/* ===========================================================
 * 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.]
 *
 * -----------------------
 * XYSeriesCollection.java
 * -----------------------
 * (C) Copyright 2001-present, by David Gilbert and Contributors.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   Aaron Metzger;
 *
 */

package org.jfree.data.xy;

import org.jfree.chart.HashUtils;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.ObjectUtils;
import org.jfree.chart.util.PublicCloneable;
import org.jfree.data.*;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.Series;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

/**
 * Represents a collection of {@link XYSeries} objects that can be used as a
 * dataset.
 */
public class XYSeriesCollection extends AbstractIntervalXYDataset
        implements IntervalXYDataset, DomainInfo, RangeInfo, 
        VetoableChangeListener, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -7590013825931496766L;

    /** The series that are included in the collection. */
    private List data;

    /** The interval delegate (used to calculate the start and end x-values). */
    private IntervalXYDelegate intervalDelegate;

    /**
     * Constructs an empty dataset.
     */
    public XYSeriesCollection() {
        this(null);
    }

    /**
     * Constructs a dataset and populates it with a single series.
     *
     * @param series  the series ({@code null} ignored).
     */
    public XYSeriesCollection(XYSeries series) {
        this.data = new java.util.ArrayList();
        this.intervalDelegate = new IntervalXYDelegate(this, false);
        addChangeListener(this.intervalDelegate);
        if (series != null) {
            this.data.add(series);
            series.addChangeListener(this);
            series.addVetoableChangeListener(this);
        }
    }

    /**
     * Returns the order of the domain (X) values, if this is known.
     *
     * @return The domain order.
     */
    @Override
    public DomainOrder getDomainOrder() {
        int seriesCount = getSeriesCount();
        for (int i = 0; i < seriesCount; i++) {
            XYSeries s = getSeries(i);
            if (!s.getAutoSort()) {
                return DomainOrder.NONE;  // we can't be sure of the order
            }
        }
        return DomainOrder.ASCENDING;
    }

    /**
     * Adds a series to the collection and sends a {@link DatasetChangeEvent}
     * to all registered listeners.
     *
     * @param series  the series ({@code null} not permitted).
     * 
     * @throws IllegalArgumentException if the key for the series is null or
     *     not unique within the dataset.
     */
    public void addSeries(XYSeries series) {
        Args.nullNotPermitted(series, "series");
        if (getSeriesIndex(series.getKey()) >= 0) {
            throw new IllegalArgumentException(
                "This dataset already contains a series with the key " 
                + series.getKey());
        }
        this.data.add(series);
        series.addChangeListener(this);
        series.addVetoableChangeListener(this);
        fireDatasetChanged();
    }

    /**
     * Removes a series from the collection and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero-based).
     */
    public void removeSeries(int series) {
        if ((series < 0) || (series >= getSeriesCount())) {
            throw new IllegalArgumentException("Series index out of bounds.");
        }
        XYSeries s = (XYSeries) this.data.get(series);
        if (s != null) {
            removeSeries(s);
        }
    }

    /**
     * Removes a series from the collection and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param series  the series ({@code null} not permitted).
     */
    public void removeSeries(XYSeries series) {
        Args.nullNotPermitted(series, "series");
        if (this.data.contains(series)) {
            series.removeChangeListener(this);
            series.removeVetoableChangeListener(this);
            this.data.remove(series);
            fireDatasetChanged();
        }
    }

    /**
     * Removes all the series from the collection and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     */
    public void removeAllSeries() {
        // Unregister the collection as a change listener to each series in
        // the collection.
        for (Object item : this.data) {
            XYSeries series = (XYSeries) item;
            series.removeChangeListener(this);
            series.removeVetoableChangeListener(this);
        }

        // Remove all the series from the collection and notify listeners.
        this.data.clear();
        fireDatasetChanged();
    }

    /**
     * Returns the number of series in the collection.
     *
     * @return The series count.
     */
    @Override
    public int getSeriesCount() {
        return this.data.size();
    }

    /**
     * Returns a list of all the series in the collection.
     *
     * @return The list (which is unmodifiable).
     */
    public List getSeries() {
        return Collections.unmodifiableList(this.data);
    }

