# SPDX-License-Identifier: Apache-2.0
# Copyright © 2021 Intel Corporation

"""Helpers for strict type checking."""

from __future__ import annotations
import itertools, os, re
import typing as T

from .. import compilers
from ..build import (CustomTarget, BuildTarget,
                     CustomTargetIndex, ExtractedObjects, GeneratedList, IncludeDirs,
                     BothLibraries, SharedLibrary, StaticLibrary, Jar, Executable, StructuredSources)
from ..options import UserFeatureOption
from ..dependencies import Dependency, InternalDependency
from ..interpreterbase.decorators import KwargInfo, ContainerTypeInfo
from ..mesonlib import (File, FileMode, MachineChoice, listify, has_path_sep,
                        EnvironmentVariables)
from ..options import OptionKey
from ..programs import ExternalProgram

# Helper definition for type checks that are `Optional[T]`
NoneType: T.Type[None] = type(None)

if T.TYPE_CHECKING:
    from typing_extensions import Literal

    from ..build import ObjectTypes
    from ..interpreterbase import TYPE_var
    from ..mesonlib import EnvInitValueType

    _FullEnvInitValueType = T.Union[EnvironmentVariables, T.List[str], T.List[T.List[str]], EnvInitValueType, str, None]
    PkgConfigDefineType = T.Optional[T.Tuple[T.Tuple[str, str], ...]]
    SourcesVarargsType = T.List[T.Union[str, File, CustomTarget, CustomTargetIndex, GeneratedList, StructuredSources, ExtractedObjects, BuildTarget]]


def in_set_validator(choices: T.Set[str]) -> T.Callable[[str], T.Optional[str]]:
    """Check that the choice given was one of the given set."""

    def inner(check: str) -> T.Optional[str]:
        if check not in choices:
            return f"must be one of {', '.join(sorted(choices))}, not {check}"
        return None

    return inner


def _language_validator(l: T.List[str]) -> T.Optional[str]:
    """Validate language keyword argument.

    Particularly for functions like `add_compiler()`, and `add_*_args()`
    """
    diff = {a.lower() for a in l}.difference(compilers.all_languages)
    if diff:
        return f'unknown languages: {", ".join(diff)}'
    return None


def _install_mode_validator(mode: T.List[T.Union[str, bool, int]]) -> T.Optional[str]:
    """Validate the `install_mode` keyword argument.

    This is a rather odd thing, it's a scalar, or an array of 3 values in the form:
    [(str | False), (str | int | False) = False, (str | int | False) = False]
    where the second and third components are not required and default to False.
    """
    if not mode:
        return None
    if True in mode:
        return 'components can only be permission strings, numbers, or False'
    if len(mode) > 3:
        return 'may have at most 3 elements'

    perms = mode[0]
    if not isinstance(perms, (str, bool)):
        return 'first component must be a permissions string or False'

    if isinstance(perms, str):
        if not len(perms) == 9:
            return ('permissions string must be exactly 9 characters in the form rwxr-xr-x,'
                    f' got {len(perms)}')
        for i in [0, 3, 6]:
            if perms[i] not in {'-', 'r'}:
                return f'permissions character {i+1} must be "-" or "r", not {perms[i]}'
        for i in [1, 4, 7]:
            if perms[i] not in {'-', 'w'}:
                return f'permissions character {i+1} must be "-" or "w", not {perms[i]}'
        for i in [2, 5]:
            if perms[i] not in {'-', 'x', 's', 'S'}:
                return f'permissions character {i+1} must be "-", "s", "S", or "x", not {perms[i]}'
        if perms[8] not in {'-', 'x', 't', 'T'}:
            return f'permission character 9 must be "-", "t", "T", or "x", not {perms[8]}'

        if len(mode) >= 2 and not isinstance(mode[1], (int, str, bool)):
            return 'second component can only be a string, number, or False'
        if len(mode) >= 3 and not isinstance(mode[2], (int, str, bool)):
            return 'third component can only be a string, number, or False'

    return None


def _install_mode_convertor(mode: T.Optional[T.List[T.Union[str, bool, int]]]) -> FileMode:
    """Convert the DSL form of the `install_mode` keyword argument to `FileMode`"""

    if not mode:
        return FileMode()

    # This has already been validated by the validator. False denotes "use
    # default". mypy is totally incapable of understanding it, because
    # generators clobber types via homogeneous return. But also we *must*
    # convert the first element different from the rest
    m1 = mode[0] if isinstance(mode[0], str) else None
    rest = (m if isinstance(m, (str, int)) else None for m in mode[1:])

    return FileMode(m1, *rest)


def _lower_strlist(input: T.List[str]) -> T.List[str]:
    """Lower a list of strings.

