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#include "dialog.h"

int uniqueAlbumId;

int uniqueArtistId;

Dialog::Dialog(QSqlRelationalTableModel *albums, QDomDocument details,

               QFile *output, QWidget *parent)

     : QDialog(parent)

{

    model = albums;

    albumDetails = details;

    outputFile = output;

    QGroupBox *inputWidgetBox = createInputWidgets();

    QDialogButtonBox *buttonBox = createButtons();

    QVBoxLayout *layout = new QVBoxLayout;

    layout->addWidget(inputWidgetBox);

    layout->addWidget(buttonBox);

    setLayout(layout);

    setWindowTitle(tr("Add Album"));

}

void Dialog::submit()

{

    QString artist = artistEditor->text();

    QString title = titleEditor->text();

    if (artist.isEmpty() || title.isEmpty()) {

        QString message(tr("Please provide both the name of the artist "

                           "and the title of the album."));

        QMessageBox::information(this, tr("Add Album"), message);

    } else {

        int artistId = findArtistId(artist);

        int albumId = addNewAlbum(title, artistId);

        QStringList tracks;

        tracks = tracksEditor->text().split(',', QString::SkipEmptyParts);

        addTracks(albumId, tracks);

        increaseAlbumCount(indexOfArtist(artist));

        accept();

    }

}

int Dialog::findArtistId(const QString &artist)

{

    QSqlTableModel *artistModel = model->relationModel(2);

    int row = 0;

    while (row < artistModel->rowCount()) {

        QSqlRecord record = artistModel->record(row);

        if (record.value("artist") == artist)

            return record.value("id").toInt();

        else

            row++;

    }

    return addNewArtist(artist);

}

int Dialog::addNewArtist(const QString &name)

{

    QSqlTableModel *artistModel = model->relationModel(2);

    QSqlRecord record;

    int id = generateArtistId();

    QSqlField f1("id", QVariant::Int);

    QSqlField f2("artist", QVariant::String);

    QSqlField f3("albumcount", QVariant::Int);

    f1.setValue(QVariant(id));

    f2.setValue(QVariant(name));

    f3.setValue(QVariant(0));

    record.append(f1);

    record.append(f2);

    record.append(f3);

    artistModel->insertRecord(-1, record);

    return id;

}

int Dialog::addNewAlbum(const QString &title, int artistId)

{

    int id = generateAlbumId();

    QSqlRecord record;

    QSqlField f1("albumid", QVariant::Int);

    QSqlField f2("title", QVariant::String);

    QSqlField f3("artistid", QVariant::Int);

    QSqlField f4("year", QVariant::Int);

    f1.setValue(QVariant(id));

    f2.setValue(QVariant(title));

    f3.setValue(QVariant(artistId));

    f4.setValue(QVariant(yearEditor->value()));

    record.append(f1);

    record.append(f2);

    record.append(f3);

    record.append(f4);

    model->insertRecord(-1, record);

    return id;

}

void Dialog::addTracks(int albumId, QStringList tracks)

{

    QDomElement albumNode = albumDetails.createElement("album");

    albumNode.setAttribute("id", albumId);

    for (int i = 0; i < tracks.count(); i++) {

        QString trackNumber = QString::number(i);

        if (i < 10)

            trackNumber.prepend("0");

        QDomText textNode = albumDetails.createTextNode(tracks.at(i));

        QDomElement trackNode = albumDetails.createElement("track");

        trackNode.setAttribute("number", trackNumber);

        trackNode.appendChild(textNode);

        albumNode.appendChild(trackNode);

    }

    QDomNodeList archive = albumDetails.elementsByTagName("archive");

    archive.item(0).appendChild(albumNode);

/*

    The following code is commented out since the example uses an in

    memory database, i.e., altering the XML file will bring the data

    out of sync.

    if (!outputFile->open(QIODevice::WriteOnly)) {

        return;

    } else {

        QTextStream stream(outputFile);

        archive.item(0).save(stream, 4);

        outputFile->close();

    }

*/

}

void Dialog::increaseAlbumCount(QModelIndex artistIndex)

{

    QSqlTableModel *artistModel = model->relationModel(2);

    QModelIndex albumCountIndex;

    albumCountIndex = artistIndex.sibling(artistIndex.row(), 2);

    int albumCount = albumCountIndex.data().toInt();

    artistModel->setData(albumCountIndex, QVariant(albumCount + 1));

}

void Dialog::revert()

{

    artistEditor->clear();

    titleEditor->clear();

    yearEditor->setValue(QDate::currentDate().year());

    tracksEditor->clear();

}

QGroupBox *Dialog::createInputWidgets()

{

    QGroupBox *box = new QGroupBox(tr("Add Album"));

    QLabel *artistLabel = new QLabel(tr("Artist:"));

    QLabel *titleLabel = new QLabel(tr("Title:"));

    QLabel *yearLabel = new QLabel(tr("Year:"));

    QLabel *tracksLabel = new QLabel(tr("Tracks (separated by comma):"));

    artistEditor = new QLineEdit;

    titleEditor = new QLineEdit;

    yearEditor = new QSpinBox;

    yearEditor->setMinimum(1900);

    yearEditor->setMaximum(QDate::currentDate().year());

    yearEditor->setValue(yearEditor->maximum());

    yearEditor->setReadOnly(false);

    tracksEditor = new QLineEdit;

    QGridLayout *layout = new QGridLayout;

    layout->addWidget(artistLabel, 0, 0);

    layout->addWidget(artistEditor, 0, 1);

    layout->addWidget(titleLabel, 1, 0);

    layout->addWidget(titleEditor, 1, 1);

    layout->addWidget(yearLabel, 2, 0);

    layout->addWidget(yearEditor, 2, 1);

    layout->addWidget(tracksLabel, 3, 0, 1, 2);

    layout->addWidget(tracksEditor, 4, 0, 1, 2);

    box->setLayout(layout);

    return box;

}

QDialogButtonBox *Dialog::createButtons()

{

    QPushButton *closeButton = new QPushButton(tr("&Close"));

    QPushButton *revertButton = new QPushButton(tr("&Revert"));

    QPushButton *submitButton = new QPushButton(tr("&Submit"));

    closeButton->setDefault(true);

    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

    connect(revertButton, SIGNAL(clicked()), this, SLOT(revert()));

    connect(submitButton, SIGNAL(clicked()), this, SLOT(submit()));

    QDialogButtonBox *buttonBox = new QDialogButtonBox;

    buttonBox->addButton(submitButton, QDialogButtonBox::ResetRole);

    buttonBox->addButton(revertButton, QDialogButtonBox::ResetRole);

    buttonBox->addButton(closeButton, QDialogButtonBox::RejectRole);

    return buttonBox;

}

QModelIndex Dialog::indexOfArtist(const QString &artist)

{

    QSqlTableModel *artistModel = model->relationModel(2);

    for (int i = 0; i < artistModel->rowCount(); i++) {

        QSqlRecord record =  artistModel->record(i);

        if (record.value("artist") == artist)

            return artistModel->index(i, 1);

    }

    return QModelIndex();

}

int Dialog::generateArtistId()

{

    uniqueArtistId += 1;

    return uniqueArtistId;

}

int Dialog::generateAlbumId()

{

    uniqueAlbumId += 1;

    return uniqueAlbumId;

}