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#include "browser.h"

#include "qsqlconnectiondialog.h"

#include <QtGui>

#include <QtSql>

Browser::Browser(QWidget *parent)

    : QWidget(parent)

{

    setupUi(this);

    table->addAction(insertRowAction);

    table->addAction(deleteRowAction);

    if (QSqlDatabase::drivers().isEmpty())

        QMessageBox::information(this, tr("No database drivers found"),

                                 tr("This demo requires at least one Qt database driver. "

                                    "Please check the documentation how to build the "

                                    "Qt SQL plugins."));

    emit statusMessage(tr("Ready."));

}

Browser::~Browser()

{

}

void Browser::exec()

{

    QSqlQueryModel *model = new QSqlQueryModel(table);

    model->setQuery(QSqlQuery(sqlEdit->toPlainText(), connectionWidget->currentDatabase()));

    table->setModel(model);

    if (model->lastError().type() != QSqlError::NoError)

        emit statusMessage(model->lastError().text());

    else if (model->query().isSelect())

        emit statusMessage(tr("Query OK."));

    else

        emit statusMessage(tr("Query OK, number of affected rows: %1").arg(

                           model->query().numRowsAffected()));

    updateActions();

}

QSqlError Browser::addConnection(const QString &driver, const QString &dbName, const QString &host,

                            const QString &user, const QString &passwd, int port)

{

    static int cCount = 0;

    QSqlError err;

    QSqlDatabase db = QSqlDatabase::addDatabase(driver, QString("Browser%1").arg(++cCount));

    db.setDatabaseName(dbName);

    db.setHostName(host);

    db.setPort(port);

    if (!db.open(user, passwd)) {

        err = db.lastError();

        db = QSqlDatabase();

        QSqlDatabase::removeDatabase(QString("Browser%1").arg(cCount));

    }

    connectionWidget->refresh();

    return err;

}

void Browser::addConnection()

{

    QSqlConnectionDialog dialog(this);

    if (dialog.exec() != QDialog::Accepted)

        return;

    if (dialog.useInMemoryDatabase()) {

        QSqlDatabase::database("in_mem_db", false).close();

        QSqlDatabase::removeDatabase("in_mem_db");

        QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", "in_mem_db");

        db.setDatabaseName(":memory:");

        if (!db.open())

            QMessageBox::warning(this, tr("Unable to open database"), tr("An error occurred while "

                                                                         "opening the connection: ") + db.lastError().text());

        QSqlQuery q("", db);

        q.exec("drop table Movies");

        q.exec("drop table Names");

        q.exec("create table Movies (id integer primary key, Title varchar, Director varchar, Rating number)");

        q.exec("insert into Movies values (0, 'Metropolis', 'Fritz Lang', '8.4')");

        q.exec("insert into Movies values (1, 'Nosferatu, eine Symphonie des Grauens', 'F.W. Murnau', '8.1')");

        q.exec("insert into Movies values (2, 'Bis ans Ende der Welt', 'Wim Wenders', '6.5')");

        q.exec("insert into Movies values (3, 'Hardware', 'Richard Stanley', '5.2')");

        q.exec("insert into Movies values (4, 'Mitchell', 'Andrew V. McLaglen', '2.1')");

        q.exec("create table Names (id integer primary key, Firstname varchar, Lastname varchar, City varchar)");

        q.exec("insert into Names values (0, 'Sala', 'Palmer', 'Morristown')");

        q.exec("insert into Names values (1, 'Christopher', 'Walker', 'Morristown')");

        q.exec("insert into Names values (2, 'Donald', 'Duck', 'Andeby')");

        q.exec("insert into Names values (3, 'Buck', 'Rogers', 'Paris')");

        q.exec("insert into Names values (4, 'Sherlock', 'Holmes', 'London')");

        connectionWidget->refresh();

    } else {

        QSqlError err = addConnection(dialog.driverName(), dialog.databaseName(), dialog.hostName(),

                           dialog.userName(), dialog.password(), dialog.port());

        if (err.type() != QSqlError::NoError)