    mypy (but not pyright) gets confused about using a lambda as the convertor function
    """
    return [i.lower() for i in input]


def _validate_shlib_version(val: T.Optional[str]) -> T.Optional[str]:
    if val is not None and not re.fullmatch(r'[0-9]+(\.[0-9]+){0,2}', val):
        return (f'Invalid Shared library version "{val}". '
                'Must be of the form X.Y.Z where all three are numbers. Y and Z are optional.')
    return None


def variables_validator(contents: T.Union[str, T.List[str], T.Dict[str, str]]) -> T.Optional[str]:
    if isinstance(contents, str):
        contents = [contents]
    if isinstance(contents, dict):
        variables = contents
    else:
        variables = {}
        for v in contents:
            try:
                key, val = v.split('=', 1)
            except ValueError:
                return f'variable {v!r} must have a value separated by equals sign.'
            variables[key.strip()] = val.strip()
    for k, v in variables.items():
        if not k:
            return 'empty variable name'
        if any(c.isspace() for c in k):
            return f'invalid whitespace in variable name {k!r}'
    return None


def variables_convertor(contents: T.Union[str, T.List[str], T.Dict[str, str]]) -> T.Dict[str, str]:
    if isinstance(contents, str):
        contents = [contents]
    if isinstance(contents, dict):
        return contents
    variables = {}
    for v in contents:
        key, val = v.split('=', 1)
        variables[key.strip()] = val.strip()
    return variables


NATIVE_KW = KwargInfo(
    'native', bool,
    default=False,
    convertor=lambda n: MachineChoice.BUILD if n else MachineChoice.HOST)

LANGUAGE_KW = KwargInfo(
    'language', ContainerTypeInfo(list, str, allow_empty=False),
    listify=True,
    required=True,
    validator=_language_validator,
    convertor=_lower_strlist)

INSTALL_MODE_KW: KwargInfo[T.List[T.Union[str, bool, int]]] = KwargInfo(
    'install_mode',
    ContainerTypeInfo(list, (str, bool, int)),
    listify=True,
    default=[],
    validator=_install_mode_validator,
    convertor=_install_mode_convertor,
)

REQUIRED_KW: KwargInfo[T.Union[bool, UserFeatureOption]] = KwargInfo(
    'required',
    (bool, UserFeatureOption),
    default=True,
    # TODO: extract_required_kwarg could be converted to a convertor
)

DISABLER_KW: KwargInfo[bool] = KwargInfo('disabler', bool, default=False)

def _env_validator(value: T.Union[EnvironmentVariables, T.List['TYPE_var'], T.Dict[str, 'TYPE_var'], str, None],
                   only_dict_str: bool = True) -> T.Optional[str]:
    def _splitter(v: str) -> T.Optional[str]:
        split = v.split('=', 1)
        if len(split) == 1:
            return f'"{v}" is not two string values separated by an "="'
        return None

    if isinstance(value, str):
        v = _splitter(value)
        if v is not None:
            return v
    elif isinstance(value, list):
        for i in listify(value):
            if not isinstance(i, str):
                return f"All array elements must be a string, not {i!r}"
            v = _splitter(i)
            if v is not None:
                return v
    elif isinstance(value, dict):
        # We don't need to spilt here, just do the type checking
        for k, dv in value.items():
            if only_dict_str:
                if any(i for i in listify(dv) if not isinstance(i, str)):
                    return f"Dictionary element {k} must be a string or list of strings not {dv!r}"
            elif isinstance(dv, list):
                if any(not isinstance(i, str) for i in dv):
                    return f"Dictionary element {k} must be a string, bool, integer or list of strings, not {dv!r}"
            elif not isinstance(dv, (str, bool, int)):
                return f"Dictionary element {k} must be a string, bool, integer or list of strings, not {dv!r}"
    # We know that otherwise we have an EnvironmentVariables object or None, and
    # we're okay at this point
    return None

def _options_validator(value: T.Union[EnvironmentVariables, T.List['TYPE_var'], T.Dict[str, 'TYPE_var'], str, None]) -> T.Optional[str]:
    # Reusing the env validator is a little overkill, but nicer than duplicating the code
    return _env_validator(value, only_dict_str=False)

def split_equal_string(input: str) -> T.Tuple[str, str]:
    """Split a string in the form `x=y`

