from __future__ import annotations

import copy
import re

from contextlib import contextmanager
from pathlib import Path
from typing import TYPE_CHECKING
from typing import Collection
from typing import Iterable
from typing import Iterator
from typing import TypeVar

from poetry.core.constraints.version import parse_constraint
from poetry.core.constraints.version.exceptions import ParseConstraintError
from poetry.core.packages.dependency_group import MAIN_GROUP
from poetry.core.packages.specification import PackageSpecification
from poetry.core.packages.utils.utils import create_nested_marker
from poetry.core.version.exceptions import InvalidVersion
from poetry.core.version.markers import parse_marker


if TYPE_CHECKING:
    from packaging.utils import NormalizedName

    from poetry.core.constraints.version import Version
    from poetry.core.constraints.version import VersionConstraint
    from poetry.core.packages.dependency import Dependency
    from poetry.core.packages.dependency_group import DependencyGroup
    from poetry.core.spdx.license import License
    from poetry.core.version.markers import BaseMarker

    T = TypeVar("T", bound="Package")

AUTHOR_REGEX = re.compile(r"(?u)^(?P<name>[- .,\w\d'’\"():&]+)(?: <(?P<email>.+?)>)?$")


class Package(PackageSpecification):
    AVAILABLE_PYTHONS = {
        "2",
        "2.7",
        "3",
        "3.4",
        "3.5",
        "3.6",
        "3.7",
        "3.8",
        "3.9",
        "3.10",
        "3.11",
    }

    def __init__(
        self,
        name: str,
        version: str | Version,
        pretty_version: str | None = None,
        source_type: str | None = None,
        source_url: str | None = None,
        source_reference: str | None = None,
        source_resolved_reference: str | None = None,
        source_subdirectory: str | None = None,
        features: Iterable[str] | None = None,
        develop: bool = False,
        yanked: str | bool = False,
    ) -> None:
        """
        Creates a new in memory package.
        """
        from poetry.core.version.markers import AnyMarker

        super().__init__(
            name,
            source_type=source_type,
            source_url=source_url,
            source_reference=source_reference,
            source_resolved_reference=source_resolved_reference,
            source_subdirectory=source_subdirectory,
            features=features,
        )

        self._set_version(version, pretty_version)

        self.description = ""

        self._authors: list[str] = []
        self._maintainers: list[str] = []

        self.homepage: str | None = None
        self.repository_url: str | None = None
        self.documentation_url: str | None = None
        self.keywords: list[str] = []
        self._license: License | None = None
        self.readmes: tuple[Path, ...] = ()

        self.extras: dict[NormalizedName, list[Dependency]] = {}

        self._dependency_groups: dict[str, DependencyGroup] = {}

        # For compatibility with previous version, we keep the category
        self.category = "main"
        self.files: list[dict[str, str]] = []
        self.optional = False

        self.classifiers: list[str] = []

        self._python_versions = "*"
        self._python_constraint = parse_constraint("*")
        self._python_marker: BaseMarker = AnyMarker()

        self.platform = None
        self.marker: BaseMarker = AnyMarker()

        self.root_dir: Path | None = None

        self.develop = develop

        self._yanked = yanked

    @property
    def name(self) -> NormalizedName:
        return self._name

    @property
    def pretty_name(self) -> str:
        return self._pretty_name

    @property
    def version(self) -> Version:
        return self._version

    @property
    def pretty_version(self) -> str:
        return self._pretty_version

    @property
    def unique_name(self) -> str:
        if self.is_root():
            return self._name

        return self.complete_name + "-" + self._version.text

    @property
    def pretty_string(self) -> str:
        return self.pretty_name + " " + self.pretty_version

    @property
    def full_pretty_version(self) -> str:
        if self.source_type in ["file", "directory", "url"]:
            return f"{self._pretty_version} {self.source_url}"

        if self.source_type not in ["hg", "git"]:
            return self._pretty_version

        ref: str | None
        if self.source_resolved_reference and len(self.source_resolved_reference) == 40:
            ref = self.source_resolved_reference[0:7]
            return f"{self._pretty_version} {ref}"

