/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2003 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2002 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., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */
// -------------------------------------------------------------------------
//#define DEBUG
//#define DEBUG_LAYOUT
//#define PAR_DEBUG
//#define EVENT_DEBUG
//#define UNSUPPORTED_ATTR

#include "html_elementimpl.h"
#include "dtd.h"
#include "html_documentimpl.h"
#include "htmltokenizer.h"

#include <khtmlview.h>
#include <khtml_part.h>

#include <rendering/render_object.h>
#include <rendering/render_replaced.h>
#include <css/css_valueimpl.h>
#include <css/css_stylesheetimpl.h>
#include <css/cssproperties.h>
#include <css/cssvalues.h>
#include <xml/dom_textimpl.h>
#include <xml/dom2_eventsimpl.h>
#include <dom/dom_doc.h>

#include <QDebug>

using namespace DOM;
using namespace khtml;

HTMLElementImpl::HTMLElementImpl(DocumentImpl *doc)
    : ElementImpl(doc)
{
    m_htmlCompat = doc && doc->htmlMode() != DocumentImpl::XHtml;
}

HTMLElementImpl::~HTMLElementImpl()
{
}

bool HTMLElementImpl::isInline() const
{
    if (renderer()) {
        return ElementImpl::isInline();
    }

    switch (id()) {
    case ID_A:
    case ID_FONT:
    case ID_TT:
    case ID_U:
    case ID_B:
    case ID_I:
    case ID_S:
    case ID_STRIKE:
    case ID_BIG:
    case ID_SMALL:

    // %phrase
    case ID_EM:
    case ID_STRONG:
    case ID_DFN:
    case ID_CODE:
    case ID_SAMP:
    case ID_KBD:
    case ID_VAR:
    case ID_CITE:
    case ID_ABBR:
    case ID_ACRONYM:

    // %special
    case ID_SUB:
    case ID_SUP:
    case ID_SPAN:
    case ID_NOBR:
    case ID_WBR:
        return true;

    default:
        return ElementImpl::isInline();
    }
}

DOMString HTMLElementImpl::namespaceURI() const
{
    return DOMString(XHTML_NAMESPACE);
}

