fix: show exact deadline status from ledger time

app/api/ledger-time/route.ts

@@ -0,0 +1,86 @@
+import { NextResponse } from 'next/server';
+
+const DEFAULT_HORIZON_URL = 'https://horizon-testnet.stellar.org';
+
+function getHorizonUrl(): string {
+  return (
+    process.env.STELLAR_HORIZON_URL ??
+    process.env.NEXT_PUBLIC_STELLAR_HORIZON_URL ??
+    DEFAULT_HORIZON_URL
+  ).replace(/\/+$/, '');
+}
+
+export async function GET() {
+  try {
+    const response = await fetch(
+      `${getHorizonUrl()}/ledgers?order=desc&limit=1`,
+      {
+        cache: 'no-store',
+        headers: {
+          Accept: 'application/json',
+        },
+      }
+    );
+
+    if (response.status === 401 || response.status === 403) {
+      console.error('[ledger-time] Horizon rejected ledger access', {
+        status: response.status,
+      });
+
+      return NextResponse.json(
+        { error: 'Ledger time access is not permitted.' },
+        { status: 403 }
+      );
+    }
+
+    if (!response.ok) {
+      console.error('[ledger-time] Horizon ledger request failed', {
+        status: response.status,
+      });
+
+      return NextResponse.json(
+        { error: 'Unable to retrieve ledger time.' },
+        { status: 502 }
+      );
+    }
+
+    const payload = await response.json();
+    const ledger = payload?._embedded?.records?.[0];
+
+    const closedAt = ledger?.closed_at;
+    const sequence = Number(ledger?.sequence);
+
+    if (
+      typeof closedAt !== 'string' ||
+      Number.isNaN(new Date(closedAt).getTime()) ||
+      !Number.isSafeInteger(sequence) ||
+      sequence < 0
+    ) {
+      console.error('[ledger-time] Horizon returned an invalid ledger payload');
+
+      return NextResponse.json(
+        { error: 'Invalid ledger time response.' },
+        { status: 502 }
+      );
+    }
+
+    return NextResponse.json(
+      {
+        ledgerTime: closedAt,
+        ledgerSequence: sequence,
+      },
+      {
+        headers: {
+          'Cache-Control': 'no-store, max-age=0',
+        },
+      }
+    );
+  } catch {
+    console.error('[ledger-time] Ledger time request failed');
+
+    return NextResponse.json(
+      { error: 'Ledger time is temporarily unavailable.' },
+      { status: 503 }
+    );
+  }
+}