        # if source reference is a sha1 hash -- truncate
        if self.source_reference and len(self.source_reference) == 40:
            return f"{self._pretty_version} {self.source_reference[0:7]}"

        ref = self._source_resolved_reference or self._source_reference
        return f"{self._pretty_version} {ref}"

    @property
    def authors(self) -> list[str]:
        return self._authors

    @property
    def author_name(self) -> str | None:
        return self._get_author()["name"]

    @property
    def author_email(self) -> str | None:
        return self._get_author()["email"]

    @property
    def maintainers(self) -> list[str]:
        return self._maintainers

    @property
    def maintainer_name(self) -> str | None:
        return self._get_maintainer()["name"]

    @property
    def maintainer_email(self) -> str | None:
        return self._get_maintainer()["email"]

    @property
    def requires(self) -> list[Dependency]:
        """
        Returns the main dependencies
        """
        if not self._dependency_groups or MAIN_GROUP not in self._dependency_groups:
            return []

        return self._dependency_groups[MAIN_GROUP].dependencies

    @property
    def all_requires(
        self,
    ) -> list[Dependency]:
        """
        Returns the main dependencies and group dependencies.
        """
        return [
            dependency
            for group in self._dependency_groups.values()
            for dependency in group.dependencies
        ]

    def _set_version(
        self, version: str | Version, pretty_version: str | None = None
    ) -> None:
        from poetry.core.constraints.version import Version

        if not isinstance(version, Version):
            try:
                version = Version.parse(version)
            except InvalidVersion:
                raise InvalidVersion(
                    f"Invalid version '{version}' on package {self.name}"
                )

        self._version = version
        self._pretty_version = pretty_version or version.text

    def _get_author(self) -> dict[str, str | None]:
        if not self._authors:
            return {"name": None, "email": None}

        m = AUTHOR_REGEX.match(self._authors[0])

        if m is None:
            raise ValueError(
                "Invalid author string. Must be in the format: "
                "John Smith <john@example.com>"
            )

        name = m.group("name")
        email = m.group("email")

        return {"name": name, "email": email}

    def _get_maintainer(self) -> dict[str, str | None]:
        if not self._maintainers:
            return {"name": None, "email": None}

        m = AUTHOR_REGEX.match(self._maintainers[0])

        if m is None:
            raise ValueError(
                "Invalid maintainer string. Must be in the format: "
                "John Smith <john@example.com>"
            )

        name = m.group("name")
        email = m.group("email")

        return {"name": name, "email": email}

    @property
    def python_versions(self) -> str:
        return self._python_versions

    @python_versions.setter
    def python_versions(self, value: str) -> None:
        try:
            constraint = parse_constraint(value)
        except ParseConstraintError:
            raise ParseConstraintError(f"Invalid python versions '{value}' on {self}")

        self._python_versions = value
        self._python_constraint = constraint
        self._python_marker = parse_marker(
            create_nested_marker("python_version", self._python_constraint)
        )

    @property
    def python_constraint(self) -> VersionConstraint:
        return self._python_constraint

    @property
    def python_marker(self) -> BaseMarker:
        return self._python_marker

    @property
    def license(self) -> License | None:
        return self._license

    @license.setter
    def license(self, value: str | License | None) -> None:
        from poetry.core.spdx.helpers import license_by_id
        from poetry.core.spdx.license import License

        if value is None or isinstance(value, License):
            self._license = value
        else:
            self._license = license_by_id(value)

    @property
    def all_classifiers(self) -> list[str]:
        from poetry.core.constraints.version import Version

        classifiers = copy.copy(self.classifiers)

        # Automatically set python classifiers
        if self.python_versions == "*":
            python_constraint = parse_constraint("~2.7 || ^3.4")
        else:
            python_constraint = self.python_constraint

        python_classifier_prefix = "Programming Language :: Python"
        python_classifiers = []

        # we sort python versions by sorting an int tuple of (major, minor) version
        # to ensure we sort 3.10 after 3.9
        for version in sorted(
            self.AVAILABLE_PYTHONS, key=lambda x: tuple(map(int, x.split(".")))
        ):
            if len(version) == 1:
                constraint = parse_constraint(version + ".*")
            else:
                constraint = Version.parse(version)

            if python_constraint.allows_any(constraint):
                classifier = f"{python_classifier_prefix} :: {version}"
                if classifier not in python_classifiers:
                    python_classifiers.append(classifier)

