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**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** This file is part of Qt Creator.
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** 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
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****************************************************************************/

#include "formwindowfile.h"
#include "designerconstants.h"

#include <utils/qtcassert.h>

#include <QApplication>
#include <QDesignerFormWindowInterface>
#include <QDesignerFormWindowManagerInterface>
#include <QDesignerFormEditorInterface>
#if QT_VERSION < 0x050000
#    include "qt_private/qsimpleresource_p.h"
#    include "qt_private/formwindowbase_p.h"
#endif

#include <QTextDocument>
#include <QUndoStack>

#include <QFileInfo>
#include <QDebug>
#include <QTextCodec>

namespace Designer {
namespace Internal {

FormWindowFile::FormWindowFile(QDesignerFormWindowInterface *form, QObject *parent)
  : m_shouldAutoSave(false),
    m_formWindow(form),
    m_isModified(false)
{
    setMimeType(QLatin1String(Designer::Constants::FORM_MIMETYPE));
    setParent(parent);
    setId(Core::Id(Designer::Constants::K_DESIGNER_XML_EDITOR_ID));
    // Designer needs UTF-8 regardless of settings.
    setCodec(QTextCodec::codecForName("UTF-8"));
    connect(m_formWindow->core()->formWindowManager(), SIGNAL(formWindowRemoved(QDesignerFormWindowInterface*)),
            this, SLOT(slotFormWindowRemoved(QDesignerFormWindowInterface*)));
    connect(m_formWindow->commandHistory(), SIGNAL(indexChanged(int)),
            this, SLOT(setShouldAutoSave()));
    connect(m_formWindow, SIGNAL(changed()), SLOT(updateIsModified()));
}

bool FormWindowFile::save(QString *errorString, const QString &name, bool autoSave)
{
    const QString actualName = name.isEmpty() ? filePath() : name;

    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << name << "->" << actualName;

    QTC_ASSERT(m_formWindow, return false);

    if (actualName.isEmpty())
        return false;

    const QFileInfo fi(actualName);
    const QString oldFormName = m_formWindow->fileName();
    if (!autoSave)
        m_formWindow->setFileName(fi.absoluteFilePath());
#if QT_VERSION >= 0x050000
    const bool writeOK = writeFile(actualName, errorString);
#else
    const bool warningsEnabled = qdesigner_internal::QSimpleResource::setWarningsEnabled(false);
    const bool writeOK = writeFile(actualName, errorString);
    qdesigner_internal::QSimpleResource::setWarningsEnabled(warningsEnabled);
#endif
    m_shouldAutoSave = false;
    if (autoSave)
        return writeOK;

    if (!writeOK) {
        m_formWindow->setFileName(oldFormName);
        return false;
    }

    m_formWindow->setDirty(false);
    setFilePath(fi.absoluteFilePath());
    emit changed();

    return true;
}

bool FormWindowFile::setContents(const QByteArray &contents)
{
    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << contents.size();

    document()->setPlainText(QString());

    QTC_ASSERT(m_formWindow, return false);

    if (contents.isEmpty())
        return false;

    // If we have an override cursor, reset it over Designer loading,
    // should it pop up messages about missing resources or such.
    const bool hasOverrideCursor = QApplication::overrideCursor();
    QCursor overrideCursor;
    if (hasOverrideCursor) {
        overrideCursor = QCursor(*QApplication::overrideCursor());
        QApplication::restoreOverrideCursor();
    }

#if QT_VERSION >= 0x050000
    const bool success = m_formWindow->setContents(QString::fromUtf8(contents));
#else
    m_formWindow->setContents(QString::fromUtf8(contents));
    const bool success = m_formWindow->mainContainer() != 0;
#endif

    if (hasOverrideCursor)
        QApplication::setOverrideCursor(overrideCursor);

    if (!success)
        return false;

    syncXmlFromFormWindow();
    setShouldAutoSave(false);
    return true;
}

void FormWindowFile::setFilePath(const QString &newName)
{
    m_formWindow->setFileName(newName);
    IDocument::setFilePath(newName);
}

void FormWindowFile::updateIsModified()
{
    bool value = m_formWindow && m_formWindow->isDirty();
    if (value == m_isModified)
        return;
    m_isModified = value;
    emit changed();
}

bool FormWindowFile::shouldAutoSave() const
{
    return m_shouldAutoSave;
}

bool FormWindowFile::isModified() const
{
    return m_formWindow && m_formWindow->isDirty();
}

bool FormWindowFile::isSaveAsAllowed() const
{
    return true;
}

bool FormWindowFile::reload(QString *errorString, ReloadFlag flag, ChangeType type)
{
    if (flag == FlagIgnore)
        return true;
    if (type == TypePermissions) {
        emit changed();
    } else {
        emit aboutToReload();
        emit reloadRequested(errorString, filePath());
        const bool success = errorString->isEmpty();
        emit reloadFinished(success);
        return success;
    }
    return true;
}

QString FormWindowFile::defaultPath() const
{
    return QString();
}

void FormWindowFile::setSuggestedFileName(const QString &fn)
{
    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << filePath() << fn;

    m_suggestedName = fn;
}

QString FormWindowFile::suggestedFileName() const
{
    return m_suggestedName;
}

bool FormWindowFile::writeFile(const QString &fn, QString *errorString) const
{
    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << filePath() << fn;
    return write(fn, format(), m_formWindow->contents(), errorString);
}

QDesignerFormWindowInterface *FormWindowFile::formWindow() const
{
    return m_formWindow;
}

void FormWindowFile::syncXmlFromFormWindow()
{
    document()->setPlainText(formWindowContents());
}

QString FormWindowFile::formWindowContents() const
{
#if QT_VERSION >= 0x050000    // TODO: No warnings about spacers here
    QTC_ASSERT(m_formWindow, return QString());
    return m_formWindow->contents();
#else
    // No warnings about spacers here
    const qdesigner_internal::FormWindowBase *fw =
            qobject_cast<const qdesigner_internal::FormWindowBase *>(m_formWindow);
    QTC_ASSERT(fw, return QString());
    return fw->fileContents();
#endif
}

void FormWindowFile::slotFormWindowRemoved(QDesignerFormWindowInterface *w)
{
    // Release formwindow as soon as the FormWindowManager removes
    // as calls to isDirty() are triggered at arbitrary times
    // while building.
    if (w == m_formWindow)
        m_formWindow = 0;
}

} // namespace Internal
} // namespace Designer