/**
 * MathML to OMML Converter
 * 
 * Uses 'mathml2omml' library to convert MathML to Office Math Markup Language (OMML).
 * This is a pure JavaScript implementation and does not require external XSLT files.
 */

import { mml2omml } from 'mathml2omml';

/**
 * Converts MathML string to OMML string using mathml2omml library.
 * @param mathml The MathML content string
 * @returns Promise resolving to OMML string
 */
export async function convertMathmlToOmml(mathml: string): Promise<string> {
  try {
    // The library is synchronous, but we keep the async signature for compatibility 
    // and potential future changes (e.g. if we move this to a worker).
    const omml = mml2omml(mathml);
    return omml;
  } catch (error) {
    console.error('MathML to OMML conversion failed:', error);
    return '';
  }
}

/**
 * Wraps OMML in Word XML clipboard format if needed.
 * This helps Word recognize it when pasting as text.
 */
export function wrapOmmlForClipboard(omml: string): string {
  // Replace 2006 namespaces with 2004/2003 namespaces for Word 2003 XML compatibility
  // This is necessary because the clipboard format uses the older Word XML structure
  const compatibleOmml = omml
    .replace(/http:\/\/schemas\.openxmlformats\.org\/officeDocument\/2006\/math/g, 'http://schemas.microsoft.com/office/2004/12/omml')
    .replace(/http:\/\/schemas\.openxmlformats\.org\/wordprocessingml\/2006\/main/g, 'http://schemas.microsoft.com/office/word/2003/wordml');

  // Simple XML declaration wrapper often helps
  return `<?xml version="1.0"?>
<?mso-application progid="Word.Document"?>
<w:wordDocument xmlns:w="http://schemas.microsoft.com/office/word/2003/wordml" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml">
<w:body>
<w:p>
  <m:oMathPara>
    ${compatibleOmml}
  </m:oMathPara>
</w:p>
</w:body>
</w:wordDocument>`;
}