// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under    *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0          *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************

#ifndef RTL_H_0183487180058718273432148
#define RTL_H_0183487180058718273432148

#include <zen/optional.h>
#include <wx/dcmemory.h>
#include <wx/image.h>
#include <wx/app.h>


namespace zen
{
//functions supporting right-to-left GUI layout
void drawBitmapRtlMirror  (wxDC& dc, const wxBitmap& image, const wxRect& rect, int alignment, Opt<wxBitmap>& buffer);
void drawBitmapRtlNoMirror(wxDC& dc, const wxBitmap& image, const wxRect& rect, int alignment);
//wxDC::DrawIcon DOES mirror by default -> implement RTL support when needed

wxBitmap mirrorIfRtl(const wxBitmap& bmp);

//manual text flow correction: http://www.w3.org/International/articles/inline-bidi-markup/








//---------------------- implementation ------------------------
namespace impl
{
//don't use wxDC::DrawLabel: it results in expensive GetTextExtent() call even when passing an empty string!!!
//also avoid wxDC::DrawLabel 1-off alignment bugs
inline
void drawBitmapAligned(wxDC& dc, const wxBitmap& image, const wxRect& rect, int alignment)
{
    wxPoint pt = rect.GetTopLeft();
    if (alignment & wxALIGN_RIGHT) //note: wxALIGN_LEFT == 0!
        pt.x += rect.width - image.GetWidth();
    else if (alignment & wxALIGN_CENTER_HORIZONTAL)
        pt.x += (rect.width - image.GetWidth()) / 2;

    if (alignment & wxALIGN_BOTTOM) //note: wxALIGN_TOP == 0!
        pt.y += rect.height - image.GetHeight();
    else if (alignment & wxALIGN_CENTER_VERTICAL)
        pt.y += (rect.height - image.GetHeight()) / 2;

    dc.DrawBitmap(image, pt);
}
}


inline
void drawBitmapRtlMirror(wxDC& dc, const wxBitmap& image, const wxRect& rect, int alignment, Opt<wxBitmap>& buffer)
{
    if (dc.GetLayoutDirection() == wxLayout_RightToLeft)
    {
        if (!buffer || buffer->GetWidth() != rect.width || buffer->GetHeight() < rect.height) //[!] since we do a mirror, width needs to match exactly!
            buffer = wxBitmap(rect.width, rect.height);

        wxMemoryDC memDc(*buffer);
        memDc.Blit(wxPoint(0, 0), rect.GetSize(), &dc, rect.GetTopLeft()); //blit in: background is mirrored due to memDc, dc having different layout direction!

        impl::drawBitmapAligned(memDc, image, wxRect(0, 0, rect.width, rect.height), alignment);
        //note: we cannot simply use memDc.SetLayoutDirection(wxLayout_RightToLeft) due to some strange 1 pixel bug!

        dc.Blit(rect.GetTopLeft(), rect.GetSize(), &memDc, wxPoint(0, 0)); //blit out: mirror once again
    }
    else
        impl::drawBitmapAligned(dc, image, rect, alignment);
}


inline
void drawBitmapRtlNoMirror(wxDC& dc, const wxBitmap& image, const wxRect& rect, int alignment)
{
    return impl::drawBitmapAligned(dc, image, rect, alignment); //wxDC::DrawBitmap does NOT mirror by default
}


inline
wxBitmap mirrorIfRtl(const wxBitmap& bmp)
{
    if (wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft)
        return bmp.ConvertToImage().Mirror();
    else
        return bmp;
}
}

#endif //RTL_H_0183487180058718273432148