    This assumes that the string has already been validated to split properly.
    """
    a, b = input.split('=', 1)
    return (a, b)

# Split _env_convertor() and env_convertor_with_method() to make mypy happy.
# It does not want extra arguments in KwargInfo convertor callable.
def env_convertor_with_method(value: _FullEnvInitValueType,
                              init_method: Literal['set', 'prepend', 'append'] = 'set',
                              separator: str = os.pathsep) -> EnvironmentVariables:
    if isinstance(value, str):
        return EnvironmentVariables(dict([split_equal_string(value)]), init_method, separator)
    elif isinstance(value, list):
        return EnvironmentVariables(dict(split_equal_string(v) for v in listify(value)), init_method, separator)
    elif isinstance(value, dict):
        return EnvironmentVariables(value, init_method, separator)
    elif value is None:
        return EnvironmentVariables()
    return value

def _env_convertor(value: _FullEnvInitValueType) -> EnvironmentVariables:
    return env_convertor_with_method(value)

ENV_KW: KwargInfo[T.Union[EnvironmentVariables, T.List, T.Dict, str, None]] = KwargInfo(
    'env',
    (EnvironmentVariables, list, dict, str, NoneType),
    validator=_env_validator,
    convertor=_env_convertor,
)

DEPFILE_KW: KwargInfo[T.Optional[str]] = KwargInfo(
    'depfile',
    (str, type(None)),
    validator=lambda x: 'Depfile must be a plain filename with a subdirectory' if has_path_sep(x) else None
)

DEPENDS_KW: KwargInfo[T.List[T.Union[BuildTarget, CustomTarget, CustomTargetIndex]]] = KwargInfo(
    'depends',
    ContainerTypeInfo(list, (BuildTarget, CustomTarget, CustomTargetIndex)),
    listify=True,
    default=[],
    since_values={CustomTargetIndex: '1.5.0'},
)

DEPEND_FILES_KW: KwargInfo[T.List[T.Union[str, File]]] = KwargInfo(
    'depend_files',
    ContainerTypeInfo(list, (File, str)),
    listify=True,
    default=[],
)

COMMAND_KW: KwargInfo[T.List[T.Union[str, BuildTarget, CustomTarget, CustomTargetIndex, ExternalProgram, File]]] = KwargInfo(
    'command',
    ContainerTypeInfo(list, (str, BuildTarget, CustomTarget, CustomTargetIndex, ExternalProgram, File), allow_empty=False),
    required=True,
    listify=True,
    default=[],
)

def _override_options_convertor(raw: T.Union[str, T.List[str], T.Dict[str, T.Union[str, int, bool, T.List[str]]]]) -> T.Dict[OptionKey, T.Union[str, int, bool, T.List[str]]]:
    if isinstance(raw, str):
        raw = [raw]
    if isinstance(raw, list):
        output: T.Dict[OptionKey, T.Union[str, int, bool, T.List[str]]] = {}
        for each in raw:
            k, v = split_equal_string(each)
            output[OptionKey.from_string(k)] = v
        return output
    return {OptionKey.from_string(k): v for k, v in raw.items()}


OVERRIDE_OPTIONS_KW: KwargInfo[T.Union[str, T.Dict[str, T.Union[str, int, bool, T.List[str]]], T.List[str]]] = KwargInfo(
    'override_options',
    (str, ContainerTypeInfo(list, str), ContainerTypeInfo(dict, (str, int, bool, list))),
    default={},
    validator=_options_validator,
    convertor=_override_options_convertor,
    since_values={dict: '1.2.0'},
)


def _output_validator(outputs: T.List[str]) -> T.Optional[str]:
    output_set = set(outputs)
    if len(output_set) != len(outputs):
        seen = set()
        for el in outputs:
            if el in seen:
                return f"contains {el!r} multiple times, but no duplicates are allowed."
            seen.add(el)
    for i in outputs:
        if i == '':
            return 'Output must not be empty.'
        elif i.strip() == '':
            return 'Output must not consist only of whitespace.'
        elif has_path_sep(i):
            return f'Output {i!r} must not contain a path segment.'
        elif '@INPUT' in i:
            return f'output {i!r} contains "@INPUT", which is invalid. Did you mean "@PLAINNAME@" or "@BASENAME@?'

    return None

MULTI_OUTPUT_KW: KwargInfo[T.List[str]] = KwargInfo(
    'output',
    ContainerTypeInfo(list, str, allow_empty=False),
    listify=True,
    required=True,
    default=[],
    validator=_output_validator,
)

