#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <memory>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    mpSocket = new QUdpSocket(this);
    mpSocketListen = new QUdpSocket(this);

    mpSocketListen->bind(QHostAddress::Any,60019);//

    connect(mpSocketListen,SIGNAL(readyRead()),this,SLOT(onRecvData()));

#ifdef ANDROID
    ui->pushButton_Start->setGeometry(100,100,600,100);
    ui->pushButton_Stop->setGeometry(100,300,600,100);
    ui->pushButton_Query->setGeometry(100,500,600,100);
    ui->plainTextEdit->setGeometry(100,800,600,600);
#endif

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_Start_clicked()
{
    ui->plainTextEdit->setPlainText("");
    int nCode = 1;
    char strout[100];
    memcpy(strout,&nCode,sizeof(int));
    mpSocket->writeDatagram(strout,sizeof(int),QHostAddress::Broadcast,60009);
}

void MainWindow::on_pushButton_Stop_clicked()
{
    ui->plainTextEdit->setPlainText("");
    int nCode = 0;
    char strout[100];
    memcpy(strout,&nCode,sizeof(int));
    mpSocket->writeDatagram(strout,sizeof(int),QHostAddress::Broadcast,60009);
}

void MainWindow::on_pushButton_Query_clicked()
{
    ui->plainTextEdit->setPlainText("");
    int nCode = 2;
    char strout[100];
    memcpy(strout,&nCode,sizeof(int));
    mpSocket->writeDatagram(strout,sizeof(int),QHostAddress::Broadcast,60009);
}

void MainWindow::onRecvData()
{
    while(mpSocketListen->hasPendingDatagrams())
    {
        QByteArray ba;
        ba.resize(static_cast<int>(mpSocketListen->bytesAvailable()) );
        mpSocketListen->readDatagram(ba.data(),ba.size());
        if(ba.size()>=2*static_cast<int>(sizeof(int)))
        {
            char * pdata = ba.data();
            int nsize = static_cast<int>(ba.size());
            int nservicecode,nservicestatus;
            memcpy(&nservicecode,pdata,sizeof(int));
            memcpy(&nservicestatus,pdata+sizeof(int),sizeof(int));
            unsigned long nerrorlen = static_cast<unsigned long>(nsize-2*static_cast<int>(sizeof(int)));
            std::shared_ptr<char> pstrerr_ptr = std::shared_ptr<char>(new char[nerrorlen +1]);
            if(nsize>2*static_cast<int>(sizeof(int)))
            {
                memcpy(pstrerr_ptr.get(),pdata+2*sizeof(int),nerrorlen);
                pstrerr_ptr.get()[nerrorlen] = 0;
            }
            switch (nservicestatus) {
            case 0:
                if(nservicecode == 0)
                {
                    ui->plainTextEdit->setPlainText("Init Status.");

                }
                else
                {
                    ui->plainTextEdit->setPlainText(pstrerr_ptr.get());
                }
                break;
            case 1:
                ui->plainTextEdit->setPlainText("Starting Service.");
                break;
            case 2:
                {
                    char strout[1000];
                    snprintf(strout,1000,"Service Code: %d",nservicecode);
                    ui->plainTextEdit->setPlainText(strout);
                }
                break;
            default:
                break;

            }
        }
    }
}