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package com.garmin.util;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

public class ObjectUtils {
//    public static void main(String[] args) {
//        UserInfo userInfo =new UserInfo();
//        userInfo.setUserId("111");
//        userInfo.setSid("a");
//        userInfo.setUserAccessToken("1213123");
//        userInfo.setUserAccessSecret("13123");
////        T t = new T();
////        t.setS("11");
//        System.out.println(mapToString(userInfo,true));
//    }
    public static String mapToString(Map map){
        StringBuilder stringBuilder =new StringBuilder();
        return getString(map, stringBuilder);
    }

    private static String getString(Map map, StringBuilder stringBuilder) {
        if(map==null || map.isEmpty()){
            return null;
        }
        stringBuilder.append("?");
        int i=0;
        for(String key:map.keySet()){
            stringBuilder.append(key).append("=").append(map.get(key));
            i++;
            if(i!=map.size()){
                stringBuilder.append("&");
            }
        }
        return stringBuilder.toString();
    }

    public static String mapToString(Object obj,boolean isDecode){
        StringBuilder stringBuilder =new StringBuilder();
        Map map=converMap(obj,isDecode);
        return getString(map, stringBuilder);
    }


    public static Map converMap(Object obj)  {
        return converMap(obj,false);
    }
    public static Map converMap(Object obj,boolean isDecode)  {
        Map map = new HashMap<>();
        if(obj==null){
            return null;
        }
        Field[] fields = obj.getClass().getDeclaredFields();//获取类的各个属性值
        for(Field field : fields){
            String fieldName =  field.getName();//获取类的属性名称
            if(getValueByFieldName(fieldName,obj)!=null) {//获取类的属性名称对应的值
                Object value = getValueByFieldName(fieldName, obj);
                if(isDecode){
                    try {
                        value=URLEncoder.encode(value+"","UTF-8");
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                    map.put(fieldName,value );
                }else{
                    map.put(fieldName,value);
                }
            }
        }
        return map;
    }
    /**
     * 根据属性名获取该类此属性的值
     * @param fieldName
     * @param object
     * @return
     */
    public static Object getValueByFieldName(String fieldName,Object object){
        String firstLetter=fieldName.substring(0,1).toUpperCase();
        String getter = "get"+firstLetter+fieldName.substring(1);
        try {
            Method method = object.getClass().getMethod(getter);
            return method.invoke(object);
        } catch (Exception e) {
            return null;
        }
    }
}