# === PDF GENERATION ===
# Converts a Django HTML template into a PDF file using xhtml2pdf.
# Used for payslip and receipt PDF attachments sent via email.

from io import BytesIO
from django.template.loader import get_template
from xhtml2pdf import pisa


def render_to_pdf(template_src, context_dict=None):
    """
    Render a Django template to PDF bytes.

    Args:
        template_src: Path to the template (e.g. 'core/pdf/payslip_pdf.html')
        context_dict: Template context variables

    Returns:
        PDF content as bytes, or None if there was an error.
    """
    if context_dict is None:
        context_dict = {}

    # Load and render the HTML template
    template = get_template(template_src)
    html = template.render(context_dict)

    # Convert HTML to PDF
    result = BytesIO()
    pdf = pisa.pisaDocument(BytesIO(html.encode("UTF-8")), result)

    if not pdf.err:
        return result.getvalue()
    return None