import { createHash } from "node:crypto";
import { homedir } from "node:os";
import { isAbsolute, join, normalize, resolve } from "node:path";

export function defaultPiStateDirectory(): string {
  return join(homedir(), ".pi", "agent");
}

export function workflowWorkspaceId(workspacePath: string): string {
  const canonical = canonicalWorkspacePath(workspacePath);
  return createHash("sha256").update(canonical).digest("hex");
}

export function workflowNamespaceDirectory(
  piStateDirectory: string,
  workspacePath: string,
): string {
  if (!isAbsolute(piStateDirectory)) {
    throw new TypeError("Pi state directory must be absolute");
  }
  return join(
    normalize(piStateDirectory),
    "workspaces",
    workflowWorkspaceId(workspacePath),
    "pi-amq-workflow",
  );
}

function canonicalWorkspacePath(workspacePath: string): string {
  if (!isAbsolute(workspacePath)) throw new TypeError("Workspace path must be absolute");
  return normalize(resolve(workspacePath));
}