/**********************************************************************
XyGrib: meteorological GRIB file viewer
Copyright (C) 2008-2012 - Jacques Zaninetti - http://www.zygrib.org

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/

#include <QApplication>
#include <QTextStream>
#include <QDomDocument>
#include <QNetworkProxy>
#include <QMessageBox>

#include <cassert>
#include <cmath>

#include "FileLoaderGRIB.h"
#include "Util.h"
#include "Version.h"

//========================================================================
FileLoaderGRIB::FileLoaderGRIB (QNetworkAccessManager *manager, QWidget *parent)
			: FileLoader (manager)
{
	this->parent = parent;
    step = 0;
	downloadError = false;
    reply_step1 = nullptr;
    reply_step2 = nullptr;
    scriptpath = "/";
}
//-------------------------------------------------------------------------------
FileLoaderGRIB::~FileLoaderGRIB () 
{
	if (reply_step1) {
		reply_step1->deleteLater ();
        reply_step1 = nullptr;
	}
	if (reply_step2) {
		reply_step2->deleteLater ();
        reply_step2 = nullptr;
	}
}

//-------------------------------------------------------------------------------
void FileLoaderGRIB::stop () 
{
	if (reply_step1) {
		reply_step1->close ();
		downloadError = true;
	}
	if (reply_step2) {
		reply_step2->close ();
		downloadError = true;
	}
}

//-------------------------------------------------------------------------------
void FileLoaderGRIB::getGribFile(
        const QString& atmModel,
        float x0, float x1, float y0, float y1,
        float resolution, int interval, int days,
        const QString& cycle,
        bool wind, bool pressure, bool rain,
        bool cloud, bool temp, bool humid, bool isotherm0,
        bool snowDepth,
		bool snowCateg, bool frzRainCateg,
        bool CAPEsfc, bool CINsfc, bool reflectivity,
		bool altitudeData200,
		bool altitudeData300,
		bool altitudeData400,
		bool altitudeData500,
		bool altitudeData600,
		bool altitudeData700,
		bool altitudeData850,
		bool altitudeData925,
		bool skewTData,
		bool GUSTsfc,
        const QString& wvModel,
        bool sgwh,
        bool swell,
        bool wwav
	)
{
    QString page;
	step = 0;
    //----------------------------------------------------------------
    // Step 1: Request the creation of the Grib file (status, name, size & checksum in return)
    //----------------------------------------------------------------
    // build the parameter string
    QString parameters = "";
    if (wind) {
        parameters += "W;";
    }
    if (pressure && (atmModel != "ECMWF" && atmModel != "Arpege-EU" && atmModel != "Arome 0.025°")) {
        parameters += "P;";
    }
    if (pressure && (atmModel == "ECMWF" || atmModel == "Arpege-EU" || atmModel == "Arome 0.025°")){
        parameters += "p;";
    }
    if (rain) {
        parameters += "R;";
    }
    if (cloud) {
        parameters += "C;";
    }
    if (temp) {
        parameters += "T;";
    }
    if (humid) {
        parameters += "H;";
    }
	if (isotherm0) {
		parameters += "I;";
    }    
//    if (tempMin) {
//        parameters += "m;";
//    }
//    if (tempMax) {
//        parameters += "M;";
//    }
    if (snowDepth) {
        parameters += "S;";
    }
    if (snowCateg) {
        parameters += "s;";
    }
    if (frzRainCateg) {
        parameters += "Z;";
    }
    if (CAPEsfc) {
        parameters += "c;";
    }
    if (CINsfc) {
        parameters += "i;";
    }
    if (reflectivity) {
        parameters += "r;";
    }
    if (GUSTsfc) {
        parameters += "G;";
    }
//    if (SUNSDsfc) { // not currently used
//        parameters += "D;";
//    }
	
    if (altitudeData200) parameters += "2;";
    if (altitudeData300) parameters += "3;";
    if (altitudeData400) parameters += "4;";
    if (altitudeData500) parameters += "5;";
    if (altitudeData600) parameters += "6;";
    if (altitudeData700) parameters += "7;";
    if (altitudeData850) parameters += "8;";
    if (altitudeData925) parameters += "9;";
//    if (cloudLayers) parameters += "L;";
	if (skewTData)  parameters += "skewt;";
	

