/************************************************************************
**
**  Copyright (C) 2009, 2010, 2011  Strahinja Markovic  <strahinja.markovic@gmail.com>
**
**  This file is part of Sigil.
**
**  Sigil is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  Sigil is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with Sigil.  If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/

#include "BookManipulation/CleanSource.h"
#include "BookManipulation/XhtmlDoc.h"
#include "Misc/Utility.h"
#include "ResourceObjects/XMLResource.h"


XMLResource::XMLResource(const QString &mainfolder, const QString &fullfilepath, QObject *parent)
    : TextResource(mainfolder, fullfilepath, parent)
{
}


Resource::ResourceType XMLResource::Type() const
{
    return Resource::XMLResourceType;
}


bool XMLResource::FileIsWellFormed() const
{
    // TODO: expand this with a dialog to fix the problem
    QReadLocker locker(&GetLock());
    XhtmlDoc::WellFormedError error = XhtmlDoc::WellFormedErrorForSource(GetText());
    bool well_formed = error.line == -1;
    return well_formed;
}


XhtmlDoc::WellFormedError XMLResource::WellFormedErrorLocation() const
{
    QReadLocker locker(&GetLock());
    return XhtmlDoc::WellFormedErrorForSource(GetText());
}


void XMLResource::UpdateTextFromDom(const xc::DOMDocument &document)
{
    QWriteLocker locker(&GetLock());
    SetText(CleanSource::ProcessXML(XhtmlDoc::GetDomDocumentAsString(document)));
}


QString XMLResource::GetValidID(const QString &value)
{
    QString new_value = value.simplified();
    int i = 0;

    // Remove all forbidden characters.
    while (i < new_value.size()) {
        if (!IsValidIDCharacter(new_value.at(i))) {
            new_value.replace(i, 1, "_");
        } else {
            ++i;
        }
    }

    if (new_value.isEmpty()) {
        return Utility::CreateUUID();
    }

    QChar first_char = new_value.at(0);

    // IDs cannot start with a number, a dash or a dot
    if (first_char.isNumber()      ||
        first_char == QChar('-') ||
        first_char == QChar('.')
       ) {
        new_value.prepend("x");
    }

    return new_value;
}


// This is probably more rigorous
// than the XML spec, but it's simpler.
// (spec ref: http://www.w3.org/TR/xml-id/#processing)
bool XMLResource::IsValidIDCharacter(const QChar &character)
{
    return character.isLetterOrNumber() ||
           character == QChar('-')    ||
           character == QChar('_')    ||
           character == QChar('.')
           ;
}

