import { GetParametersByPathCommand, SSMClient } from "@aws-sdk/client-ssm";
import { coverArtAlt, type BlueskyCredentials } from "./bluesky";
import { getCoverArt, type NavidromeCredentials, type Track } from "./navidrome";

const ssm = new SSMClient({});

export function requireEnv(name: string): string {
  const value = process.env[name];
  if (!value) throw new Error(`Missing environment variable ${name}`);
  return value;
}

async function loadSecrets(path: string): Promise<Record<string, string>> {
  const { Parameters = [] } = await ssm.send(
    new GetParametersByPathCommand({ Path: path, Recursive: true, WithDecryption: true }),
  );
  const secrets = Object.fromEntries(
    Parameters.map((parameter) => [parameter.Name!.slice(path.length), parameter.Value!]),
  );
  for (const name of ["navidrome/username", "navidrome/password", "bluesky/identifier", "bluesky/app-password"]) {
    if (!secrets[name]) throw new Error(`Missing SSM parameter ${path}${name}`);
  }
  return secrets;
}

export async function loadCredentials(): Promise<{
  navidrome: NavidromeCredentials;
  bluesky: BlueskyCredentials;
}> {
  const secrets = await loadSecrets(requireEnv("SECRETS_PATH"));
  return {
    navidrome: {
      url: requireEnv("NAVIDROME_URL"),
      username: secrets["navidrome/username"],
      password: secrets["navidrome/password"],
    },
    bluesky: {
      serviceUrl: requireEnv("BLUESKY_SERVICE_URL"),
      identifier: secrets["bluesky/identifier"],
      appPassword: secrets["bluesky/app-password"],
    },
  };
}

/** Every post carries cover art, so art that can't fit Bluesky's limit fails the attempt. */
export async function loadImage(navidrome: NavidromeCredentials, track: Track) {
  const art = await getCoverArt(navidrome, track.coverArt);
  if (!art) throw new Error(`Cover art for track ${track.id} is too large at every size`);
  return { ...art, alt: coverArtAlt(track) };
}