from __future__ import annotations

import inspect
import logging
from collections.abc import Iterator
from dataclasses import dataclass
from typing import Any, Generic, Type, TypeVar

from dcs.unittype import FlyingType

from .propertyvalue import PropertyValue

ValueT = TypeVar("ValueT", bool, int)


@dataclass(frozen=True)
class UnitProperty(Generic[ValueT]):
    id: str
    default: ValueT
    values: list[PropertyValue[Any]]

    @classmethod
    def for_aircraft(
        cls, unit_type: Type[FlyingType]
    ) -> Iterator[UnitProperty[ValueT]]:
        try:
            props = unit_type.Properties  # type: ignore
        except AttributeError:
            return

        if unit_type.property_defaults is None:
            raise RuntimeError(f"{unit_type} has Properties but no defaults")

        for name, attr in inspect.getmembers(props, inspect.isclass):
            if name.startswith("__"):
                continue
            attr_values = getattr(attr, "Values", None)
            if attr_values is None and unit_type.property_defaults[name] is None:
                msg = f"Skipping property '{name}' for '{unit_type.id}': default value is None."
                logging.warning(msg)
                continue
            yield cls.property_from(attr, unit_type.property_defaults[name])

    @classmethod
    def property_from(cls, attr: Type[ValueT], default: ValueT) -> UnitProperty[ValueT]:
        prop_id = attr.id  # type: ignore
        values = getattr(attr, "Values", None)
        if values is None:
            prop_values = list(cls.default_values_for(prop_id, default))
        else:
            prop_values = []
            for name, value in inspect.getmembers(values):
                if name.startswith("__"):
                    continue
                prop_values.append(PropertyValue(name, value))
        return UnitProperty(prop_id, default, prop_values)

    @classmethod
    def default_values_for(
        cls, prop_id: str, default: ValueT
    ) -> Iterator[PropertyValue[ValueT]]:
        if isinstance(default, bool):
            yield PropertyValue("True", True)
            yield PropertyValue("False", False)
        elif isinstance(default, int):
            for i in range(10):
                yield PropertyValue(str(i), i)
        else:
            raise TypeError(
                f"Unexpected property type for {prop_id}: {default.__class__}"
            )