/**
 * workspace-gate.ts
 *
 * Extension: Workspace Gate
 * Triggers: resources_discover
 *
 * Sole responsibility: control which skill and theme paths Pi discovers
 * based on whether a .pisces workspace marker is present.
 *
 * All user-facing commands (/pisces, /attempt stubs, inactive nudge) live
 * in @aethrekh/pisces-cli, not here.
 */

import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
import { existsSync } from "fs";
import { resolve } from "path";
import { homedir } from "os";
import { join } from "path";
import { syncWorkspaceState } from "../workspace-detector";
import type { AgeGroup } from "../workspace-detector";

const USER_THEME = join(homedir(), ".pi", "agent", "themes", "pisces-editorial-noir.json");

let activeAgeGroup: AgeGroup | null = null;

export function getActiveAgeGroup(): AgeGroup | null {
  return activeAgeGroup;
}

export default function (pi: ExtensionAPI) {
  pi.on("resources_discover", async (event) => {
    const result = syncWorkspaceState((event as { cwd: string }).cwd);
    activeAgeGroup = result.ageGroup;

    // Only advertise the bundled theme path when postinstall hasn't already
    // installed it at the user level — avoids a spurious conflict report.
    const themePaths = existsSync(USER_THEME)
      ? []
      : [resolve(__dirname, "../themes")];

    if (result.isActive) {
      return {
        skillPaths: [resolve(__dirname, "../skills")],
        themePaths,
      };
    }

    return { skillPaths: [], themePaths };
  });
}