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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.examples.xslf;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xddf.usermodel.chart.XDDFChartData;
import org.apache.poi.xddf.usermodel.chart.XDDFDataSource;
import org.apache.poi.xddf.usermodel.chart.XDDFDataSourcesFactory;
import org.apache.poi.xddf.usermodel.chart.XDDFNumericalDataSource;
import org.apache.poi.xddf.usermodel.chart.XDDFPieChartData;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.apache.poi.xslf.usermodel.XSLFChart;
import org.apache.poi.xslf.usermodel.XSLFSlide;

/**
 * Build a pie chart from a template pptx
 */
@SuppressWarnings({"java:S106","java:S4823","java:S1192"})
public final class PieChartDemo {
    private PieChartDemo() {}

    private static void usage(){
        System.out.println("Usage: PieChartDemo  ");
        System.out.println("    pie-chart-template.pptx     template with a pie chart");
        System.out.println("    pie-chart-data.txt          the model to set. First line is chart title, " +
                "then go pairs {axis-label value}");
    }

    public static void main(String[] args) throws Exception {
        if(args.length < 2) {
            usage();
            return;
        }

        try (FileInputStream argIS = new FileInputStream(args[0]);
             BufferedReader modelReader = Files.newBufferedReader(Paths.get(args[1]), StandardCharsets.UTF_8)) {
            String chartTitle = modelReader.readLine();  // first line is chart title

            try (XMLSlideShow pptx = new XMLSlideShow(argIS)) {
                XSLFSlide slide = pptx.getSlides().get(0);

                // find chart in the slide
                XSLFChart chart = null;
                for (POIXMLDocumentPart part : slide.getRelations()) {
                    if (part instanceof XSLFChart) {
                        chart = (XSLFChart) part;
                        break;
                    }
                }

                if(chart == null) {
                    throw new IllegalStateException("chart not found in the template");
                }

                // Series Text
                List series = chart.getChartSeries();
                XDDFPieChartData pie = (XDDFPieChartData) series.get(0);

                // Category Axis Data
                List listCategories = new ArrayList<>(3);

                // Values
                List listValues = new ArrayList<>(3);

                // set model
                String ln;
                while((ln = modelReader.readLine()) != null){
                    String[] vals = ln.split("\\s+");
                    listCategories.add(vals[0]);
                    listValues.add(Double.valueOf(vals[1]));
                }
                String[] categories = listCategories.toArray(new String[0]);
                Double[] values = listValues.toArray(new Double[0]);

                final int numOfPoints = categories.length;
                final String categoryDataRange = chart.formatRange(new CellRangeAddress(1, numOfPoints, 0, 0));
                final String valuesDataRange = chart.formatRange(new CellRangeAddress(1, numOfPoints, 1, 1));
                final XDDFDataSource categoriesData = XDDFDataSourcesFactory.fromArray(categories, categoryDataRange);
                final XDDFNumericalDataSource valuesData = XDDFDataSourcesFactory.fromArray(values, valuesDataRange);

                XDDFPieChartData.Series firstSeries = (XDDFPieChartData.Series) pie.getSeries(0);
                firstSeries.replaceData(categoriesData, valuesData);
                firstSeries.setTitle(chartTitle, chart.setSheetTitle(chartTitle, 0));
                firstSeries.setExplosion(25L);
                firstSeries.getDataPoint(1).setExplosion(35L);
                chart.plot(pie);

                // save the result
                try (OutputStream out = new FileOutputStream("pie-chart-demo-output.pptx")) {
                    pptx.write(out);
                }
            }
        }
    }
}