void HTMLElementImpl::parseAttribute(AttributeImpl *attr)
{
    DOMString indexstring;
    switch (attr->id()) {
    case ATTR_ALIGN:
        if (attr->val()) {
            if (strcasecmp(attr->value(), "middle") == 0) {
                addCSSProperty(CSS_PROP_TEXT_ALIGN, CSS_VAL_CENTER);
            } else {
                addCSSProperty(CSS_PROP_TEXT_ALIGN, attr->value().lower());
            }
        } else {
            removeCSSProperty(CSS_PROP_TEXT_ALIGN);
        }
        break;
// the core attributes...
    case ATTR_ID:
        // unique id
        setHasID();
        document()->incDOMTreeVersion(DocumentImpl::TV_IDNameHref);
        break;
    case ATTR_CLASS:
        if (attr->val()) {
            DOMString v = attr->value();
            const QChar *characters = v.unicode();
            unsigned length = v.length();
            unsigned i;
            for (i = 0; i < length && characters[i].isSpace(); ++i) { }
            setHasClass(i < length);
            attributes()->setClass(v);
        } else {
            setHasClass(false);
        }
        document()->incDOMTreeVersion(DocumentImpl::TV_Class);
        break;
    case ATTR_NAME:
        document()->incDOMTreeVersion(DocumentImpl::TV_IDNameHref);
        break;
    case ATTR_CONTENTEDITABLE:
        setContentEditable(attr);
        break;
    case ATTR_STYLE:
        getInlineStyleDecls()->updateFromAttribute(attr->value());
        setChanged();
        break;
    case ATTR_TABINDEX:
        indexstring = getAttribute(ATTR_TABINDEX);
        if (attr->val()) {
            setTabIndex(attr->value().toInt());
        } else {
            setNoTabIndex();
        }
        break;
// i18n attributes
    case ATTR_LANG:
        break;
    case ATTR_DIR:
        addCSSProperty(CSS_PROP_DIRECTION, attr->value().lower());
        break;
// standard events
    case ATTR_ONCLICK:
        setHTMLEventListener(EventImpl::KHTML_ECMA_CLICK_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onclick", this));
        break;
    case ATTR_ONDBLCLICK:
        setHTMLEventListener(EventImpl::KHTML_ECMA_DBLCLICK_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "ondblclick", this));
        break;
    case ATTR_ONMOUSEDOWN:
        setHTMLEventListener(EventImpl::MOUSEDOWN_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onmousedown", this));
        break;
    case ATTR_ONMOUSEMOVE:
        setHTMLEventListener(EventImpl::MOUSEMOVE_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onmousemove", this));
        break;
    case ATTR_ONMOUSEOUT:
        setHTMLEventListener(EventImpl::MOUSEOUT_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onmouseout", this));
        break;
    case ATTR_ONMOUSEOVER:
        setHTMLEventListener(EventImpl::MOUSEOVER_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onmouseover", this));
        break;
    case ATTR_ONMOUSEUP:
        setHTMLEventListener(EventImpl::MOUSEUP_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onmouseup", this));
        break;
    case ATTR_ONKEYDOWN:
        setHTMLEventListener(EventImpl::KEYDOWN_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onkeydown", this));
        break;
    case ATTR_ONKEYPRESS:
        setHTMLEventListener(EventImpl::KEYPRESS_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onkeypress", this));
        break;
    case ATTR_ONKEYUP:
        setHTMLEventListener(EventImpl::KEYUP_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onkeyup", this));
        break;
    case ATTR_ONFOCUS:
        setHTMLEventListener(EventImpl::FOCUS_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onfocus", this));
        break;
    case ATTR_ONBLUR:
        setHTMLEventListener(EventImpl::BLUR_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onblur", this));
        break;
    case ATTR_ONSCROLL:
        setHTMLEventListener(EventImpl::SCROLL_EVENT,
                             document()->createHTMLEventListener(attr->value().string(), "onscroll", this));
        break;
// other misc attributes
    default:
#ifdef UNSUPPORTED_ATTR
        qDebug() << "UATTR: <" << this->nodeName().string() << "> ["
                 << attr->name().string() << "]=[" << attr->value().string() << "]" << endl;
#endif
        break;
    }
}

void HTMLElementImpl::recalcStyle(StyleChange ch)
{
    ElementImpl::recalcStyle(ch);

    if (m_render /*&& changed*/) {
        m_render->updateFromElement();
    }
}

void HTMLElementImpl::addCSSProperty(int id, const DOMString &value)
{
    if (!m_hasCombinedStyle) {
        createNonCSSDecl();
    }
    nonCSSStyleDecls()->setProperty(id, value, false);
    setChanged();
}

void HTMLElementImpl::addCSSProperty(int id, int value)
{
    if (!m_hasCombinedStyle) {
        createNonCSSDecl();
    }
    nonCSSStyleDecls()->setProperty(id, value, false);
    setChanged();
}

void HTMLElementImpl::addCSSLength(int id, const DOMString &value, bool numOnly, bool multiLength)
{
    if (!m_hasCombinedStyle) {
        createNonCSSDecl();
    }

    // strip attribute garbage to avoid CSS parsing errors
    // ### create specialized hook that avoids parsing every
    // value twice!
    if (value.implementation()) {
        // match \s*[+-]?\d*(\.\d*)?[%\*]?
        unsigned i = 0, j = 0;
        QChar *s = value.implementation()->s;
        unsigned l = value.implementation()->l;

        while (i < l && s[i].isSpace()) {
            ++i;
        }
        if (i < l && (s[i] == '+' || s[i] == '-')) {
            ++i;
        }
        while (i < l && s[i].isDigit()) {
            ++i, ++j;
        }

        // no digits!
        if (j == 0) {
            return;
        }

        int v = qBound(-8192, QString::fromRawData(s, i).toInt(), 8191);
        const char *suffix = "px";
        if (!numOnly || multiLength) {
            // look if we find a % or *
            while (i < l) {
                if (multiLength && s[i] == '*') {
                    suffix = "";
                    break;
                }
                if (s[i] == '%') {
                    suffix = "%";
                    break;
                }
                ++i;
            }
        }
        if (numOnly) {
            suffix = "";
        }

