From 5c0ba37eda80d39e6ceca59bb1d5f4942f858995 Mon Sep 17 00:00:00 2001
From: "Somhairle H. Marisol" <muqiu-han@outlook.com>
Date: Thu, 17 Sep 2026 14:32:37 +0800
Subject: chore: establish Strategy Lab source baseline (development, not
 release)

---
 frontend/src/lib/coverage.ts | 52 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 frontend/src/lib/coverage.ts

(limited to 'frontend/src/lib/coverage.ts')

diff --git a/frontend/src/lib/coverage.ts b/frontend/src/lib/coverage.ts
new file mode 100644
index 0000000..c9a8447
--- /dev/null
+++ b/frontend/src/lib/coverage.ts
@@ -0,0 +1,52 @@
+export interface CoverageEntry {
+  instrument: string;
+  market?: string;
+  asset_type?: string;
+  requested_start?: string | null;
+  requested_end?: string | null;
+  actual_start?: string | null;
+  actual_end?: string | null;
+  row_count?: number;
+  warnings?: string[];
+}
+
+export interface CoverageSummary {
+  common: { start: string | null; end: string | null };
+  warnings: string[];
+}
+
+export function summarizeCoverage(entries: CoverageEntry[]): CoverageSummary {
+  const warnings: string[] = [];
+  const withData = entries.filter((e) => (e.row_count ?? 0) > 0 && e.actual_start && e.actual_end);
+  for (const e of entries) {
+    if ((e.row_count ?? 0) === 0) {
+      warnings.push(`${e.instrument} 没有返回任何数据行`);
+    } else if (!e.actual_start || !e.actual_end) {
+      warnings.push(`${e.instrument} 数据区间不完整`);
+    }
+  }
+  let common: { start: string | null; end: string | null } = { start: null, end: null };
+  if (withData.length > 0) {
+    const starts = withData.map((e) => e.actual_start as string).sort();
+    const startsAsc = [...starts];
+    const earliest = startsAsc[0];
+    const lateStart = starts[starts.length - 1];
+    if (lateStart > earliest) {
+      const owner = withData.find((e) => e.actual_start === lateStart);
+      if (owner) {
+        warnings.push(`${owner.instrument} 起始数据较其他标的更晚（${lateStart}）`);
+      }
+    }
+    const ends = withData.map((e) => e.actual_end as string);
+    const commonEnd = ends.sort()[0];
+    const earlyOwners = withData.filter((e) => e.actual_end === commonEnd);
+    const otherEnds = withData.filter((e) => (e.actual_end as string) > commonEnd);
+    if (otherEnds.length > 0) {
+      for (const e of earlyOwners) {
+        warnings.push(`${e.instrument} 较早结束（${commonEnd}），造成共有区间缺失`);
+      }
+    }
+    common = { start: lateStart, end: commonEnd };
+  }
+  return { common, warnings };
+}
-- 
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