/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-present, by David Gilbert and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * 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; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 */

package org.jfree.chart.text;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Objects;
import org.jfree.chart.ui.RectangleAnchor;
import org.jfree.chart.ui.RectangleInsets;
import org.jfree.chart.ui.Size2D;
import org.jfree.chart.util.SerialUtils;

/**
 * A box containing a text block.
 */
public class TextBox implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 3360220213180203706L;

    /** The outline paint. */
    private transient Paint outlinePaint;

    /** The outline stroke. */
    private transient Stroke outlineStroke;

    /** The interior space. */
    private RectangleInsets interiorGap;

    /** The background paint. */
    private transient Paint backgroundPaint;

    /** The shadow paint. */
    private transient Paint shadowPaint;

    /** The shadow x-offset. */
    private double shadowXOffset = 2.0;

    /** The shadow y-offset. */
    private double shadowYOffset = 2.0;

    /** The text block. */
    private TextBlock textBlock;

    /**
     * Creates an empty text box.
     */
    public TextBox() {
        this((TextBlock) null);
    }

    /**
     * Creates a text box.
     *
     * @param text  the text.
     */
    public TextBox(String text) {
        this((TextBlock) null);
        if (text != null) {
            this.textBlock = new TextBlock();
            this.textBlock.addLine(text, new Font("SansSerif", Font.PLAIN, 10),
                    Color.BLACK);
        }
    }

    /**
     * Creates a new text box.
     *
     * @param block  the text block.
     */
    public TextBox(TextBlock block) {
        this.outlinePaint = Color.BLACK;
        this.outlineStroke = new BasicStroke(1.0f);
        this.interiorGap = new RectangleInsets(1.0, 3.0, 1.0, 3.0);
        this.backgroundPaint = new Color(255, 255, 192);
        this.shadowPaint = Color.GRAY;
        this.shadowXOffset = 2.0;
        this.shadowYOffset = 2.0;
        this.textBlock = block;
    }

    /**
     * Returns the outline paint.
     *
     * @return The outline paint.
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }

    /**
     * Sets the outline paint.
     *
     * @param paint  the paint.
     */
    public void setOutlinePaint(Paint paint) {
        this.outlinePaint = paint;
    }

    /**
     * Returns the outline stroke.
     *
     * @return The outline stroke.
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }

    /**
     * Sets the outline stroke.
     *
     * @param stroke  the stroke.
     */
    public void setOutlineStroke(Stroke stroke) {
        this.outlineStroke = stroke;
    }

    /**
     * Returns the interior gap.
     *
     * @return The interior gap.
     */
    public RectangleInsets getInteriorGap() {
        return this.interiorGap;
    }

    /**
     * Sets the interior gap.
     *
     * @param gap  the gap.
     */
    public void setInteriorGap(RectangleInsets gap) {
        this.interiorGap = gap;
    }

    /**
     * Returns the background paint.
     *
     * @return The background paint.
     */
    public Paint getBackgroundPaint() {
        return this.backgroundPaint;
    }

    /**
     * Sets the background paint.
     *
     * @param paint  the paint.
     */
    public void setBackgroundPaint(Paint paint) {
        this.backgroundPaint = paint;
    }

    /**
     * Returns the shadow paint.
     *
     * @return The shadow paint.
     */
    public Paint getShadowPaint() {
        return this.shadowPaint;
    }

    /**
     * Sets the shadow paint.
     *
     * @param paint  the paint.
     */
    public void setShadowPaint(Paint paint) {
        this.shadowPaint = paint;
    }

    /**
     * Returns the x-offset for the shadow effect.
     *
     * @return The offset.
     */
    public double getShadowXOffset() {
        return this.shadowXOffset;
    }

    /**
     * Sets the x-offset for the shadow effect.
     *
     * @param offset  the offset (in Java2D units).
     */
    public void setShadowXOffset(double offset) {
        this.shadowXOffset = offset;
    }

    /**
     * Returns the y-offset for the shadow effect.
     *
     * @return The offset.
     */
    public double getShadowYOffset() {
        return this.shadowYOffset;
    }

    /**
     * Sets the y-offset for the shadow effect.
     *
     * @param offset  the offset (in Java2D units).
     */
    public void setShadowYOffset(double offset) {
        this.shadowYOffset = offset;
    }

    /**
     * Returns the text block.
     *
     * @return The text block.
     */
    public TextBlock getTextBlock() {
        return this.textBlock;
    }

