update for ragas

webapp/static/js/metric_presenter.js

@@ -69,9 +69,42 @@
     return "#dc2626";
   }
 
+  // 计算某指标本次相对上一次的涨跌信息，方向语义随指标而定
+  // （noise_sensitivity 越低越好：下降=改善）。
+  function deltaInfo(metricName, current, previous) {
+    const isNum = (v) => v !== null && v !== undefined && !Number.isNaN(Number(v));
+    if (!isNum(current) || !isNum(previous)) {
+      return { hasData: false, delta: null, improved: null, arrow: "", magnitude: "", cls: "delta-flat" };
+    }
+    const delta = Number(current) - Number(previous);
+    const rounded = Math.round(delta * 10000) / 10000;
+    const arrow = rounded > 0 ? "▲" : rounded < 0 ? "▼" : "→";
+    const magnitude = Math.abs(rounded).toFixed(2);
+    const improved = isLowerBetter(metricName) ? rounded < 0 : rounded > 0;
+    const cls = rounded === 0 ? "delta-flat" : improved ? "delta-good" : "delta-bad";
+    return { hasData: true, delta: rounded, improved, arrow, magnitude, cls };
+  }
+
+  // 返回指标的"达标阈值"（柱状图对比用，方向感知）。
+  // higher-better 指标：0.85；lower-better (noise_sensitivity)：0.15。
+  function passThreshold(metricName) {
+    return isLowerBetter(metricName) ? 0.15 : 0.85;
+  }
+
+  // 判断某指标的值是否达标。
+  function meetsTarget(metricName, value) {
+    if (value === null || value === undefined || Number.isNaN(Number(value))) return false;
+    const v = Number(value);
+    return isLowerBetter(metricName) ? v <= passThreshold(metricName) : v >= passThreshold(metricName);
+  }
+
   globalObj.MetricPresenter = {
     scoreClass,
     describeMetric,
     binColor,
+    isLowerBetter,
+    deltaInfo,
+    passThreshold,
+    meetsTarget,
   };
 })(window);