feat(小宝预警): 增加日报证据与风险趋势

apps/web/lib/xiaobao-risk-trend.ts

@@ -13,3 +13,81 @@ export interface XiaobaoRiskSnapshot {
   confidence: number;
   createdAt: string;
 }
+
+export interface RiskTrendSummary {
+  direction: 'up' | 'down' | 'flat' | 'unknown';
+  delta: number;
+  summary: string;
+  pattern: 'continuous_rising' | 'continuous_falling' | 'score_delta' | 'stable' | 'unknown';
+}
+
+export function summarizeRiskTrend(snapshots: XiaobaoRiskSnapshot[]): RiskTrendSummary {
+  const sorted = [...snapshots].sort((a, b) => getSnapshotTime(a) - getSnapshotTime(b));
+  if (sorted.length < 2) {
+    return { direction: 'unknown', delta: 0, summary: 'No historical risk snapshots yet.', pattern: 'unknown' };
+  }
+
+  const first = sorted[0];
+  const latest = sorted[sorted.length - 1];
+  const delta = clampScore(latest.riskScore) - clampScore(first.riskScore);
+  const recentThree = sorted.slice(-3);
+
+  if (recentThree.length === 3) {
+    const [a, b, c] = recentThree.map((snapshot) => clampScore(snapshot.riskScore));
+    if (a < b && b < c) {
+      return {
+        direction: 'up',
+        delta,
+        summary: `Risk rose continuously from ${a} to ${c}.`,
+        pattern: 'continuous_rising',
+      };
+    }
+    if (a > b && b > c) {
+      return {
+        direction: 'down',
+        delta,
+        summary: `Risk fell continuously from ${a} to ${c}.`,
+        pattern: 'continuous_falling',
+      };
+    }
+  }
+
+  if (delta >= 10) {
+    return { direction: 'up', delta, summary: `Risk rose by ${delta} points.`, pattern: 'score_delta' };
+  }
+  if (delta <= -10) {
+    return { direction: 'down', delta, summary: `Risk fell by ${Math.abs(delta)} points.`, pattern: 'score_delta' };
+  }
+  return { direction: 'flat', delta, summary: 'Risk is stable.', pattern: 'stable' };
+}
+
+export function summarizeRiskTrendWithCurrent(
+  snapshots: XiaobaoRiskSnapshot[] = [],
+  current: XiaobaoRiskSnapshot,
+): RiskTrendSummary {
+  return summarizeRiskTrend([...snapshots, current]);
+}
+
+export function buildRiskSignature(snapshot: XiaobaoRiskSnapshot): string {
+  return [
+    snapshot.versionId,
+    snapshot.date,
+    clampScore(snapshot.riskScore),
+    snapshot.riskLevel,
+    snapshot.forecastReleaseDate ?? '',
+    snapshot.openBugCount,
+    snapshot.failedTestCount,
+    snapshot.blockedCount,
+    snapshot.silentRiskCount,
+    clampScore(snapshot.confidence),
+  ].join('|');
+}
+
+function getSnapshotTime(snapshot: XiaobaoRiskSnapshot): number {
+  const date = new Date(snapshot.createdAt || snapshot.date).getTime();
+  return Number.isFinite(date) ? date : 0;
+}
+
+function clampScore(score: number): number {
+  return Math.max(0, Math.min(100, Math.round(score)));
+}