/**
 * Secondary-token channel rename helper.
 *
 * Routes channel/thread renames through a second bot token (RENAMER_BOT)
 * so renames don't consume the primary bot's per-channel 2/10min budget.
 *
 * The secondary bot must be invited to the guild with Manage Channels
 * and Manage Threads.
 *
 * Not called directly from feature code — invoked by services/channelQueue.js
 * so all channel ops continue to flow through the queue.
 */

const { logWarn } = require('../services/debugLog');

const DISCORD_API = 'https://discord.com/api/v10';

async function renameChannel(channelId, newName) {
  const token = (process.env.RENAMER_BOT || '').trim();
  if (!token) {
    throw new Error('RENAMER_BOT is not set; cannot rename via secondary token');
  }

  const res = await fetch(`${DISCORD_API}/channels/${channelId}`, {
    method: 'PATCH',
    headers: {
      'Authorization': `Bot ${token}`,
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ name: newName })
  });

  const text = await res.text();
  let body;
  try {
    body = text ? JSON.parse(text) : null;
  } catch (_) {
    body = text;
  }

  if (res.status === 429) {
    const retryAfter = (body && typeof body === 'object' && body.retry_after) || null;
    logWarn('renamer', `429 rename channel=${channelId} retry_after=${retryAfter}`).catch(() => {});
    const err = new Error(`rename 429: retry_after=${retryAfter}`);
    err.status = 429;
    err.retryAfter = retryAfter;
    err.body = body;
    throw err;
  }

  if (!res.ok) {
    const bodyStr = typeof body === 'string' ? body : JSON.stringify(body);
    const err = new Error(`rename failed: status=${res.status} body=${bodyStr}`);
    err.status = res.status;
    err.body = body;
    throw err;
  }

  return body;
}

module.exports = { renameChannel };