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#include "performancediff.h"

#include "xmldata.h"

#include <QtXml>

#include <QFile>

#include <QStringList>

#include <QDateTime>

#include <QtDebug>

#include <iostream>

#include <iomanip>

static const int MIN_TEST_VAL = 20;

static const int TEST_EPSILON = 5; //ms

static void usage(const char *progname)

{

    std::cerr << "Couldn't find 'framework.ini' "

              << "file and no output has been specified."<<std::endl;

    std::cerr << "Usage: "<<progname

              << " oldDataDir"

              << " newDataDir\n"

              << std::endl;

}

PerformanceDiff::PerformanceDiff()

    : settings(0)

{

    if (QFile::exists("framework.ini")) {

        settings = new QSettings("framework.ini", QSettings::IniFormat);

    }

}

static void loadEngines(const QString &dirName,

                        QMap<QString, XMLEngine*> &engines)

{

    QDir dir(dirName);

    dir.setFilter(QDir::Dirs | QDir::NoSymLinks | QDir::NoDotAndDotDot);

    QFileInfoList list = dir.entryInfoList();

    for (int i = 0; i < list.size(); ++i) {

        QFileInfo fileInfo = list.at(i);

        QString dataFile = QString("%1/data.xml")

                           .arg(fileInfo.absoluteFilePath());

        if (QFile::exists(dataFile)) {

            XMLReader handler;

            QXmlSimpleReader reader;

            reader.setContentHandler(&handler);

            reader.setErrorHandler(&handler);

            QFile file(dataFile);

            if (!file.open(QFile::ReadOnly | QFile::Text)) {

                qWarning("Cannot open file '%s', because: %s",

                         qPrintable(dataFile), qPrintable(file.errorString()));

                continue;

            }

            QXmlInputSource xmlInputSource(&file);

            if (reader.parse(xmlInputSource)) {

                XMLEngine *engine = handler.xmlEngine();

                engines.insert(engine->name, engine);

            }

        }

    }

}

void PerformanceDiff::run(int argc, char **argv)

{

    processArguments(argc, argv);

    loadEngines(inputDirName, inputEngines);

    loadEngines(diffDirName, diffEngines);

    if (inputEngines.isEmpty() || diffEngines.isEmpty()) {

        usage(argv[0]);

        return;

    }

    generateDiff();

    //generateOutput();

}

void PerformanceDiff::processArguments(int argc, char **argv)

{

    if (argc != 3)

        return;

    inputDirName = QString(argv[1]);

    diffDirName  = QString(argv[2]);

}

void PerformanceDiff::generateDiff()

{

    qreal totalIn   = 0;

    qreal totalDiff = 0;

    std::cout<<std::setiosflags(std::ios::left)<<std::setw(30)<<"Testcase"

             <<std::setiosflags(std::ios::right)

             <<std::setw(10) <<"Before"

             <<std::setw(15) <<"After"

             <<std::setw(20) <<"Difference"<<std::endl;

    std::cout << std::resetiosflags(std::ios::right);

    std::cout << std::resetiosflags(std::ios::left);

    std::cout<<std::setfill('-')<<std::setw(75)<<'-'<<std::endl;

    foreach(XMLEngine *diffEngine, diffEngines) {

        XMLEngine *inEngine = inputEngines[diffEngine->name];

        if (!inEngine)

            continue;

        foreach(XMLSuite *diffSuite, diffEngine->suites) {

            XMLSuite *inSuite = inEngine->suites[diffSuite->name];

            if (!inSuite)

                continue;

            foreach(XMLFile *diffFile, diffSuite->files) {

                XMLFile *inFile = inSuite->files[diffFile->name];

                if (!inFile)

                    continue;

                qreal inAvg   = 0;

                qreal diffAvg = 0;

                qreal inMin   = 0;

                qreal inMax   = 0;

                foreach(XMLData data, inFile->data) {

                    inAvg = (double(data.timeToRender)/data.iterations);

                    if (!inMin)

                        inMin = data.minElapsed;

                    else if (data.minElapsed < inMin)

                        inMin = data.minElapsed;

                    if (!inMax)

                        inMax = data.maxElapsed;

                    else if (inMax < data.maxElapsed)

                        inMax = data.maxElapsed;

                }

                //skipping really small tests

                if (inAvg < MIN_TEST_VAL) {

                    continue;

                }

                totalIn += inAvg;

                foreach(XMLData data, diffFile->data) {

                    diffAvg = (double(data.timeToRender)/data.iterations);

                }

                totalDiff += diffAvg;

                QFileInfo fi(diffFile->name);

                std::cout.width(80);

                std::cout.setf(std::ios::fixed, std::ios::floatfield);

                std::cout.setf(std::ios::showpoint);

                std::cout << std::resetiosflags(std::ios::right);

                std::cout << std::resetiosflags(std::ios::left);

                std::cout<<std::setw(30)<<std::setfill('.')<<std::setiosflags(std::ios::left)

                         <<qPrintable(fi.fileName())<<"\t";

                std::cout<<std::setfill(' ')<<std::setprecision(2)

                         <<std::setiosflags(std::ios::right)

                         <<std::setw(8)<<std::setiosflags(std::ios::right)<<inAvg<<"\t"

                         <<std::setw(8)<<diffAvg<<"\t"

                         <<std::setw(7)<< ((1.0-(diffAvg/inAvg))*100.0) <<"%";

                if (diffAvg < inMin &&

                    (qAbs(inMin - diffAvg) > TEST_EPSILON)) {

                    std::cout<<" + ("<<inMin<<")";

                }

                if (diffAvg > inMax &&

                    (qAbs(diffAvg - inMax) > TEST_EPSILON)) {

                    std::cout<<" - ("<<inMax<<")";

                }

                std::cout<<std::endl;

            }

        }

    }

    std::cout << std::resetiosflags(std::ios::right);

    std::cout << std::resetiosflags(std::ios::left);

    std::cout<<std::setfill('-')<<std::setw(75)<<'-'<<std::endl;

}