OUTPUT_KW: KwargInfo[str] = KwargInfo(
    'output',
    str,
    required=True,
    validator=lambda x: _output_validator([x])
)

CT_INPUT_KW: KwargInfo[T.List[T.Union[str, File, ExternalProgram, BuildTarget, CustomTarget, CustomTargetIndex, ExtractedObjects, GeneratedList]]] = KwargInfo(
    'input',
    ContainerTypeInfo(list, (str, File, ExternalProgram, BuildTarget, CustomTarget, CustomTargetIndex, ExtractedObjects, GeneratedList)),
    listify=True,
    default=[],
)

CT_INSTALL_TAG_KW: KwargInfo[T.List[T.Union[str, bool]]] = KwargInfo(
    'install_tag',
    ContainerTypeInfo(list, (str, bool)),
    listify=True,
    default=[],
    since='0.60.0',
    convertor=lambda x: [y if isinstance(y, str) else None for y in x],
)

INSTALL_TAG_KW: KwargInfo[T.Optional[str]] = KwargInfo('install_tag', (str, NoneType))

INSTALL_FOLLOW_SYMLINKS: KwargInfo[T.Optional[bool]] = KwargInfo(
    'follow_symlinks',
    (bool, NoneType),
    since='1.3.0',
)

INSTALL_KW = KwargInfo('install', bool, default=False)

CT_INSTALL_DIR_KW: KwargInfo[T.List[T.Union[str, Literal[False]]]] = KwargInfo(
    'install_dir',
    ContainerTypeInfo(list, (str, bool)),
    listify=True,
    default=[],
    validator=lambda x: 'must be `false` if boolean' if True in x else None,
)

CT_BUILD_BY_DEFAULT: KwargInfo[T.Optional[bool]] = KwargInfo('build_by_default', (bool, type(None)), since='0.40.0')

CT_BUILD_ALWAYS: KwargInfo[T.Optional[bool]] = KwargInfo(
    'build_always', (bool, NoneType),
    deprecated='0.47.0',
    deprecated_message='combine build_by_default and build_always_stale instead.',
)

CT_BUILD_ALWAYS_STALE: KwargInfo[T.Optional[bool]] = KwargInfo(
    'build_always_stale', (bool, NoneType),
    since='0.47.0',
)

INSTALL_DIR_KW: KwargInfo[T.Optional[str]] = KwargInfo('install_dir', (str, NoneType))

INCLUDE_DIRECTORIES: KwargInfo[T.List[T.Union[str, IncludeDirs]]] = KwargInfo(
    'include_directories',
    ContainerTypeInfo(list, (str, IncludeDirs)),
    listify=True,
    default=[],
)

DEFAULT_OPTIONS = OVERRIDE_OPTIONS_KW.evolve(name='default_options')

ENV_METHOD_KW = KwargInfo('method', str, default='set', since='0.62.0',
                          validator=in_set_validator({'set', 'prepend', 'append'}))

ENV_SEPARATOR_KW = KwargInfo('separator', str, default=os.pathsep)

DEPENDENCIES_KW: KwargInfo[T.List[Dependency]] = KwargInfo(
    'dependencies',
    # InternalDependency is a subclass of Dependency, but we want to
    # print it in error messages
    ContainerTypeInfo(list, (Dependency, InternalDependency)),
    listify=True,
    default=[],
)

D_MODULE_VERSIONS_KW: KwargInfo[T.List[T.Union[str, int]]] = KwargInfo(
    'd_module_versions',
    ContainerTypeInfo(list, (str, int)),
    listify=True,
    default=[],
)

_link_with_error = '''can only be self-built targets, external dependencies (including libraries) must go in "dependencies".'''

# Allow Dependency for the better error message? But then in other cases it will list this as one of the allowed types!
LINK_WITH_KW: KwargInfo[T.List[T.Union[BothLibraries, SharedLibrary, StaticLibrary, CustomTarget, CustomTargetIndex, Jar, Executable]]] = KwargInfo(
    'link_with',
    ContainerTypeInfo(list, (BothLibraries, SharedLibrary, StaticLibrary, CustomTarget, CustomTargetIndex, Jar, Executable, Dependency)),
    listify=True,
    default=[],
    validator=lambda x: _link_with_error if any(isinstance(i, Dependency) for i in x) else None,
)

def link_whole_validator(values: T.List[T.Union[StaticLibrary, CustomTarget, CustomTargetIndex, Dependency]]) -> T.Optional[str]:
    for l in values:
        if isinstance(l, (CustomTarget, CustomTargetIndex)) and l.links_dynamically():
            return f'{type(l).__name__} returning a shared library is not allowed'
        if isinstance(l, Dependency):
            return _link_with_error
    return None

