/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

// krazy:excludeall=qclasses

#include "bookwindow.h"
#include "bookdelegate.h"
#include "bookwrapper.h"
#include "initdb.h"
#include "ktexttemplate_paths.h"

#include <QDataWidgetMapper>
#include <QInputDialog>
#include <QMessageBox>

#include <KTextTemplate/Context>
#include <KTextTemplate/Engine>
#include <KTextTemplate/FileSystemTemplateLoader>

BookWindow::BookWindow()
{
    ui.setupUi(this);

    if (!QSqlDatabase::drivers().contains("QSQLITE"))
        QMessageBox::critical(this, "Unable to load database", "This demo needs the SQLITE driver");

    // initialize the database
    QSqlError err = initDb();
    if (err.type() != QSqlError::NoError) {
        showError(err);
        return;
    }

    // Create the data model
    model = new QSqlRelationalTableModel(ui.bookTable);
    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model->setTable("books");

    // Rememeber the indexes of the columns
    authorIdx = model->fieldIndex("author");
    genreIdx = model->fieldIndex("genre");

    // Set the relations to the other database tables
    model->setRelation(authorIdx, QSqlRelation("authors", "id", "name"));
    model->setRelation(genreIdx, QSqlRelation("genres", "id", "name"));

    // Set the localized header captions
    model->setHeaderData(authorIdx, Qt::Horizontal, tr("Author Name"));
    model->setHeaderData(genreIdx, Qt::Horizontal, tr("Genre"));
    model->setHeaderData(model->fieldIndex("title"), Qt::Horizontal, tr("Title"));
    model->setHeaderData(model->fieldIndex("year"), Qt::Horizontal, tr("Year"));
    model->setHeaderData(model->fieldIndex("rating"), Qt::Horizontal, tr("Rating"));

    // Populate the model
    if (!model->select()) {
        showError(model->lastError());
        return;
    }

    // Set the model and hide the ID column
    ui.bookTable->setModel(model);
    ui.bookTable->setItemDelegate(new BookDelegate(ui.bookTable));
    ui.bookTable->setColumnHidden(model->fieldIndex("id"), true);
    ui.bookTable->setSelectionMode(QAbstractItemView::SingleSelection);

    // Initialize the Author combo box
    ui.authorEdit->setModel(model->relationModel(authorIdx));
    ui.authorEdit->setModelColumn(model->relationModel(authorIdx)->fieldIndex("name"));

    ui.genreEdit->setModel(model->relationModel(genreIdx));
    ui.genreEdit->setModelColumn(model->relationModel(genreIdx)->fieldIndex("name"));

    QDataWidgetMapper *mapper = new QDataWidgetMapper(this);
    mapper->setModel(model);
    mapper->setItemDelegate(new BookDelegate(this));
    mapper->addMapping(ui.titleEdit, model->fieldIndex("title"));
    mapper->addMapping(ui.yearEdit, model->fieldIndex("year"));
    mapper->addMapping(ui.authorEdit, authorIdx);
    mapper->addMapping(ui.genreEdit, genreIdx);
    mapper->addMapping(ui.ratingEdit, model->fieldIndex("rating"));

    connect(ui.bookTable->selectionModel(), SIGNAL(currentRowChanged(QModelIndex, QModelIndex)), mapper, SLOT(setCurrentModelIndex(QModelIndex)));

    ui.bookTable->setCurrentIndex(model->index(0, 0));

    ui.exportTheme->insertItems(0,
                                QStringList() << "simple"
                                              << "coloured"
                                              << "simple2"
                                              << "coloured2");

    connect(ui.exportButton, SIGNAL(pressed()), SLOT(renderBooks()));

    m_engine = new KTextTemplate::Engine();
    QSharedPointer<KTextTemplate::FileSystemTemplateLoader> loader =
        QSharedPointer<KTextTemplate::FileSystemTemplateLoader>(new KTextTemplate::FileSystemTemplateLoader());
    loader->setTemplateDirs(QStringList() << KTEXTTEMPLATE_TEMPLATE_PATH);
    m_engine->addTemplateLoader(loader);

    m_engine->setPluginPaths(QStringList() << KTEXTTEMPLATE_PLUGIN_PATH);
}

void BookWindow::showError(const QSqlError &err)
{
    QMessageBox::critical(this, "Unable to initialize Database", "Error initializing database: " + err.text());
}

void BookWindow::renderBooks() const
{
    int rows = model->rowCount();
    QVariantHash mapping;
    QVariantList bookList;
    for (int row = 0; row < rows; ++row) {
        QString title = model->index(row, 1).data().toString();
        QString author = model->index(row, 2).data().toString();
        QString genre = model->index(row, 3).data().toString();
        int rating = model->index(row, 5).data().toInt();
        QObject *book = new BookWrapper(author, title, genre, rating, const_cast<BookWindow *>(this));
        QVariant var = QVariant::fromValue(book);
        bookList.append(var);
    }
    mapping.insert("books", bookList);

    QString themeName = ui.exportTheme->currentText();

    KTextTemplate::Context c(mapping);

    KTextTemplate::Template t = m_engine->loadByName(themeName + ".html");
    if (!t) {
        QMessageBox::critical(const_cast<BookWindow *>(this), "Unable to load template", QString("Error loading template: %1").arg(themeName + ".html"));
        return;
    }

    if (t->error()) {
        QMessageBox::critical(const_cast<BookWindow *>(this), "Unable to load template", QString("Error loading template: %1").arg(t->errorString()));
        return;
    }

    bool ok;
    QString text = QInputDialog::getText(const_cast<BookWindow *>(this),
                                         tr("Export Location"),
                                         tr("file name:"),
                                         QLineEdit::Normal,
                                         QDir::home().absolutePath() + "/book_export.html",
                                         &ok);
    if (!ok || text.isEmpty())
        return;

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

    QString content = t->render(&c);

    if (t->error()) {
        QMessageBox::critical(const_cast<BookWindow *>(this), "Unable render template", QString("Error rendering template: %1").arg(t->errorString()));
        return;
    }

    file.write(content.toLocal8Bit());
    file.close();
}

#include "moc_bookwindow.cpp"
