// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client.nonpublic;

import java.util.*;

public class CookieNetDelta
{
    private boolean mWasPoked;
    private Boolean mNowGrandPoobah;
    private Set<String> mAddedMembers = new HashSet<String>();
    private Set<String> mDroppedMembers = new HashSet<String>();

    public boolean hasData()
    {
        return mWasPoked || (mNowGrandPoobah != null) || !mAddedMembers.isEmpty() || !mDroppedMembers.isEmpty();
    }

    public boolean wasPoked()
    {
        return mWasPoked;
    }

    public Boolean getNowGrandPoobah()
    {
        return mNowGrandPoobah;
    }

    public Set<String> getAddedMembers()
    {
        return mAddedMembers;
    }

    public Set<String> getDroppedMembers()
    {
        return mDroppedMembers;
    }

    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder( "CookieNetDelta:" );
        if ( !hasData() )
        {
            sb.append( " zip!" );
        }
        else
        {
            if ( wasPoked() )
            {
                sb.append( " Poked" );
                if ( getNowGrandPoobah() != null )
                {
                    sb.append( " -" );
                }
            }
            if ( Boolean.TRUE.equals( getNowGrandPoobah() ) )
            {
                sb.append( " Now GrandPoobah!" );
            }
            else if ( Boolean.FALSE.equals( getNowGrandPoobah() ) )
            {
                sb.append( " GrandPoobah No More!" );
            }
            if ( !mAddedMembers.isEmpty() )
            {
                sb.append( "\n    Added: " ).append( mAddedMembers );
            }
            if ( !mDroppedMembers.isEmpty() )
            {
                sb.append( "\n    Dropped: " ).append( mDroppedMembers );
            }
        }
        return sb.toString();
    }

    public String setWasPoked( String pLastValue, String pNewValue )
    {
        if ( pNewValue == null )
        {
            return pLastValue;
        }
        mWasPoked = !pNewValue.equals( pLastValue );
        return pNewValue;
    }

    public boolean setNowGrandPoobah( boolean pWasGrandPoobah, boolean pNowGrandPoobah )
    {
        if ( pWasGrandPoobah != pNowGrandPoobah )
        {
            mNowGrandPoobah = pNowGrandPoobah;
        }
        return pNowGrandPoobah;
    }

    public Set<String> adjustMembers( Set<String> pCurMembers, Set<String> pNewMembers )
    {
        for ( String zMember : pCurMembers )
        {
            if ( !pNewMembers.contains( zMember ) )
            {
                mDroppedMembers.add( zMember );
            }
        }
        for ( String zMember : pNewMembers )
        {
            if ( !pCurMembers.contains( zMember ) )
            {
                mAddedMembers.add( zMember );
            }
        }
        pCurMembers.removeAll( mDroppedMembers );
        pCurMembers.addAll( mAddedMembers );
        return pCurMembers;
    }
}