/*

  This file is part of serialplot.

  serialplot 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.

  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.

*/

#include <algorithm>

#include <QMetaEnum>

#include <QtDebug>

#include "qwt_symbol.h"

#include "plot.h"

#include "plotmanager.h"

#include "utils.h"

#include "setting_defines.h"

PlotManager::PlotManager(QWidget* plotArea, PlotMenu* menu,

                         ChannelInfoModel* infoModel, QObject* parent) :

    QObject(parent)

{

    _menu = menu;

    _plotArea = plotArea;

    _autoScaled = true;

    _yMin = 0;

    _yMax = 1;

    _xAxisAsIndex = true;

    isDemoShown = false;

    _infoModel = infoModel;

    _numOfSamples = 1;

    _plotWidth = 1;

    showSymbols = Plot::ShowSymbolsAuto;

    emptyPlot = NULL;

    // initalize layout and single widget

    isMulti = false;

    scrollArea = NULL;

    setupLayout(isMulti);

    addPlotWidget();

    // connect to  menu

    connect(menu, &PlotMenu::symbolShowChanged, this, &PlotManager:: setSymbols);

    connect(&menu->showGridAction, SELECT<bool>::OVERLOAD_OF(&QAction::toggled),

            this, &PlotManager::showGrid);

    connect(&menu->showMinorGridAction, SELECT<bool>::OVERLOAD_OF(&QAction::toggled),

            this, &PlotManager::showMinorGrid);

    connect(&menu->darkBackgroundAction, SELECT<bool>::OVERLOAD_OF(&QAction::toggled),

            this, &PlotManager::darkBackground);

    connect(&menu->showLegendAction, SELECT<bool>::OVERLOAD_OF(&QAction::toggled),

            this, &PlotManager::showLegend);

    connect(&menu->showMultiAction, SELECT<bool>::OVERLOAD_OF(&QAction::toggled),

            this, &PlotManager::setMulti);

    connect(&menu->unzoomAction, &QAction::triggered,

            this, &PlotManager::unzoom);

    // initial settings from menu actions

    showGrid(menu->showGridAction.isChecked());

    showMinorGrid(menu->showMinorGridAction.isChecked());

    darkBackground(menu->darkBackgroundAction.isChecked());

    showLegend(menu->showLegendAction.isChecked());

    setMulti(menu->showMultiAction.isChecked());

    // connect to channel info model

    if (_infoModel != NULL)     // TODO: remove when snapshots have infomodel

    {

        connect(_infoModel, &QAbstractItemModel::dataChanged,

                this, &PlotManager::onChannelInfoChanged);

        connect(_infoModel, &QAbstractItemModel::modelReset,

                [this]()

                {

                    onChannelInfoChanged(_infoModel->index(0, 0), // start

                                         _infoModel->index(_infoModel->rowCount()-1, 0), // end

                                         {}); // roles ignored

                });

    }

}

PlotManager::~PlotManager()

{

    while (curves.size())

    {

        delete curves.takeLast();

    }

    // remove all widgets

    while (plotWidgets.size())

    {

        delete plotWidgets.takeLast();

    }

    if (scrollArea != NULL) delete scrollArea;

    if (emptyPlot != NULL) delete emptyPlot;

}

void PlotManager::onChannelInfoChanged(const QModelIndex &topLeft,

                                       const QModelIndex &bottomRight,

                                       const QVector<int> &roles)

{

    int start = topLeft.row();

    int end = bottomRight.row();

    for (int ci = start; ci <= end; ci++)

    {

        QString name = topLeft.sibling(ci, ChannelInfoModel::COLUMN_NAME).data(Qt::EditRole).toString();

        QColor color = topLeft.sibling(ci, ChannelInfoModel::COLUMN_NAME).data(Qt::ForegroundRole).value<QColor>();

        bool visible = topLeft.sibling(ci, ChannelInfoModel::COLUMN_VISIBILITY).data(Qt::CheckStateRole).toBool();

        curves[ci]->setTitle(name);

        curves[ci]->setPen(color);

        curves[ci]->setVisible(visible);

        curves[ci]->setItemAttribute(QwtPlotItem::Legend, visible);

        // replot only updated widgets

        if (isMulti)

        {

            plotWidgets[ci]->updateSymbols(); // required for color change

            plotWidgets[ci]->updateLegend(curves[ci]);

            plotWidgets[ci]->setVisible(visible);

            if (visible)

            {

                plotWidgets[ci]->replot();

            }

        }

    }

    checkNoVisChannels();

    // replot single widget

    if (!isMulti)

    {

        plotWidgets[0]->updateSymbols();

        plotWidgets[0]->updateLegend();

        replot();

    }

}

void PlotManager::checkNoVisChannels()

{

    // if all channels are hidden show indicator

    bool allhidden = std::none_of(curves.cbegin(), curves.cend(),

                                  [](QwtPlotCurve* c) {return c->isVisible();});

    plotWidgets[0]->showNoChannel(allhidden);

    if (isMulti)

    {

        plotWidgets[0]->showNoChannel(allhidden);

        plotWidgets[0]->setVisible(true);

    }

}

void PlotManager::setMulti(bool enabled)