        QString ns = QString::number(v) + suffix;
        nonCSSStyleDecls()->setLengthProperty(id, DOMString(ns), false, multiLength);
        setChanged();
        return;
    }

    nonCSSStyleDecls()->setLengthProperty(id, value, false, multiLength);
    setChanged();
}

static inline bool isHexDigit(const QChar &c)
{
    return (c >= '0' && c <= '9') ||
           (c >= 'a' && c <= 'f') ||
           (c >= 'A' && c <= 'F');
}

static inline int toHex(const QChar &c)
{
    return ((c >= '0' && c <= '9')
            ? (c.unicode() - '0')
            : ((c >= 'a' && c <= 'f')
               ? (c.unicode() - 'a' + 10)
               : ((c >= 'A' && c <= 'F')
                  ? (c.unicode() - 'A' + 10)
                  : -1)));
}

/* color parsing that tries to match as close as possible IE 6. */
void HTMLElementImpl::addHTMLColor(int id, const DOMString &c)
{
    if (!m_hasCombinedStyle) {
        createNonCSSDecl();
    }

    // this is the only case no color gets applied in IE.
    if (!c.length()) {
        removeCSSProperty(id);
        return;
    }

    if (nonCSSStyleDecls()->setProperty(id, c, false)) {
        return;
    }

    QString color = c.string();
    // not something that fits the specs.

    // we're emulating IEs color parser here. It maps transparent to black, otherwise it tries to build a rgb value
    // out of everyhting you put in. The algorithm is experimentally determined, but seems to work for all test cases I have.

    // the length of the color value is rounded up to the next
    // multiple of 3. each part of the rgb triple then gets one third
    // of the length.
    //
    // Each triplet is parsed byte by byte, mapping
    // each number to a hex value (0-9a-fA-F to their values
    // everything else to 0).
    //
    // The highest non zero digit in all triplets is remembered, and
    // used as a normalization point to normalize to values between 0
    // and 255.

    if (color.toLower() != "transparent") {
        if (color[0] == '#') {
            color.remove(0,  1);
        }
        int basicLength = (color.length() + 2) / 3;
        if (basicLength > 1) {
            // IE ignores colors with three digits or less
//      qDebug("trying to fix up color '%s'. basicLength=%d, length=%d",
//         color.toLatin1().constData(), basicLength, color.length() );
            int colors[3] = { 0, 0, 0 };
            int component = 0;
            int pos = 0;
            int maxDigit = basicLength - 1;
            while (component < 3) {
                // search forward for digits in the string
                int numDigits = 0;
                while (pos < (int)color.length() && numDigits < basicLength) {
                    int hex = toHex(color[pos]);
                    colors[component] = (colors[component] << 4);
                    if (hex > 0) {
                        colors[component] += hex;
                        maxDigit = qMin(maxDigit, numDigits);
                    }
                    numDigits++;
                    pos++;
                }
                while (numDigits++ < basicLength) {
                    colors[component] <<= 4;
                }
                component++;
            }
            maxDigit = basicLength - maxDigit;
//      qDebug("color is %x %x %x, maxDigit=%d",  colors[0], colors[1], colors[2], maxDigit );

            // normalize to 00-ff. The highest filled digit counts, minimum is 2 digits
            maxDigit -= 2;
            colors[0] >>= 4 * maxDigit;
            colors[1] >>= 4 * maxDigit;
            colors[2] >>= 4 * maxDigit;
//      qDebug("normalized color is %x %x %x",  colors[0], colors[1], colors[2] );
            //  assert( colors[0] < 0x100 && colors[1] < 0x100 && colors[2] < 0x100 );

            color.sprintf("#%02x%02x%02x", colors[0], colors[1], colors[2]);
//      qDebug( "trying to add fixed color string '%s'", color.toLatin1().constData() );
            if (nonCSSStyleDecls()->setProperty(id, DOMString(color), false)) {
                return;
            }
        }
    }
    nonCSSStyleDecls()->setProperty(id, CSS_VAL_BLACK, false);
}

void HTMLElementImpl::removeCSSProperty(int id)
{
    if (!m_hasCombinedStyle) {
        return;
    }
    nonCSSStyleDecls()->setParent(document()->elementSheet());
    nonCSSStyleDecls()->removeProperty(id);
    setChanged();
}

