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#include "bookwindow.h"

#include "bookdelegate.h"

#include "initdb.h"

#include <QtSql>

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");

    // Remeber 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));

}

void BookWindow::showError(const QSqlError &err)

{

    QMessageBox::critical(this, "Unable to initialize Database",

                "Error initializing database: " + err.text());

}