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** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of the plugins of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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#include "qwasmcursor.h"

#include <QtCore/qdebug.h>

#include <emscripten/emscripten.h>

void QWasmCursor::changeCursor(QCursor *windowCursor, QWindow *window)
{
    if (windowCursor == nullptr)
        return;

    // FIXME: The HTML5 plugin sets the cursor on the native canvas; when using multiple windows
    // multiple cursors need to be managed taking mouse postion and stacking into account.
    Q_UNUSED(window);

    // Bitmap and custom cursors are not implemented (will fall back to "auto")
    if (windowCursor->shape() == Qt::BitmapCursor || windowCursor->shape() >= Qt::CustomCursor)
        qWarning() << "QWasmCursor: bitmap and custom cursors are not supported";

    QByteArray htmlCursorName = cursorShapeToHtml(windowCursor->shape());

    if (htmlCursorName.isEmpty())
        htmlCursorName = "auto";

    // Set cursor on the main canvas
    EM_ASM_ARGS({
        if (Module['canvas']) {
            Module['canvas'].style['cursor'] = Pointer_stringify($0);
        }
    }, htmlCursorName.constData());
}

QByteArray QWasmCursor::cursorShapeToHtml(Qt::CursorShape shape)
{
    QByteArray cursorName;

    switch (shape) {
    case Qt::ArrowCursor:
        cursorName = "default";
        break;
    case Qt::UpArrowCursor:
        break;
    case Qt::CrossCursor:
        cursorName = "crosshair";
        break;
    case Qt::WaitCursor:
        cursorName = "wait";
        break;
    case Qt::IBeamCursor:
        cursorName = "text";
        break;
    case Qt::SizeVerCursor:
        cursorName = "ns-resize";
        break;
    case Qt::SizeHorCursor:
        cursorName = "ew-resize";
        break;
    case Qt::SizeBDiagCursor:
        cursorName = "nesw-resize";
        break;
    case Qt::SizeFDiagCursor:
        cursorName = "nwse-resize";
        break;
    case Qt::SizeAllCursor:
        break; // no equivalent?
    case Qt::BlankCursor:
        cursorName = "none";
        break;
    case Qt::SplitVCursor:
        cursorName = "row-resize";
        break;
    case Qt::SplitHCursor:
        cursorName = "col-resize";
        break;
    case Qt::PointingHandCursor:
        cursorName = "pointer";
        break;
    case Qt::ForbiddenCursor:
        cursorName = "not-allowed";
        break;
    case Qt::WhatsThisCursor:
        cursorName = "help";
        break;
    case Qt::BusyCursor:
        cursorName = "wait";
        break;
    case Qt::OpenHandCursor:
        break; // no equivalent?
    case Qt::ClosedHandCursor:
        break; // no equivalent?
    case Qt::DragCopyCursor:
        break; // no equivalent?
    case Qt::DragMoveCursor:
        break; // no equivalent?
    case Qt::DragLinkCursor:
        break; // no equivalent?
    default:
        break;
    }

    return cursorName;
}