/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include "attr.hxx"

#include <string.h>

#include <memory>

#include <libxml/entities.h>

#include <osl/diagnose.h>

#include <sal/log.hxx>

#include <com/sun/star/xml/dom/events/XMutationEvent.hpp>

#include "document.hxx"

using namespace css::uno;

using namespace css::xml::dom;

using namespace css::xml::dom::events;

namespace DOM

{

    CAttr::CAttr(CDocument const& rDocument, ::osl::Mutex const& rMutex,

            xmlAttrPtr const pAttr)

        : CAttr_Base(rDocument, rMutex,

                NodeType_ATTRIBUTE_NODE, reinterpret_cast<xmlNodePtr>(pAttr))

        , m_aAttrPtr(pAttr)

    {

    }

    xmlNsPtr CAttr::GetNamespace(xmlNodePtr const pNode)

    {

        if (!m_oNamespace)

        {

            return nullptr;

        }

        xmlChar const*const pUri(reinterpret_cast<xmlChar const*>(

                m_oNamespace->first.getStr()));

        xmlChar const*const pPrefix(reinterpret_cast<xmlChar const*>(

                m_oNamespace->second.getStr()));

        xmlNsPtr pNs = xmlSearchNs(pNode->doc, pNode, pPrefix);

        if (pNs && (0 != xmlStrcmp(pNs->href, pUri))) {

            return pNs;

        }

        pNs = xmlNewNs(pNode, pUri, pPrefix);

        if (pNs) {

            return pNs;

        }

        pNs = xmlSearchNsByHref(pNode->doc, pNode, pUri);

        // if (!pNs) hmm... now what? throw?

        if (!pNs) {

            SAL_WARN("unoxml", "CAttr: cannot create namespace");

        }

        return pNs;

    }

    bool CAttr::IsChildTypeAllowed(NodeType const nodeType, NodeType const*const)

    {

        switch (nodeType) {

            case NodeType_TEXT_NODE:

            case NodeType_ENTITY_REFERENCE_NODE:

                return true;

            default:

                return false;

        }

    }

    OUString SAL_CALL CAttr::getNodeName()

    {

        return getName();

    }

    OUString SAL_CALL CAttr::getNodeValue()

    {

        return getValue();

    }

    OUString SAL_CALL CAttr::getLocalName()

    {

        return getName();

    }

    /**

    Returns the name of this attribute.

    */

    OUString SAL_CALL CAttr::getName()

    {

        ::osl::MutexGuard const g(m_rMutex);

        if ((nullptr == m_aNodePtr) || (nullptr == m_aAttrPtr)) {

            return OUString();

        }

        OUString const aName(reinterpret_cast<char const *>(m_aAttrPtr->name),

                strlen(reinterpret_cast<char const *>(m_aAttrPtr->name)), RTL_TEXTENCODING_UTF8);

        return aName;

    }

    /**

    The Element node this attribute is attached to or null if this

    attribute is not in use.

    */

    Reference< XElement > SAL_CALL CAttr::getOwnerElement()

    {

        ::osl::MutexGuard const g(m_rMutex);

        if ((nullptr == m_aNodePtr) || (nullptr == m_aAttrPtr)) {

            return nullptr;

        }

        if (nullptr == m_aAttrPtr->parent) {

            return nullptr;

        }

        Reference< XElement > const xRet(

            static_cast< XNode* >(GetOwnerDocument().GetCNode(

                    m_aAttrPtr->parent).get()),

            UNO_QUERY_THROW);

        return xRet;

    }

    /**

    If this attribute was explicitly given a value in the original

    document, this is true; otherwise, it is false.

    */

    sal_Bool SAL_CALL CAttr::getSpecified()

    {

        // FIXME if this DOM implementation supported DTDs it would need

        // to check that this attribute is not default or something

        return true;

    }

    /**

    On retrieval, the value of the attribute is returned as a string.

