nexus/server/src/routes/telegram.ts

import { Router } from "express";
import { Bot } from "grammy";
import { assertBoard } from "./authz.js";
import { nexusSettingsService } from "../services/nexus-settings.js";
import type { TelegramService } from "../services/telegram.js";
import type { Db } from "@paperclipai/db";

export function telegramRoutes(db: Db, svc: TelegramService): Router {
  const router = Router();

  // POST /telegram/token — validate and save bot token, restart bot
  router.post("/telegram/token", async (req, res) => {
    try {
      assertBoard(req);

      const { token } = req.body as { token?: string };
      if (!token || typeof token !== "string" || token.trim() === "") {
        res.status(400).json({ error: "token is required" });
        return;
      }

      // Validate token by calling getMe
      let botUsername: string;
      try {
        const tempBot = new Bot(token.trim());
        const me = await tempBot.api.getMe();
        botUsername = me.username ?? me.first_name;
      } catch {
        res.status(400).json({ error: "Invalid Telegram bot token" });
        return;
      }

      // Save token to nexus settings
      await nexusSettingsService().set({ telegramToken: token.trim() });

      // Stop old bot and start new one with new token
      await svc.stop();
      svc.start(token.trim()).catch((err) => {
        // Log but don't fail the request — token is saved
        void err;
      });

      res.json({ ok: true, botUsername });
    } catch (err: unknown) {
      if (err && typeof err === "object" && "status" in err) {
        const e = err as { status: number; message: string };
        res.status(e.status).json({ error: e.message });
        return;
      }
      res.status(500).json({ error: "Unexpected error" });
    }
  });

  // GET /telegram/status — return running state
  router.get("/telegram/status", async (req, res) => {
    try {
      assertBoard(req);
      res.json({ running: svc.isRunning() });
    } catch (err: unknown) {
      if (err && typeof err === "object" && "status" in err) {
        const e = err as { status: number; message: string };
        res.status(e.status).json({ error: e.message });
        return;
      }
      res.status(500).json({ error: "Unexpected error" });
    }
  });

  return router;
}