feat: add initial recommendation data

lib/recommendation.ts

@@ -0,0 +1,53 @@
+import * as cache from "@lib/cache/cache.ts";
+import * as openai from "@lib/openai.ts";
+import { GenericResource } from "@lib/types.ts";
+import { parseRating } from "@lib/helpers.ts";
+
+type RecommendationResource = {
+  id: string;
+  type: string;
+  rating: number;
+  tags?: string[];
+  keywords?: string[];
+  author?: string;
+  year?: number;
+};
+
+export async function createRecommendationResource(
+  res: GenericResource,
+  description?: string,
+) {
+  const cacheId = `recommendations:${res.type}:${res.id}`;
+  const resource: RecommendationResource = await cache.get(cacheId) || {
+    id: res.id,
+    type: res.type,
+    rating: -1,
+  };
+  if (description && !resource.keywords) {
+    const keywords = await openai.createKeywords(res.type, description);
+    if (keywords?.length) {
+      resource.keywords = keywords;
+    }
+  }
+
+  const { author, date, rating } = res.meta || {};
+
+  if (res?.tags) {
+    resource.tags = res.tags;
+  }
+
+  if (typeof rating !== "undefined") {
+    resource.rating = parseRating(rating);
+  }
+
+  if (author) {
+    resource.author = author;
+  }
+
+  if (date) {
+    const d = typeof date === "string" ? new Date(date) : date;
+    resource.year = d.getFullYear();
+  }
+
+  cache.set(cacheId, JSON.stringify(resource));
+}