            QMessageBox::warning(this, tr("Unable to open database"), tr("An error occurred while "

                                       "opening the connection: ") + err.text());

    }

}

void Browser::showTable(const QString &t)

{

    QSqlTableModel *model = new QSqlTableModel(table, connectionWidget->currentDatabase());

    model->setEditStrategy(QSqlTableModel::OnRowChange);

    model->setTable(connectionWidget->currentDatabase().driver()->escapeIdentifier(t, QSqlDriver::TableName));

    model->select();

    if (model->lastError().type() != QSqlError::NoError)

        emit statusMessage(model->lastError().text());

    table->setModel(model);

    table->setEditTriggers(QAbstractItemView::DoubleClicked|QAbstractItemView::EditKeyPressed);

    connect(table->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),

            this, SLOT(currentChanged()));

    updateActions();

}

void Browser::showMetaData(const QString &t)

{

    QSqlRecord rec = connectionWidget->currentDatabase().record(t);

    QStandardItemModel *model = new QStandardItemModel(table);

    model->insertRows(0, rec.count());

    model->insertColumns(0, 7);

    model->setHeaderData(0, Qt::Horizontal, "Fieldname");

    model->setHeaderData(1, Qt::Horizontal, "Type");

    model->setHeaderData(2, Qt::Horizontal, "Length");

    model->setHeaderData(3, Qt::Horizontal, "Precision");

    model->setHeaderData(4, Qt::Horizontal, "Required");

    model->setHeaderData(5, Qt::Horizontal, "AutoValue");

    model->setHeaderData(6, Qt::Horizontal, "DefaultValue");

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

        QSqlField fld = rec.field(i);

        model->setData(model->index(i, 0), fld.name());

        model->setData(model->index(i, 1), fld.typeID() == -1

                ? QString(QVariant::typeToName(fld.type()))

                : QString("%1 (%2)").arg(QVariant::typeToName(fld.type())).arg(fld.typeID()));

        model->setData(model->index(i, 2), fld.length());

        model->setData(model->index(i, 3), fld.precision());

        model->setData(model->index(i, 4), fld.requiredStatus() == -1 ? QVariant("?")

                : QVariant(bool(fld.requiredStatus())));

        model->setData(model->index(i, 5), fld.isAutoValue());

        model->setData(model->index(i, 6), fld.defaultValue());

    }

    table->setModel(model);

    table->setEditTriggers(QAbstractItemView::NoEditTriggers);

    updateActions();

}

void Browser::insertRow()

{

    QSqlTableModel *model = qobject_cast<QSqlTableModel *>(table->model());

    if (!model)

        return;

    QModelIndex insertIndex = table->currentIndex();

    int row = insertIndex.row() == -1 ? 0 : insertIndex.row();

    model->insertRow(row);

    insertIndex = model->index(row, 0);

    table->setCurrentIndex(insertIndex);

    table->edit(insertIndex);

}

void Browser::deleteRow()

{

    QSqlTableModel *model = qobject_cast<QSqlTableModel *>(table->model());

    if (!model)

        return;

    model->setEditStrategy(QSqlTableModel::OnManualSubmit);

    QModelIndexList currentSelection = table->selectionModel()->selectedIndexes();

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

        if (currentSelection.at(i).column() != 0)

            continue;

        model->removeRow(currentSelection.at(i).row());

    }

    model->submitAll();

    model->setEditStrategy(QSqlTableModel::OnRowChange);

    updateActions();

}

void Browser::updateActions()

{

    bool enableIns = qobject_cast<QSqlTableModel *>(table->model());

    bool enableDel = enableIns && table->currentIndex().isValid();

    insertRowAction->setEnabled(enableIns);

    deleteRowAction->setEnabled(enableDel);

}

void Browser::about()

{

    QMessageBox::about(this, tr("About"), tr("The SQL Browser demonstration "

        "show how a data browser can be used to visualize the results of SQL"

        "statements on a live database"));

}