/**
 * pi-mcp-adapter detection.
 *
 * The market writes mcp.json regardless, but connecting servers requires
 * pi-mcp-adapter. We detect its presence by checking the installed npm module
 * inside the agent directory, and surface an install action when missing.
 */
import { existsSync, readFileSync } from "node:fs";
import { join } from "node:path";
import { getAgentDir } from "./config.ts";

/** Where pi installs npm packages for the agent. */
export function getNpmModulesDir(): string {
  return join(getAgentDir(), "npm", "node_modules");
}

export function getAdapterPackagePath(): string {
  return join(getNpmModulesDir(), "pi-mcp-adapter", "package.json");
}

/** True when pi-mcp-adapter is installed in the agent's npm modules. */
export function isAdapterInstalled(): boolean {
  return existsSync(getAdapterPackagePath());
}

/** Best-effort installed adapter version, or null. */
export function getAdapterVersion(): string | null {
  try {
    const { version } = JSON.parse(readFileSync(getAdapterPackagePath(), "utf8")) as {
      version?: string;
    };
    return typeof version === "string" ? version : null;
  } catch {
    return null;
  }
}