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"""Implementation of the KNX 235 data point type."""
from __future__ import annotations
from collections.abc import Mapping
from dataclasses import dataclass
from .dpt import DPTComplex, DPTComplexData
from .dpt_5 import DPTTariff
from .dpt_13 import DPTActiveEnergy
from .payload import DPTArray, DPTBinary
@dataclass(slots=True)
class TariffActiveEnergy(DPTComplexData):
"""
Representation of Tariff and ActiveEnergy.
`energy`: int 4byte signed; None if invalid
`tariff`: int 0..254; None if invalid
"""
energy: int | None = None
tariff: int | None = None
@classmethod
def from_dict(cls, data: Mapping[str, int]) -> TariffActiveEnergy:
"""Init from a dictionary."""
try:
energy = data.get("energy")
tariff = data.get("tariff")
except AttributeError as err:
raise ValueError(f"Invalid value for TariffActiveEnergy: {err}") from err
if energy is not None:
try:
energy = int(energy)
except ValueError as err:
raise ValueError(f"Invalid value for energy: {err}") from err
if tariff is not None:
try:
tariff = int(tariff)
except ValueError as err:
raise ValueError(f"Invalid value for tariff: {err}") from err
return cls(energy=energy, tariff=tariff)
def as_dict(self) -> dict[str, int | None]:
"""Create a JSON serializable dictionary."""
return {
"energy": self.energy,
"tariff": self.tariff,
}
class DPTTariffActiveEnergy(DPTComplex[TariffActiveEnergy]):
"""Abstraction for KNX 6 octet Tariff and ActiveEnergy (DPT 235.001)."""
data_type = TariffActiveEnergy
payload_type = DPTArray
payload_length = 6
dpt_main_number = 235
dpt_sub_number = 1
value_type = "tariff_active_energy"
@classmethod
def from_knx(cls, payload: DPTArray | DPTBinary) -> TariffActiveEnergy:
"""Parse/deserialize from KNX/IP raw data."""
raw = cls.validate_payload(payload)
energy_valid = (raw[5] >> 1 & 0b1) == 0
tariff_valid = (raw[5] & 0b1) == 0
return TariffActiveEnergy(
energy=(
DPTActiveEnergy.from_knx(DPTArray(raw[:4])) if energy_valid else None
),
tariff=DPTTariff.from_knx(DPTArray([raw[4]])) if tariff_valid else None,
)
@classmethod
def _to_knx(cls, value: TariffActiveEnergy) -> DPTArray:
"""Serialize to KNX/IP raw data."""
energy = (
DPTActiveEnergy.to_knx(value.energy).value
if value.energy is not None
else [0, 0, 0, 0]
)
tariff = (
DPTTariff.to_knx(value.tariff).value if value.tariff is not None else [0]
)
return DPTArray(
(
*energy,
*tariff,
(value.energy is None) << 1 | (value.tariff is None),
)
)
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