#include <QtWidgets>

#include "pieview.h"
#include "mainwindow.h"

MainWindow::MainWindow()
{
    QMenuBar *menu_bar;
    QMenu *fileMenu = new QMenu(tr("&File"), this);

    QAction *openAction = fileMenu->addAction(tr("&Open..."));
    openAction->setShortcuts(QKeySequence::Open);

    QAction *saveAction = fileMenu->addAction(tr("&Save As..."));
    saveAction->setShortcuts(QKeySequence::SaveAs);

    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcuts(QKeySequence::Quit);

    setupModel( );
    setupViews( );

    connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
    connect(saveAction, SIGNAL(triggered()), this, SLOT(saveFile()));
    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

    menuBar()->addMenu(fileMenu);
    statusBar();

    openFile(":/Charts/qtdata.cht");

    setWindowTitle(tr("Dynamic Window Title"));
    resize(870, 550);

    return;
}

void MainWindow::setupModel()
{
    _model = new QStandardItemModel(8, 2, this);
    _model->setHeaderData(0, Qt::Horizontal, tr("Label"));
    _model->setHeaderData(1, Qt::Horizontal, tr("Quantity"));
}

void MainWindow::setupViews()
{
    QSplitter *splitter = new QSplitter;
    QTableView *table = new QTableView;
    pieChart = new PieView;
    splitter->addWidget(table);
    splitter->addWidget(pieChart);
    splitter->setStretchFactor(0, 0);
    splitter->setStretchFactor(1, 1);

    table->setModel( _model );
    pieChart->setModel( _model );

    QItemSelectionModel *selectionModel = new QItemSelectionModel( _model );
    table->setSelectionModel(selectionModel);
    pieChart->setSelectionModel(selectionModel);

    QHeaderView *headerView = table->horizontalHeader();
    headerView->setStretchLastSection(true);

    setCentralWidget(splitter);

    splitter->setAttribute(Qt::WA_AcceptTouchEvents);
    table->setAttribute(Qt::WA_AcceptTouchEvents);
    pieChart->setAttribute(Qt::WA_AcceptTouchEvents);

    return;
}

void MainWindow::openFile(const QString &path)
{
    QString fileName;

    if (path.isNull()) {
        fileName = QFileDialog::getOpenFileName( this,
                                                 tr("Choose a data file"), "", "*.cht");
    } else {
        fileName = path;
    }

    if (fileName.isEmpty()) {
        return;
    }

    QFile file(fileName);
    if (!file.open(QFile::ReadOnly | QFile::Text)) {
        return;
    }

    QTextStream stream(&file);
    QString line;

    _model->removeRows( 0, _model->rowCount( QModelIndex() ),
                        QModelIndex() );

    int row = 0;
    do {
        line = stream.readLine();
        if (!line.isEmpty()) {
            _model->insertRows(row, 1, QModelIndex());

            QStringList pieces = line.split(",", QString::SkipEmptyParts);
            _model->setData( _model->index(row, 0, QModelIndex()),
                           pieces.value(0));
            _model->setData( _model->index(row, 1, QModelIndex()),
                           pieces.value(1));
            _model->setData( _model->index(row, 0, QModelIndex()),
                           QColor(pieces.value(2)), Qt::DecorationRole);
            row++;
        }
    } while (!line.isEmpty());

    file.close();
    statusBar()->showMessage(tr("Loaded %1").arg(fileName), 2000);
}

void MainWindow::saveFile()
{
    QString fileName = QFileDialog::getSaveFileName( this,
        tr("Save file as"), "", "*.cht" );

    if (fileName.isEmpty())
        return;

    QFile file(fileName);
    if (!file.open(QFile::WriteOnly | QFile::Text))
        return;

    QTextStream stream(&file);
    for (int row = 0; row < _model->rowCount(QModelIndex()); ++row) {

        QStringList pieces;

        pieces.append( _model->data( _model->index(row, 0, QModelIndex()),
                                  Qt::DisplayRole).toString() );
        pieces.append( _model->data( _model->index(row, 1, QModelIndex()),
                                  Qt::DisplayRole).toString() );
        pieces.append( _model->data( _model->index(row, 0, QModelIndex()),
                                  Qt::DecorationRole).toString() );

        stream << pieces.join(',') << "\n";
    }

    file.close();
    statusBar()->showMessage(tr("Saved %1").arg(fileName), 2000);

    return;
}