/* ===========================================================
 * 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.]
 *
 * -----------------------
 * TimeTableXYDataset.java
 * -----------------------
 * (C) Copyright 2004-present, by Andreas Schroeder and Contributors.
 *
 * Original Author:  Andreas Schroeder;
 * Contributor(s):   David Gilbert;
 *                   Rob Eden;
 *
 */

package org.jfree.data.time;

import java.util.Calendar;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.PublicCloneable;

import org.jfree.data.DefaultKeyedValues2D;
import org.jfree.data.DomainInfo;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.xy.AbstractIntervalXYDataset;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.TableXYDataset;

/**
 * A dataset for regular time periods that implements the
 * {@link TableXYDataset} interface.  Note that the {@link TableXYDataset}
 * interface requires all series to share the same set of x-values.  When
 * adding a new item {@code (x, y)} to one series, all other series
 * automatically get a new item {@code (x, null)} unless a non-null item
 * has already been specified.
 *
 * @see org.jfree.data.xy.TableXYDataset
 */
public class TimeTableXYDataset extends AbstractIntervalXYDataset
        implements Cloneable, PublicCloneable, IntervalXYDataset, DomainInfo,
                   TableXYDataset {

    /**
     * The data structure to store the values.  Each column represents
     * a series (elsewhere in JFreeChart rows are typically used for series,
     * but it doesn't matter that much since this data structure is private
     * and symmetrical anyway), each row contains values for the same
     * {@link RegularTimePeriod} (the rows are sorted into ascending order).
     */
    private DefaultKeyedValues2D values;

    /**
     * A flag that indicates that the domain is 'points in time'.  If this flag
     * is true, only the x-value (and not the x-interval) is used to determine
     * the range of values in the domain.
     */
    private boolean domainIsPointsInTime;

    /**
     * The point within each time period that is used for the X value when this
     * collection is used as an {@link org.jfree.data.xy.XYDataset}.  This can
     * be the start, middle or end of the time period.
     */
    private TimePeriodAnchor xPosition;

    /** A working calendar (to recycle) */
    private Calendar workingCalendar;

    /**
     * Creates a new dataset.
     */
    public TimeTableXYDataset() {
        // defer argument checking
        this(TimeZone.getDefault(), Locale.getDefault());
    }

    /**
     * Creates a new dataset with the given time zone.
     *
     * @param zone  the time zone to use ({@code null} not permitted).
     */
    public TimeTableXYDataset(TimeZone zone) {
        // defer argument checking
        this(zone, Locale.getDefault());
    }

    /**
     * Creates a new dataset with the given time zone and locale.
     *
     * @param zone  the time zone to use ({@code null} not permitted).
     * @param locale  the locale to use ({@code null} not permitted).
     */
    public TimeTableXYDataset(TimeZone zone, Locale locale) {
        Args.nullNotPermitted(zone, "zone");
        Args.nullNotPermitted(locale, "locale");
        this.values = new DefaultKeyedValues2D(true);
        this.workingCalendar = Calendar.getInstance(zone, locale);
        this.xPosition = TimePeriodAnchor.START;
    }

    /**
     * Returns a flag that controls whether the domain is treated as 'points in
     * time'.
     * <P>
     * This flag is used when determining the max and min values for the domain.
     * If true, then only the x-values are considered for the max and min
     * values.  If false, then the start and end x-values will also be taken
     * into consideration.
     *
     * @return The flag.
     *
     * @see #setDomainIsPointsInTime(boolean)
     */
    public boolean getDomainIsPointsInTime() {
        return this.domainIsPointsInTime;
    }

    /**
     * Sets a flag that controls whether the domain is treated as 'points in
     * time', or time periods.  A {@link DatasetChangeEvent} is sent to all
     * registered listeners.
     *
     * @param flag  the new value of the flag.
     *
     * @see #getDomainIsPointsInTime()
     */
    public void setDomainIsPointsInTime(boolean flag) {
        this.domainIsPointsInTime = flag;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Returns the position within each time period that is used for the X
     * value.
     *
     * @return The anchor position (never {@code null}).
     *
     * @see #setXPosition(TimePeriodAnchor)
     */
    public TimePeriodAnchor getXPosition() {
        return this.xPosition;
    }

