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#include <boost/bind.hpp>
#include "page.hxx"

namespace canvas
{
    Page::Page( const IRenderModuleSharedPtr &rRenderModule ) :
        mpRenderModule(rRenderModule),
        mpSurface(rRenderModule->createSurface(::basegfx::B2ISize()))
    {
    }

    void Page::validate()
    {
        if(!(isValid()))
        {
            ::std::for_each( mpFragments.begin(),
                             mpFragments.end(),
                             ::boost::mem_fn(&PageFragment::refresh));
        }
    }

    bool Page::isValid() const
    {
        return mpSurface && mpSurface->isValid();
    }

    FragmentSharedPtr Page::allocateSpace( const ::basegfx::B2ISize& rSize )
    {
        SurfaceRect rect(rSize);
        if(insert(rect))
        {
            FragmentSharedPtr pFragment(new PageFragment(rect,this));
            mpFragments.push_back(pFragment);
            return pFragment;
        }

        return FragmentSharedPtr();
    }

    bool Page::nakedFragment( const FragmentSharedPtr& pFragment )
    {
        SurfaceRect rect(pFragment->getSize());
        if(insert(rect))
        {
            pFragment->setPage(this);
            mpFragments.push_back(pFragment);
            return true;
        }

        return false;
    }

    void Page::free( const FragmentSharedPtr& pFragment )
    {
        // the fragment passes as argument is no longer
        // dedicated to this page. either it is about to
        // be relocated to some other page or it will
        // currently be deleted. in either case, simply
        // remove the reference from our internal storage.
        FragmentContainer_t::iterator it(
            std::remove(
                mpFragments.begin(),mpFragments.end(),pFragment));
        mpFragments.erase(it,mpFragments.end());
    }

    bool Page::insert( SurfaceRect& r )
    {
        const FragmentContainer_t::const_iterator aEnd(mpFragments.end());
        FragmentContainer_t::const_iterator       it(mpFragments.begin());
        while(it != aEnd)
        {
            const SurfaceRect &rect = (*it)->getRect();
            const sal_Int32 x = rect.maPos.getX();
            const sal_Int32 y = rect.maPos.getY();
            // to avoid interpolation artifacts from other textures,
            // one pixel gap between them
            const sal_Int32 w = rect.maSize.getX()+1;
            const sal_Int32 h = rect.maSize.getY()+1;

            // probe location to the right
            r.maPos.setX(x+w);
            r.maPos.setY(y);
            if(isValidLocation(r))
                return true;

            // probe location at bottom
            r.maPos.setX(x);
            r.maPos.setY(y+h);
            if(isValidLocation(r))
                return true;

            ++it;
        }

        r.maPos.setX(0);
        r.maPos.setY(0);

        return isValidLocation(r);
    }

    bool Page::isValidLocation( const SurfaceRect& r ) const
    {
        // the rectangle passed as argument has a valid
        // location if and only if there's no intersection
        // with existing areas.
        SurfaceRect aBoundary(mpRenderModule->getPageSize()-basegfx::B2IVector(1,1));
        if( !r.inside(aBoundary) )
            return false;

        const FragmentContainer_t::const_iterator aEnd(mpFragments.end());
        FragmentContainer_t::const_iterator       it(mpFragments.begin());
        while(it != aEnd)
        {
            if(r.intersection((*it)->getRect()))
                return false;

            ++it;
        }

        return true;
    }
}

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