EDIT

/**

* Copyright (C) 2018 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.editor.descriptiveDataSet.matrix;

import java.util.List;

import org.eclipse.jface.window.ToolTip;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.Point;

import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Event;

import org.eclipse.swt.widgets.Label;

import org.swtchart.Chart;

import org.swtchart.IAxis;

import org.swtchart.IBarSeries;

import org.swtchart.ISeries.SeriesType;

import org.swtchart.ISeriesLabel;

import eu.etaxonomy.cdm.model.description.Feature;

import eu.etaxonomy.cdm.model.description.State;

import eu.etaxonomy.taxeditor.editor.l10n.Messages;

/**

 * @author pplitzner

 * @since Jul 6, 2018

 *

 */

public class CategoricalChartTooltip extends ToolTip {

    static final String TOOLTIP_NOT_AVAILABLE = Messages.CategoricalChartTooltip_TOOLTIP_NOT_AVAILABLE;

    private CharacterMatrix matrix;

    public CategoricalChartTooltip(CharacterMatrix matrix) {

        super(matrix.getNatTable(), ToolTip.NO_RECREATE, false);

        this.matrix = matrix;

    }

    @Override

    protected Object getToolTipArea(Event event) {

        int col = matrix.getNatTable().getColumnPositionByX(event.x);

        int row = matrix.getNatTable().getRowPositionByY(event.y);

        return new Point(col, row);

    }

    @Override

    protected Composite createToolTipContentArea(Event event,

            Composite parent) {

        int colPos = matrix.getNatTable().getColumnPositionByX(event.x);

        int colIndex = matrix.getNatTable().getColumnIndexByPosition(colPos);

        Feature feature = matrix.getIndexToFeatureMap().get(colIndex);

        CategoricalDataHistogram histogram = matrix.getFeatureToHistogramMap().get(feature);

        Composite tooltip;

        if(histogram!=null && !histogram.getStates().isEmpty()){

            parent.setLayout(new GridLayout());

            tooltip = createTooltip(event, parent);

        }

        else{

            tooltip = new Composite(parent, SWT.NONE);

            tooltip.setLayout(new FillLayout());

            Label label = new Label(tooltip, SWT.NONE);

            label.setText(TOOLTIP_NOT_AVAILABLE);

        }

        return tooltip;

    }

    private Composite createTooltip(Event event, Composite parent) {

        Chart chart = new Chart(parent, SWT.NONE);

        chart.setLayoutData(new GridData(600, 300));

        //get histogram for column

        int colPos = matrix.getNatTable().getColumnPositionByX(event.x);

        int colIndex = matrix.getNatTable().getColumnIndexByPosition(colPos);

        Feature feature = matrix.getIndexToFeatureMap().get(colIndex);

        CategoricalDataHistogram histogram = matrix.getFeatureToHistogramMap().get(feature);

        // set chart title

        chart.getTitle().setText(feature.getLabel());

        IAxis xAxis = chart.getAxisSet().getXAxis(0);

        //initalize x and y axis values

        List<State> statesList = histogram.getStates();

        String[] states = new String[statesList.size()];

        double[] counts = new double[statesList.size()];

        int index = 0;

        for (State state : statesList) {

            states[index] = state.getLabel();

            counts[index] = histogram.getCount(state);

            index++;

        }

        xAxis.setCategorySeries(states);

        xAxis.enableCategory(true);

        xAxis.getTitle().setVisible(false);

        xAxis.getTick().setTickLabelAngle(25);

        IAxis yAxis = chart.getAxisSet().getYAxis(0);

        yAxis.getTitle().setVisible(false);

        chart.getLegend().setVisible(false);

        IBarSeries barSeries = (IBarSeries) chart.getSeriesSet()

            .createSeries(SeriesType.BAR, "state counts"); //$NON-NLS-1$

        ISeriesLabel seriesLabel = barSeries.getLabel();

        seriesLabel.setVisible(true);

        barSeries.setYSeries(counts);

        chart.getAxisSet().adjustRange();

        return chart;

    }

    @Override

    protected boolean shouldCreateToolTip(Event event) {

        //Differentiation between "index" and "position" is important here

        //"position" is the current visible index

        //"index" refers to the underlying data model

        int colPos = matrix.getNatTable().getColumnPositionByX(event.x);

        int colIndex = matrix.getNatTable().getColumnIndexByPosition(colPos);

        int rowPos = matrix.getNatTable().getRowPositionByY(event.y);

        Feature feature = matrix.getIndexToFeatureMap().get(colIndex);

        if(matrix.isShowTooltips()

                && rowPos==1

                && colIndex>=CharacterMatrix.LEADING_COLUMN_COUNT

                && feature!=null

                && feature.isSupportsCategoricalData()) {

            return true;

        }

        return false;

    }

}