// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "textdocument.h"

#include "editormanager/editormanager.h"

#include <QDebug>

/*!
    \class Core::BaseTextDocument
    \inheaderfile coreplugin/textdocument.h
    \inmodule QtCreator

    \brief The BaseTextDocument class is a very general base class for
    documents that work with text.

    This class contains helper methods for saving and reading text files with encoding and
    line ending settings.

    \sa Utils::TextFileFormat
*/

enum { debug = 0 };

using namespace Utils;

namespace Core {

namespace Internal {

class TextDocumentPrivate
{
public:
    TextFileFormat m_format;
    bool m_supportsUtf8Bom = true;
    bool m_hasDecodingError = false;
    QByteArray m_decodingErrorSample;

};

} // namespace Internal

BaseTextDocument::BaseTextDocument(QObject *parent)
    : IDocument(parent), d(new Internal::TextDocumentPrivate)
{
    setEncoding(Core::EditorManager::defaultTextEncoding());
    setLineTerminationMode(Core::EditorManager::defaultLineEnding());
}

BaseTextDocument::~BaseTextDocument()
{
    delete d;
}

bool BaseTextDocument::hasDecodingError() const
{
    return d->m_hasDecodingError;
}

QByteArray BaseTextDocument::decodingErrorSample() const
{
    return d->m_decodingErrorSample;
}

/*!
    Writes out the contents (\a data) of the text file \a filePath.
    Uses the format obtained from the last read() of the file.

    Returns whether the operation was successful.
*/

Result<> BaseTextDocument::write(const FilePath &filePath, const QString &data) const
{
    return write(filePath, format(), data);
}

/*!
    Writes out the contents (\a data) of the text file \a filePath.
    Uses the custom format \a format.

    Returns whether the operation was successful.
*/

Result<> BaseTextDocument::write(const FilePath &filePath,
                               const TextFileFormat &format,
                               const QString &data) const
{
    if (debug)
        qDebug() << Q_FUNC_INFO << this << filePath;
    return format.writeFile(filePath, data);
}

void BaseTextDocument::setSupportsUtf8Bom(bool value)
{
    d->m_supportsUtf8Bom = value;
}

void BaseTextDocument::setLineTerminationMode(TextFileFormat::LineTerminationMode mode)
{
    d->m_format.lineTerminationMode = mode;
}

/*!
    Autodetects file format and reads the text file specified by \a filePath.

    Returns whether the operation was successful.
*/

BaseTextDocument::ReadResult BaseTextDocument::read(const FilePath &filePath)
{
    ReadResult res = d->m_format.readFile(filePath, encoding());
    d->m_hasDecodingError = res.code == TextFileFormat::ReadEncodingError;
    d->m_decodingErrorSample = res.decodingErrorSample;
    return res;
}

void BaseTextDocument::setEncoding(const TextEncoding &encoding)
{
    if (debug)
        qDebug() << Q_FUNC_INFO << this << encoding.name();
    if (supportsEncoding(encoding))
        d->m_format.setEncoding(encoding);
}

TextEncoding BaseTextDocument::encoding() const
{
    return d->m_format.encoding();
}

bool BaseTextDocument::supportsEncoding(const TextEncoding &) const
{
    return true;
}

void BaseTextDocument::switchUtf8Bom()
{
    if (debug)
        qDebug() << Q_FUNC_INFO << this << "UTF-8 BOM: " << !d->m_format.hasUtf8Bom;
    d->m_format.hasUtf8Bom = !d->m_format.hasUtf8Bom;
}

bool BaseTextDocument::supportsUtf8Bom() const
{
    return d->m_supportsUtf8Bom;
}

TextFileFormat::LineTerminationMode BaseTextDocument::lineTerminationMode() const
{
    return d->m_format.lineTerminationMode;
}

/*!
    Returns the format obtained from the last call to read().
*/

TextFileFormat BaseTextDocument::format() const
{
    return d->m_format;
}

} // namespace Core