/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <com/sun/star/container/XNameAccess.hpp>
#include <com/sun/star/container/XNameContainer.hpp>
#include <com/sun/star/drawing/ColorTable.hpp>
#include <com/sun/star/uno/Any.hxx>
#include <com/sun/star/uno/Reference.hxx>
#include <com/sun/star/uno/RuntimeException.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <comphelper/processfactory.hxx>
#include <rtl/ustring.hxx>
#include <vcl/svapp.hxx>

#include "lookupcolorname.hxx"
#include <unordered_map>

namespace
{
class ColorNameMap
{
public:
    ColorNameMap();
    ColorNameMap(const ColorNameMap&) = delete;
    ColorNameMap& operator=(const ColorNameMap&) = delete;

    OUString lookUp(tools::Long color) const;

private:
    typedef std::unordered_map<tools::Long, OUString> Map;

    Map map_;
};

ColorNameMap::ColorNameMap()
{
    css::uno::Sequence<OUString> aNames;
    css::uno::Reference<css::container::XNameAccess> xNA;

    try
    {
        // Create color table in which to look up the given color.
        css::uno::Reference<css::container::XNameContainer> xColorTable
            = css::drawing::ColorTable::create(comphelper::getProcessComponentContext());

        // Get list of color names in order to iterate over the color table.

        // Lock the solar mutex here as workaround for missing lock in
        // called function.
        SolarMutexGuard aGuard;
        xNA = xColorTable;
        aNames = xColorTable->getElementNames();
    }
    catch (css::uno::RuntimeException const&)
    {
        // When an exception occurred then we have an empty name sequence
        // and the loop below is not entered.
    }

    // Fill the map to convert from numerical color values to names.
    if (!xNA.is())
        return;

    for (const auto& rName : std::as_const(aNames))
    {
        // Get the numerical value for the i-th color name.
        try
        {
            css::uno::Any aColor = xNA->getByName(rName);
            tools::Long nColor = 0;
            aColor >>= nColor;
            map_[nColor] = rName;
        }
        catch (css::uno::RuntimeException const&)
        {
            // Ignore the exception: the color who lead to the exception
            // is not included into the map.
        }
    }
}

OUString ColorNameMap::lookUp(tools::Long color) const
{
    Map::const_iterator i(map_.find(color));
    if (i != map_.end())
    {
        return i->second;
    }
    // Did not find the given color; return its RGB tuple representation:
    return "#" + OUString::number(color, 16);
}
}

namespace accessibility
{
OUString lookUpColorName(tools::Long color)
{
    static ColorNameMap theColorNameMap;
    return theColorNameMap.lookUp(color);
}
}

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