export interface CollectorConfig {
  readonly host: string;
  readonly port: number;
  readonly dataDir: string;
  /** boothId → bearer token. */
  readonly boothTokens: ReadonlyMap<string, string>;
  /** The single reviewer login; null = review screen and export refuse (503). */
  readonly reviewer: { readonly user: string; readonly pass: string } | null;
  /** The trainer's job API on the compose network (http://trainer:8091); null = the
   *  Training section is hidden and /api/training/* answers 503. */
  readonly trainerUrl: string | null;
}

/** "booth-7:abc,booth-9:def" (commas, whitespace or newlines between pairs). */
export function parseBoothTokens(raw: string): Map<string, string> {
  const out = new Map<string, string>();
  for (const pair of raw.split(/[,\s]+/)) {
    if (!pair) continue;
    const i = pair.indexOf(":");
    if (i <= 0) throw new Error(`COLLECTOR_BOOTH_TOKENS: bad pair "${pair}" (want boothId:token)`);
    const booth = pair.slice(0, i).trim();
    const token = pair.slice(i + 1).trim();
    if (!booth || token.length < 16) throw new Error(`COLLECTOR_BOOTH_TOKENS: token for "${booth}" too short (>=16 chars)`);
    out.set(booth, token);
  }
  return out;
}

export function configFromEnv(env: NodeJS.ProcessEnv = process.env): CollectorConfig {
  const user = (env.COLLECTOR_REVIEWER_USER ?? "").trim();
  const pass = env.COLLECTOR_REVIEWER_PASS ?? "";
  return {
    host: env.COLLECTOR_HOST ?? "0.0.0.0",
    port: Number(env.COLLECTOR_PORT ?? 8090),
    dataDir: env.COLLECTOR_DATA_DIR ?? "/data",
    boothTokens: parseBoothTokens(env.COLLECTOR_BOOTH_TOKENS ?? ""),
    reviewer: user && pass.length >= 8 ? { user, pass } : null,
    trainerUrl: (env.COLLECTOR_TRAINER_URL ?? "").trim().replace(/\/+$/, "") || null,
  };
}