2026-07-17 01:58:34 +02:00
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"""Contract PDF generation using WeasyPrint.
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Generates a Verkaufvertrag (sales contract) PDF from an HTML template
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with vehicle data, contact data, GwG-Klausel, and USt-IdNr. field.
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"""
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import asyncio
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import os
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from datetime import date
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from decimal import Decimal
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from typing import Any
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# HTML template for the sales contract
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_CONTRACT_HTML_TEMPLATE = """<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="utf-8">
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<style>
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body {{ font-family: Arial, sans-serif; font-size: 11pt; margin: 2cm; }}
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h1 {{ text-align: center; font-size: 16pt; margin-bottom: 20px; }}
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h2 {{ font-size: 13pt; border-bottom: 1px solid #333; padding-bottom: 3px; }}
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table {{ width: 100%; border-collapse: collapse; margin: 10px 0; }}
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td {{ padding: 4px 8px; vertical-align: top; }}
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td.label {{ font-weight: bold; width: 35%; }}
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.section {{ margin-bottom: 20px; }}
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.gwg-clause {{
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background-color: #fff3cd;
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border: 1px solid #ffc107;
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padding: 10px;
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margin: 15px 0;
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border-radius: 4px;
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}}
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.gwg-clause h3 {{ margin-top: 0; color: #856404; }}
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.signature-block {{ margin-top: 40px; }}
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.signature-line {{ border-top: 1px solid #333; width: 45%; margin-top: 50px; display: inline-block; text-align: center; font-size: 9pt; }}
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.signature-spacer {{ width: 10%; display: inline-block; }}
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.footer {{ margin-top: 30px; font-size: 9pt; color: #666; border-top: 1px solid #ccc; padding-top: 10px; }}
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</style>
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</head>
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<body>
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<h1>Kaufvertrag über ein Nutzfahrzeug</h1>
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<div class="section">
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<h2>1. Vertragsparteien</h2>
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<table>
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<tr><td class="label">Verkäufer:</td><td>{seller_name}<br>{seller_address}<br>{seller_country}</td></tr>
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<tr><td class="label">USt-IdNr. (Verkäufer):</td><td>{seller_vat_id}</td></tr>
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<tr><td class="label">Käufer:</td><td>{buyer_name}<br>{buyer_address}<br>{buyer_country}</td></tr>
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<tr><td class="label">USt-IdNr. (Käufer):</td><td>{buyer_vat_id}</td></tr>
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</table>
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</div>
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<div class="section">
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<h2>2. Vertragsgegenstand</h2>
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<table>
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<tr><td class="label">Fahrzeug:</td><td>{vehicle_make} {vehicle_model}</td></tr>
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<tr><td class="label">Fahrgestellnummer (FIN):</td><td>{vehicle_fin}</td></tr>
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<tr><td class="label">Fahrzeugtyp:</td><td>{vehicle_type}</td></tr>
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<tr><td class="label">Erstzulassung:</td><td>{first_registration}</td></tr>
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<tr><td class="label">Kilometerstand:</td><td>{mileage_km} km</td></tr>
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<tr><td class="label">Leistung:</td><td>{power_kw} kW ({power_hp} PS)</td></tr>
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<tr><td class="label">Kraftstoff:</td><td>{fuel_type}</td></tr>
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</table>
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</div>
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<div class="section">
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<h2>3. Kaufpreis</h2>
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<table>
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<tr><td class="label">Kaufpreis:</td><td>{sale_price} EUR</td></tr>
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<tr><td class="label">Verkaufsdatum:</td><td>{sale_date}</td></tr>
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</table>
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</div>
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{gwg_section}
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<div class="section">
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<h2>4. Zahlungsbedingungen</h2>
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<p>Der Kaufpreis ist bei Übergabe des Fahrzeugs fällig. Die Zahlung erfolgt per
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Überweisung auf das Konto des Verkäufers.</p>
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</div>
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<div class="section">
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<h2>5. Gewährleistung</h2>
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<p>Das Fahrzeug wird unter Ausschluss der Sachmängelhaftung verkauft, soweit
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nicht ausdrücklich etwas anderes vereinbart wurde.</p>
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</div>
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<div class="section">
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<h2>6. Übergabe</h2>
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<p>Das Fahrzeug wird am {sale_date} übergeben. Mit der Übergabe geht die
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Gefahr auf den Käufer über.</p>
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</div>
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<div class="signature-block">
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<div class="signature-line">Verkäufer</div>
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<div class="signature-spacer"></div>
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<div class="signature-line">Käufer</div>
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</div>
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<div class="footer">
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Vertrag erstellt am {created_date} | Vertragsnummer: {contract_number}
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</div>
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</body>
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</html>"""
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_GWG_CLAUSE_HTML = """
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<div class="gwg-clause">
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<h3>Geringwertige Wirtschaftsgüter (GwG) – § 6 Abs. 2 EStG</h3>
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<p>Der Kaufpreis beträgt maximal 800 EUR. Nach § 6 Abs. 2 EStG kann der
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Verkäufer den vollständigen Betrag im Jahr der Anschaffung als
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Sofortabzug im Betriebsvermögen geltend machen. Die
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Abschreibung erfolgt somit sofort und vollständig in der
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Anschaffungsperiode.</p>
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</div>
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"""
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def _format_contact_name(contact: Any) -> str:
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"""Format contact name for the contract."""