    /**
     * Sets the position within each time period that is used for the X values,
     * then sends a {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param anchor  the anchor position ({@code null} not permitted).
     *
     * @see #getXPosition()
     */
    public void setXPosition(TimePeriodAnchor anchor) {
        Args.nullNotPermitted(anchor, "anchor");
        this.xPosition = anchor;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Adds a new data item to the dataset and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param period  the time period.
     * @param y  the value for this period.
     * @param seriesName  the name of the series to add the value.
     *
     * @see #remove(TimePeriod, Comparable)
     */
    public void add(TimePeriod period, double y, Comparable seriesName) {
        add(period, y, seriesName, true);
    }

    /**
     * Adds a new data item to the dataset and, if requested, sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param period  the time period ({@code null} not permitted).
     * @param y  the value for this period ({@code null} permitted).
     * @param seriesName  the name of the series to add the value
     *                    ({@code null} not permitted).
     * @param notify  whether dataset listener are notified or not.
     *
     * @see #remove(TimePeriod, Comparable, boolean)
     */
    public void add(TimePeriod period, Number y, Comparable seriesName,
                    boolean notify) {
        // here's a quirk - the API has been defined in terms of a plain
        // TimePeriod, which cannot make use of the timezone and locale
        // specified in the constructor...so we only do the time zone
        // pegging if the period is an instanceof RegularTimePeriod
        if (period instanceof RegularTimePeriod) {
            RegularTimePeriod p = (RegularTimePeriod) period;
            p.peg(this.workingCalendar);
        }
        this.values.addValue(y, period, seriesName);
        if (notify) {
            fireDatasetChanged();
        }
    }

    /**
     * Removes an existing data item from the dataset.
     *
     * @param period  the (existing!) time period of the value to remove
     *                ({@code null} not permitted).
     * @param seriesName  the (existing!) series name to remove the value
     *                    ({@code null} not permitted).
     *
     * @see #add(TimePeriod, double, Comparable)
     */
    public void remove(TimePeriod period, Comparable seriesName) {
        remove(period, seriesName, true);
    }

    /**
     * Removes an existing data item from the dataset and, if requested,
     * sends a {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param period  the (existing!) time period of the value to remove
     *                ({@code null} not permitted).
     * @param seriesName  the (existing!) series name to remove the value
     *                    ({@code null} not permitted).
     * @param notify  whether dataset listener are notified or not.
     *
     * @see #add(TimePeriod, double, Comparable)
     */
    public void remove(TimePeriod period, Comparable seriesName,
            boolean notify) {
        this.values.removeValue(period, seriesName);
        if (notify) {
            fireDatasetChanged();
        }
    }

    /**
     * Removes all data items from the dataset and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     */
    public void clear() {
        if (this.values.getRowCount() > 0) {
            this.values.clear();
            fireDatasetChanged();
        }
    }

    /**
     * Returns the time period for the specified item.  Bear in mind that all
     * series share the same set of time periods.
     *
     * @param item  the item index (0 &lt;= i &lt;= {@link #getItemCount()}).
     *
     * @return The time period.
     */
    public TimePeriod getTimePeriod(int item) {
        return (TimePeriod) this.values.getRowKey(item);
    }

    /**
     * Returns the number of items in ALL series.
     *
     * @return The item count.
     */
    @Override
    public int getItemCount() {
        return this.values.getRowCount();
    }

    /**
     * Returns the number of items in a series.  This is the same value
     * that is returned by {@link #getItemCount()} since all series
     * share the same x-values (time periods).
     *
     * @param series  the series (zero-based index, ignored).
     *
     * @return The number of items within the series.
     */
    @Override
    public int getItemCount(int series) {
        return getItemCount();
    }

    /**
     * Returns the number of series in the dataset.
     *
     * @return The series count.
     */
    @Override
    public int getSeriesCount() {
        return this.values.getColumnCount();
    }

    /**
     * Returns the key for a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The key for the series.
     */
    @Override
    public Comparable getSeriesKey(int series) {
        return this.values.getColumnKey(series);
    }

