#!/usr/bin/env node
/*
 * register-commands.mjs — one-time setMyCommands registration (D-03, D-04, D-17).
 * -------------------------------------------------------------------------------
 * Registers the bot's persistent command menu in two scopes:
 *   1. default scope            — English /help and /privacy descriptions
 *   2. default + language_code "ms" — Malay descriptions for ms users
 *
 * D-03: the menu lists ONLY commands that exist in this phase (/help,
 * /privacy) — no stub entries reserved for future commands. There are
 * exactly two fetch calls below, one per scope.
 *
 * D-05 (single copy source): the descriptions are not inline here — they
 * are derived from src/i18n/strings.ts `helpMenu` lines ("/cmd — text"),
 * the same text /help replies with, so reply and registered menu cannot
 * drift apart.
 *
 * Secrets stay secret (T-02-04): BOT_TOKEN is read from bot/.dev.vars
 * (never committed, D-15) and is never echoed — only the API response's
 * ok/result fields are printed.
 */
import { readFileSync } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { strings } from "../src/i18n/strings.ts";

/* ————— configuration (D-15: local secrets from gitignored .dev.vars) ————— */

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 token = process.env.BOT_TOKEN ?? readDevVars().BOT_TOKEN;
if (!token) {
  console.error(
    "BOT_TOKEN missing — copy bot/.dev.vars.example to bot/.dev.vars (gitignored) and paste your @BotFather token.",
  );
  process.exit(1);
}

/* ————— menu derived from the strings module (D-03/D-05, gap-free) ————— */

/** Extract the `/cmd — description` entries from a locale's helpMenu. */
function menuFor(locale) {
  const lines = strings[locale].helpMenu.split("\n");
  return ["help", "privacy"].map((command) => {
    const marker = `/${command} — `;
    const line = lines.find((l) => l.startsWith(marker));
    if (line === undefined) {
      throw new Error(`helpMenu for "${locale}" is missing its /${command} line (D-03 copy drift)`);
    }
    return { command, description: line.slice(marker.length).trim() };
  });
}

/* ————— exactly two API calls: default scope, then the ms scope (D-03/D-04) ————— */

const API = `https://api.telegram.org/bot${token}/setMyCommands`;
const JSON_HEADERS = { "content-type": "application/json" };

const defaultPayload = { commands: menuFor("en"), bot_command_scope: { type: "default" } };
const msPayload = { commands: menuFor("ms"), bot_command_scope: { type: "default" }, language_code: "ms" };

const defaultRes = await fetch(API, { method: "POST", headers: JSON_HEADERS, body: JSON.stringify(defaultPayload) });
const defaultBody = await defaultRes.json();
console.log(`default scope  -> ok:${defaultBody.ok} result:${JSON.stringify(defaultBody.result ?? null)}`);

const msRes = await fetch(API, { method: "POST", headers: JSON_HEADERS, body: JSON.stringify(msPayload) });
const msBody = await msRes.json();
console.log(`ms scope       -> ok:${msBody.ok} result:${JSON.stringify(msBody.result ?? null)}`);

if (!defaultBody.ok || !msBody.ok) {
  const firstError = !defaultBody.ok ? defaultBody : msBody;
  console.error(`setMyCommands failed: ${firstError.error_code ?? "?"} ${firstError.description ?? "unknown error"}`);
  process.exit(1);
}