/*
 * This file is part of the HTML rendering engine for KDE.
 *
 * Copyright (C) 2006 Apple Computer, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
*/

#include "config.h"
#include "HitTestResult.h"

#include "csshelper.h"
#include "Document.h"
#include "Frame.h"
#include "FrameTree.h"
#include "HTMLAnchorElement.h"
#include "HTMLElement.h"
#include "HTMLImageElement.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "KURL.h"
#include "PlatformScrollBar.h"
#include "RenderObject.h"
#include "RenderImage.h"
#include "SelectionController.h"

namespace WebCore {

using namespace HTMLNames;

HitTestResult::HitTestResult(const IntPoint& point)
    : m_point(point)
{
}

HitTestResult::HitTestResult(const HitTestResult& other)
    : m_innerNode(other.innerNode())
    , m_innerNonSharedNode(other.innerNonSharedNode())
    , m_point(other.point())
    , m_innerURLElement(other.URLElement())
    , m_scrollbar(other.scrollbar())
{
}

HitTestResult::~HitTestResult()
{
}

HitTestResult& HitTestResult::operator=(const HitTestResult& other)
{
    m_innerNode = other.innerNode();
    m_innerNonSharedNode = other.innerNonSharedNode();
    m_point = other.point();
    m_innerURLElement = other.URLElement();
    m_scrollbar = other.scrollbar();
    return *this;
}

void HitTestResult::setInnerNode(Node* n)
{
    m_innerNode = n;
}
    
void HitTestResult::setInnerNonSharedNode(Node* n)
{
    m_innerNonSharedNode = n;
}

void HitTestResult::setURLElement(Element* n) 
{ 
    m_innerURLElement = n; 
}

void HitTestResult::setScrollbar(PlatformScrollbar* s)
{
    m_scrollbar = s;
}

Frame* HitTestResult::targetFrame() const
{
    if (!m_innerURLElement)
        return 0;

    Frame* frame = m_innerURLElement->document()->frame();
    if (!frame)
        return 0;

    return frame->tree()->find(m_innerURLElement->target());
}

IntRect HitTestResult::boundingBox() const
{
    if (m_innerNonSharedNode) {
        RenderObject* renderer = m_innerNonSharedNode->renderer();
        if (renderer)
            return renderer->absoluteBoundingBoxRect();
    }
    
    return IntRect();
}

bool HitTestResult::isSelected() const
{
    if (!m_innerNonSharedNode)
        return false;

    Frame* frame = m_innerNonSharedNode->document()->frame();
    if (!frame)
        return false;

    return frame->selectionController()->contains(m_point);
}

String HitTestResult::spellingToolTip() const
{
    // Return the tool tip string associated with this point, if any. Only markers associated with bad grammar
    // currently supply strings, but maybe someday markers associated with misspelled words will also.
    DocumentMarker* marker = m_innerNonSharedNode->document()->markerContainingPoint(m_point, DocumentMarker::Grammar);
    if (marker)
        return marker->description;
    
    return String();
}

String HitTestResult::title() const
{
    // Find the title in the nearest enclosing DOM node.
    // For <area> tags in image maps, walk the tree for the <area>, not the <img> using it.
    for (Node* titleNode = m_innerNode.get(); titleNode; titleNode = titleNode->parentNode()) {
        if (titleNode->isHTMLElement()) {
            HTMLElement* titleHTMLNode = static_cast<HTMLElement*>(titleNode);
            String title = titleHTMLNode->title();
            if (!title.isEmpty())
                return title;
        }
    }
    return String();
}

static String displayString(const String& string, const Node* node)
{
    if (!node)
        return string;
    Document* document = node->document();
    if (!document)
        return string;
    String copy(string);
    copy.replace('\\', document->backslashAsCurrencySymbol());
    return copy;
}

String HitTestResult::altDisplayString() const
{
    if (!m_innerNonSharedNode)
        return String();
    
    if (m_innerNonSharedNode->hasTagName(imgTag)) {
        HTMLImageElement* image = static_cast<HTMLImageElement*>(m_innerNonSharedNode.get());
        return displayString(image->alt(), m_innerNonSharedNode.get());
    }
    
    if (m_innerNonSharedNode->hasTagName(inputTag)) {
        HTMLInputElement* input = static_cast<HTMLInputElement*>(m_innerNonSharedNode.get());
        return displayString(input->alt(), m_innerNonSharedNode.get());
    }
    
    return String();
}

Image* HitTestResult::image() const
{
    if (!m_innerNonSharedNode)
        return 0;
    
    RenderObject* renderer = m_innerNonSharedNode->renderer();
    if (renderer && renderer->isImage()) {
        RenderImage* image = static_cast<WebCore::RenderImage*>(renderer);
        if (image->cachedImage() && !image->cachedImage()->isErrorImage())
            return image->cachedImage()->image();
    }

    return 0;
}

KURL HitTestResult::absoluteImageURL() const
{
    if (!(m_innerNonSharedNode && m_innerNonSharedNode->document()))
        return KURL();

    if (!(m_innerNonSharedNode->renderer() && m_innerNonSharedNode->renderer()->isImage()))
        return KURL();

    String name;
    if (m_innerNonSharedNode->hasTagName(imgTag) || m_innerNonSharedNode->hasTagName(inputTag))
        name = "src";
    else if (m_innerNonSharedNode->hasTagName(objectTag))
        name = "data";
    else
        return KURL();
    
    return KURL(m_innerNonSharedNode->document()->completeURL(parseURL(
        static_cast<Element*>(m_innerNonSharedNode.get())->getAttribute(name)).deprecatedString()));
}

KURL HitTestResult::absoluteLinkURL() const
{
    if (!(m_innerURLElement && m_innerURLElement->document()))
        return KURL();

    if (!(m_innerURLElement->hasTagName(aTag) || m_innerURLElement->hasTagName(areaTag)
            || m_innerURLElement->hasTagName(linkTag)))
        return KURL();

    return KURL(m_innerURLElement->document()->completeURL(parseURL(
        static_cast<Element*>(m_innerURLElement.get())->getAttribute("href")).deprecatedString()));
}

bool HitTestResult::isLiveLink() const
{
    if (!(m_innerURLElement && m_innerURLElement->document()))
        return false;

    if (!m_innerURLElement->hasTagName(aTag))
        return false;

    return static_cast<HTMLAnchorElement*>(m_innerURLElement.get())->isLiveLink();
}

String HitTestResult::titleDisplayString() const
{
    if (!(m_innerURLElement && m_innerURLElement->isHTMLElement()))
        return String();

    HTMLElement* element = static_cast<HTMLElement*>(m_innerURLElement.get());
    return displayString(element->title(), element);
}

String HitTestResult::textContent() const
{
    if (!m_innerURLElement)
        return String();
    return m_innerURLElement->textContent();
}

} // namespace WebCore