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package javafx.css.converter;

import javafx.css.Size;
import javafx.css.ParsedValue;
import javafx.css.StyleConverter;
import javafx.geometry.Insets;
import javafx.scene.text.Font;

Converts a parsed value array of 1 to 4 size components to an Insets.
The size values are interpreted as
top, right, bottom, left.
If only top is given, that value is used on all sides.
If there is only top and right, then bottom is set to top and left is set to right.
If top, right and bottom are given, then left is set to right.
Since:
9/**
 * Converts a parsed value array of 1 to 4 size components to an Insets.
 * The size values are interpreted as
 * top, right, bottom, left.
 * If only top is given, that value is used on all sides.
 * If there is only top and right, then bottom is set to top and left is set to right.
 * If top, right and bottom are given, then left is set to right.
 *
 * @since 9
 */
public final class InsetsConverter extends StyleConverter<ParsedValue[], Insets> {

    // lazy, thread-safe instatiation
    private static class Holder {
        static final InsetsConverter INSTANCE = new InsetsConverter();
        static final SequenceConverter SEQUENCE_INSTANCE = new SequenceConverter();
    }

    public static StyleConverter<ParsedValue[], Insets> getInstance() {
        return Holder.INSTANCE;
    }

    private InsetsConverter() {
        super();
    }

    @Override
    public Insets convert(ParsedValue<ParsedValue[], Insets> value, Font font) {
        ParsedValue[] sides = value.getValue();
        double top = ((Size)sides[0].convert(font)).pixels(font);
        double right = (sides.length > 1) ? ((Size)sides[1].convert(font)).pixels(font) : top;
        double bottom = (sides.length > 2) ? ((Size)sides[2].convert(font)).pixels(font) : top;
        double left = (sides.length > 3) ? ((Size)sides[3].convert(font)).pixels(font) : right;
        return new Insets(top, right, bottom, left);
    }

    @Override
    public String toString() {
        return "InsetsConverter";
    }

    
Converts an array of parsed values, each of which is an array
of 1 to 4 size components, to an array of Insets objects.
/**
     * Converts an array of parsed values, each of which is an array
     * of 1 to 4 size components, to an array of Insets objects.
     */
    public static final class SequenceConverter extends StyleConverter<ParsedValue<ParsedValue[], Insets>[], Insets[]> {

        public static SequenceConverter getInstance() {
            return Holder.SEQUENCE_INSTANCE;
        }

        private SequenceConverter() {
            super();
        }

        @Override
        public Insets[] convert(ParsedValue<ParsedValue<ParsedValue[], Insets>[], Insets[]> value, Font font) {
            ParsedValue<ParsedValue[], Insets>[] layers = value.getValue();
            Insets[] insets = new Insets[layers.length];
            for (int layer = 0; layer < layers.length; layer++) {
                insets[layer] = InsetsConverter.getInstance().convert(layers[layer], font);
            }
            return insets;
        }

        @Override
        public String toString() {
            return "InsetsSequenceConverter";
        }
    }
}