import { prisma } from "@/lib/db";
import { decryptSecret } from "@/lib/crypto";
import type { LfmPeriod } from "@/lib/lastfm";

// Shared by the three /api/lastfm routes (was copy-pasted three times). Route-only module
// (underscore prefix ⇒ not a route), so importing prisma here never reaches a client bundle.

export const PERIODS: LfmPeriod[] = ["overall", "7day", "1month", "3month", "6month", "12month"];
export const LIMIT = 50;

export async function getLastfmCreds(): Promise<{ username: string; apiKey: string } | null> {
  const rows = await prisma.config.findMany({
    where: { key: { in: ["lastfm.username", "lastfm.api_key"] } },
  });
  const byKey = new Map(rows.map((r) => [r.key, r]));
  const username = byKey.get("lastfm.username")?.value ?? "";
  const keyRow = byKey.get("lastfm.api_key");
  const apiKey = keyRow ? (keyRow.secret ? decryptSecret(keyRow.value) : keyRow.value) : "";
  if (!username || !apiKey) return null;
  return { username, apiKey };
}

/** The `period` query param, validated to a supported LfmPeriod (default "overall"). */
export function parsePeriod(url: URL): LfmPeriod {
  const p = url.searchParams.get("period") ?? "overall";
  return (PERIODS as string[]).includes(p) ? (p as LfmPeriod) : "overall";
}

/** Whether a manual Refresh (cache bypass) was requested. */
export function wantsRefresh(url: URL): boolean {
  return url.searchParams.get("refresh") === "1";
}