{

    if (enabled == isMulti) return;

    isMulti = enabled;

    // detach all curves

    for (auto curve : curves)

    {

        curve->detach();

    }

    // remove all widgets

    while (plotWidgets.size())

    {

        delete plotWidgets.takeLast();

    }

    // setup new layout

    setupLayout(isMulti);

    if (isMulti)

    {

        // add new widgets and attach

        for (auto curve : curves)

        {

            auto plot = addPlotWidget();

            plot->setVisible(curve->isVisible());

            curve->attach(plot);

        }

    }

    else

    {

        // add a single widget

        auto plot = addPlotWidget();

        // attach all curves

        for (auto curve : curves)

        {

            curve->attach(plot);

        }

    }

}

void PlotManager::setupLayout(bool multiPlot)

{

    // delete previous layout if it exists

    if (_plotArea->layout() != 0)

    {

        delete _plotArea->layout();

    }

    if (multiPlot)

    {

        // setup a scroll area

        scrollArea = new QScrollArea();

        auto scrolledPlotArea = new QWidget(scrollArea);

        scrollArea->setWidget(scrolledPlotArea);

        scrollArea->setWidgetResizable(true);

        _plotArea->setLayout(new QVBoxLayout());

        _plotArea->layout()->addWidget(scrollArea);

        _plotArea->layout()->setContentsMargins(0,0,0,0);

        layout = new QVBoxLayout(scrolledPlotArea);

    }

    else

    {

        // delete scrollArea left from multi layout

        if (scrollArea != NULL)

        {

            delete scrollArea;

            scrollArea = NULL;

        }

        layout = new QVBoxLayout(_plotArea);

    }

    layout->setContentsMargins(2,2,2,2);

    layout->setSpacing(1);

}

Plot* PlotManager::addPlotWidget()

{

    auto plot = new Plot();

    plotWidgets.append(plot);

    layout->addWidget(plot);

    plot->darkBackground(_menu->darkBackgroundAction.isChecked());

    plot->showGrid(_menu->showGridAction.isChecked());

    plot->showMinorGrid(_menu->showMinorGridAction.isChecked());

    plot->showLegend(_menu->showLegendAction.isChecked());

    plot->setSymbols(_menu->showSymbols());

    plot->showDemoIndicator(isDemoShown);

    plot->setYAxis(_autoScaled, _yMin, _yMax);

    plot->setNumOfSamples(_numOfSamples);

    plot->setPlotWidth(_plotWidth);

    if (_xAxisAsIndex)

    {

        plot->setXAxis(0, _numOfSamples);

    }

    else

    {

        plot->setXAxis(_xMin, _xMax);

    }

    return plot;

}

void PlotManager::addCurve(QString title, FrameBuffer* buffer)

{

    auto curve = new QwtPlotCurve(title);

    auto series = new FrameBufferSeries(buffer);

    series->setXAxis(_xAxisAsIndex, _xMin, _xMax);

    curve->setSamples(series);

    _addCurve(curve);

}

void PlotManager::addCurve(QString title, QVector<QPointF> data)

{

    auto curve = new QwtPlotCurve(title);

    curve->setSamples(data);

    _addCurve(curve);

}

void PlotManager::_addCurve(QwtPlotCurve* curve)

{

    // store and init the curve

    curves.append(curve);

    unsigned index = curves.size()-1;

    auto color = _infoModel->color(index);

    curve->setPen(color);

    // create the plot for the curve if we are on multi display

    Plot* plot;

    if (isMulti)

    {

        // create a new plot widget

        plot = addPlotWidget();

    }

    else

    {

        plot = plotWidgets[0];

    }

    // show the curve

    curve->attach(plot);

    plot->replot();

}

void PlotManager::removeCurves(unsigned number)

{

    for (unsigned i = 0; i < number; i++)

    {

        if (!curves.isEmpty())

        {

            delete curves.takeLast();

            if (isMulti) // delete corresponding widget as well

            {

                delete plotWidgets.takeLast();

            }

        }

    }

}

unsigned PlotManager::numOfCurves()

{

    return curves.size();

}

Plot* PlotManager::plotWidget(unsigned curveIndex)

{

    if (isMulti)

    {

        return plotWidgets[curveIndex];

    }

    else

    {

        return plotWidgets[0];

    }

}

void PlotManager::replot()

{

    for (auto plot : plotWidgets)

    {

        plot->replot();

    }

}

void PlotManager::showGrid(bool show)

{

    for (auto plot : plotWidgets)

    {

        plot->showGrid(show);

    }

}

void PlotManager::showMinorGrid(bool show)

{

    for (auto plot : plotWidgets)

    {

        plot->showMinorGrid(show);

    }

}

void PlotManager::showLegend(bool show)

{

    for (auto plot : plotWidgets)

    {

        plot->showLegend(show);

    }

}

void PlotManager::showDemoIndicator(bool show)

{

    isDemoShown = show;

    for (auto plot : plotWidgets)

    {

        plot->showDemoIndicator(show);

    }

}

void PlotManager::unzoom()

{

    for (auto plot : plotWidgets)

    {

        plot->unzoom();

    }

}