    /**
     * Sets the text block.
     *
     * @param block  the block.
     */
    public void setTextBlock(TextBlock block) {
        this.textBlock = block;
    }

    /**
     * Draws the text box.
     *
     * @param g2  the graphics device.
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     * @param anchor  the anchor point.
     */
    public void draw(Graphics2D g2, float x, float y, RectangleAnchor anchor) {
        final Size2D d1 = this.textBlock.calculateDimensions(g2);
        final double w = this.interiorGap.extendWidth(d1.getWidth());
        final double h = this.interiorGap.extendHeight(d1.getHeight());
        final Size2D d2 = new Size2D(w, h);
        final Rectangle2D bounds
                = RectangleAnchor.createRectangle(d2, x, y, anchor);
        double xx = bounds.getX();
        double yy = bounds.getY();

        if (this.shadowPaint != null) {
            final Rectangle2D shadow = new Rectangle2D.Double(
                xx + this.shadowXOffset, yy + this.shadowYOffset,
                bounds.getWidth(), bounds.getHeight());
            g2.setPaint(this.shadowPaint);
            g2.fill(shadow);
        }
        if (this.backgroundPaint != null) {
            g2.setPaint(this.backgroundPaint);
            g2.fill(bounds);
        }

        if (this.outlinePaint != null && this.outlineStroke != null) {
            g2.setPaint(this.outlinePaint);
            g2.setStroke(this.outlineStroke);
            g2.draw(bounds);
        }

        this.textBlock.draw(g2,
                (float) (xx + this.interiorGap.calculateLeftInset(w)),
                (float) (yy + this.interiorGap.calculateTopInset(h)),
                TextBlockAnchor.TOP_LEFT);

    }

    /**
     * Returns the height of the text box.
     *
     * @param g2  the graphics device.
     *
     * @return The height (in Java2D units).
     */
    public double getHeight(Graphics2D g2) {
        final Size2D d = this.textBlock.calculateDimensions(g2);
        return this.interiorGap.extendHeight(d.getHeight());
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the object to test against ({@code null} permitted).
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof TextBox)) {
            return false;
        }
        final TextBox that = (TextBox) obj;
        if (!Objects.equals(this.outlinePaint, that.outlinePaint)) {
            return false;
        }
        if (!Objects.equals(this.outlineStroke, that.outlineStroke)) {
            return false;
        }
        if (!Objects.equals(this.interiorGap, that.interiorGap)) {
            return false;
        }
        if (!Objects.equals(this.backgroundPaint, that.backgroundPaint)) {
            return false;
        }
        if (!Objects.equals(this.shadowPaint, that.shadowPaint)) {
            return false;
        }
        if (this.shadowXOffset != that.shadowXOffset) {
            return false;
        }
        if (this.shadowYOffset != that.shadowYOffset) {
            return false;
        }
        if (!Objects.equals(this.textBlock, that.textBlock)) {
            return false;
        }

        return true;
    }

    /**
     * Returns a hash code for this object.
     *
     * @return A hash code.
     */
    @Override
    public int hashCode() {
        int result;
        long temp;
        result = (this.outlinePaint != null ? this.outlinePaint.hashCode() : 0);
        result = 29 * result + (this.outlineStroke != null
                ? this.outlineStroke.hashCode() : 0);
        result = 29 * result + (this.interiorGap != null
                ? this.interiorGap.hashCode() : 0);
        result = 29 * result + (this.backgroundPaint != null
                ? this.backgroundPaint.hashCode() : 0);
        result = 29 * result + (this.shadowPaint != null
                ? this.shadowPaint.hashCode() : 0);
        temp = this.shadowXOffset != +0.0d
                ? Double.doubleToLongBits(this.shadowXOffset) : 0L;
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        temp = this.shadowYOffset != +0.0d
                ? Double.doubleToLongBits(this.shadowYOffset) : 0L;
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        result = 29 * result + (this.textBlock != null
                ? this.textBlock.hashCode() : 0);
        return result;
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtils.writePaint(this.outlinePaint, stream);
        SerialUtils.writeStroke(this.outlineStroke, stream);
        SerialUtils.writePaint(this.backgroundPaint, stream);
        SerialUtils.writePaint(this.shadowPaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream) throws IOException, 
            ClassNotFoundException {
        stream.defaultReadObject();
        this.outlinePaint = SerialUtils.readPaint(stream);
        this.outlineStroke = SerialUtils.readStroke(stream);
        this.backgroundPaint = SerialUtils.readPaint(stream);
        this.shadowPaint = SerialUtils.readPaint(stream);
    }

}