    /**
     * Returns the index of the specified series, or -1 if that series is not
     * present in the dataset.
     *
     * @param series  the series ({@code null} not permitted).
     *
     * @return The series index.
     */
    public int indexOf(XYSeries series) {
        Args.nullNotPermitted(series, "series");
        return this.data.indexOf(series);
    }

    /**
     * Returns a series from the collection.
     *
     * @param series  the series index (zero-based).
     *
     * @return The series.
     *
     * @throws IllegalArgumentException if {@code series} is not in the
     *     range {@code 0} to {@code getSeriesCount() - 1}.
     */
    public XYSeries getSeries(int series) {
        if ((series < 0) || (series >= getSeriesCount())) {
            throw new IllegalArgumentException("Series index out of bounds");
        }
        return (XYSeries) this.data.get(series);
    }

    /**
     * Returns a series from the collection.
     *
     * @param key  the key ({@code null} not permitted).
     *
     * @return The series with the specified key.
     *
     * @throws UnknownKeyException if {@code key} is not found in the
     *         collection.
     */
    public XYSeries getSeries(Comparable key) {
        Args.nullNotPermitted(key, "key");
        for (Object item : this.data) {
            XYSeries series = (XYSeries) item;
            if (key.equals(series.getKey())) {
                return series;
            }
        }
        throw new UnknownKeyException("Key not found: " + key);
    }

    /**
     * Returns the key for a series.
     *
     * @param series  the series index (in the range {@code 0} to
     *     {@code getSeriesCount() - 1}).
     *
     * @return The key for a series.
     *
     * @throws IllegalArgumentException if {@code series} is not in the
     *     specified range.
     */
    @Override
    public Comparable getSeriesKey(int series) {
        // defer argument checking
        return getSeries(series).getKey();
    }

    /**
     * Returns the index of the series with the specified key, or -1 if no
     * series has that key.
     * 
     * @param key  the key ({@code null} not permitted).
     * 
     * @return The index.
     */
    public int getSeriesIndex(Comparable key) {
        Args.nullNotPermitted(key, "key");
        int seriesCount = getSeriesCount();
        for (int i = 0; i < seriesCount; i++) {
            XYSeries series = (XYSeries) this.data.get(i);
            if (key.equals(series.getKey())) {
                return i;
            }
        }
        return -1;
    }

    /**
     * Returns the number of items in the specified series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The item count.
     *
     * @throws IllegalArgumentException if {@code series} is not in the
     *     range {@code 0} to {@code getSeriesCount() - 1}.
     */
    @Override
    public int getItemCount(int series) {
        // defer argument checking
        return getSeries(series).getItemCount();
    }

    /**
     * Returns the x-value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The value.
     */
    @Override
    public Number getX(int series, int item) {
        XYSeries s = (XYSeries) this.data.get(series);
        return s.getX(item);
    }

    /**
     * Returns the starting X value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The starting X value.
     */
    @Override
    public Number getStartX(int series, int item) {
        return this.intervalDelegate.getStartX(series, item);
    }

    /**
     * Returns the ending X value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The ending X value.
     */
    @Override
    public Number getEndX(int series, int item) {
        return this.intervalDelegate.getEndX(series, item);
    }

    /**
     * Returns the y-value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param index  the index of the item of interest (zero-based).
     *
     * @return The value (possibly {@code null}).
     */
    @Override
    public Number getY(int series, int index) {
        XYSeries s = (XYSeries) this.data.get(series);
        return s.getY(index);
    }

    /**
     * Returns the starting Y value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The starting Y value.
     */
    @Override
    public Number getStartY(int series, int item) {
        return getY(series, item);
    }

    /**
     * Returns the ending Y value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The ending Y value.
     */
    @Override
    public Number getEndY(int series, int item) {
        return getY(series, item);
    }

    /**
     * Tests this collection for equality with an arbitrary object.
     *
     * @param obj  the object ({@code null} permitted).
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof XYSeriesCollection)) {
            return false;
        }
        XYSeriesCollection that = (XYSeriesCollection) obj;
        if (!this.intervalDelegate.equals(that.intervalDelegate)) {
            return false;
        }
        return Objects.equals(this.data, that.data);
    }

