grafana/public/app/plugins/panel/heatmap/suggestions.ts

import { VisualizationSuggestionsBuilder } from '@grafana/data';
import { config } from '@grafana/runtime';

import { prepareHeatmapData } from './fields';
import { quantizeScheme } from './palettes';
import { Options, defaultOptions } from './types';

export class HeatmapSuggestionsSupplier {
  getSuggestionsForData(builder: VisualizationSuggestionsBuilder) {
    const { dataSummary } = builder;

    if (
      !builder.data?.series ||
      !dataSummary.hasData ||
      dataSummary.timeFieldCount < 1 ||
      dataSummary.numberFieldCount < 2 ||
      dataSummary.numberFieldCount > 10
    ) {
      return;
    }

    const palette = quantizeScheme(defaultOptions.color, config.theme2);
    const info = prepareHeatmapData(builder.data.series, undefined, defaultOptions, palette, config.theme2);
    if (!info || info.warning) {
      return;
    }

    builder.getListAppender<Options, {}>({
      name: '',
      pluginId: 'heatmap',
      options: {},
      fieldConfig: {
        defaults: {
          custom: {},
        },
        overrides: [],
      },
    });
  }
}