/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2014, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.styling.builder;

import org.geotools.styling.PointPlacement;
import org.opengis.filter.expression.Expression;

/**
 * 
 *
 * @source $URL$
 */
public class PointPlacementBuilder extends AbstractStyleBuilder<PointPlacement> {
    private Expression rotation;

    private AnchorPointBuilder anchor = new AnchorPointBuilder(this, 0, 0).unset();

    private DisplacementBuilder displacement = new DisplacementBuilder(this).unset();

    public PointPlacementBuilder() {
        this(null);
    }

    public PointPlacementBuilder(AbstractStyleBuilder<?> parent) {
        super(parent);
        reset();
    }

    public PointPlacement build() {
        if (unset) {
            return null;
        }
        PointPlacement placement = sf
                .pointPlacement(anchor.build(), displacement.build(), rotation);
        if (parent == null) {
            reset();
        }
        return placement;
    }

    public AnchorPointBuilder anchor() {
        unset = false;
        return anchor;
    }

    public DisplacementBuilder displacement() {
        unset = false;
        return displacement;
    }

    public PointPlacementBuilder rotation(Expression rotation) {
        this.rotation = rotation;
        return this;
    }

    public PointPlacementBuilder rotation(double rotation) {
        return rotation(literal(rotation));
    }

    public PointPlacementBuilder rotation(String cqlExpression) {
        return rotation(cqlExpression(cqlExpression));
    }

    public PointPlacementBuilder reset() {
        rotation = literal(0);
        anchor.reset();
        displacement.reset();
        unset = false;
        return this;
    }

    public PointPlacementBuilder reset(PointPlacement placement) {
        if (placement == null) {
            return unset();
        }
        rotation = placement.getRotation();
        anchor.reset(placement.getAnchorPoint());
        displacement.reset(placement.getDisplacement());
        unset = false;
        return this;
    }

    public PointPlacementBuilder unset() {
        return (PointPlacementBuilder) super.unset();
    }

    protected void buildStyleInternal(StyleBuilder sb) {
        sb.featureTypeStyle().rule().text().labelText("label").pointPlacement().init(this);
    }

}