#include "expxmldownloader.h"
#include <QDebug>
#include <QFile>
#include <QQueue>
#include <QDate>
#include <QDateTime>

ExpXmlDownLoader::ExpXmlDownLoader(QObject *parent) : QObject(parent)
{
    this->m_doc = NULL;
}

ExpXmlDownLoader::~ExpXmlDownLoader()
{

}

bool ExpXmlDownLoader::parseXml(const QString &fileName)
{
    QQueue<QString> nodes;
    nodes<<"RESOURCE"<<"TABLE"<<"DATA"<<"TABLEDATA";
    if(m_doc!=NULL)
        delete m_doc;
    m_doc = new QDomDocument(fileName);
    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly))
        return false;
    if (!m_doc->setContent(&file)) {
        file.close();
        return false;
    }
    file.close();
    if(m_doc->isNull())
    {
        delete m_doc;
        return false;
    }
    QDomElement docElem = m_doc->documentElement();
    QDomNode n = docElem.firstChild();
    while(!n.isNull() && !nodes.empty())
    {
        if(n.toElement().tagName()==nodes.head())
        {
            nodes.dequeue();
            n=n.firstChild();
        }
        else
        {
            n = n.nextSibling();
        }
    }
    extractIntervals(n);
    makeDownloadList();
    return true;
}

const QList<QDate> &ExpXmlDownLoader::daysToDownload()
{
    return m_FilesToDownload;
}

void ExpXmlDownLoader::extractIntervals(QDomNode n)
{
    QDomNode inter;
    m_intervals.clear();
    while(!n.isNull())
    {
        if(n.toElement().tagName()=="TR")
        {
            ExpXmlDownLoaderIntervals interval;
            inter=n.firstChild();
            if(inter.toElement().tagName()=="TD")
            {
                interval.start = inter.toElement().text();
            }
            inter=inter.nextSibling();
            if(inter.toElement().tagName()=="TD")
            {
                interval.stop = inter.toElement().text();
            }
            m_intervals.append(interval);
        }
        n = n.nextSibling();
    }
}

void ExpXmlDownLoader::makeDownloadList()
{
    for(int i=0;i<m_intervals.count();i++)
    {
        QList<QDate> daysToDl;
        QDateTime start,stop;
        start=start.fromString(m_intervals[i].start,Qt::ISODate);
        stop=stop.fromString(m_intervals[i].stop,Qt::ISODate);
        int days=start.daysTo(stop);
        daysToDl.append(start.date());
        if(days)
        {
            for(int j=0;j<days;j++)
            {
                daysToDl.append(start.addDays(j+1).date());
            }
        }
        addDaysToDownload(daysToDl);
    }
    qDebug()<<m_FilesToDownload.count();
}

void ExpXmlDownLoader::addDaysToDownload(QList<QDate> days)
{
    for(int i=0;i<days.count();i++)
    {
        if(!m_FilesToDownload.contains(days.at(i)))
        {
            m_FilesToDownload.append(days.at(i));
        }
    }
}