from pathlib import Path
from typing import Any, Generic, Iterator, TypeVar

TData = TypeVar("TData")


class Content(Generic[TData]):
    def __init__(self, path: Path, data: TData, language: str | None = None) -> None:
        self.__path = path
        self.__data = data
        self.__language = language

    @property
    def path(self) -> Path:
        return self.__path

    @property
    def language(self) -> str | None:
        return self.__language

    @property
    def data(self) -> TData:
        return self.__data

    def __str__(self) -> str:
        if isinstance(self.__data, bytes):
            return self.__data.decode("utf-8")
        return str(self.__data)


class ContentField:
    def __init__(self, owner_content_path: Path, value: Any) -> None:
        self.__owner_content_path = owner_content_path
        self.__value = value

    def __getitem__(self, key: Any) -> Any:
        return ContentField(self.__owner_content_path, self.__value.get(key))

    def __iter__(self) -> Iterator[Any]:
        for it in self.__value:
            yield ContentField(self.__owner_content_path, it)

    def __str__(self) -> str:
        return str(self.__value)

    def as_path(self) -> Path:
        if not isinstance(self.__value, (str, Path)):
            raise ValueError("You can't use a field of type %s as a path", type(self.__value))
        return self.__owner_content_path.parent / str(self)