/*
 * Copyright (C) 2004 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "jsediting.h"

#include "cssproperties.h"
#include "htmlediting.h"
#include "khtml_part.h"
#include "qstring.h"
#include "selection.h"

#if APPLE_CHANGES
#include "KWQKHTMLPart.h"
#endif

using khtml::TypingCommand;

namespace DOM {

class DocumentImpl;

namespace {

bool supportsPasteCommand = false;

struct CommandImp {
    bool (*execFn)(KHTMLPart *part, bool userInterface, const DOMString &value);
    bool (*enabledFn)(KHTMLPart *part);
    KHTMLPart::TriState (*stateFn)(KHTMLPart *part);
    DOMString (*valueFn)(KHTMLPart *part);
};

QDict<CommandImp> createCommandDictionary();

const CommandImp *commandImp(const DOMString &command)
{
    static QDict<CommandImp> commandDictionary = createCommandDictionary();
    return commandDictionary.find(command.string());
}

} // anonymous namespace

bool JSEditor::execCommand(const DOMString &command, bool userInterface, const DOMString &value)
{
    const CommandImp *cmd = commandImp(command);
    if (!cmd)
        return false;
    KHTMLPart *part = m_doc->part();
    if (!part)
        return false;
    m_doc->updateLayout();
    return cmd->enabledFn(part) && cmd->execFn(part, userInterface, value);
}

bool JSEditor::queryCommandEnabled(const DOMString &command)
{
    const CommandImp *cmd = commandImp(command);
    if (!cmd)
        return false;
    KHTMLPart *part = m_doc->part();
    if (!part)
        return false;
    m_doc->updateLayout();
    return cmd->enabledFn(part);
}

bool JSEditor::queryCommandIndeterm(const DOMString &command)
{
    const CommandImp *cmd = commandImp(command);
    if (!cmd)
        return false;
    KHTMLPart *part = m_doc->part();
    if (!part)
        return false;
    m_doc->updateLayout();
    return cmd->stateFn(part) == KHTMLPart::mixedTriState;
}

bool JSEditor::queryCommandState(const DOMString &command)
{
    const CommandImp *cmd = commandImp(command);
    if (!cmd)
        return false;
    KHTMLPart *part = m_doc->part();
    if (!part)
        return false;
    m_doc->updateLayout();
    return cmd->stateFn(part) != KHTMLPart::falseTriState;
}

bool JSEditor::queryCommandSupported(const DOMString &command)
{
    if (!supportsPasteCommand && command.string().lower() == "paste")
        return false;
    return commandImp(command) != 0;
}

DOMString JSEditor::queryCommandValue(const DOMString &command)
{
    const CommandImp *cmd = commandImp(command);
    if (!cmd)
        return DOMString();
    KHTMLPart *part = m_doc->part();
    if (!part)
        return DOMString();
    m_doc->updateLayout();
    return cmd->valueFn(part);
}

void JSEditor::setSupportsPasteCommand(bool flag)
{
    supportsPasteCommand = flag;
}

// =============================================================================================

// Private stuff, all inside an anonymous namespace.

namespace {

bool execStyleChange(KHTMLPart *part, int propertyID, const DOMString &propertyValue)
{
    CSSMutableStyleDeclarationImpl *style = new CSSMutableStyleDeclarationImpl;
    style->setProperty(propertyID, propertyValue);
    style->ref();
    part->applyStyle(style);
    style->deref();
    return true;
}

bool execStyleChange(KHTMLPart *part, int propertyID, const char *propertyValue)
{
    return execStyleChange(part, propertyID, DOMString(propertyValue));
}

KHTMLPart::TriState stateStyle(KHTMLPart *part, int propertyID, const char *desiredValue)
{
    CSSMutableStyleDeclarationImpl *style = new CSSMutableStyleDeclarationImpl;
    style->setProperty(propertyID, desiredValue);
    style->ref();
    KHTMLPart::TriState state = part->selectionHasStyle(style);
    style->deref();
    return state;
}

bool selectionStartHasStyle(KHTMLPart *part, int propertyID, const char *desiredValue)
{
    CSSMutableStyleDeclarationImpl *style = new CSSMutableStyleDeclarationImpl;
    style->setProperty(propertyID, desiredValue);
    style->ref();
    bool hasStyle = part->selectionStartHasStyle(style);
    style->deref();
    return hasStyle;
}

DOMString valueStyle(KHTMLPart *part, int propertyID)
{
    return part->selectionStartStylePropertyValue(propertyID);
}

// =============================================================================================
//
// execCommand implementations
//

bool execBackColor(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_BACKGROUND_COLOR, value);
}

bool execBold(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    bool isBold = selectionStartHasStyle(part, CSS_PROP_FONT_WEIGHT, "bold");
    return execStyleChange(part, CSS_PROP_FONT_WEIGHT, isBold ? "normal" : "bold");
}

bool execCopy(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    part->copyToPasteboard();
    return true;
}

bool execCut(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    part->cutToPasteboard();
    return true;
}

bool execDelete(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    TypingCommand::deleteKeyPressed(part->xmlDocImpl(), part->selectionGranularity() == khtml::WORD);
    return true;
}

bool execForwardDelete(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    TypingCommand::forwardDeleteKeyPressed(part->xmlDocImpl());
    return true;
}

bool execFontName(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_FONT_FAMILY, value);
}

bool execFontSize(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_FONT_SIZE, value);
}

bool execFontSizeDelta(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP__KHTML_FONT_SIZE_DELTA, value);
}

bool execForeColor(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_COLOR, value);
}

bool execIndent(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    // FIXME: Implement.
    return false;
}

bool execInsertLineBreak(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    TypingCommand::insertLineBreak(part->xmlDocImpl());
    return true;
}

bool execInsertParagraph(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    TypingCommand::insertParagraphSeparator(part->xmlDocImpl());
    return true;
}

bool execInsertText(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    TypingCommand::insertText(part->xmlDocImpl(), value);
    return true;
}

bool execItalic(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    bool isItalic = selectionStartHasStyle(part, CSS_PROP_FONT_STYLE, "italic");
    return execStyleChange(part, CSS_PROP_FONT_STYLE, isItalic ? "normal" : "italic");
}

bool execJustifyCenter(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_TEXT_ALIGN, "center");
}

bool execJustifyFull(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_TEXT_ALIGN, "justify");
}

bool execJustifyLeft(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_TEXT_ALIGN, "left");
}

bool execJustifyRight(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    return execStyleChange(part, CSS_PROP_TEXT_ALIGN, "right");
}

bool execOutdent(KHTMLPart *part, bool userInterface, const DOMString &value)
{
    // FIXME: Implement.
    return false;
}

bool execPaste(KHTMLPart *part, bool userInterface, const DOMString &value)