#include "jsondecoderloop.h"
#include <iostream>
#include <QJsonArray>
#include <QJsonObject>
#include <QJsonDocument>
#include <QStringList>
JsonDecoderLoop::JsonDecoderLoop()
{

}

QString JsonDecoderLoop::decode(const QByteArray byteArray, QString key)
{
    // Check input
    if ( byteArray.isEmpty() || 0 == key.compare(""))
    {
        return "";
    }
    QString str = "";
    QJsonParseError jsonError;
    QJsonDocument jsonDoc = QJsonDocument::fromJson(byteArray, &jsonError);
    if(jsonError.error == QJsonParseError::NoError)
    {
        if(jsonDoc.isObject())
        {
            QJsonObject obj = jsonDoc.object();
            // Loop get value according the key world
            str = getValueBykey(obj, key);
        }
    }
    return str;
}
QString JsonDecoderLoop::getValueBykey(QJsonObject obj, QString key)
{
    QString rst = "";
    QStringList strList = obj.keys();
     for (int i = 0; i < obj.size(); i++)
     {
         QJsonValue val = obj.value(strList.at(i));
         if ( strList.at(i) == key && val.isString())
         {
             rst = val.toString();
         }
         else if (val.isObject())
         {
             rst = getValueBykey(val.toObject(), key);
         }
     }
    return rst;
}