import HTMLtoDOCX from '@turbodocx/html-to-docx';

export interface DOCXOptions {
  title?: string;
  creator?: string;
  font?: string;
  margins?: { top: number; right: number; bottom: number; left: number };
  lang?: string;
}

export class DOCXConverterService {
  async convert(html: string, options: DOCXOptions = {}): Promise<Buffer> {
    const opts = {
      title: options.title || 'Document',
      creator: options.creator || 'iistwin CRM',
      font: options.font || 'Noto Sans',
      margins: options.margins || { top: 1440, right: 1440, bottom: 1440, left: 1440 },
      lang: options.lang || 'ru-RU',
    };

    const convertFn = typeof HTMLtoDOCX === 'function' ? HTMLtoDOCX : (HTMLtoDOCX as any).default;
    if (typeof convertFn !== 'function') {
      throw new Error('HTMLtoDOCX converter is not available');
    }
    const result = await convertFn(html, null, opts);
    if (result instanceof ArrayBuffer) {
      return Buffer.from(result);
    }
    if (Buffer.isBuffer(result)) {
      return result;
    }
    // Fallback: некоторые версии возвращают Blob/Buffer
    return Buffer.from(result as any);
  }
}