/*

 * Copyright (C) 2006, 2007, 2008 Apple 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 "config.h"

#include "Clipboard.h"

#include "CachedImage.h"

#include "Frame.h"

#include "FrameLoader.h"

#include "Image.h"

namespace WebCore {

Clipboard::Clipboard(ClipboardAccessPolicy policy, bool isForDragging) 

    : m_policy(policy)

    , m_dropEffect("uninitialized")

    , m_effectAllowed("uninitialized")

    , m_dragStarted(false)

    , m_forDragging(isForDragging)

    , m_dragImage(0)

{

}

void Clipboard::setAccessPolicy(ClipboardAccessPolicy policy)

{

    // once you go numb, can never go back

    ASSERT(m_policy != ClipboardNumb || policy == ClipboardNumb);

    m_policy = policy;

}

// These "conversion" methods are called by both WebCore and WebKit, and never make sense to JS, so we don't

// worry about security for these. They don't allow access to the pasteboard anyway.

static DragOperation dragOpFromIEOp(const String& op)

{

    // yep, it's really just this fixed set

    if (op == "uninitialized")

        return DragOperationEvery;

    if (op == "none")

        return DragOperationNone;

    if (op == "copy")

        return DragOperationCopy;

    if (op == "link")

        return DragOperationLink;

    if (op == "move")

        return (DragOperation)(DragOperationGeneric | DragOperationMove);

    if (op == "copyLink")

        return (DragOperation)(DragOperationCopy | DragOperationLink);

    if (op == "copyMove")

        return (DragOperation)(DragOperationCopy | DragOperationGeneric | DragOperationMove);

    if (op == "linkMove")

        return (DragOperation)(DragOperationLink | DragOperationGeneric | DragOperationMove);

    if (op == "all")

        return DragOperationEvery;

    return DragOperationPrivate;  // really a marker for "no conversion"

}

static String IEOpFromDragOp(DragOperation op)

{

    bool moveSet = !!((DragOperationGeneric | DragOperationMove) & op);

    if ((moveSet && (op & DragOperationCopy) && (op & DragOperationLink))

        || (op == DragOperationEvery))

        return "all";

    if (moveSet && (op & DragOperationCopy))

        return "copyMove";

    if (moveSet && (op & DragOperationLink))

        return "linkMove";

    if ((op & DragOperationCopy) && (op & DragOperationLink))

        return "copyLink";

    if (moveSet)

        return "move";

    if (op & DragOperationCopy)

        return "copy";

    if (op & DragOperationLink)

        return "link";

    return "none";

}

DragOperation Clipboard::sourceOperation() const

{

    DragOperation op = dragOpFromIEOp(m_effectAllowed);

    ASSERT(op != DragOperationPrivate);

    return op;

}

DragOperation Clipboard::destinationOperation() const

{

    DragOperation op = dragOpFromIEOp(m_dropEffect);

    ASSERT(op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == (DragOperation)(DragOperationGeneric | DragOperationMove) || op == DragOperationEvery);

    return op;

}

void Clipboard::setSourceOperation(DragOperation op)

{

    ASSERT_ARG(op, op != DragOperationPrivate);

    m_effectAllowed = IEOpFromDragOp(op);

}

void Clipboard::setDestinationOperation(DragOperation op)

{

    ASSERT_ARG(op, op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == DragOperationGeneric || op == DragOperationMove || op == (DragOperation)(DragOperationGeneric | DragOperationMove));

    m_dropEffect = IEOpFromDragOp(op);

}

void Clipboard::setDropEffect(const String &effect)

{

    if (!m_forDragging)

        return;

    // The attribute must ignore any attempts to set it to a value other than none, copy, link, and move. 

    if (effect != "none" && effect != "copy"  && effect != "link" && effect != "move")

        return;

    if (m_policy == ClipboardReadable || m_policy == ClipboardTypesReadable)

        m_dropEffect = effect;

}

void Clipboard::setEffectAllowed(const String &effect)

{

    if (!m_forDragging)

        return;

    if (dragOpFromIEOp(effect) == DragOperationPrivate) {

        // This means that there was no conversion, and the effectAllowed that

        // we are passed isn't a valid effectAllowed, so we should ignore it,

        // and not set m_effectAllowed.

        // The attribute must ignore any attempts to set it to a value other than 

        // none, copy, copyLink, copyMove, link, linkMove, move, all, and uninitialized.

        return;

    }

    if (m_policy == ClipboardWritable)

        m_effectAllowed = effect;

}

} // namespace WebCore