#!/usr/bin/env node
/*
 * set-menu-button.mjs — point the bot's menu button at the Mini App (phase 3).
 * ---------------------------------------------------------------------------
 * Phase 2 deliberately armed the menu button as type `commands` so the command
 * keyboard became visible. The Mini App replaces that as the menu button's
 * DEFAULT action for private chats: type `web_app` opens the deployed origin
 * directly from the bot's attach/menu area.
 *
 * Behavior: reads WEBHOOK_URL from bot/.dev.vars (gitignored) and derives the
 * app origin by stripping the /telegram/webhook path — the same origin every
 * other phase-3 surface deploys to. Default scope (all private chats).
 * Exit 0 only when Telegram answers ok:true; the token is never echoed.
 */
import { readFileSync } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

function readDevVars() {
  const devVarsPath = path.join(fileURLToPath(new URL(import.meta.url)), "..", "..", ".dev.vars");
  let raw = "";
  try {
    raw = readFileSync(devVarsPath, "utf8");
  } catch {
    return {};
  }
  const vars = {};
  for (const line of raw.split("\n")) {
    const trimmed = line.trim();
    if (trimmed.length === 0 || trimmed.startsWith("#")) continue;
    const eq = trimmed.indexOf("=");
    if (eq === -1) continue;
    vars[trimmed.slice(0, eq).trim()] = trimmed.slice(eq + 1).trim();
  }
  return vars;
}

const devVars = readDevVars();
const token = process.env.BOT_TOKEN ?? devVars.BOT_TOKEN;
const webhookUrl = process.env.WEBHOOK_URL ?? devVars.WEBHOOK_URL;

if (!token || !webhookUrl) {
  console.error("Missing BOT_TOKEN or WEBHOOK_URL (bot/.dev.vars or env)");
  process.exit(1);
}

const origin = new URL(webhookUrl).origin;
const appUrl = `${origin}/`;
const res = await fetch(`https://api.telegram.org/bot${token}/setChatMenuButton`, {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    menu_button: { type: "web_app", text: "araharah", web_app: { url: appUrl } },
  }),
});
const body = await res.json();
if (!body.ok) {
  console.error(`setChatMenuButton failed: ${body.error_code} ${body.description}`);
  process.exit(1);
}
console.log("menu button -> web_app", appUrl);