/* -*- 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 <sal/log.hxx>

#include <vcl/svapp.hxx>
#include <vcl/sysdata.hxx>

#ifdef MACOSX
#include <osx/salinst.h>
#include <osx/saldata.hxx>
#include <osx/salframe.h>
#else
#include "headless/svpframe.hxx"
#include "headless/svpinst.hxx"
#include "headless/svpvd.hxx"
#endif
#include <quartz/salgdi.h>
#include <quartz/salvd.h>
#include <quartz/utils.h>

std::unique_ptr<SalVirtualDevice> AquaSalInstance::CreateVirtualDevice( SalGraphics* pGraphics,
                                                        long &nDX, long &nDY,
                                                        DeviceFormat eFormat,
                                                        const SystemGraphicsData *pData )
{
    // #i92075# can be called first in a thread
    SalData::ensureThreadAutoreleasePool();

#ifdef IOS
    if( pData )
    {
        return std::unique_ptr<SalVirtualDevice>(new AquaSalVirtualDevice( static_cast< AquaSalGraphics* >( pGraphics ),
                                         nDX, nDY, eFormat, pData ));
    }
    else
    {
        std::unique_ptr<SalVirtualDevice> pNew(new AquaSalVirtualDevice( NULL, nDX, nDY, eFormat, NULL ));
        pNew->SetSize( nDX, nDY );
        return pNew;
    }
#else
    return std::unique_ptr<SalVirtualDevice>(new AquaSalVirtualDevice( static_cast< AquaSalGraphics* >( pGraphics ),
                                     nDX, nDY, eFormat, pData ));
#endif
}

AquaSalVirtualDevice::AquaSalVirtualDevice( AquaSalGraphics* pGraphic, long &nDX, long &nDY,
                                            DeviceFormat eFormat, const SystemGraphicsData *pData )
  : mbGraphicsUsed( false )
  , mnBitmapDepth( 0 )
  , mnWidth(0)
  , mnHeight(0)
{
    SAL_INFO( "vcl.virdev", "AquaSalVirtualDevice::AquaSalVirtualDevice() this=" << this
              << " size=(" << nDX << "x" << nDY << ") bitcount=" << static_cast<int>(eFormat) <<
              " pData=" << pData << " context=" << (pData ? pData->rCGContext : nullptr) );

    if( pGraphic && pData && pData->rCGContext )
    {
        // Create virtual device based on existing SystemGraphicsData
        // We ignore nDx and nDY, as the desired size comes from the SystemGraphicsData.
        // the mxContext is from pData (what "mxContext"? there is no such field anywhere in vcl;)
        mbForeignContext = true;
        mpGraphics = new AquaSalGraphics( /*pGraphic*/ );
        if (nDX == 0)
        {
            nDX = 1;
        }
        if (nDY == 0)
        {
            nDY = 1;
        }
        maLayer.set(CGLayerCreateWithContext(pData->rCGContext, CGSizeMake(nDX, nDY), nullptr));
        // Interrogate the context as to its real size
        if (maLayer.isSet())
        {
            const CGSize aSize = CGLayerGetSize(maLayer.get());
            nDX = static_cast<long>(aSize.width);
            nDY = static_cast<long>(aSize.height);
        }
        else
        {
            nDX = 0;
            nDY = 0;
        }

        mpGraphics->SetVirDevGraphics(maLayer, pData->rCGContext);
    }
    else
    {
        // create empty new virtual device
        mbForeignContext = false;           // the mxContext is created within VCL
        mpGraphics = new AquaSalGraphics(); // never fails
        switch (eFormat)
        {
            case DeviceFormat::BITMASK:
                mnBitmapDepth = 1;
                break;
#ifdef IOS
            case DeviceFormat::GRAYSCALE:
                mnBitmapDepth = 8;
                break;
#endif
            default:
                mnBitmapDepth = 0;
                break;
        }
#ifdef MACOSX
        // inherit resolution from reference device
        if( pGraphic )
        {
            AquaSalFrame* pFrame = pGraphic->getGraphicsFrame();
            if( pFrame && AquaSalFrame::isAlive( pFrame ) )
            {
                mpGraphics->setGraphicsFrame( pFrame );
                mpGraphics->copyResolution( *pGraphic );
            }
        }
#endif
        if( nDX && nDY )
        {
            SetSize( nDX, nDY );
        }
        // NOTE: if SetSize does not succeed, we just ignore the nDX and nDY
    }
}

