1 files changed, 76 insertions, 0 deletions
diff --git a/scripts/cache/manifest.ts b/scripts/cache/manifest.ts
new file mode 100644
index 0000000..7558047
--- /dev/null
+++ b/scripts/cache/manifest.ts
@@ -0,0 +1,76 @@
+import type { S3Client } from 'bun';
+import type { CacheEntry, CacheManifest } from './utils';
+import { writeJsonToS3 } from './utils';
+
+const MANIFEST_KEY = 'manifest.json';
+const MANIFEST_VERSION = 1;
+
+export async function loadManifest(s3: S3Client): Promise<CacheManifest> {
+    const manifestFile = s3.file(MANIFEST_KEY);
+
+    try {
+        if (await manifestFile.exists()) {
+            const data = await manifestFile.text();
+            const manifest: CacheManifest = JSON.parse(data);
+
+            if (manifest.version === MANIFEST_VERSION) {
+                return manifest;
+            }
+        }
+    } catch (e) {
+        console.error('Failed to load manifest:', e);
+    }
+
+    // Return empty manifest if not found or invalid
+    return {
+        version: MANIFEST_VERSION,
+        caches: []
+    };
+}
+
+export async function saveManifest(s3: S3Client, manifest: CacheManifest): Promise<void> {
+    await writeJsonToS3(s3, MANIFEST_KEY, manifest);
+}
+
+export async function addCacheEntry(
+    s3: S3Client,
+    key: string,
+    hash: string,
+    timestamp: number
+): Promise<void> {
+    const manifest = await loadManifest(s3);
+
+    // Remove existing entry with same key if exists
+    manifest.caches = manifest.caches.filter((entry) => entry.key !== key);
+
+    // Add new entry
+    manifest.caches.push({
+        key,
+        hash,
+        timestamp,
+        lastAccessed: timestamp
+    });
+
+    await saveManifest(s3, manifest);
+}
+
+export async function removeCacheEntry(s3: S3Client, key: string): Promise<void> {
+    const manifest = await loadManifest(s3);
+    manifest.caches = manifest.caches.filter((entry) => entry.key !== key);
+    await saveManifest(s3, manifest);
+}
+
+export function findCacheByKey(manifest: CacheManifest, key: string): CacheEntry | null {
+    return manifest.caches.find((entry) => entry.key === key) || null;
+}
+
+export function findCacheByPrefix(manifest: CacheManifest, prefix: string): CacheEntry | null {
+    const matching = manifest.caches.filter((entry) => entry.key.startsWith(prefix));
+
+    if (matching.length === 0) {
+        return null;
+    }
+
+    // Return most recently created cache
+    return matching.sort((a, b) => b.timestamp - a.timestamp)[0];
+}