"""Plain Python values <-> the wire's Value message.

The daemon owns all SECS-II knowledge (it converts to each variable's
declared wire format); this layer only maps Python types onto the Value
oneof. Order matters in to_value: bool is checked before int because
isinstance(True, int) is True in Python.
"""

from __future__ import annotations

from ._proto import equipment_pb2 as pb


def to_value(v) -> pb.Value:
    if isinstance(v, pb.Value):
        return v
    if isinstance(v, bool):
        return pb.Value(boolean=v)
    if isinstance(v, int):
        return pb.Value(integer=v)
    if isinstance(v, float):
        return pb.Value(real=v)
    if isinstance(v, str):
        return pb.Value(text=v)
    if isinstance(v, (bytes, bytearray)):
        return pb.Value(binary=bytes(v))
    if isinstance(v, (list, tuple)):
        return pb.Value(list=pb.List(items=[to_value(e) for e in v]))
    raise TypeError(f"cannot convert {type(v).__name__} to a SECS value")


def from_value(v: pb.Value):
    kind = v.WhichOneof("kind")
    if kind == "text":
        return v.text
    if kind == "integer":
        return v.integer
    if kind == "real":
        return v.real
    if kind == "boolean":
        return v.boolean
    if kind == "binary":
        return v.binary
    if kind == "list":
        return [from_value(e) for e in v.list.items]
    return None  # unset