content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.stress.graph;
  
  import com.google.common.collect.ImmutableMap;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  /**
   * A line graph representation.
   */
  public class LineGraph extends Graph {
    private static final String X_FIELD = "x";
    private static final String Y_FIELD = "y";
    private static final String SERIES_FIELD = "series";
  
    private static final int POINT_SIZE = 81;
    private static final Object CONDITIONAL_OPACITY = ImmutableMap.of("opacity", ImmutableMap
        .of("condition", ImmutableMap.of("selection", "legendSelect", "value", 1), "value", 0.05));
    private static final Object LEGEND_CONFIG = ImmutableMap.of("columns", 3, "symbolLimit", 500);
  
    /**
     * This represents the data for a line graph.
     */
    public static final class Data {
      private final List<Map<Object, Object>> mData;
  
      /**
       * Creates an instance.
       */
      public Data() {
        mData = new ArrayList<>();
      }
  
      /**
       * @param x the x value
       * @param y the y value
       */
      public void addData(Object x, Object y) {
        mData.add(ImmutableMap.of(LineGraph.X_FIELD, x, LineGraph.Y_FIELD, y));
      }
    }
  
    /**
     * Creates an instance.
     *
     * @param title the title
     * @param subTitle the lines in the sub title
     * @param xTitle the title of the x-axis
     * @param yTitle the title of the y-axis
     */
    public LineGraph(String title, List<String> subTitle, String xTitle, String yTitle) {
      mTitle.add(title);
      mSubTitle.addAll(subTitle);
  
      mGraph.put("$schema", "https://vega.github.io/schema/vega-lite/v4.json");
      mGraph.put("width", 700);
      mGraph.put("height", 400);
      mGraph.put("title", ImmutableMap.of("text", mTitle, "subtitle", mSubTitle));
  
      // TODO(gpang): is this the best we can do to build out this map/json?
      Map<String, Object> encoding = new HashMap<>();
      // TODO(gpang): customize the type
      encoding.put("x", ImmutableMap.of("field", X_FIELD, "type", "ordinal", "title", xTitle));
      encoding.put("y",
          ImmutableMap.of("field", Y_FIELD, "type", "quantitative", "title", yTitle));
      encoding.put("tooltip", Arrays
          .asList(ImmutableMap.of("field", SERIES_FIELD, "type", "nominal", "title", "Series"),
              ImmutableMap.of("field", X_FIELD, "type", "ordinal", "title", xTitle),
              ImmutableMap.of("field", Y_FIELD, "type", "quantitative", "title", yTitle)));
      encoding.put("color",
          ImmutableMap.of("field", SERIES_FIELD, "type", "nominal", "legend", LEGEND_CONFIG));
      encoding.put("strokeWidth", ImmutableMap.of("value", 3));
      mGraph.put("encoding", encoding);
  
      List<Object> layer = new ArrayList<>();
      // This layer is for the transparent points and the selection
      layer.add(ImmutableMap
          .of("mark", ImmutableMap.of("type", "point", "size", POINT_SIZE, "stroke", "transparent"),
              "selection", ImmutableMap.of("legendSelect", ImmutableMap
                  .of("type", "multi", "bind", "legend", "fields", new String[] {SERIES_FIELD}))));
      // This layer is for the line (without points)
      layer.add(ImmutableMap.of("mark", "line", "encoding", CONDITIONAL_OPACITY));
      // This layer is for the points
      layer.add(ImmutableMap
          .of("mark",
              ImmutableMap.of("type", "point", "size", POINT_SIZE, "filled", false, "fill", "white"),
              "encoding", CONDITIONAL_OPACITY));
      mGraph.put("layer", layer);
  
      mGraph.put("config", ImmutableMap.of("legend",
          ImmutableMap.of("orient", "bottom", "direction", "vertical", "labelLimit", 700)));
    }
  
    /**
     * @param series the series name
     * @param data the series data to add
     */
    public void addDataSeries(String series, LineGraph.Data data) {
      List<Map<Object, Object>> newSeries =
          data.mData.stream().map(m -> {
            Map<Object, Object> newMap = new HashMap<>(m);
            newMap.put(LineGraph.SERIES_FIELD, series);
            return newMap;
          }).collect(Collectors.toList());
      mData.addAll(newSeries);
    }
  }
  