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package org.jgrasstools.gears.utils.style;

import static org.jgrasstools.gears.utils.style.Utilities.sf;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.geotools.styling.FeatureTypeConstraint;
import org.geotools.styling.FeatureTypeStyle;
import org.geotools.styling.SLDTransformer;
import org.geotools.styling.Style;
import org.geotools.styling.StyledLayerDescriptor;
import org.geotools.styling.UserLayer;

/**
 * A wrapper for the {@link Style} object to ease gui use.
 * 
 * @author Andrea Antonello (www.hydrologis.com)
 */
public class StyleWrapper {

    private Style style;
    private String name;
    private List featureTypeStylesWrapperList = new ArrayList();

    public StyleWrapper(Style style) {
        this.style = style;
        name = style.getName();

        List featureTypeStyles = style.featureTypeStyles();
        for (FeatureTypeStyle featureTypeStyle : featureTypeStyles) {
            FeatureTypeStyleWrapper fstW = new FeatureTypeStyleWrapper(featureTypeStyle, this);
            featureTypeStylesWrapperList.add(fstW);
        }
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        style.setName(name);
    }

    /**
     * Getter for the list of {@link FeatureTypeStyleWrapper}s.
     * 
     * @return an unmodifiable list of {@link FeatureTypeStyleWrapper}. 
     *              To add or remove items use {@link #addFeatureTypeStyle(FeatureTypeStyle)}
     *              and {@link #removeFeatureTypeStyle(FeatureTypeStyleWrapper)}.
     */
    public List getFeatureTypeStylesWrapperList() {
        return Collections.unmodifiableList(featureTypeStylesWrapperList);
    }

    /**
     * Facility to get the first rule, if available.
     * 
     * @return the first rule or null.
     */
    public RuleWrapper getFirstRule() {
        if (featureTypeStylesWrapperList.size() > 0) {
            FeatureTypeStyleWrapper featureTypeStyleWrapper = featureTypeStylesWrapperList.get(0);
            List rulesWrapperList = featureTypeStyleWrapper.getRulesWrapperList();
            if (rulesWrapperList.size() > 0) {
                RuleWrapper ruleWrapper = rulesWrapperList.get(0);
                return ruleWrapper;
            }
        }
        return null;
    }

    //    /**
    //     * Add a supplied or new {@link FeatureTypeStyle} to the {@link Style}.
    //     * 
    //     * @param tmpFts the new {@link FeatureTypeStyle} or null to create a new one.
    //     * @return the {@link FeatureTypeStyleWrapper} for the new {@link FeatureTypeStyle}.
    //     */
    //    public FeatureTypeStyleWrapper addFeatureTypeStyle( FeatureTypeStyle tmpFts ) {
    //        if (tmpFts == null)
    //            tmpFts = Utilities.sf.createFeatureTypeStyle();
    //
    //        style.featureTypeStyles().add(0, tmpFts);
    //
    //        FeatureTypeStyleWrapper wrapper = new FeatureTypeStyleWrapper(tmpFts, this);
    //        featureTypeStylesWrapperList.add(0, wrapper);
    //        return wrapper;
    //    }

    /**
     * Remove a {@link FeatureTypeStyleWrapper} from the list.
     * 
     * @param ftsW the {@link FeatureTypeStyle} to remove.
     */
    public void removeFeatureTypeStyle(FeatureTypeStyleWrapper ftsW) {
        FeatureTypeStyle fts = ftsW.getFeatureTypeStyle();
        style.featureTypeStyles().remove(fts);
        featureTypeStylesWrapperList.remove(ftsW);
    }

    /**
     * Clear all the {@link FeatureTypeStyle}s and {@link FeatureTypeStyleWrapper}s.
     */
    public void clear() {
        style.featureTypeStyles().clear();
        featureTypeStylesWrapperList.clear();
    }

    /**
     * Converts a style to its string representation to be written to file.
     * 
     * @param style the style to convert.
     * @return the style string.
     * @throws Exception
     */
    public String toXml() throws Exception {
        StyledLayerDescriptor sld = sf.createStyledLayerDescriptor();
        UserLayer layer = sf.createUserLayer();
        layer.setLayerFeatureConstraints(new FeatureTypeConstraint[] { null });
        sld.addStyledLayer(layer);
        layer.addUserStyle(style);

        SLDTransformer aTransformer = new SLDTransformer();
        aTransformer.setIndentation(4);
        String xml = aTransformer.transform(sld);
        return xml;
    }

    public Style getStyle() {
        return style;
    }

    /**
     * Swap two elements of the list.
     * 
     * @param src the position first element.
     * @param dest the position second element. 
     */
    public void swap(int src, int dest) {
        List ftss = style.featureTypeStyles();
        if (src >= 0 && src < ftss.size() && dest >= 0 && dest < ftss.size()) {
            Collections.swap(ftss, src, dest);
            Collections.swap(featureTypeStylesWrapperList, src, dest);
        }
    }

}