fix(Radar): Radar chart normalisation (#33559)

Co-authored-by: Amaan Nawab <nelsondrew07@gmail.com>

superset-frontend/plugins/plugin-chart-echarts/src/Radar/utils.ts

@@ -0,0 +1,92 @@
+/**
+ * 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.
+ */
+/*
+ function for finding the max metric values among all series data for Radar Chart
+*/
+export const findGlobalMax = (
+  data: Record<string, unknown>[],
+  metrics: string[],
+): number => {
+  if (!data?.length || !metrics?.length) return 0;
+
+  return data.reduce((globalMax, row) => {
+    const rowMax = metrics.reduce((max, metric) => {
+      const value = row[metric];
+      return typeof value === 'number' &&
+        Number.isFinite(value) &&
+        !Number.isNaN(value)
+        ? Math.max(max, value)
+        : max;
+    }, 0);
+
+    return Math.max(globalMax, rowMax);
+  }, 0);
+};
+
+interface TooltipParams {
+  color: string;
+  name?: string;
+  value: number[];
+}
+
+interface TooltipMetricValue {
+  metric: string;
+  value: number;
+}
+
+export const renderNormalizedTooltip = (
+  params: TooltipParams,
+  metrics: string[],
+  getDenormalizedValue: (seriesName: string, value: string) => number,
+  metricsWithCustomBounds: Set<string>,
+): string => {
+  const { color, name = '', value: values } = params;
+  const seriesName = name || 'series0';
+
+  const colorDot = `<span style="display:inline-block;margin-right:5px;border-radius:50%;width:5px;height:5px;background-color:${color}"></span>`;
+
+  // Get metric values with denormalization if needed
+  const metricValues: TooltipMetricValue[] = metrics.map((metric, index) => {
+    const value = values[index];
+    const originalValue = metricsWithCustomBounds.has(metric)
+      ? value
+      : getDenormalizedValue(name, String(value));
+
+    return {
+      metric,
+      value: originalValue,
+    };
+  });
+
+  const tooltipRows = metricValues
+    .map(
+      ({ metric, value }) => `
+        <div style="display:flex;">
+          <div>${colorDot}${metric}:</div>
+          <div style="font-weight:bold;margin-left:auto;">${value}</div>
+        </div>
+      `,
+    )
+    .join('');
+
+  return `
+    <div style="font-weight:bold;margin-bottom:5px;">${seriesName}</div>
+    ${tooltipRows}
+  `;
+};