    /**
     * Returns a clone of this instance.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if there is a problem.
     */
    @Override
    public Object clone() throws CloneNotSupportedException {
        XYSeriesCollection clone = (XYSeriesCollection) super.clone();
        clone.data = (List) ObjectUtils.deepClone(this.data);
        clone.intervalDelegate
                = (IntervalXYDelegate) this.intervalDelegate.clone();
        return clone;
    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    @Override
    public int hashCode() {
        int hash = 5;
        hash = HashUtils.hashCode(hash, this.intervalDelegate);
        hash = HashUtils.hashCode(hash, this.data);
        return hash;
    }

    /**
     * Returns the minimum x-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether the
     *                         x-interval is taken into account.
     *
     * @return The minimum value.
     */
    @Override
    public double getDomainLowerBound(boolean includeInterval) {
        if (includeInterval) {
            return this.intervalDelegate.getDomainLowerBound(includeInterval);
        }
        double result = Double.NaN;
        int seriesCount = getSeriesCount();
        for (int s = 0; s < seriesCount; s++) {
            XYSeries series = getSeries(s);
            double lowX = series.getMinX();
            if (Double.isNaN(result)) {
                result = lowX;
            }
            else {
                if (!Double.isNaN(lowX)) {
                    result = Math.min(result, lowX);
                }
            }
        }
        return result;
    }

    /**
     * Returns the maximum x-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether the
     *                         x-interval is taken into account.
     *
     * @return The maximum value.
     */
    @Override
    public double getDomainUpperBound(boolean includeInterval) {
        if (includeInterval) {
            return this.intervalDelegate.getDomainUpperBound(includeInterval);
        }
        else {
            double result = Double.NaN;
            int seriesCount = getSeriesCount();
            for (int s = 0; s < seriesCount; s++) {
                XYSeries series = getSeries(s);
                double hiX = series.getMaxX();
                if (Double.isNaN(result)) {
                    result = hiX;
                }
                else {
                    if (!Double.isNaN(hiX)) {
                        result = Math.max(result, hiX);
                    }
                }
            }
            return result;
        }
    }

    /**
     * Returns the range of the values in this dataset's domain.
     *
     * @param includeInterval  a flag that determines whether the
     *                         x-interval is taken into account.
     *
     * @return The range (or {@code null} if the dataset contains no
     *     values).
     */
    @Override
    public Range getDomainBounds(boolean includeInterval) {
        if (includeInterval) {
            return this.intervalDelegate.getDomainBounds(includeInterval);
        }
        else {
            double lower = Double.POSITIVE_INFINITY;
            double upper = Double.NEGATIVE_INFINITY;
            int seriesCount = getSeriesCount();
            for (int s = 0; s < seriesCount; s++) {
                XYSeries series = getSeries(s);
                double minX = series.getMinX();
                if (!Double.isNaN(minX)) {
                    lower = Math.min(lower, minX);
                }
                double maxX = series.getMaxX();
                if (!Double.isNaN(maxX)) {
                    upper = Math.max(upper, maxX);
                }
            }
            if (lower > upper) {
                return null;
            }
            else {
                return new Range(lower, upper);
            }
        }
    }

    /**
     * Returns the interval width. This is used to calculate the start and end
     * x-values, if/when the dataset is used as an {@link IntervalXYDataset}.
     *
     * @return The interval width.
     */
    public double getIntervalWidth() {
        return this.intervalDelegate.getIntervalWidth();
    }

    /**
     * Sets the interval width and sends a {@link DatasetChangeEvent} to all
     * registered listeners.
     *
     * @param width  the width (negative values not permitted).
     */
    public void setIntervalWidth(double width) {
        if (width < 0.0) {
            throw new IllegalArgumentException("Negative 'width' argument.");
        }
        this.intervalDelegate.setFixedIntervalWidth(width);
        fireDatasetChanged();
    }

    /**
     * Returns the interval position factor.
     *
     * @return The interval position factor.
     */
    public double getIntervalPositionFactor() {
        return this.intervalDelegate.getIntervalPositionFactor();
    }

