cd /home/def/otb_billing/backend || exit 1

STAMP="$(date +%Y%m%d-%H%M%S)"
cp app.py "app.py.email-attachment.${STAMP}.bak"

python3 <<'PY'
from pathlib import Path

p = Path("app.py")
t = p.read_text()

# Find the payment confirmation email block
old = "attachments=None,"

new = """attachments=[{
        "filename": f"invoice_{invoice.get('invoice_number')}.pdf",
        "content": generate_invoice_pdf_bytes(invoice_id),
        "mime": "application/pdf"
    }],"""

if old not in t:
    raise SystemExit("FAILED: attachments=None not found")

t = t.replace(old, new, 1)

# Add helper function if missing
if "def generate_invoice_pdf_bytes" not in t:
    t += """

def generate_invoice_pdf_bytes(invoice_id):
    from io import BytesIO
    buffer = BytesIO()
    c = canvas.Canvas(buffer, pagesize=letter)
    c.drawString(100, 750, f"Invoice #{invoice_id}")
    c.drawString(100, 730, "Generated by OTB Billing")
    c.save()
    buffer.seek(0)
    return buffer.read()
"""

p.write_text(t)
print("OK: email attachment patch applied")
PY

sudo systemctl restart otb_billing.service