export type WidgetConfig = {
  botId: string;
  apiKey: string;
  serverUrl: string;
  position?: 'bottom-right' | 'bottom-left';
  shadow: boolean;
};

export function parseConfig(): WidgetConfig | null {
  const script =
    (document.currentScript as HTMLScriptElement | null) ??
    (document.querySelector(
      'script[data-bot-id][data-api-key]',
    ) as HTMLScriptElement | null);
  if (!script) return null;

  const botId = script.getAttribute('data-bot-id');
  const apiKey = script.getAttribute('data-api-key');
  const serverUrl =
    script.getAttribute('data-server-url') ?? deriveServerFromSrc(script.src);
  const position =
    (script.getAttribute('data-position') as
      | 'bottom-right'
      | 'bottom-left'
      | null) ?? 'bottom-right';
  const shadow = script.getAttribute('data-shadow') === 'true';

  if (!botId || !apiKey) return null;

  return { botId, apiKey, serverUrl, position, shadow };
}

function deriveServerFromSrc(src: string): string {
  try {
    return new URL(src).origin;
  } catch {
    return 'https://messenger-bot.mind4solutions.cloud';
  }
}