// 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;
    }
}