DOMString HTMLElementImpl::innerHTML() const
{
    QString result = ""; //Use QString to accumulate since DOMString is poor for appends
    for (NodeImpl *child = firstChild(); child != NULL; child = child->nextSibling()) {
        DOMString kid = child->toString();
        result += QString::fromRawData(kid.unicode(), kid.length());
    }
    return result;
}

DOMString HTMLElementImpl::innerText() const
{
    QString text = "";
    if (!firstChild()) {
        return text;
    }

    const NodeImpl *n = this;
    // find the next text/image after the anchor, to get a position
    while (n) {
        if (n->firstChild()) {
            n = n->firstChild();
        } else if (n->nextSibling()) {
            n = n->nextSibling();
        } else {
            NodeImpl *next = 0;
            while (!next) {
                n = n->parentNode();
                if (!n || n == (NodeImpl *)this) {
                    goto end;
                }
                next = n->nextSibling();
            }
            n = next;
        }
        if (n->isTextNode()) {
            DOMStringImpl *data = static_cast<const TextImpl *>(n)->string();
            text += QString::fromRawData(data->s, data->l);
        }
    }
end:
    return text;
}

DocumentFragment HTMLElementImpl::createContextualFragment(const DOMString &html)
{
    // IE originally restricted innerHTML to a small subset of elements;
    // and we largely matched that. Mozilla's embrace of innerHTML, however, extended
    // it to pretty much everything, and so the web (and HTML5) requires it now.
    // For now, we accept everything, but do not do context-based recovery in the parser.
    if (!document()->isHTMLDocument()) {
        return DocumentFragment();
    }

    DocumentFragmentImpl *fragment = new DocumentFragmentImpl(docPtr());
    DocumentFragment f(fragment);
    {
        HTMLTokenizer tok(docPtr(), fragment);
        tok.begin();
        tok.write(html.string(), true);
        tok.end();
    }

    // Exceptions are ignored because none ought to happen here.
    int ignoredExceptionCode;

    // we need to pop <html> and <body> elements and remove <head> to
    // accomadate folks passing complete HTML documents to make the
    // child of an element.
    for (NodeImpl *node = fragment->firstChild(); node;) {
        if (node->id() == ID_HTML || node->id() == ID_BODY) {
            NodeImpl *firstChild = node->firstChild();
            NodeImpl *child = firstChild;
            while (child) {
                NodeImpl *nextChild = child->nextSibling();
                fragment->insertBefore(child, node, ignoredExceptionCode);
                child = nextChild;
            }
            if (!firstChild) {
                NodeImpl *nextNode = node->nextSibling();
                fragment->removeChild(node, ignoredExceptionCode);
                node = nextNode;
            } else {
                fragment->removeChild(node, ignoredExceptionCode);
                node = firstChild;
            }
        } else if (node->id() == ID_HEAD) {
            NodeImpl *nextNode = node->nextSibling();
            fragment->removeChild(node, ignoredExceptionCode);
            node = nextNode;
        } else {
            node = node->nextSibling();
        }
    }

    return f;
}

void HTMLElementImpl::setInnerHTML(const DOMString &html, int &exceptioncode)
{
    if (id() == ID_SCRIPT || id() == ID_STYLE) {
        // Script and CSS source shouldn't be parsed as HTML.
        removeChildren();
        appendChild(document()->createTextNode(html), exceptioncode);
        return;
    }

    DocumentFragment fragment = createContextualFragment(html);
    if (fragment.isNull()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }

    // Make sure adding the new child is ok, before removing all children (#96187)
    checkAddChild(fragment.handle(), exceptioncode);
    if (exceptioncode) {
        return;
    }

    removeChildren();
    appendChild(fragment.handle(), exceptioncode);
}

void HTMLElementImpl::setInnerText(const DOMString &text, int &exceptioncode)
{
    // following the IE specs.
    if (endTagRequirement(id()) == FORBIDDEN) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }
    // IE disallows innerHTML on inline elements. I don't see why we should have this restriction, as our
    // dhtml engine can cope with it. Lars
    //if ( isInline() ) return false;
    switch (id()) {
    case ID_COL:
    case ID_COLGROUP:
    case ID_FRAMESET:
    case ID_HEAD:
    case ID_HTML:
    case ID_TABLE:
    case ID_TBODY:
    case ID_TFOOT:
    case ID_THEAD:
    case ID_TR:
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    default:
        break;
    }

    removeChildren();