    // wave parameters have their own string
    QString waveParams = "";
    if (sgwh) {
        waveParams += "s;";
    }
    if (swell) {
        waveParams += "H;D;P;";
    }
    if (wwav) {
        waveParams += "h;d;p;";
    }

    // model identifier (combines resolution)
    QString amod = "";
    if (atmModel == "GFS" && resolution == 0.25 ){
        amod = "gfs_p25_";
    } else if (atmModel == "GFS" && resolution == 0.50 ){
        amod = "gfs_p50_";
    } else if (atmModel == "GFS" && resolution == 1.0 ){
        amod = "gfs_1p0_";
    } else if (atmModel == "ICON"){
        amod = "icon_p25_";
    } else if (atmModel == "Arpege"){
        amod = "arpege_p50_";
    } else if (atmModel == "ECMWF"){
        amod = "ecmwf_p50_";
    } else if (atmModel == "NAM CONUS"){
        amod = "nam_conus_12km_";
    } else if (atmModel == "NAM CACBN"){
        amod = "nam_cacbn_12km_";
    } else if (atmModel == "NAM PACIFIC"){
        amod = "nam_pacific_12km_";
    } else if (atmModel == "ICON-EU"){
        amod = "icon_eu_p06_";
    } else if (atmModel == "Arpege-EU"){
        amod = "arpege_eu_p10_";
    } else if (atmModel == "Arome 0.025°"){
        amod = "arome_p025_";
    } else if (atmModel == "None"){
        amod = "none";
    }

    // wave model identifier
    QString wmod = "";
    if (wvModel == "WW3"){
        wmod = "ww3_p50_";
    } else if (wvModel == "GWAM" ){
        wmod = "gwam_p25_";
    } else if (wvModel == "EWAM"){
        wmod = "ewam_p05_";
    } else if (wvModel == "None"){
        wmod = "none";
    }

//    QString runCycle = Util::getSetting("downloadRunCycle", "last").toString().toLower();
    //strbuf.clear();
    if (!(parameters == "" && waveParams == ""))
    {
        step = 1;
        emit signalGribSendMessage(
                tr("Preparing file on server... Please wait..."));
        emit signalGribReadProgress(step, 0, 0);


        QString phpfilename = scriptpath+ "getmygribs2.php?";
        QString appVer = Version::getVersion();
        QString ptype = "Unknown";
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
        ptype = QSysInfo::productType();
#endif
        QTextStream(&page) << phpfilename
                           << "osys=" << ptype
                           << "&ver=" << appVer
                           << "&model=" << amod
                           << "&la1=" << y0
                           << "&la2=" << y1
                           << "&lo1=" << x0
                           << "&lo2=" << x1
                           << "&intv=" << interval
                           << "&days=" << days
                           << "&cyc=" << cycle
                           << "&par=" << parameters
                           << "&wmdl=" << wmod
                           << "&wpar=" << waveParams
                           ;
//                            << "&client=" << Version::getCompleteName()

