/*
 *  Copyright (C) 2015, Mike Walters <mike@flomp.net>
 *
 *  This file is part of inspectrum.
 *
 *  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 <QMessageBox>
#include <QtWidgets>
#include <QPixmapCache>
#include <QRubberBand>
#include <sstream>

#include "mainwindow.h"
#include "util.h"

MainWindow::MainWindow()
{
    setWindowTitle(tr("inspectrum"));

    QPixmapCache::setCacheLimit(40960);

    dock = new SpectrogramControls(tr("Controls"), this);
    dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
    addDockWidget(Qt::LeftDockWidgetArea, dock);

    input = new InputSource();

    plots = new PlotView(input);
    setCentralWidget(plots);

    createActions();

    // Connect dock inputs
    connect(dock, &SpectrogramControls::fftSizeChanged, plots, &PlotView::setFFTSize);
    connect(dock->powerMaxSlider, SIGNAL(valueChanged(int)), plots, SLOT(setPowerMax(int)));
    connect(dock->powerMinSlider, SIGNAL(valueChanged(int)), plots, SLOT(setPowerMin(int)));
    connect(dock->scalesCheckBox, &QCheckBox::stateChanged, plots, &PlotView::enableScales);
    connect(dock->cursorSymbolsSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), plots, &PlotView::setCursorSegments);

    // Connect dock outputs
    connect(plots, SIGNAL(timeSelectionChanged(float)), dock, SLOT(timeSelectionChanged(float)));

    // Set defaults after making connections so everything is in sync
    dock->setDefaults();

}

void MainWindow::createActions()
{
    QSettings settings;

    QToolBar *fileToolBar = addToolBar(tr("File"));
    const QIcon openIcon = QIcon::fromTheme("document-open");
    QAction *openAct = new QAction(openIcon, tr("&Open..."), this);
    openAct->setShortcuts(QKeySequence::Open);
    connect(openAct, &QAction::triggered, this, &MainWindow::fileOpenButtonClicked);
    fileToolBar->addAction(openAct);

    sampleRate = new QLineEdit();
    connect(sampleRate, &QLineEdit::textChanged, this, static_cast<void (MainWindow::*)(QString)>(&MainWindow::setSampleRate));
    int savedSampleRate = settings.value("SampleRate", 8000000).toInt();
    sampleRate->setText(QString::number(savedSampleRate));
    sampleRate->setValidator(new QIntValidator(this));
    fileToolBar->addWidget(new QLabel(tr("Sample rate: ")));
    fileToolBar->addWidget(sampleRate);

    QToolBar *zoomToolBar = addToolBar(tr("Zoom"));
    const QIcon zoomInIcon = QIcon::fromTheme("zoom-in");
    QAction *zoomInAct = new QAction(zoomInIcon, tr("Zoom in"), this);
    connect(zoomInAct, &QAction::triggered, plots, &PlotView::zoomIn);
    zoomToolBar->addAction(zoomInAct);

    const QIcon zoomOutIcon = QIcon::fromTheme("zoom-out");
    QAction *zoomOutAct = new QAction(zoomOutIcon, tr("Zoom out"), this);
    connect(zoomOutAct, &QAction::triggered, plots, &PlotView::zoomOut);
    zoomToolBar->addAction(zoomOutAct);

    QToolBar *cursorsToolBar = addToolBar(tr("Cursors"));
    const QIcon toggleCursorsIcon = QIcon(":/icons/show-cursors.svg");
    QAction *toggleCursorsAct = new QAction(toggleCursorsIcon, tr("Toggle cursors"), this);
    toggleCursorsAct->setCheckable(true);
    connect(toggleCursorsAct, &QAction::toggled, plots, &PlotView::enableCursors);
    cursorsToolBar->addAction(toggleCursorsAct);
}

void MainWindow::fileOpenButtonClicked()
{
    QSettings settings;
    QString fileName;
    QFileDialog fileSelect(this);
    fileSelect.setNameFilter(tr("All files (*);;"
                "complex<float> file (*.cfile *.cf32 *.fc32);;"
                "complex<int8> HackRF file (*.cs8 *.sc8 *.c8);;"
                "complex<int16> Fancy file (*.cs16 *.sc16 *.c16);;"
                "complex<uint8> RTL-SDR file (*.cu8 *.uc8)"));

    // Try and load a saved state
    {
        QByteArray savedState = settings.value("OpenFileState").toByteArray();
        fileSelect.restoreState(savedState);

        // Filter doesn't seem to be considered part of the saved state
        QString lastUsedFilter = settings.value("OpenFileFilter").toString();
        if(lastUsedFilter.size())
            fileSelect.selectNameFilter(lastUsedFilter);
    }

    if(fileSelect.exec())
    {
        fileName = fileSelect.selectedFiles()[0];

        // Remember the state of the dialog for the next time
        QByteArray dialogState = fileSelect.saveState();
        settings.setValue("OpenFileState", dialogState);
        settings.setValue("OpenFileFilter", fileSelect.selectedNameFilter());
    }

    if (!fileName.isEmpty())
        openFile(fileName);
}

void MainWindow::openFile(QString fileName)
{
    QString title="%1: %2";
    this->setWindowTitle(title.arg(QApplication::applicationName(),fileName.section('/',-1,-1)));

    // Try to parse osmocom_fft filenames and extract the sample rate and center frequency.
    // Example file name: "name-f2.411200e+09-s5.000000e+06-t20160807180210.cfile"
    QRegExp rx("(.*)-f(.*)-s(.*)-.*\\.cfile");
    QString basename = fileName.section('/',-1,-1);

    if (rx.exactMatch(basename)) {
        QString centerfreq = rx.cap(2);
        QString samplerate = rx.cap(3);

        std::stringstream ss(samplerate.toUtf8().constData());

        // Needs to be a double as the number is in scientific format
        double rate;
        ss >> rate;
        if (!ss.fail()) {
            setSampleRate(rate);
        }
    }

    try
    {
        input->openFile(fileName.toUtf8().constData());
    }
    catch (const std::exception &ex)
    {
        QMessageBox msgBox(QMessageBox::Critical, "Inspectrum openFile error", QString("%1: %2").arg(fileName).arg(ex.what()));
        msgBox.exec();
    }
}

void MainWindow::setSampleRate(QString rate)
{
    int sampleRate = rate.toInt();
    input->setSampleRate(sampleRate);
    plots->setSampleRate(sampleRate);

    // Save the sample rate in settings as we're likely to be opening the same file across multiple runs
    QSettings settings;
    settings.setValue("SampleRate", sampleRate);
}

void MainWindow::setSampleRate(int rate)
{
    sampleRate->setText(QString::number(rate));
}