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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
   ==================================================================== */

package org.apache.poi.xssf.usermodel.charts;

import java.util.ArrayList;
import java.util.List;

import org.apache.poi.ss.usermodel.Chart;
import org.apache.poi.ss.usermodel.charts.ChartAxis;
import org.apache.poi.ss.usermodel.charts.ChartDataSource;
import org.apache.poi.ss.usermodel.charts.ScatterChartData;
import org.apache.poi.ss.usermodel.charts.ScatterChartSeries;
import org.apache.poi.util.Beta;
import org.apache.poi.xssf.usermodel.XSSFChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTAxDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTPlotArea;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTScatterChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTScatterSer;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTScatterStyle;
import org.openxmlformats.schemas.drawingml.x2006.chart.STScatterStyle;


/**
 * Represents DrawingML scatter charts.
 */
@Beta
public class XSSFScatterChartData implements ScatterChartData {

    /**
     * List of all data series.
     */
    private List series;

    public XSSFScatterChartData() {
        series = new ArrayList();
    }

    /**
     * Package private ScatterChartSerie implementation.
     */
    static class Series extends AbstractXSSFChartSeries implements ScatterChartSeries {
        private int id;
        private int order;
        private ChartDataSource xs;
        private ChartDataSource ys;

        protected Series(int id, int order,
                        ChartDataSource xs,
                        ChartDataSource ys) {
            super();
            this.id = id;
            this.order = order;
            this.xs = xs;
            this.ys = ys;
        }

        /**
         * Returns data source used for X axis values.
         * @return data source used for X axis values
         */
        public ChartDataSource getXValues() {
            return xs;
        }

        /**
         * Returns data source used for Y axis values.
         * @return data source used for Y axis values
         */
        public ChartDataSource getYValues() {
            return ys;
        }

        protected void addToChart(CTScatterChart ctScatterChart) {
            CTScatterSer scatterSer = ctScatterChart.addNewSer();
            scatterSer.addNewIdx().setVal(this.id);
            scatterSer.addNewOrder().setVal(this.order);

            CTAxDataSource xVal = scatterSer.addNewXVal();
            XSSFChartUtil.buildAxDataSource(xVal, xs);

            CTNumDataSource yVal = scatterSer.addNewYVal();
            XSSFChartUtil.buildNumDataSource(yVal, ys);

			if (isTitleSet()) {
				scatterSer.setTx(getCTSerTx());
			}
        }
    }

    public ScatterChartSeries addSerie(ChartDataSource xs,
                                      ChartDataSource ys) {
        if (!ys.isNumeric()) {
            throw new IllegalArgumentException("Y axis data source must be numeric.");
        }
        int numOfSeries = series.size();
        Series newSerie = new Series(numOfSeries, numOfSeries, xs, ys);
        series.add(newSerie);
        return newSerie;
    }

    public void fillChart(Chart chart, ChartAxis... axis) {
        if (!(chart instanceof XSSFChart)) {
            throw new IllegalArgumentException("Chart must be instance of XSSFChart");
        }

        XSSFChart xssfChart = (XSSFChart) chart;
        CTPlotArea plotArea = xssfChart.getCTChart().getPlotArea();
        CTScatterChart scatterChart = plotArea.addNewScatterChart();
        addStyle(scatterChart);

        for (Series s : series) {
            s.addToChart(scatterChart);
        }

        for (ChartAxis ax : axis) {
            scatterChart.addNewAxId().setVal(ax.getId());
        }
    }

    public List getSeries() {
        return series;
    }

    private void addStyle(CTScatterChart ctScatterChart) {
        CTScatterStyle scatterStyle = ctScatterChart.addNewScatterStyle();
        scatterStyle.setVal(STScatterStyle.LINE_MARKER);
    }
}