/*******************************************************************************
 * Copyright (c) 2011 Association for Decentralized Information Management in
 * Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.diagram.profile;

import java.awt.Font;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

import org.simantics.common.color.Color;
import org.simantics.databoard.Bindings;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.variable.Variable;
import org.simantics.diagram.elements.TextNode;
import org.simantics.diagram.synchronization.graph.DiagramGraphUtil;
import org.simantics.g2d.utils.Alignment;
import org.simantics.modeling.ModelingResources;
import org.simantics.scenegraph.INode;
import org.simantics.scenegraph.profile.EvaluationContext;
import org.simantics.scenegraph.profile.common.ProfileVariables;
import org.simantics.scenegraph.utils.GeometryUtils;
import org.simantics.scenegraph.utils.NodeUtil;
import org.simantics.ui.colors.Colors;

/**
 * @author Tuukka Lehtonen
 * @author Marko Luukkainen
 */
public abstract class TextStyle extends StyleBase<MonitorTextResult> {

    private final Font  FONT             = Font.decode("Arial 12");
    private final java.awt.Color BACKGROUND_COLOR = new java.awt.Color(255, 255, 255, 192);

    protected double xOffset;
    protected double yOffset;

    public TextStyle() {
        this(0.0, -2.2);
    }

    public TextStyle(double xOffset, double yOffset) {
        this.xOffset = xOffset;
        this.yOffset = yOffset;
    }

    public abstract Resource getPropertyRelation(ReadGraph g, Resource module);

    /**
     * @return the name of the scene graph node to create to represent the text
     *         element created by this style
     */
    public abstract String getNodeName();

    /**
     * Override to customize.
     * 
     * @param graph
     * @param element
     * @return
     * @throws DatabaseException
     */
    protected Resource getConfigurationComponent(ReadGraph graph, Resource element) throws DatabaseException {
        ModelingResources mr = ModelingResources.getInstance(graph);
        Resource config = graph.getPossibleObject(element, mr.ElementToComponent);
        return config;
    }

    /**
     * Override to customize.
     * 
     * @param graph
     * @param element
     * @return
     * @throws DatabaseException
     */
    protected String getConfigurationComponentNameForElement(ReadGraph graph, Resource element) throws DatabaseException {
        Resource config = getConfigurationComponent(graph, element);
        if (config == null)
            return null;
        String name = graph.getPossibleRelatedValue(config, getPropertyRelation(graph,element), Bindings.STRING);
        return name;
    }

    public AffineTransform getTransform(AffineTransform parentTransform, Rectangle2D elementBounds, int location) {
        double scale = GeometryUtils.getScale(parentTransform);

        AffineTransform at = AffineTransform.getTranslateInstance(
                parentTransform.getTranslateX() + elementBounds.getCenterX() * scale + xOffset,
                parentTransform.getTranslateY() + elementBounds.getMinY() * scale + yOffset*location
        );
        at.scale(0.15, 0.15);

        return at;
    }

    @Override
    public MonitorTextResult calculateStyle(ReadGraph graph, Resource runtimeDiagram, Resource entry, Resource element, Variable configuration)
    throws DatabaseException {
        String name = getConfigurationComponentNameForElement(graph, element);
        if (name == null)
            return null;
        AffineTransform transform = DiagramGraphUtil.getAffineTransform(graph, element);
        return new MonitorTextResult(name, transform);
    }

    @Override
    public void applyStyleForNode(EvaluationContext observer, INode _node, MonitorTextResult result) {
        String value = result != null ? result.getText() : null;
        if (value != null && !value.isEmpty() && !value.trim().isEmpty()) {

            TextNode node = ProfileVariables.claimChild(_node, "", getNodeName(), TextNode.class, observer);
            if (node == null)
                return;

            Integer location = observer.getTemporaryProperty(_node, "location");
            if(location == null) location = 1;

            Rectangle2D bounds = NodeUtil.getLocalElementBounds(_node); 
//            Rectangle2D elementBounds = _node.getElementUtils.getElementBounds(element);
            AffineTransform at = getTransform(result.getParentTransform(), bounds, location);

            Color color = result.getColor();

            observer.setTemporaryProperty(_node, "location", location+1);

            node.setTransform(at);
            node.setHorizontalAlignment((byte) Alignment.CENTER.ordinal());
            node.setZIndex(3000);
            if(color != null) node.setColor(Colors.awt(color));
            else node.setColor(java.awt.Color.DARK_GRAY);

            node.setEditable(false);
            node.setFont(FONT);
            node.setText(value);

            node.setBackgroundColor(BACKGROUND_COLOR);
//            node.setBorderColor(Color.LIGHT_GRAY);
//            node.setBorderWidth(1.0f);
        } else {
            cleanupStyleForNode(observer, _node);
        }
    }

    @Override
    protected void cleanupStyleForNode(EvaluationContext observer, INode node) {
        ProfileVariables.denyChild(node, "", getNodeName());
    }

}