function convertLineBreaks(string){
    return string.replace(/\n/g, '\\\\');
};

module.exports = (options) => {

    var {
            template = 'brief-fam',
            subject = 'Betreff',
            yourRef = '',
            yourRefName = 'Ihr Zeichen',
            yourMail = '',
            myRef = '',
            customer = '',
            invoice = '',
            date = '\\today',
            signature = '',
            specialMail = '',
            address = 'Max Mustermann\\\\Musterstrasse\\\\12345 Musterstadt',
            opening = 'Sehr geehrte Damen und Herren',
            body = 'Inhalt des Briefes',
            closing = 'Mit freundlichen Grüßen',
            ps = '',
            enclosing = '',
        } = options;

    return `% brief document
\\documentclass{scrlttr2}
\\LoadLetterOption{${template}}

\\setkomavar{subject}{${subject}}

\\setkomavar{yourref}[${yourRefName}]{${yourRef}}
\\setkomavar{yourmail}{${yourMail}}
\\setkomavar{myref}{${myRef}}
\\setkomavar{customer}{${customer}}
\\setkomavar{invoice}{${invoice}}

\\setkomavar{date}{${date}}

\\setkomavar{signature}{${signature}}

\\setkomavar{specialmail}{${specialMail}}

\\begin{document}
\\begin{letter}{${convertLineBreaks(address)}}

    \\opening{${opening}}

    ${convertLineBreaks(body)}

    \\closing{${closing}}

    \\ps{${ps}}

    \\encl{${enclosing}}

\\end{letter}
\\end{document}`;
};