/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2021 Bruno Van de Velde (vdv_b@tgui.eu)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


#include <TGUI/Widgets/HorizontalLayout.hpp>
#include <numeric>

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

namespace tgui
{
    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    HorizontalLayout::HorizontalLayout(const char* typeName, bool initRenderer) :
        BoxLayoutRatios{typeName, false}
    {
        if (initRenderer)
        {
            m_renderer = aurora::makeCopied<BoxLayoutRenderer>();
            setRenderer(Theme::getDefault()->getRendererNoThrow(m_type));
        }
    }

    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    HorizontalLayout::Ptr HorizontalLayout::create(const Layout2d& size)
    {
        auto layout = std::make_shared<HorizontalLayout>();
        layout->setSize(size);
        return layout;
    }

    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    HorizontalLayout::Ptr HorizontalLayout::copy(HorizontalLayout::ConstPtr layout)
    {
        if (layout)
            return std::static_pointer_cast<HorizontalLayout>(layout->clone());
        else
            return nullptr;
    }

    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    void HorizontalLayout::updateWidgets()
    {
        const float totalSpaceBetweenWidgets = (m_spaceBetweenWidgetsCached * m_widgets.size()) - m_spaceBetweenWidgetsCached;
        const Vector2f contentSize = {getSize().x - m_paddingCached.getLeft() - m_paddingCached.getRight(),
                                          getSize().y - m_paddingCached.getTop() - m_paddingCached.getBottom()};

        const float totalRatio = std::accumulate(m_ratios.begin(), m_ratios.end(), 0.f);

        float currentOffset = 0;
        for (std::size_t i = 0; i < m_widgets.size(); ++i)
        {
            auto& widget = m_widgets[i];
            const float width = (contentSize.x - totalSpaceBetweenWidgets) * (m_ratios[i] / totalRatio);

            widget->setSize({width, contentSize.y});
            widget->setPosition({currentOffset, 0});

            // Correct the size for widgets that are bigger than what you set (e.g. have borders around it or a text next to them)
            if (widget->getFullSize() != widget->getSize())
            {
                const Vector2f newSize = widget->getSize() - (widget->getFullSize() - widget->getSize());
                if (newSize.x > 0 && newSize.y > 0)
                {
                    widget->setSize(newSize);
                    widget->setPosition(widget->getPosition() - widget->getWidgetOffset());
                }
            }

            currentOffset += width + m_spaceBetweenWidgetsCached;
        }
    }

    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