        # Automatically set license classifiers
        if self.license:
            classifiers.append(self.license.classifier)

        # Sort classifiers and insert python classifiers at the right location. We do
        # it like this so that 3.10 is sorted after 3.9.
        sorted_classifiers = []
        python_classifiers_inserted = False
        for classifier in sorted(set(classifiers)):
            if (
                not python_classifiers_inserted
                and classifier > python_classifier_prefix
            ):
                sorted_classifiers.extend(python_classifiers)
                python_classifiers_inserted = True
            sorted_classifiers.append(classifier)

        if not python_classifiers_inserted:
            sorted_classifiers.extend(python_classifiers)

        return sorted_classifiers

    @property
    def urls(self) -> dict[str, str]:
        urls = {}

        if self.homepage:
            urls["Homepage"] = self.homepage

        if self.repository_url:
            urls["Repository"] = self.repository_url

        if self.documentation_url:
            urls["Documentation"] = self.documentation_url

        return urls

    @property
    def readme(self) -> Path | None:
        import warnings

        warnings.warn(
            "`readme` is deprecated: you are getting only the first readme file. Please"
            " use the plural form `readmes`.",
            DeprecationWarning,
        )
        return next(iter(self.readmes), None)

    @readme.setter
    def readme(self, path: Path) -> None:
        import warnings

        warnings.warn(
            "`readme` is deprecated. Please assign a tuple to the plural form"
            " `readmes`.",
            DeprecationWarning,
        )
        self.readmes = (path,)

    @property
    def yanked(self) -> bool:
        return isinstance(self._yanked, str) or bool(self._yanked)

    @property
    def yanked_reason(self) -> str:
        if isinstance(self._yanked, str):
            return self._yanked
        return ""

    def is_prerelease(self) -> bool:
        return self._version.is_unstable()

    def is_root(self) -> bool:
        return False

    def dependency_group_names(self, include_optional: bool = False) -> set[str]:
        return {
            name
            for name, group in self._dependency_groups.items()
            if not group.is_optional() or include_optional
        }

    def add_dependency_group(self, group: DependencyGroup) -> None:
        self._dependency_groups[group.name] = group

    def has_dependency_group(self, name: str) -> bool:
        return name in self._dependency_groups

    def dependency_group(self, name: str) -> DependencyGroup:
        if not self.has_dependency_group(name):
            raise ValueError(f'The dependency group "{name}" does not exist.')

        return self._dependency_groups[name]

    def add_dependency(
        self,
        dependency: Dependency,
    ) -> Dependency:
        from poetry.core.packages.dependency_group import DependencyGroup

        for group_name in dependency.groups:
            if group_name not in self._dependency_groups:
                # Dynamically add the dependency group
                self.add_dependency_group(DependencyGroup(group_name))

            self._dependency_groups[group_name].add_dependency(dependency)

        return dependency

    def without_dependency_groups(self: T, groups: Collection[str]) -> T:
        """
        Returns a clone of the package with the given dependency groups excluded.
        """
        package = self.clone()

        for group_name in groups:
            if group_name in package._dependency_groups:
                del package._dependency_groups[group_name]

        return package

    def without_optional_dependency_groups(self: T) -> T:
        """
        Returns a clone of the package without optional dependency groups.
        """
        package = self.clone()

        for group_name, group in self._dependency_groups.items():
            if group.is_optional():
                del package._dependency_groups[group_name]

        return package

    def with_dependency_groups(
        self: T, groups: Collection[str], only: bool = False
    ) -> T:
        """
        Returns a clone of the package with the given dependency groups opted in.

        Note that it will return all dependencies across all groups
        more the given, optional, groups.