LINK_WHOLE_KW: KwargInfo[T.List[T.Union[BothLibraries, StaticLibrary, CustomTarget, CustomTargetIndex]]] = KwargInfo(
    'link_whole',
    ContainerTypeInfo(list, (BothLibraries, StaticLibrary, CustomTarget, CustomTargetIndex, Dependency)),
    listify=True,
    default=[],
    validator=link_whole_validator,
)

DEPENDENCY_SOURCES_KW: KwargInfo[T.List[T.Union[str, File, CustomTarget, CustomTargetIndex, GeneratedList]]] = KwargInfo(
    'sources',
    ContainerTypeInfo(list, (str, File, CustomTarget, CustomTargetIndex, GeneratedList)),
    listify=True,
    default=[],
)

SOURCES_VARARGS = (str, File, CustomTarget, CustomTargetIndex, GeneratedList, StructuredSources, ExtractedObjects, BuildTarget)

BT_SOURCES_KW: KwargInfo[SourcesVarargsType] = KwargInfo(
    'sources',
    (NoneType, ContainerTypeInfo(list, SOURCES_VARARGS)),
    listify=True,
    default=[],
)

VARIABLES_KW: KwargInfo[T.Dict[str, str]] = KwargInfo(
    'variables',
    # str is listified by validator/convertor, cannot use listify=True here because
    # that would listify dict too.
    (str, ContainerTypeInfo(list, str), ContainerTypeInfo(dict, str)), # type: ignore
    validator=variables_validator,
    convertor=variables_convertor,
    default={},
)

PRESERVE_PATH_KW: KwargInfo[bool] = KwargInfo('preserve_path', bool, default=False, since='0.63.0')

TEST_KWS: T.List[KwargInfo] = [
    KwargInfo('args', ContainerTypeInfo(list, (str, File, BuildTarget, CustomTarget, CustomTargetIndex, ExternalProgram)),
              listify=True, default=[]),
    KwargInfo('should_fail', bool, default=False),
    KwargInfo('timeout', int, default=30),
    KwargInfo('workdir', (str, NoneType), default=None,
              validator=lambda x: 'must be an absolute path' if not os.path.isabs(x) else None),
    KwargInfo('protocol', str,
              default='exitcode',
              validator=in_set_validator({'exitcode', 'tap', 'gtest', 'rust'}),
              since_values={'gtest': '0.55.0', 'rust': '0.57.0'}),
    KwargInfo('priority', int, default=0, since='0.52.0'),
    # TODO: env needs reworks of the way the environment variable holder itself works probably
    ENV_KW,
    DEPENDS_KW.evolve(since='0.46.0'),
    KwargInfo('suite', ContainerTypeInfo(list, str), listify=True, default=['']),  # yes, a list of empty string
    KwargInfo('verbose', bool, default=False, since='0.62.0'),
]

# Cannot have a default value because we need to check that rust_crate_type and
# rust_abi are mutually exclusive.
RUST_CRATE_TYPE_KW: KwargInfo[T.Union[str, None]] = KwargInfo(
    'rust_crate_type', (str, NoneType),
    since='0.42.0',
    since_values={'proc-macro': '0.62.0'},
    deprecated='1.3.0',
    deprecated_message='Use rust_abi or rust.proc_macro() instead.',
    validator=in_set_validator({'bin', 'lib', 'rlib', 'dylib', 'cdylib', 'staticlib', 'proc-macro'}))

RUST_ABI_KW: KwargInfo[T.Union[str, None]] = KwargInfo(
    'rust_abi', (str, NoneType),
    since='1.3.0',
    validator=in_set_validator({'rust', 'c'}))

_VS_MODULE_DEFS_KW: KwargInfo[T.Optional[T.Union[str, File, CustomTarget, CustomTargetIndex]]] = KwargInfo(
    'vs_module_defs',
    (str, File, CustomTarget, CustomTargetIndex, NoneType),
    since_values={CustomTargetIndex: '1.3.0'}
)

_BASE_LANG_KW: KwargInfo[T.List[str]] = KwargInfo(
    'UNKNOWN',
    ContainerTypeInfo(list, (str)),
    listify=True,
    default=[],
)