    TextImpl *t = new TextImpl(docPtr(), text.implementation());
    appendChild(t, exceptioncode);
}

void HTMLElementImpl::addHTMLAlignment(DOMString alignment)
{
    //qDebug("alignment is %s", alignment.string().toLatin1().constData() );
    // vertical alignment with respect to the current baseline of the text
    // right or left means floating images
    int propfloat = -1;
    int propvalign = -1;
    if (strcasecmp(alignment, "absmiddle") == 0) {
        propvalign = CSS_VAL_MIDDLE;
    } else if (strcasecmp(alignment, "absbottom") == 0) {
        propvalign = CSS_VAL_BOTTOM;
    } else if (strcasecmp(alignment, "left") == 0) {
        propfloat = CSS_VAL_LEFT;
        propvalign = CSS_VAL_TOP;
    } else if (strcasecmp(alignment, "right") == 0) {
        propfloat = CSS_VAL_RIGHT;
        propvalign = CSS_VAL_TOP;
    } else if (strcasecmp(alignment, "top") == 0) {
        propvalign = CSS_VAL_TOP;
    } else if (strcasecmp(alignment, "middle") == 0) {
        propvalign = CSS_VAL__KHTML_BASELINE_MIDDLE;
    } else if (strcasecmp(alignment, "center") == 0) {
        propvalign = CSS_VAL_MIDDLE;
    } else if (strcasecmp(alignment, "bottom") == 0) {
        propvalign = CSS_VAL_BASELINE;
    } else if (strcasecmp(alignment, "texttop") == 0) {
        propvalign = CSS_VAL_TEXT_TOP;
    }

    if (propfloat != -1) {
        addCSSProperty(CSS_PROP_FLOAT, propfloat);
    }
    if (propvalign != -1) {
        addCSSProperty(CSS_PROP_VERTICAL_ALIGN, propvalign);
    }
}

DOMString HTMLElementImpl::contentEditable() const
{
    document()->updateRendering();

    if (!renderer()) {
        return "false";
    }

    switch (renderer()->style()->userInput()) {
    case UI_ENABLED:
        return "true";
    case UI_DISABLED:
    case UI_NONE:
        return "false";
    default:;
    }
    return "inherit";
}

void HTMLElementImpl::setContentEditable(AttributeImpl *attr)
{
    const DOMString &enabled = attr->value();
    if (enabled.isEmpty() || strcasecmp(enabled, "true") == 0) {
        addCSSProperty(CSS_PROP__KHTML_USER_INPUT, CSS_VAL_ENABLED);
    } else if (strcasecmp(enabled, "false") == 0) {
        addCSSProperty(CSS_PROP__KHTML_USER_INPUT, CSS_VAL_NONE);
    } else if (strcasecmp(enabled, "inherit") == 0) {
        addCSSProperty(CSS_PROP__KHTML_USER_INPUT, CSS_VAL_INHERIT);
    }
}

void HTMLElementImpl::setContentEditable(const DOMString &enabled)
{
    if (enabled == "inherit") {
        int exceptionCode;
        removeAttribute(ATTR_CONTENTEDITABLE, exceptionCode);
    } else {
        setAttribute(ATTR_CONTENTEDITABLE, enabled.isEmpty() ? "true" : enabled);
    }
}

DOMString HTMLElementImpl::toString() const
{
    if (!hasChildNodes()) {
        DOMString result = openTagStartToString();
        result += ">";

        if (endTagRequirement(id()) == REQUIRED) {
            result += "</";
            result += nonCaseFoldedTagName();
            result += ">";
        }

        return result;
    }

    return ElementImpl::toString();
}

// -------------------------------------------------------------------------
HTMLGenericElementImpl::HTMLGenericElementImpl(DocumentImpl *doc, ushort i)
    : HTMLElementImpl(doc)
{
    m_localName = LocalName::fromId(i);
}

HTMLGenericElementImpl::HTMLGenericElementImpl(DocumentImpl *doc, LocalName l)
    : HTMLElementImpl(doc),
      m_localName(l)
{}

HTMLGenericElementImpl::~HTMLGenericElementImpl()
{
}