        If `only` is set to True, then only the given groups will be selected.
        """
        package = self.clone()

        for group_name, group in self._dependency_groups.items():
            if (only or group.is_optional()) and group_name not in groups:
                del package._dependency_groups[group_name]

        return package

    def to_dependency(self) -> Dependency:
        from pathlib import Path

        from poetry.core.packages.dependency import Dependency
        from poetry.core.packages.directory_dependency import DirectoryDependency
        from poetry.core.packages.file_dependency import FileDependency
        from poetry.core.packages.url_dependency import URLDependency
        from poetry.core.packages.vcs_dependency import VCSDependency

        dep: Dependency
        if self.source_type == "directory":
            assert self._source_url is not None
            dep = DirectoryDependency(
                self._name,
                Path(self._source_url),
                groups=list(self._dependency_groups.keys()),
                optional=self.optional,
                base=self.root_dir,
                develop=self.develop,
                extras=self.features,
            )
        elif self.source_type == "file":
            assert self._source_url is not None
            dep = FileDependency(
                self._name,
                Path(self._source_url),
                groups=list(self._dependency_groups.keys()),
                optional=self.optional,
                base=self.root_dir,
                extras=self.features,
            )
        elif self.source_type == "url":
            assert self._source_url is not None
            dep = URLDependency(
                self._name,
                self._source_url,
                directory=self.source_subdirectory,
                groups=list(self._dependency_groups.keys()),
                optional=self.optional,
                extras=self.features,
            )
        elif self.source_type == "git":
            assert self._source_url is not None
            dep = VCSDependency(
                self._name,
                self.source_type,
                self._source_url,
                rev=self.source_reference,
                resolved_rev=self.source_resolved_reference,
                directory=self.source_subdirectory,
                groups=list(self._dependency_groups.keys()),
                optional=self.optional,
                develop=self.develop,
                extras=self.features,
            )
        else:
            dep = Dependency(self._name, self._version, extras=self.features)

        if not self.marker.is_any():
            dep.marker = self.marker

        if not self.python_constraint.is_any():
            dep.python_versions = self.python_versions

        if not self.is_direct_origin():
            return dep

        return dep.with_constraint(self._version)

    @contextmanager
    def with_python_versions(self, python_versions: str) -> Iterator[None]:
        original_python_versions = self.python_versions

        self.python_versions = python_versions

        yield

        self.python_versions = original_python_versions

    def satisfies(
        self, dependency: Dependency, ignore_source_type: bool = False
    ) -> bool:
        """
        Helper method to check if this package satisfies a given dependency.

        This is determined by assessing if this instance provides the package specified
        by the given dependency. Further, version and source types are checked.
        """
        if self.name != dependency.name:
            return False

        if not dependency.constraint.allows(self.version):
            return False

        if not ignore_source_type and not self.source_satisfies(dependency):
            return False

        return True

    def source_satisfies(self, dependency: Dependency) -> bool:
        """Determine whether this package's source satisfies the given dependency."""
        if dependency.source_type is None:
            if dependency.source_name is None:
                # The dependency doesn't care about the source, so this package
                # certainly satisfies it.
                return True

            # The dependency specifies a source_name but not a type: it wants either
            # pypi or a legacy repository.
            #
            # - If this package has no source type then it's from pypi, so it
            #   matches if and only if that's what the dependency wants
            # - Else this package is a match if and only if it is from the desired
            #   repository
            if self.source_type is None:
                return dependency.source_name.lower() == "pypi"

            return (
                self.source_type == "legacy"
                and self.source_reference is not None
                and self.source_reference.lower() == dependency.source_name.lower()
            )

        # The dependency specifies a source: this package matches if and only if it is
        # from that source.
        return dependency.is_same_source_as(self)

    def __eq__(self, other: object) -> bool:
        if not isinstance(other, Package):
            return NotImplemented

        return super().__eq__(other) and self._version == other.version

    def __hash__(self) -> int:
        return super().__hash__() ^ hash(self._version)

    def __str__(self) -> str:
        return f"{self.complete_name} ({self.full_pretty_version})"

    def __repr__(self) -> str:
        args = [repr(self._name), repr(self._version.text)]

        if self._features:
            args.append(f"features={repr(self._features)}")

        if self._source_type:
            args.append(f"source_type={repr(self._source_type)}")
            args.append(f"source_url={repr(self._source_url)}")

            if self._source_reference:
                args.append(f"source_reference={repr(self._source_reference)}")

            if self._source_resolved_reference:
                args.append(
                    f"source_resolved_reference={repr(self._source_resolved_reference)}"
                )
            if self._source_subdirectory:
                args.append(f"source_subdirectory={repr(self._source_subdirectory)}")

        args_str = ", ".join(args)
        return f"Package({args_str})"