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if contact is None:
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return "N/A"
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return getattr(contact, "company_name", "N/A") or "N/A"
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def _format_contact_address(contact: Any) -> str:
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"""Format contact address for the contract."""
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if contact is None:
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return "N/A"
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parts = []
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street = getattr(contact, "address_street", None)
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zip_code = getattr(contact, "address_zip", None)
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city = getattr(contact, "address_city", None)
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if street:
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parts.append(street)
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if zip_code and city:
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parts.append(f"{zip_code} {city}")
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elif city:
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parts.append(city)
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elif zip_code:
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parts.append(zip_code)
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return "<br>".join(parts) if parts else "N/A"
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def _format_contact_country(contact: Any) -> str:
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"""Format contact country for the contract."""
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if contact is None:
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return "N/A"
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return getattr(contact, "address_country", "DE") or "DE"
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def _format_vat_id(contact: Any) -> str:
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"""Format VAT ID for the contract."""
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if contact is None:
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return "Nicht angegeben"
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vat_id = getattr(contact, "vat_id", None)
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return vat_id if vat_id else "Nicht angegeben"
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def _format_price(price: Decimal) -> str:
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"""Format price for the contract."""
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if price is None:
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return "0,00"
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formatted = f"{price:,.2f}"
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return formatted.replace(",", "X").replace(".", ",").replace("X", ".")
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def _format_date(d: date) -> str:
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"""Format date in German convention DD.MM.YYYY."""
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if d is None:
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return "N/A"
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return d.strftime("%d.%m.%Y")
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def build_contract_html(sale: Any) -> str:
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"""Build the HTML contract from a Sale model instance.
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Args:
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sale: Sale model instance with nested vehicle, buyer, seller.
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Returns:
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HTML string for the contract.
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"""
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vehicle = getattr(sale, "vehicle", None)
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buyer = getattr(sale, "buyer", None)
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seller = getattr(sale, "seller", None)
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# Determine GwG clause
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gwg_section = ""
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2026-07-17 21:28:58 +02:00
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if (
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sale.is_gwg
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and sale.sale_price is not None
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and sale.sale_price <= Decimal("800")
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):
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2026-07-17 01:58:34 +02:00
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gwg_section = _GWG_CLAUSE_HTML
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html = _CONTRACT_HTML_TEMPLATE.format(
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seller_name=_format_contact_name(seller) if seller else "N/A",
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seller_address=_format_contact_address(seller) if seller else "N/A",
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seller_country=_format_contact_country(seller) if seller else "DE",
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seller_vat_id=_format_vat_id(seller) if seller else "Nicht angegeben",
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buyer_name=_format_contact_name(buyer),
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buyer_address=_format_contact_address(buyer),
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buyer_country=_format_contact_country(buyer),
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buyer_vat_id=_format_vat_id(buyer),
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vehicle_make=getattr(vehicle, "make", "N/A") if vehicle else "N/A",
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vehicle_model=getattr(vehicle, "model", "N/A") if vehicle else "N/A",
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vehicle_fin=getattr(vehicle, "fin", "N/A") if vehicle else "N/A",
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vehicle_type=getattr(vehicle, "vehicle_type", "N/A") if vehicle else "N/A",
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first_registration=_format_date(getattr(vehicle, "first_registration", None))
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if vehicle
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else "N/A",
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2026-07-17 01:58:34 +02:00
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mileage_km=getattr(vehicle, "mileage_km", "N/A") if vehicle else "N/A",
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power_kw=getattr(vehicle, "power_kw", "N/A") if vehicle else "N/A",
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power_hp=getattr(vehicle, "power_hp", "N/A") if vehicle else "N/A",
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fuel_type=getattr(vehicle, "fuel_type", "N/A") if vehicle else "N/A",
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sale_price=_format_price(sale.sale_price),
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sale_date=_format_date(sale.sale_date),
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gwg_section=gwg_section,
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created_date=_format_date(date.today()),
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contract_number=str(sale.id)[:8].upper(),
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)
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return html
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def generate_contract_pdf_sync(sale: Any, output_dir: str = "/tmp/contracts") -> str:
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"""Generate contract PDF synchronously using WeasyPrint.
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Args:
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sale: Sale model instance with nested vehicle, buyer, seller.
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output_dir: Directory to save the PDF.
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Returns:
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Path to the generated PDF file.
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"""
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from weasyprint import HTML
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os.makedirs(output_dir, exist_ok=True)
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html_content = build_contract_html(sale)
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pdf_path = os.path.join(output_dir, f"contract_{sale.id}.pdf")
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HTML(string=html_content).write_pdf(pdf_path)
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return pdf_path
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async def generate_contract_pdf(sale: Any, output_dir: str = "/tmp/contracts") -> str:
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"""Generate contract PDF asynchronously (runs WeasyPrint in a thread).
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WeasyPrint is synchronous, so we offload it to a thread to avoid
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blocking the event loop.
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Args:
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sale: Sale model instance with nested vehicle, buyer, seller.
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output_dir: Directory to save the PDF.
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Returns:
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Path to the generated PDF file.
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"""
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return await asyncio.to_thread(generate_contract_pdf_sync, sale, output_dir)
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