import { createHash } from "node:crypto";
import * as os from "node:os";
import * as path from "node:path";

// Session Path - Persist child sessions as <agent>_<uuid>.jsonl under a cwd hash.
export function getSubagentSessionPath(
  cwd: string,
  agentName: string,
  sessionId: string,
): string {
  const cwdHash = createHash("sha256").update(cwd).digest("hex").slice(0, 16);
  const safeAgent = agentName.replace(/[^\w.-]+/g, "_");
  const safeSessionId = sessionId.replace(/[^\w.-]+/g, "_");
  return path.join(
    os.homedir(),
    ".pi",
    "subagent-sessions",
    cwdHash,
    `${safeAgent}_${safeSessionId}.jsonl`,
  );
}