// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qversitresourcehandler.h"

#include <QtCore/qbytearray.h>
#include <QtCore/qfile.h>
#include <QtCore/qstring.h>

#include "qversitdefs_p.h"
#include "qversitproperty.h"

QT_BEGIN_NAMESPACE_VERSIT

// Out-of-line destructor to anchor the vtable (avoids -Wweak-vtables).
QVersitResourceHandler::~QVersitResourceHandler() = default;

/*!
  \class QVersitResourceHandler
  \brief The QVersitResourceHandler class is an interface for clients wishing to implement custom
  behaviour for loading and saving files to disk when exporting and importing.
  \ingroup versit-extension
  \inmodule QtVersit

  \sa QVersitContactImporter
  \sa QVersitContactExporter
  \sa QVersitDefaultResourceHandler
 */

/*!
  \fn virtual QVersitResourceHandler::~QVersitResourceHandler()
  Frees any memory used by the handler.
 */

/*!
  \fn virtual bool QVersitResourceHandler::saveResource(const QByteArray& contents, const QVersitProperty& property, QString* location) = 0;
  Saves the binary data \a contents to a file on a persistent storage medium.

  \a property holds the QVersitProperty which is the context in which the binary is coming from.
  The QVersitResourceHandler can use this, for example, to determine file extension it should choose.
  *\a location is filled with the contents of the file.
  Returns true on success, false on failure.
 */

/*!
 \fn virtual bool QVersitResourceHandler::loadResource(const QString& location, QByteArray* contents, QString* mimeType) = 0
 Loads a file from \a location.
 *\a contents is filled with the contents of the file and *\a mimeType is set to the MIME
 type that it is determined to be.
 Returns true on success, false on failure.
*/

/*!
  \class QVersitDefaultResourceHandler

  \brief The QVersitDefaultResourceHandler class provides a default implementation of a Versit
  resource handler.
  \ingroup versit-extension

  An example resource handler implementation:
  \snippet qtversitdocsample/qtversitdocsample.cpp Resource handler

  \sa QVersitContactImporter, QVersitContactExporter, QVersitResourceHandler
 */

class QVersitDefaultResourceHandlerPrivate {
public:
    QMap<QString,QString> mFileExtensionMapping;
};

/*!
  Constructs a QVersitDefaultResourceHandler.
 */
QVersitDefaultResourceHandler::QVersitDefaultResourceHandler()
    : d(new QVersitDefaultResourceHandlerPrivate)
{
    // File extension mappings
    int fileExtensionCount = sizeof(versitFileExtensionMappings)/sizeof(VersitFileExtensionMapping);
    for (int i = 0; i < fileExtensionCount; i++) {
        d->mFileExtensionMapping.insert(
            QLatin1String(versitFileExtensionMappings[i].extension),
            QLatin1String(versitFileExtensionMappings[i].mimeType));
    }
}

/*!
  Frees any memory used by the resource handler.
 */
QVersitDefaultResourceHandler::~QVersitDefaultResourceHandler()
{
    delete d;
}

/*!
  Default resource loader.
  Loads file from given \a location into \a contents and returns true if successful.
  Sets the \a mimeType based on the file extension.
 */
bool QVersitDefaultResourceHandler::loadResource(const QString& location,
                                                 QByteArray* contents,
                                                 QString* mimeType)
{
    QString extension = location.split(QLatin1Char('.')).last().toLower();
    *mimeType = d->mFileExtensionMapping.value(extension);
    if (location.isEmpty())
        return false;
    QFile file(location);
    if (!file.open(QIODevice::ReadOnly))
        return false;
    if (!file.isReadable())
        return false;
    *contents = file.readAll();
    return contents->size() > 0;
}

/*!
  Default resource saver.
  Does nothing and returns false, ignoring \a contents, \a property and \a location.  By default,
  resources aren't persisted because we don't know when it is safe to remove them.
 */
bool QVersitDefaultResourceHandler::saveResource(const QByteArray& contents,
                                                 const QVersitProperty& property,
                                                 QString* location)
{
    Q_UNUSED(contents)
    Q_UNUSED(property)
    Q_UNUSED(location)
    return false;
}

QT_END_NAMESPACE_VERSIT