_LANGUAGE_KWS: T.List[KwargInfo[T.List[str]]] = [
    _BASE_LANG_KW.evolve(name=f'{lang}_args')
    for lang in compilers.all_languages - {'rust', 'vala', 'java'}
]
# Cannot use _BASE_LANG_KW here because Vala is special for types
_LANGUAGE_KWS.append(KwargInfo(
    'vala_args', ContainerTypeInfo(list, (str, File)), listify=True, default=[]))
_LANGUAGE_KWS.append(_BASE_LANG_KW.evolve(name='rust_args', since='0.41.0'))

# We need this deprecated values more than the non-deprecated values. So we'll evolve them out elsewhere.
_JAVA_LANG_KW: KwargInfo[T.List[str]] = _BASE_LANG_KW.evolve(
    name='java_args',
    deprecated='1.3.0',
    deprecated_message='This does not, and never has, done anything. It should be removed'
)

def _objects_validator(vals: T.List[ObjectTypes]) -> T.Optional[str]:
    non_objects: T.List[str] = []

    for val in vals:
        if isinstance(val, (str, File, ExtractedObjects)):
            continue
        else:
            non_objects.extend(o for o in val.get_outputs() if not compilers.is_object(o))

    if non_objects:
        return f'{", ".join(non_objects)!r} are not objects'

    return None


# Applies to all build_target like classes
_ALL_TARGET_KWS: T.List[KwargInfo] = [
    OVERRIDE_OPTIONS_KW,
    KwargInfo('build_by_default', bool, default=True, since='0.38.0'),
    KwargInfo('extra_files', ContainerTypeInfo(list, (str, File)), default=[], listify=True),
    # Accursed. We allow this for backwards compat and warn in the interpreter.
    KwargInfo('install', object, default=False),
    INSTALL_MODE_KW,
    KwargInfo('implicit_include_directories', bool, default=True, since='0.42.0'),
    NATIVE_KW,
    KwargInfo('resources', ContainerTypeInfo(list, str), default=[], listify=True),
    KwargInfo(
        'objects',
        ContainerTypeInfo(list, (str, File, CustomTarget, CustomTargetIndex, GeneratedList, ExtractedObjects)),
        listify=True,
        default=[],
        validator=_objects_validator,
        since_values={
            ContainerTypeInfo(list, (GeneratedList, CustomTarget, CustomTargetIndex)):
                ('1.1.0', 'generated sources as positional "objects" arguments')
        },
    ),
]


def _name_validator(arg: T.Optional[T.Union[str, T.List]]) -> T.Optional[str]:
    if isinstance(arg, list) and arg:
        return 'must be empty when passed as an array to signify the default value.'
    return None


def _name_suffix_validator(arg: T.Optional[T.Union[str, T.List]]) -> T.Optional[str]:
    if arg == '':
        return 'must not be a empty string. An empty array may be passed if you want Meson to use the default behavior.'
    return _name_validator(arg)


_NAME_PREFIX_KW: KwargInfo[T.Optional[T.Union[str, T.List]]] = KwargInfo(
    'name_prefix',
    (str, NoneType, list),
    validator=_name_validator,
    convertor=lambda x: None if isinstance(x, list) else x,
)


# Applies to all build_target classes except jar
_BUILD_TARGET_KWS: T.List[KwargInfo] = [
    *_ALL_TARGET_KWS,
    *_LANGUAGE_KWS,
    BT_SOURCES_KW,
    INCLUDE_DIRECTORIES.evolve(name='d_import_dirs'),
    _NAME_PREFIX_KW,
    _NAME_PREFIX_KW.evolve(name='name_suffix', validator=_name_suffix_validator),
    RUST_CRATE_TYPE_KW,
    KwargInfo('d_debug', ContainerTypeInfo(list, (str, int)), default=[], listify=True),
    D_MODULE_VERSIONS_KW,
    KwargInfo('d_unittest', bool, default=False),
    KwargInfo(
        'rust_dependency_map',
        ContainerTypeInfo(dict, str),
        default={},
        since='1.2.0',
    ),
    KwargInfo('build_rpath', str, default='', since='0.42.0'),
    KwargInfo(
        'gnu_symbol_visibility',
        str,
        default='',
        validator=in_set_validator({'', 'default', 'internal', 'hidden', 'protected', 'inlineshidden'}),
        since='0.48.0',
    ),
    KwargInfo('install_rpath', str, default=''),
    KwargInfo(
        'link_depends',
        ContainerTypeInfo(list, (str, File, CustomTarget, CustomTargetIndex, BuildTarget)),
        default=[],
        listify=True,
    ),
    KwargInfo(
        'link_language',
        (str, NoneType),
        validator=in_set_validator(set(compilers.all_languages)),
        since='0.51.0',
    ),
]