    /**
     * Returns the x-value for an item within a series.  The x-values may or
     * may not be returned in ascending order, that is up to the class
     * implementing the interface.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The x-value.
     */
    @Override
    public Number getX(int series, int item) {
        return getXValue(series, item);
    }

    /**
     * Returns the x-value (as a double primitive) for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    @Override
    public double getXValue(int series, int item) {
        TimePeriod period = (TimePeriod) this.values.getRowKey(item);
        return getXValue(period);
    }

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

    /**
     * Returns the start x-value (as a double primitive) for an item within
     * a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    @Override
    public double getStartXValue(int series, int item) {
        TimePeriod period = (TimePeriod) this.values.getRowKey(item);
        return period.getStart().getTime();
    }

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

    /**
     * Returns the end x-value (as a double primitive) for an item within
     * a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    @Override
    public double getEndXValue(int series, int item) {
        TimePeriod period = (TimePeriod) this.values.getRowKey(item);
        return period.getEnd().getTime();
    }

    /**
     * Returns the y-value for an item within a series.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The y-value (possibly {@code null}).
     */
    @Override
    public Number getY(int series, int item) {
        return this.values.getValue(item, series);
    }

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

    /**
     * Returns the x-value for a time period.
     *
     * @param period  the time period.
     *
     * @return The x-value.
     */
    private long getXValue(TimePeriod period) {
        long result = 0L;
        if (this.xPosition == TimePeriodAnchor.START) {
            result = period.getStart().getTime();
        }
        else if (this.xPosition == TimePeriodAnchor.MIDDLE) {
            long t0 = period.getStart().getTime();
            long t1 = period.getEnd().getTime();
            result = t0 + (t1 - t0) / 2L;
        }
        else if (this.xPosition == TimePeriodAnchor.END) {
            result = period.getEnd().getTime();
        }
        return result;
    }

    /**
     * Returns the minimum x-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether or not the
     *                         x-interval is taken into account.
     *
     * @return The minimum value.
     */
    @Override
    public double getDomainLowerBound(boolean includeInterval) {
        double result = Double.NaN;
        Range r = getDomainBounds(includeInterval);
        if (r != null) {
            result = r.getLowerBound();
        }
        return result;
    }

    /**
     * Returns the maximum x-value in the dataset.
     *
     * @param includeInterval  a flag that determines whether or not the
     *                         x-interval is taken into account.
     *
     * @return The maximum value.
     */
    @Override
    public double getDomainUpperBound(boolean includeInterval) {
        double result = Double.NaN;
        Range r = getDomainBounds(includeInterval);
        if (r != null) {
            result = r.getUpperBound();
        }
        return result;
    }

    /**
     * Returns the range of the values in this dataset's domain.
     *
     * @param includeInterval  a flag that controls whether or not the
     *                         x-intervals are taken into account.
     *
     * @return The range.
     */
    @Override
    public Range getDomainBounds(boolean includeInterval) {
        List keys = this.values.getRowKeys();
        if (keys.isEmpty()) {
            return null;
        }

        TimePeriod first = (TimePeriod) keys.get(0);
        TimePeriod last = (TimePeriod) keys.get(keys.size() - 1);

        if (!includeInterval || this.domainIsPointsInTime) {
            return new Range(getXValue(first), getXValue(last));
        }
        else {
            return new Range(first.getStart().getTime(),
                    last.getEnd().getTime());
        }
    }

    /**
     * Tests this dataset 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 TimeTableXYDataset)) {
            return false;
        }
        TimeTableXYDataset that = (TimeTableXYDataset) obj;
        if (this.domainIsPointsInTime != that.domainIsPointsInTime) {
            return false;
        }
        if (this.xPosition != that.xPosition) {
            return false;
        }
        if (!this.workingCalendar.getTimeZone().equals(
            that.workingCalendar.getTimeZone())
        ) {
            return false;
        }
        if (!this.values.equals(that.values)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of this dataset.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if the dataset cannot be cloned.
     */
    @Override
    public Object clone() throws CloneNotSupportedException {
        TimeTableXYDataset clone = (TimeTableXYDataset) super.clone();
        clone.values = (DefaultKeyedValues2D) this.values.clone();
        clone.workingCalendar = (Calendar) this.workingCalendar.clone();
        return clone;
    }

}
