import { getChatWsUrlFromEnv } from '@/utils/appConfig.js';

// Small helper to resolve the Chat WebSocket URL from env or sensible defaults
export function getChatWsUrl() {
  // Prefer explicit env var
  const override = (typeof window !== 'undefined' && window.localStorage) ? window.localStorage.getItem('chatWsOverride') : '';
  if (override && typeof override === 'string' && override.trim()) {
    return override.trim();
  }
  return getChatWsUrlFromEnv();
}

// Provide a list of candidate WS URLs to try, in order of likelihood.
export function getChatWsCandidates() {
  const override = (typeof window !== 'undefined' && window.localStorage) ? window.localStorage.getItem('chatWsOverride') : '';
  if (override && typeof override === 'string' && override.trim()) {
    return [override.trim()];
  }
  const resolved = getChatWsUrlFromEnv();
  return [resolved, `${resolved}/`];
}

// Return optional subprotocols for the WebSocket handshake.
export function getChatWsProtocols() {
  try {
    const ls = (typeof window !== 'undefined' && window.localStorage) ? window.localStorage.getItem('chatWsProtocols') : '';
    if (ls && ls.trim()) {
      // Accept JSON array or comma-separated
      if (ls.trim().startsWith('[')) return JSON.parse(ls);
      return ls.split(',').map(s => s.trim()).filter(Boolean);
    }
  } catch (_) {}
  const env = import.meta?.env?.VITE_CHAT_WS_PROTOCOLS;
  if (env && typeof env === 'string' && env.trim()) {
    try {
      if (env.trim().startsWith('[')) return JSON.parse(env);
    } catch (_) {}
    return env.split(',').map(s => s.trim()).filter(Boolean);
  }
  // Default to the 'chat' subprotocol so the server can gate connections accordingly
  return ['chat'];
}