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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.dashboardwidgets;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.auto.value.AutoValue;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.AggregationWidget;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.RandomUUIDProvider;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.TimeRange;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.ViewWidget;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.ViewWidgetPosition;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.Widget;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.WidgetPosition;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.viewwidgets.AggregationConfig;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.viewwidgets.Series;
import org.graylog.plugins.views.migrations.V20191125144500_MigrateDashboardsToViewsSupport.viewwidgets.VisualizationConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

@AutoValue
@JsonAutoDetect
@JsonIgnoreProperties(ignoreUnknown = true)
public abstract class StackedChartConfig extends WidgetConfigBase implements WidgetConfig {
    private static final Logger LOG = LoggerFactory.getLogger(StackedChartConfig.class);

    public abstract String interval();
    public abstract String renderer();
    public abstract String interpolation();
    public abstract List series();
    public abstract Optional streamId();

    @Override
    public Set toViewWidgets(Widget widget, RandomUUIDProvider randomUUIDProvider) {
        final Map> seriesByQuery = series().stream()
                .collect(Collectors.groupingBy(StackedSeries::query));
        final AggregationConfig.Builder configBuilderTemplate = AggregationConfig.builder()
                .rowPivots(timestampPivot(interval()))
                .visualization(mapRendererToVisualization(renderer()));

        if (seriesByQuery.size() > 1) {
            LOG.warn("Migrating dashboards to views: Encountered a stacked chart widget containing multiple distinct " +
                    "queries, splitting up into separate widgets. Read more about it here: " +
                    "https://github.com/Graylog2/graylog2-server/blob/master/UPGRADING.rst#upgrading-to-graylog-32x");
        }

        return seriesByQuery.entrySet().stream()
                .map(entry -> {
                    final String query = entry.getKey();
                    final List series = entry.getValue().stream()
                            .map(s -> Series.create(mapStatsFunction(s.statisticalFunction()), s.field()))
                            .collect(Collectors.toList());

                    final AggregationConfig.Builder configBuilder = configBuilderTemplate.series(series);

                    final AggregationWidget.Builder viewWidgetBuilder = AggregationWidget.builder()
                            .id(randomUUIDProvider.get())
                            .timerange(timerange())
                            .query(query)
                            .config(visualizationConfig().map(configBuilder::visualizationConfig).orElse(configBuilder).build());
                    return streamId().map(streamId -> viewWidgetBuilder.streams(Collections.singleton(streamId))).orElse(viewWidgetBuilder).build();
                }).collect(Collectors.toSet());
    }

    @Override
    public Map toViewWidgetPositions(Set viewWidgets, WidgetPosition widgetPosition) {
        if (viewWidgets.size() == 1) {
            return super.toViewWidgetPositions(viewWidgets, widgetPosition);
        }

        final List widgetList = viewWidgets.stream()
                .filter(viewWidget -> viewWidget instanceof AggregationWidget)
                .map(viewWidget -> (AggregationWidget)viewWidget)
                .collect(Collectors.toList());
        final AggregationWidget first = widgetList.get(0);

        final ViewWidgetPosition firstPosition = ViewWidgetPosition.builder()
                .col(widgetPosition.col())
                .row(widgetPosition.row())
                .height(widgetPosition.height())
                .width(widgetPosition.width())
                .build();

        return Collections.singletonMap(first.id(), firstPosition);
    }

    private Optional visualizationConfig() {
        return createVisualizationConfig(renderer(), interpolation());
    }

    @JsonCreator
    public static StackedChartConfig create(
            @JsonProperty("timerange") TimeRange timeRange,
            @JsonProperty("interval") String interval,
            @JsonProperty("renderer") String renderer,
            @JsonProperty("interpolation") String interpolation,
            @JsonProperty("series") List series,
            @JsonProperty("stream_id") @Nullable String streamId
    ) {
        return new AutoValue_StackedChartConfig(timeRange, interval, renderer, interpolation, series, Optional.ofNullable(streamId));
    }
}




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