AquaSalVirtualDevice::~AquaSalVirtualDevice()
{
    SAL_INFO( "vcl.virdev", "AquaSalVirtualDevice::~AquaSalVirtualDevice() this=" << this );

    if( mpGraphics )
    {
        mpGraphics->SetVirDevGraphics( nullptr, nullptr );
        delete mpGraphics;
        mpGraphics = nullptr;
    }
    Destroy();
}

void AquaSalVirtualDevice::Destroy()
{
    SAL_INFO( "vcl.virdev", "AquaSalVirtualDevice::Destroy() this=" << this << " mbForeignContext=" << mbForeignContext );

    if( mbForeignContext )
    {
        // Do not delete mxContext that we have received from outside VCL
        maLayer.set(nullptr);
        return;
    }

    if (maLayer.isSet())
    {
        if( mpGraphics )
        {
            mpGraphics->SetVirDevGraphics(nullptr, nullptr);
        }
        CGLayerRelease(maLayer.get());
        maLayer.set(nullptr);
    }

    if (maBitmapContext.isSet())
    {
        void* pRawData = CGBitmapContextGetData(maBitmapContext.get());
        std::free(pRawData);
        CGContextRelease(maBitmapContext.get());
        maBitmapContext.set(nullptr);
    }
}

SalGraphics* AquaSalVirtualDevice::AcquireGraphics()
{
    if( mbGraphicsUsed || !mpGraphics )
    {
        return nullptr;
    }
    mbGraphicsUsed = true;
    return mpGraphics;
}

void AquaSalVirtualDevice::ReleaseGraphics( SalGraphics* )
{
    mbGraphicsUsed = false;
}

bool AquaSalVirtualDevice::SetSize( long nDX, long nDY )
{
    SAL_INFO( "vcl.virdev", "AquaSalVirtualDevice::SetSize() this=" << this <<
              " (" << nDX << "x" << nDY << ") mbForeignContext=" << (mbForeignContext ? "YES" : "NO"));

    if( mbForeignContext )
    {
        // Do not delete/resize mxContext that we have received from outside VCL
        return true;
    }

    if (maLayer.isSet())
    {
        const CGSize aSize = CGLayerGetSize(maLayer.get());
        if( (nDX == aSize.width) && (nDY == aSize.height) )
        {
            // Yay, we do not have to do anything :)
            return true;
        }
    }

    Destroy();

    mnWidth = nDX;
    mnHeight = nDY;

    // create a Quartz layer matching to the intended virdev usage
    CGContextHolder xCGContextHolder;
    if( mnBitmapDepth && (mnBitmapDepth < 16) )
    {
        mnBitmapDepth = 8;  // TODO: are 1bit vdevs worth it?
        const int nBytesPerRow = (mnBitmapDepth * nDX + 7) / 8;

        void* pRawData = std::malloc( nBytesPerRow * nDY );
        maBitmapContext.set(CGBitmapContextCreate( pRawData, nDX, nDY,
                                                 mnBitmapDepth, nBytesPerRow,
                                                 GetSalData()->mxGraySpace, kCGImageAlphaNone));
        xCGContextHolder = maBitmapContext;
    }
    else
    {
#ifdef MACOSX
        // default to a NSView target context
        AquaSalFrame* pSalFrame = mpGraphics->getGraphicsFrame();
        if( !pSalFrame || !AquaSalFrame::isAlive( pSalFrame ))
        {
            pSalFrame = static_cast<AquaSalFrame*>( GetSalData()->mpInstance->anyFrame() );
            if ( pSalFrame )
                // update the frame reference
                mpGraphics->setGraphicsFrame( pSalFrame );
        }
        if( pSalFrame )
        {
            // #i91990#
            NSWindow* pNSWindow = pSalFrame->getNSWindow();
            if ( pNSWindow )
            {
                NSGraphicsContext* pNSContext = [NSGraphicsContext graphicsContextWithWindow: pNSWindow];
                if( pNSContext )
                {
                    xCGContextHolder.set([pNSContext CGContext]);
                }
            }
        }
#endif

        if (!xCGContextHolder.isSet())
        {
            // assert(Application::IsBitmapRendering());
            mnBitmapDepth = 32;

            const int nBytesPerRow = (mnBitmapDepth * nDX) / 8;
            void* pRawData = std::malloc( nBytesPerRow * nDY );
#ifdef MACOSX
            const int nFlags = kCGImageAlphaNoneSkipFirst;
#else
            const int nFlags = kCGImageAlphaNoneSkipFirst | kCGImageByteOrder32Little;
#endif
            maBitmapContext.set(CGBitmapContextCreate(pRawData, nDX, nDY, 8, nBytesPerRow,
                                                      GetSalData()->mxRGBSpace, nFlags));
            xCGContextHolder = maBitmapContext;
        }
    }

    SAL_WARN_IF(!xCGContextHolder.isSet(), "vcl.quartz", "No context");

    const CGSize aNewSize = { static_cast<CGFloat>(nDX), static_cast<CGFloat>(nDY) };
    maLayer.set(CGLayerCreateWithContext(xCGContextHolder.get(), aNewSize, nullptr));

    if (maLayer.isSet() && mpGraphics)
    {
        // get the matching Quartz context
        CGContextRef xDrawContext = CGLayerGetContext( maLayer.get() );
        mpGraphics->SetVirDevGraphics(maLayer.get(), xDrawContext, mnBitmapDepth);
    }

    return maLayer.isSet();
}

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