Mateusz Gruszczyński
133 lines
4.7 KiB
Python
133 lines
4.7 KiB
Python
from datetime import date, datetime
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from decimal import Decimal, InvalidOperation
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from .extensions import db
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from .models import AppSetting
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KEYS = {
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"enabled": "global_vat_override_enabled",
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"name": "global_vat_override_name",
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"rate": "global_vat_override_rate",
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"start": "global_vat_override_start",
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"end": "global_vat_override_end",
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}
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def _value(key, default=""):
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setting = db.session.get(AppSetting, KEYS[key])
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return setting.value if setting else default
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def global_vat_override():
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rate_raw = _value("rate")
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try:
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rate = Decimal(rate_raw) if rate_raw != "" else None
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except InvalidOperation:
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rate = None
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return {
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"enabled": _value("enabled", "0") == "1",
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"name": _value("name", "Projekt rządowy"),
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"rate": rate,
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"start": _parse_date(_value("start")),
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"end": _parse_date(_value("end")),
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}
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def _parse_date(value):
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if not value:
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return None
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try:
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return date.fromisoformat(value)
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except ValueError:
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return None
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def effective_vat_rate(nominal_rate, on_date=None):
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override = global_vat_override()
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if not override["enabled"] or override["rate"] is None:
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return Decimal(str(nominal_rate))
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if isinstance(on_date, datetime):
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on_date = on_date.date()
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on_date = on_date or date.today()
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if override["start"] and on_date < override["start"]:
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return Decimal(str(nominal_rate))
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if override["end"] and on_date > override["end"]:
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return Decimal(str(nominal_rate))
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return override["rate"]
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def vat_override_for_date(nominal_rate, on_date=None):
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"""Return a complete, immutable VAT-action snapshot for a date."""
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override = global_vat_override()
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if isinstance(on_date, datetime):
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on_date = on_date.date()
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on_date = on_date or date.today()
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applies = bool(
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override["enabled"]
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and override["rate"] is not None
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and (not override["start"] or on_date >= override["start"])
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and (not override["end"] or on_date <= override["end"])
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)
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return {
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"applied": applies,
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"name": override["name"] if applies else None,
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"rate": override["rate"] if applies else Decimal(str(nominal_rate)),
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"start": override["start"] if applies else None,
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"end": override["end"] if applies else None,
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}
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def freeze_vat_action(entry, nominal_rate, previous_fueled_at=None):
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"""Attach VAT action conditions to an entry without rewriting valid history."""
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fueled_date = entry.fueled_at.date() if isinstance(entry.fueled_at, datetime) else entry.fueled_at
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previous_date = previous_fueled_at.date() if isinstance(previous_fueled_at, datetime) else previous_fueled_at
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if entry.vat_action_frozen and (previous_date is None or previous_date == fueled_date):
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return
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snapshot = vat_override_for_date(nominal_rate, fueled_date)
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entry.vat_action_frozen = True
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entry.vat_action_applied = snapshot["applied"]
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entry.vat_action_name = snapshot["name"]
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entry.vat_action_rate = snapshot["rate"] if snapshot["applied"] else None
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entry.vat_action_start = snapshot["start"]
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entry.vat_action_end = snapshot["end"]
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def entry_vat_rate(entry, nominal_rate):
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if entry.vat_action_frozen:
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if entry.vat_action_applied and entry.vat_action_rate is not None:
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return Decimal(str(entry.vat_action_rate))
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return Decimal(str(nominal_rate))
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return effective_vat_rate(nominal_rate, entry.fueled_at)
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def save_global_vat_override(form):
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enabled = "enabled" in form
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name = (form.get("name") or "Projekt rządowy").strip()
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rate_raw = (form.get("rate") or "").strip()
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start_raw = (form.get("start") or "").strip()
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end_raw = (form.get("end") or "").strip()
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if enabled:
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try:
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rate = Decimal(rate_raw)
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except InvalidOperation as exc:
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raise ValueError("Podaj prawidłową globalną stawkę VAT.") from exc
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if rate < 0 or rate > 100:
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raise ValueError("Globalna stawka VAT musi mieścić się w zakresie 0–100%.")
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if start_raw and not _parse_date(start_raw):
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raise ValueError("Nieprawidłowa data rozpoczęcia.")
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if end_raw and not _parse_date(end_raw):
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raise ValueError("Nieprawidłowa data zakończenia.")
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if start_raw and end_raw and start_raw > end_raw:
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raise ValueError("Data zakończenia nie może być wcześniejsza niż rozpoczęcia.")
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values = {
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KEYS["enabled"]: "1" if enabled else "0",
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KEYS["name"]: name,
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KEYS["rate"]: rate_raw,
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KEYS["start"]: start_raw,
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KEYS["end"]: end_raw,
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}
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for key, value in values.items():
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db.session.merge(AppSetting(key=key, value=value))
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