/**
 * S-08 — slash-command registry route.
 *
 * GET /sessions/:id/commands → [{ name, description, args }]
 *
 * Returns the list of slash commands available in the current pi session.
 * Delegates to pi/commands.ts (T-1.4).
 *
 * Owner: T-1.6
 */

import type { IncomingMessage, ServerResponse } from "node:http";
import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
import { getCommands } from "../../pi/commands.js";
import { getSession } from "../../tmux/manager.js";
import { sendJson } from "../util.js";

export async function handleCommands(
  _req: IncomingMessage,
  res: ServerResponse,
  sessionId: string,
  pi: ExtensionAPI,
): Promise<void> {
  const session = await getSession(sessionId).catch(() => null);
  if (!session) {
    sendJson(res, 404, { error: "session_not_found" });
    return;
  }

  try {
    const commands = await getCommands(pi);
    sendJson(res, 200, commands);
  } catch (err) {
    sendJson(res, 500, { error: "internal_error", message: String(err) });
  }
}