    /**
     * Sets the interval position factor. This controls where the x-value is in
     * relation to the interval surrounding the x-value (0.0 means the x-value
     * will be positioned at the start, 0.5 in the middle, and 1.0 at the end).
     *
     * @param factor  the factor.
     */
    public void setIntervalPositionFactor(double factor) {
        this.intervalDelegate.setIntervalPositionFactor(factor);
        fireDatasetChanged();
    }

    /**
     * Returns whether the interval width is automatically calculated or not.
     *
     * @return Whether the width is automatically calculated or not.
     */
    public boolean isAutoWidth() {
        return this.intervalDelegate.isAutoWidth();
    }

    /**
     * Sets the flag that indicates whether the interval width is automatically
     * calculated or not.
     *
     * @param b  a boolean.
     */
    public void setAutoWidth(boolean b) {
        this.intervalDelegate.setAutoWidth(b);
        fireDatasetChanged();
    }

    /**
     * Returns the range of the values in this dataset's range.
     *
     * @param includeInterval  ignored.
     *
     * @return The range (or {@code null} if the dataset contains no
     *     values).
     */
    @Override
    public Range getRangeBounds(boolean includeInterval) {
        double lower = Double.POSITIVE_INFINITY;
        double upper = Double.NEGATIVE_INFINITY;
        int seriesCount = getSeriesCount();
        for (int s = 0; s < seriesCount; s++) {
            XYSeries series = getSeries(s);
            double minY = series.getMinY();
            if (!Double.isNaN(minY)) {
                lower = Math.min(lower, minY);
            }
            double maxY = series.getMaxY();
            if (!Double.isNaN(maxY)) {
                upper = Math.max(upper, maxY);
            }
        }
        if (lower > upper) {
            return null;
        }
        else {
            return new Range(lower, upper);
        }
    }

    /**
     * Returns the minimum y-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether the
     *                         y-interval is taken into account.
     *
     * @return The minimum value.
     */
    @Override
    public double getRangeLowerBound(boolean includeInterval) {
        double result = Double.NaN;
        int seriesCount = getSeriesCount();
        for (int s = 0; s < seriesCount; s++) {
            XYSeries series = getSeries(s);
            double lowY = series.getMinY();
            if (Double.isNaN(result)) {
                result = lowY;
            }
            else {
                if (!Double.isNaN(lowY)) {
                    result = Math.min(result, lowY);
                }
            }
        }
        return result;
    }

    /**
     * Returns the maximum y-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether the
     *                         y-interval is taken into account.
     *
     * @return The maximum value.
     */
    @Override
    public double getRangeUpperBound(boolean includeInterval) {
        double result = Double.NaN;
        int seriesCount = getSeriesCount();
        for (int s = 0; s < seriesCount; s++) {
            XYSeries series = getSeries(s);
            double hiY = series.getMaxY();
            if (Double.isNaN(result)) {
                result = hiY;
            }
            else {
                if (!Double.isNaN(hiY)) {
                    result = Math.max(result, hiY);
                }
            }
        }
        return result;
    }

    /**
     * Receives notification that the key for one of the series in the 
     * collection has changed, and vetos it if the key is already present in 
     * the collection.
     * 
     * @param e  the event.
     * 
     * @throws PropertyVetoException  if the series name is already present in 
     *     the collection.
     */
    @Override
    public void vetoableChange(PropertyChangeEvent e) throws PropertyVetoException {
        // if it is not the series name, then we have no interest
        if (!"Key".equals(e.getPropertyName())) {
            return;
        }
        
        // to be defensive, let's check that the source series does in fact
        // belong to this collection
        Series s = (Series) e.getSource();
        if (getSeriesIndex(s.getKey()) == -1) {
            throw new IllegalStateException("Receiving events from a series " +
                    "that does not belong to this collection.");
        }
        // check if the new series name already exists for another series
        Comparable key = (Comparable) e.getNewValue();
        if (getSeriesIndex(key) >= 0) {
            throw new PropertyVetoException("Duplicate key2", e);
        }
    }

    /**
     * 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();
    }

    /**
     * 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();
        for (Object item : this.data) {
            XYSeries series = (XYSeries) item;
            series.addChangeListener(this);
        }
    }

}