export type ComposerMenuButton = {
  type: 'web_app';
  text: string;
  web_app: { url: string };
};

export function parseComposerMenuButtonJson(raw?: string | null): ComposerMenuButton | null {
  if (!raw?.trim()) {
    return null;
  }
  try {
    const parsed = JSON.parse(raw) as unknown;
    if (
      typeof parsed === 'object' &&
      parsed !== null &&
      (parsed as ComposerMenuButton).type === 'web_app' &&
      typeof (parsed as ComposerMenuButton).text === 'string' &&
      typeof (parsed as ComposerMenuButton).web_app?.url === 'string'
    ) {
      const button = parsed as ComposerMenuButton;
      const url = button.web_app.url.trim();
      if (!url) {
        return null;
      }
      return { type: 'web_app', text: button.text.trim() || 'App', web_app: { url } };
    }
  } catch {
    return null;
  }
  return null;
}

export function resolveComposerMenuButton(options: {
  composerMenuButtonJson?: string | null;
  composerWebAppUrl?: string | null;
}): ComposerMenuButton | null {
  const fromJson = parseComposerMenuButtonJson(options.composerMenuButtonJson);
  if (fromJson) {
    return fromJson;
  }
  const url = options.composerWebAppUrl?.trim();
  if (url) {
    return { type: 'web_app', text: 'App', web_app: { url } };
  }
  return null;
}