vibe coded v1

api/services/vote-service.ts

@@ -0,0 +1,57 @@
+import { APIErrorCode, APIException } from "../model/interfaces.ts";
+import { db } from "../model/db.ts";
+
+export function castVote(dumpId: string, userId: string): number {
+  try {
+    db.exec("BEGIN;");
+    db.prepare(
+      `INSERT INTO votes (dump_id, user_id, created_at) VALUES (?, ?, ?);`,
+    ).run(dumpId, userId, new Date().toISOString());
+    db.prepare(
+      `UPDATE dumps SET vote_count = vote_count + 1 WHERE id = ?;`,
+    ).run(dumpId);
+    const row = db.prepare(
+      `SELECT vote_count FROM dumps WHERE id = ?;`,
+    ).get(dumpId) as { vote_count: number } | undefined;
+    db.exec("COMMIT;");
+    return row?.vote_count ?? 0;
+  } catch (err) {
+    db.exec("ROLLBACK;");
+    if (err instanceof Error && err.message.includes("UNIQUE constraint")) {
+      throw new APIException(APIErrorCode.VALIDATION_ERROR, 409, "Already voted");
+    }
+    throw err;
+  }
+}
+
+export function removeVote(dumpId: string, userId: string): number {
+  try {
+    db.exec("BEGIN;");
+    const result = db.prepare(
+      `DELETE FROM votes WHERE dump_id = ? AND user_id = ?;`,
+    ).run(dumpId, userId);
+    if (result.changes === 0) {
+      db.exec("ROLLBACK;");
+      throw new APIException(APIErrorCode.NOT_FOUND, 404, "Vote not found");
+    }
+    db.prepare(
+      `UPDATE dumps SET vote_count = vote_count - 1 WHERE id = ?;`,
+    ).run(dumpId);
+    const row = db.prepare(
+      `SELECT vote_count FROM dumps WHERE id = ?;`,
+    ).get(dumpId) as { vote_count: number } | undefined;
+    db.exec("COMMIT;");
+    return row?.vote_count ?? 0;
+  } catch (err) {
+    if (err instanceof APIException) throw err;
+    db.exec("ROLLBACK;");
+    throw err;
+  }
+}
+
+export function getUserVotes(userId: string): string[] {
+  const rows = db.prepare(
+    `SELECT dump_id FROM votes WHERE user_id = ?;`,
+  ).all(userId) as { dump_id: string }[];
+  return rows.map((r) => r.dump_id);
+}