字段类型
     * @return 字段值
     * @throws IllegalAccessException 异常信息
     */
    public static  T getReflectionField(Object o, String fieldName, Class fieldClassType) throws IllegalAccessException {
        if(o == null){
            return null;
        }
        Field templateResolversField = ReflectionUtils.findField(o.getClass(),
                fieldName, fieldClassType);
        return getReflectionField(templateResolversField, o);
    }

    /**
     * 通过反射Field获取字段
     * @param field Field字段
     * @param o 当前对象
     * @param  字段类型
     * @return 字段值
     * @throws IllegalAccessException 异常信息
     */
    public static  T getReflectionField(Field field, Object o) throws IllegalAccessException {
        if (field == null) {
            return null;
        }
        if(!field.isAccessible()){
            field.setAccessible(true);
        }
        Object fieldObject = field.get(o);
        return (T) fieldObject;
    }

    /**
     * 得到注解修改者
     * @param annotation 注解
     * @return 修改者集合
     * @throws Exception 异常
     */
    public static Map getAnnotationsUpdater(Object annotation) throws Exception {
        InvocationHandler invocationHandler = Proxy.getInvocationHandler(annotation);
        Field field = invocationHandler.getClass().getDeclaredField("memberValues");
        field.setAccessible(true);
        return (Map) field.get(invocationHandler);
    }

}