def _validate_win_subsystem(value: T.Optional[str]) -> T.Optional[str]:
    if value is not None:
        if re.fullmatch(r'(boot_application|console|efi_application|efi_boot_service_driver|efi_rom|efi_runtime_driver|native|posix|windows)(,\d+(\.\d+)?)?', value) is None:
            return f'Invalid value for win_subsystem: {value}.'
    return None


def _validate_darwin_versions(darwin_versions: T.List[T.Union[str, int]]) -> T.Optional[str]:
    if len(darwin_versions) > 2:
        return f"Must contain between 0 and 2 elements, not {len(darwin_versions)}"
    if len(darwin_versions) == 1:
        darwin_versions = 2 * darwin_versions
    for v in darwin_versions:
        if isinstance(v, int):
            v = str(v)
        if not re.fullmatch(r'[0-9]+(\.[0-9]+){0,2}', v):
            return 'must be X.Y.Z where X, Y, Z are numbers, and Y and Z are optional'
        try:
            parts = v.split('.')
        except ValueError:
            return f'badly formed value: "{v}, not in X.Y.Z form'
        if len(parts) in {1, 2, 3} and int(parts[0]) > 65535:
            return 'must be X.Y.Z where X is [0, 65535] and Y, Z are optional'
        if len(parts) in {2, 3} and int(parts[1]) > 255:
            return 'must be X.Y.Z where Y is [0, 255] and Y, Z are optional'
        if len(parts) == 3 and int(parts[2]) > 255:
            return 'must be X.Y.Z where Z is [0, 255] and Y, Z are optional'
    return None


def _convert_darwin_versions(val: T.List[T.Union[str, int]]) -> T.Optional[T.Tuple[str, str]]:
    if not val:
        return None
    elif len(val) == 1:
        v = str(val[0])
        return (v, v)
    return (str(val[0]), str(val[1]))


_DARWIN_VERSIONS_KW: KwargInfo[T.List[T.Union[str, int]]] = KwargInfo(
    'darwin_versions',
    ContainerTypeInfo(list, (str, int)),
    default=[],
    listify=True,
    validator=_validate_darwin_versions,
    convertor=_convert_darwin_versions,
    since='0.48.0',
)

# Arguments exclusive to Executable. These are separated to make integrating
# them into build_target easier
_EXCLUSIVE_EXECUTABLE_KWS: T.List[KwargInfo] = [
    KwargInfo('export_dynamic', (bool, NoneType), since='0.45.0'),
    KwargInfo('gui_app', (bool, NoneType), deprecated='0.56.0', deprecated_message="Use 'win_subsystem' instead"),
    KwargInfo('implib', (bool, str, NoneType), since='0.42.0'),
    KwargInfo('pie', (bool, NoneType)),
    KwargInfo(
        'win_subsystem',
        (str, NoneType),
        convertor=lambda x: x.lower() if isinstance(x, str) else None,
        validator=_validate_win_subsystem,
    ),
]

# The total list of arguments used by Executable
EXECUTABLE_KWS = [
    *_BUILD_TARGET_KWS,
    *_EXCLUSIVE_EXECUTABLE_KWS,
    _VS_MODULE_DEFS_KW.evolve(since='1.3.0', since_values=None),
    _JAVA_LANG_KW,
]

# Arguments exclusive to library types
_EXCLUSIVE_LIB_KWS: T.List[KwargInfo] = [
    RUST_ABI_KW,
]

# Arguments exclusive to StaticLibrary. These are separated to make integrating
# them into build_target easier
_EXCLUSIVE_STATIC_LIB_KWS: T.List[KwargInfo] = [
    KwargInfo('prelink', bool, default=False, since='0.57.0'),
    KwargInfo('pic', (bool, NoneType), since='0.36.0'),
]

# The total list of arguments used by StaticLibrary
STATIC_LIB_KWS = [
    *_BUILD_TARGET_KWS,
    *_EXCLUSIVE_STATIC_LIB_KWS,
    *_EXCLUSIVE_LIB_KWS,
    _JAVA_LANG_KW,
]

