/**
 * @file About route providing API version and release information.
 * @copyright nhcarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */
/* eslint-disable stylistic/max-len -- URL cannot be shortened */
/* eslint-disable require-atomic-updates -- Simple cache; race condition is acceptable */
import { Hono } from "hono";
import type { AboutResponse, GiteaRelease } from "@elysium/types";

// eslint-disable-next-line capitalized-comments -- v8 ignore
/* v8 ignore next -- @preserve */
const apiVersion = process.env.npm_package_version ?? "unknown";

const giteaReleasesUrl = "https://git.nhcarrigan.com/api/v1/repos/nhcarrigan/elysium/releases";
const cacheTtlMs = 5 * 60 * 1000;

interface ReleasesCache {
  data:      Array<GiteaRelease>;
  timestamp: number;
}

let releasesCache: ReleasesCache = { data: [], timestamp: 0 };

const fetchReleases = async(): Promise<Array<GiteaRelease>> => {
  const now = Date.now();
  if (releasesCache.data.length > 0 && now - releasesCache.timestamp < cacheTtlMs) {
    return releasesCache.data;
  }
  try {
    const response = await fetch(giteaReleasesUrl);
    if (!response.ok) {
      return releasesCache.data;
    }
    const rawData: unknown = await response.json();
    /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- External API response */
    const data = rawData as Array<GiteaRelease>;
    releasesCache = { data: data, timestamp: now };
    return releasesCache.data;
  } catch {
    return releasesCache.data;
  }
};

const aboutRouter = new Hono();

aboutRouter.get("/", async(context) => {
  const releases = await fetchReleases();
  const body: AboutResponse = {
    apiVersion,
    releases,
  };
  return context.json(body);
});

export { aboutRouter };