fix(repo): paginate user repositories in repo explorer

src/app/api/metrics/repo-explorer/route.ts

@@ -1,5 +1,5 @@
 import { getSessionWithToken } from "@/lib/get-session-token";
-import { fetchUserRepos } from "@/lib/github";
+import { fetchUserReposPaginated } from "@/lib/github";
 import { NextRequest } from "next/server";
 import { isMetricsCacheBypassed, metricsCacheKey, withMetricsCache } from "@/lib/metrics-cache";
 import { ExplorerRepoCardData } from "@/lib/repo-analytics-types";
@@ -16,14 +16,15 @@ export async function GET(req: NextRequest) {
   const session = sessionData.session;
   const accessToken = sessionData.accessToken;
 
+  const page = parseInt(req.nextUrl.searchParams.get("page") ?? "1", 10);
+  const perPage = parseInt(req.nextUrl.searchParams.get("per_page") ?? "20", 10);
+
   const bypass = isMetricsCacheBypassed(req);
-  const key = metricsCacheKey(session.githubId ?? session.githubLogin!, "repo-explorer-v2" as any, { days: 7 });
+  const key = metricsCacheKey(session.githubId ?? session.githubLogin!, `repo-explorer-v2-p${page}-pp${perPage}` as any, { days: 7 });
 
   try {
     const data = await withMetricsCache({ bypass, key, ttlSeconds: 30 * 60 }, async () => {
-	// Paginate through all pages (up to 1000 repos) so users with more
-	// than 100 repositories see their complete list — fixes #2843.
-	const repos = await fetchUserRepos(accessToken, { perPage: 100, maxPages: 10 });
+      const { repos, hasNextPage } = await fetchUserReposPaginated(accessToken, page, perPage);
       const since = new Date();
       since.setDate(since.getDate() - 30);
       const sinceStr = since.toISOString().slice(0, 10);
@@ -88,7 +89,7 @@ export async function GET(req: NextRequest) {
 
       result.sort((a, b) => b.commitCount - a.commitCount || new Date(b.updatedAt).getTime() - new Date(a.updatedAt).getTime());
 
-      return { repos: result };
+      return { repos: result, hasNextPage };
     });
     return Response.json(data);
   } catch (error) {

src/lib/github.ts

@@ -93,6 +93,48 @@ export async function fetchUserRepos(
   return repos;
 }
 
+export interface PaginatedReposResult {
+  repos: GitHubRepo[];
+  hasNextPage: boolean;
+}
+
+/**
+ * Fetches a single page of repositories for the authenticated user.
+ * @param token - The user's GitHub personal access token.
+ * @param page - The page number to fetch.
+ * @param perPage - The number of items per page.
+ * @returns A promise that resolves to the paginated result.
+ */
+export async function fetchUserReposPaginated(
+  token: string,
+  page: number = 1,
+  perPage: number = 20
+): Promise<PaginatedReposResult> {
+  const res = await githubFetch(
+    `${GITHUB_API}/user/repos?visibility=all&sort=pushed&direction=desc&per_page=${perPage}&page=${page}`,
+    {
+      headers: {
+        Authorization: `Bearer ${token}`,
+        Accept: "application/vnd.github+json",
+      },
+    }
+  );
+
+  if (!res.ok) {
+    if (res.status === 401) throw new GitHubAuthError();
+    throwIfGitHubRateLimited(res);
+    throw new Error(`GitHub API error: ${res.status}`);
+  }
+
+  const repos = (await res.json()) as GitHubRepo[];
+
+  // Check if there's a next page by looking at the Link header
+  const linkHeader = res.headers.get("Link") || "";
+  const hasNextPage = linkHeader.includes('rel="next"');
+
+  return { repos, hasNextPage };
+}
+
 export interface GitHubEvent {
   id: string;
   type: string;

test/github.test.ts

@@ -6,6 +6,7 @@ import type {
   CommitItem,
   GitHubIssueItem,
   IssuesMetrics,
+  PaginatedReposResult,
 } from "../src/lib/github";
 
 describe("github types and interfaces", () => {
@@ -141,4 +142,15 @@ describe("github types and interfaces", () => {
       expect(metrics.mostActiveRepo).toBeNull();
     });
   });
+
+  describe("PaginatedReposResult", () => {
+    it("accepts valid paginated result structure", () => {
+      const result: PaginatedReposResult = {
+        repos: [],
+        hasNextPage: true,
+      };
+      expect(result.hasNextPage).toBe(true);
+      expect(Array.isArray(result.repos)).toBe(true);
+    });
+  });
 });