# Arguments exclusive to SharedLibrary. These are separated to make integrating
# them into build_target easier
_EXCLUSIVE_SHARED_LIB_KWS: T.List[KwargInfo] = [
    _DARWIN_VERSIONS_KW,
    KwargInfo('soversion', (str, int, NoneType), convertor=lambda x: str(x) if x is not None else None),
    KwargInfo('version', (str, NoneType), validator=_validate_shlib_version),
]

# The total list of arguments used by SharedLibrary
SHARED_LIB_KWS = [
    *_BUILD_TARGET_KWS,
    *_EXCLUSIVE_SHARED_LIB_KWS,
    *_EXCLUSIVE_LIB_KWS,
    _VS_MODULE_DEFS_KW,
    _JAVA_LANG_KW,
]

# Arguments exclusive to SharedModule. These are separated to make integrating
# them into build_target easier
_EXCLUSIVE_SHARED_MOD_KWS: T.List[KwargInfo] = []

# The total list of arguments used by SharedModule
SHARED_MOD_KWS = [
    *_BUILD_TARGET_KWS,
    *_EXCLUSIVE_SHARED_MOD_KWS,
    *_EXCLUSIVE_LIB_KWS,
    _VS_MODULE_DEFS_KW,
    _JAVA_LANG_KW,
]

# Arguments exclusive to JAR. These are separated to make integrating
# them into build_target easier
_EXCLUSIVE_JAR_KWS: T.List[KwargInfo] = [
    KwargInfo('main_class', str, default=''),
    KwargInfo('java_resources', (StructuredSources, NoneType), since='0.62.0'),
    _JAVA_LANG_KW.evolve(deprecated=None, deprecated_message=None),
]

# The total list of arguments used by JAR
JAR_KWS = [
    *_ALL_TARGET_KWS,
    *_EXCLUSIVE_JAR_KWS,
    KwargInfo(
        'sources',
        ContainerTypeInfo(list, (str, File, CustomTarget, CustomTargetIndex, GeneratedList, ExtractedObjects, BuildTarget)),
        listify=True,
        default=[],
    ),
    *[a.evolve(deprecated='1.3.0', deprecated_message='This argument has never done anything in jar(), and should be removed')
      for a in _LANGUAGE_KWS],
]

_SHARED_STATIC_ARGS: T.List[KwargInfo[T.List[str]]] = [
    *[l.evolve(name=l.name.replace('_', '_static_'), since='1.3.0')
      for l in _LANGUAGE_KWS],
    *[l.evolve(name=l.name.replace('_', '_shared_'), since='1.3.0')
      for l in _LANGUAGE_KWS],
]

# Arguments used by both_library and library
LIBRARY_KWS = [
    *_BUILD_TARGET_KWS,
    *_EXCLUSIVE_LIB_KWS,
    *_EXCLUSIVE_SHARED_LIB_KWS,
    *_EXCLUSIVE_SHARED_MOD_KWS,
    *_EXCLUSIVE_STATIC_LIB_KWS,
    *_SHARED_STATIC_ARGS,
    _VS_MODULE_DEFS_KW,
    _JAVA_LANG_KW,
]

# Arguments used by build_Target
BUILD_TARGET_KWS = [
    *_BUILD_TARGET_KWS,
    *_EXCLUSIVE_SHARED_LIB_KWS,
    *_EXCLUSIVE_SHARED_MOD_KWS,
    *_EXCLUSIVE_STATIC_LIB_KWS,
    *_EXCLUSIVE_EXECUTABLE_KWS,
    *_SHARED_STATIC_ARGS,
    *[a.evolve(deprecated='1.3.0', deprecated_message='The use of "jar" in "build_target()" is deprecated, and this argument is only used by jar()')
      for a in _EXCLUSIVE_JAR_KWS],
    KwargInfo(
        'target_type',
        str,
        required=True,
        validator=in_set_validator({
            'executable', 'shared_library', 'static_library', 'shared_module',
            'both_libraries', 'library', 'jar'
        }),
        since_values={
            'shared_module': '0.51.0',
        },
        deprecated_values={
            'jar': ('1.3.0', 'use the "jar()" function directly'),
        }
    )
]

def _pkgconfig_define_convertor(x: T.List[str]) -> PkgConfigDefineType:
    if x:
        keys = itertools.islice(x, 0, None, 2)
        vals = itertools.islice(x, 1, None, 2)
        return tuple(zip(keys, vals))
    return None

PKGCONFIG_DEFINE_KW: KwargInfo = KwargInfo(
    'pkgconfig_define',
    ContainerTypeInfo(list, str, pairs=True),
    default=[],
    convertor=_pkgconfig_define_convertor,
)
