import { existsSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";

import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";

export function getExtensionSkillsDir(extensionUrl: string): string {
  return join(dirname(fileURLToPath(extensionUrl)), "skills");
}

export function getExistingExtensionSkillPaths(extensionUrl: string): string[] {
  const skillsDir = getExtensionSkillsDir(extensionUrl);
  return existsSync(skillsDir) ? [skillsDir] : [];
}

export default function featureSymbiontExtension(pi: ExtensionAPI) {
  pi.on("resources_discover", async () => {
    const skillPaths = getExistingExtensionSkillPaths(import.meta.url);
    if (skillPaths.length === 0) return;
    return { skillPaths };
  });
}