        QNetworkRequest request = Util::makeNetworkRequest ("http://"+Util::getServerName()+page);
		reply_step1 = networkManager->get (request);
		connect (reply_step1, SIGNAL(downloadProgress (qint64,qint64)), 
				 this, SLOT(downloadProgress (qint64,qint64)));
		connect (reply_step1, SIGNAL(error(QNetworkReply::NetworkError)),
				 this, SLOT(slotNetworkError (QNetworkReply::NetworkError)));
		connect (reply_step1, SIGNAL(finished()),
				 this, SLOT(slotFinished_step1 ()));
    }
    else
    {
        QMessageBox::warning(parent, tr("Bad Request"), tr("No atmospheric or wave parameters were selected"));
    }
}
//-------------------------------------------------------------------------------
void FileLoaderGRIB::slotNetworkError (QNetworkReply::NetworkError /*err*/)
{
	if (! downloadError) {
		if (sender() == reply_step1) {
			emit signalGribLoadError (reply_step1->errorString());
			downloadError = true;
		}
		else if (sender() == reply_step2) {
			emit signalGribLoadError (reply_step2->errorString());
			downloadError = true;
		}
	}
}
//-------------------------------------------------------------------------------
void FileLoaderGRIB::downloadProgress (qint64 done, qint64 total)
{
	if (downloadError) {
		step = 1000;
		return;
	}
	if (sender() == reply_step2) {
		emit signalGribReadProgress (step, done, total);
	}
}
//-------------------------------------------------------------------------------
void FileLoaderGRIB::slotFinished_step1 ()
{
DBG("slotFinished_step1");
	if (!downloadError) {
		//-------------------------------------------
        // Back from step 1: preparing the file
		//-------------------------------------------
        //xserv=reply_step1->rawHeader("XServer");
        //strbuf.append(xserv);
		QByteArray data = reply_step1->readAll ();
        QJsonDocument jsondoc = QJsonDocument::fromJson(data);
        QJsonObject jsondata = jsondoc.object();

        bool status = jsondata["status"].toBool();
        // if the result is valid the status is true and the message contains object
        // with name, size and checksum
        if (status) {
            QJsonObject msg = jsondata["message"].toObject();
            fileName = msg["url"].toString();
            fileSize = msg["size"].toInt();
            checkSumSHA1 = msg["sha1"].toString();

        }else{ // message contains only the error message
            QString m = jsondata["message"].toString();
//            QMessageBox::warning(parent, tr("Information"), m);
            emit signalGribLoadError(m);
            downloadError = true;
            reply_step1->close();
        }

		//-------------------------------------------------------------
        // Start Step 2: Request the contents of the Grib file
		//-------------------------------------------------------------
        if (status) {
            step = 2;
            QString s;
            s = tr("Total size : ") + QString("%1 kb").arg(fileSize/1024, 0);
            emit signalGribSendMessage(s);
            emit signalGribStartLoadData();            
			QNetworkRequest request;
            request.setUrl (QUrl(fileName));
            reply_step2 = networkManager->get (request);
			connect (reply_step2, SIGNAL(downloadProgress (qint64,qint64)), 
					 this, SLOT(downloadProgress (qint64,qint64)));
			connect (reply_step2, SIGNAL(error(QNetworkReply::NetworkError)),
					 this, SLOT(slotNetworkError (QNetworkReply::NetworkError)));
			connect (reply_step2, SIGNAL(finished()),
					this, SLOT(slotFinished_step2 ()));
		}
		else {
			downloadError = true;
		}
	}
}
//-------------------------------------------------------------------------------
void FileLoaderGRIB::slotFinished_step2 ()
{
// DBG("slotFinished_step2");		
	if (!downloadError) {
		step = 1000;
		arrayContent = reply_step2->readAll ();
		if (arrayContent.size() < 80) {
			emit signalGribLoadError (tr("Empty file."));
			return;
		}
		emit signalGribSendMessage(tr("CheckSum control"));
		if (Util::sha1 (arrayContent) == checkSumSHA1)
		{
			emit signalGribSendMessage(tr("Finish")
                            + QString(" %1 kb").arg(arrayContent.size()/1024.0,0,'f',1));
            // TODO not sure about the .grb thing here
			emit signalGribDataReceived(&arrayContent, fileName.replace("%20",".grb"));
		}
		else {
			emit signalGribLoadError (tr("Bad checksum."));
		}
	}
}