    */

    OUString SAL_CALL CAttr::getValue()

    {

        ::osl::MutexGuard const g(m_rMutex);

        if ((nullptr == m_aNodePtr) || (nullptr == m_aAttrPtr)) {

            return OUString();

        }

        if (nullptr == m_aAttrPtr->children) {

            return OUString();

        }

        char const*const pContent(reinterpret_cast<char const*>(m_aAttrPtr->children->content));

        return OUString(pContent, strlen(pContent), RTL_TEXTENCODING_UTF8);

    }

    /**

    Sets the value of the attribute from a string.

    */

    void SAL_CALL CAttr::setValue(const OUString& value)

    {

        ::osl::ClearableMutexGuard guard(m_rMutex);

        if ((nullptr == m_aNodePtr) || (nullptr == m_aAttrPtr)) {

            return;

        }

        // remember old value (for mutation event)

        OUString sOldValue = getValue();

        OString o1 = OUStringToOString(value, RTL_TEXTENCODING_UTF8);

        xmlChar const * pValue = reinterpret_cast<xmlChar const *>(o1.getStr());

        // this does not work if the attribute was created anew

        // xmlNodePtr pNode = m_aAttrPtr->parent;

        // xmlSetProp(pNode, m_aAttrPtr->name, pValue);

        std::shared_ptr<xmlChar const> const buffer(

                xmlEncodeEntitiesReentrant(m_aAttrPtr->doc, pValue), xmlFree);

        xmlFreeNodeList(m_aAttrPtr->children);

        m_aAttrPtr->children =

            xmlStringGetNodeList(m_aAttrPtr->doc, buffer.get());

        xmlNodePtr tmp = m_aAttrPtr->children;

        while (tmp != nullptr) {

            tmp->parent = m_aNodePtr;

            tmp->doc = m_aAttrPtr->doc;

            if (tmp->next == nullptr)

                m_aNodePtr->last = tmp;

            tmp = tmp->next;

        }

        // dispatch DOM events to signal change in attribute value

        // dispatch DomAttrModified + DOMSubtreeModified

        OUString sEventName( u"DOMAttrModified"_ustr );

        Reference< XDocumentEvent > docevent(getOwnerDocument(), UNO_QUERY);

        Reference< XMutationEvent > event(docevent->createEvent(sEventName),UNO_QUERY);

        event->initMutationEvent(

                sEventName, true, false,

                Reference<XNode>( static_cast<XAttr*>( this ) ),

                sOldValue, value, getName(), AttrChangeType_MODIFICATION );

        guard.clear(); // release mutex before calling event handlers

        dispatchEvent(event);

        dispatchSubtreeModified();

    }

    void SAL_CALL CAttr::setPrefix(const OUString& prefix)

    {

        ::osl::MutexGuard const g(m_rMutex);

        if (!m_aNodePtr) { return; }

        if (m_oNamespace)

        {

            OSL_ASSERT(!m_aNodePtr->parent);

            m_oNamespace->second =

                OUStringToOString(prefix, RTL_TEXTENCODING_UTF8);

        }

        else

        {

            CNode::setPrefix(prefix);

        }

    }

    OUString SAL_CALL CAttr::getPrefix()

    {

        ::osl::MutexGuard const g(m_rMutex);

        if (!m_aNodePtr) { return OUString(); }

        if (m_oNamespace)

        {

            OSL_ASSERT(!m_aNodePtr->parent);

            OUString const ret(OStringToOUString(

                        m_oNamespace->second, RTL_TEXTENCODING_UTF8));

            return ret;

        }

        else

        {

            return CNode::getPrefix();

        }

    }

    OUString SAL_CALL CAttr::getNamespaceURI()

    {

        ::osl::MutexGuard const g(m_rMutex);

        if (!m_aNodePtr) { return OUString(); }

        if (m_oNamespace)

        {

            OSL_ASSERT(!m_aNodePtr->parent);

            OUString const ret(OStringToOUString(

                        m_oNamespace->first, RTL_TEXTENCODING_UTF8));

            return ret;

        }

        else

        {

            return CNode::getNamespaceURI();

        }

    }

}

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