"""Helpers for working with PDF types."""

from typing import List, Union

try:
    # Python 3.8+: https://peps.python.org/pep-0586
    from typing import Literal  # type: ignore[attr-defined]
except ImportError:
    from typing_extensions import Literal  # type: ignore[misc]

try:
    # Python 3.10+: https://www.python.org/dev/peps/pep-0484/
    from typing import TypeAlias  # type: ignore[attr-defined]
except ImportError:
    from typing_extensions import TypeAlias

from .generic._base import NameObject, NullObject, NumberObject
from .generic._data_structures import ArrayObject, Destination
from .generic._outline import OutlineItem

BorderArrayType: TypeAlias = List[Union[NameObject, NumberObject, ArrayObject]]
OutlineItemType: TypeAlias = Union[OutlineItem, Destination]
FitType: TypeAlias = Literal[
    "/Fit", "/XYZ", "/FitH", "/FitV", "/FitR", "/FitB", "/FitBH", "/FitBV"
]
# Those go with the FitType: They specify values for the fit
ZoomArgType: TypeAlias = Union[NumberObject, NullObject, float]
ZoomArgsType: TypeAlias = List[ZoomArgType]

# Recursive types like the following are not yet supported by mypy:
#    OutlineType = List[Union[Destination, "OutlineType"]]
# See https://github.com/python/mypy/issues/731
# Hence use this for the moment:
OutlineType = List[Union[Destination, List[Union[Destination, List[Destination]]]]]

LayoutType: TypeAlias = Literal[
    "/NoLayout",
    "/SinglePage",
    "/OneColumn",
    "/TwoColumnLeft",
    "/TwoColumnRight",
    "/TwoPageLeft",
    "/TwoPageRight",
]
PagemodeType: TypeAlias = Literal[
    "/UseNone",
    "/UseOutlines",
    "/UseThumbs",
    "/FullScreen",
    "/UseOC",
    "/UseAttachments",
]