# Copyright(c) 2004, Karl Trygve Kalleberg <karltk@gentoo.org>
# Copyright(c) 2004-2024, Gentoo Authors
#
# Licensed under the GNU General Public License, v2

"""Provides an interface to package information stored by package managers.

The Package class is the heart of much of Gentoolkit. Given a CPV
(category/package-version) string, it can reveal the package's status in the
tree and VARDB (/var/db/), provide rich comparison and sorting, and expose
important parts of Portage's back-end.

Example usage:
        >>> portage = Package('sys-apps/portage-9999')
        >>> portage.ebuild_path()
        '/var/db/repos/gentoo/sys-apps/portage/portage-9999.ebuild'
        >>> portage.is_masked()
        True
        >>> portage.is_installed()
        False
"""

__all__ = ("Package", "PackageFormatter", "FORMAT_TMPL_VARS")

# =======
# Globals
# =======

FORMAT_TMPL_VARS = (
    "$location",
    "$mask",
    "$mask2",
    "$cp",
    "$cpv",
    "$category",
    "$name",
    "$version",
    "$revision",
    "$fullversion",
    "$slot",
    "$repo",
    "$keywords",
)

# =======
# Imports
# =======

import os
from string import Template

import portage
from portage.util import LazyItemsDict

import gentoolkit.pprinter as pp
from gentoolkit import errors
from gentoolkit.cpv import CPV
from gentoolkit.keyword import determine_keyword
from gentoolkit.flag import get_flags
from gentoolkit.eprefix import EPREFIX

# =======
# Settings
# =======


def _NewPortageConfig(local_config):
    ret = portage.config(
        local_config=local_config,
        eprefix=EPREFIX if EPREFIX else None,
        config_root=os.environ.get("PORTAGE_CONFIGROOT", None),
        target_root=os.environ.get("ROOT", None),
    )
    ret.lock()
    return ret


default_settings = _NewPortageConfig(local_config=True)
nolocal_settings = _NewPortageConfig(local_config=False)

# =======
# Classes
# =======


class Package(CPV):
    """Exposes the state of a given CPV."""

    def __init__(self, cpv, validate=False, local_config=True):
        if isinstance(cpv, CPV):
            self.__dict__.update(cpv.__dict__)
        else:
            CPV.__init__(self, cpv, validate=validate)

        if validate and not all(hasattr(self, x) for x in ("category", "version")):
            # CPV allows some things that Package must not
            raise errors.GentoolkitInvalidPackage(self.cpv)

        if local_config:
            self._settings = default_settings
        else:
            self._settings = nolocal_settings

        # Set dynamically
        self._package_path = None
        self._dblink = None
        self._metadata = None
        self._deps = None
        self._portdir_path = None

    def __repr__(self):
        return f"<{self.__class__.__name__} {self.cpv!r}>"

    def __hash__(self):
        return hash(self.cpv)

    def __contains__(self, key):
        return key in self.cpv

    def __str__(self):
        return str(self.cpv)

    @property
    def metadata(self):
        """Instantiate a L{portage.xml.MetaDataXML} object here."""

        from portage.xml.metadata import MetaDataXML

        if self._metadata is None:
            metadata_path = os.path.join(self.package_path(), "metadata.xml")
            projects_path = os.path.join(
                self._settings["PORTDIR"], "metadata/projects.xml"
            )

            try:
                self._metadata = MetaDataXML(metadata_path, projects_path)
            except OSError as error:
                import errno

                if error.errno != errno.ENOENT:
                    raise
                return None

        return self._metadata

    @property
    def dblink(self):
        """Instantiate a L{portage.dbapi.vartree.dblink} object here."""

        if self._dblink is None:
            self._dblink = portage.dblink(
                self.category,
                f"{self.name}-{self.fullversion}",
                self._settings["ROOT"],
                self._settings,
            )

        return self._dblink

    @property
    def deps(self):
        """Instantiate a L{gentoolkit.dependencies.Dependencies} object here."""

        from gentoolkit.dependencies import Dependencies

        if self._deps is None:
            self._deps = Dependencies(self.cpv)

        return self._deps

    def environment(self, envvars, prefer_vdb=True, fallback=True):
        """Returns one or more of the predefined environment variables.

        Some available envvars are:
        ----------------------
                BINPKGMD5  COUNTER         FEATURES   LICENSE  SRC_URI
                CATEGORY   CXXFLAGS        HOMEPAGE   PDEPEND  USE
                CBUILD     DEFINED_PHASES  INHERITED  PF
                CFLAGS     DEPEND          IUSE       PROVIDE
                CHOST      DESCRIPTION     KEYWORDS   RDEPEND
                CONTENTS   EAPI            LDFLAGS    SLOT

        Example usage:
                >>> pkg = Package('sys-apps/portage-9999')
                >>> pkg.environment('USE')
                ''
                >>> pkg.environment(('USE', 'IUSE'))
                ... # doctest: +NORMALIZE_WHITESPACE
                ['', 'build doc epydoc +ipc pypy1_9 python2 python3
                 selinux xattr']

        @type envvars: str or array
        @param envvars: one or more of (DEPEND, SRC_URI, etc.)
        @type prefer_vdb: bool
        @keyword prefer_vdb: if True, look in the vardb before portdb, else
                reverse order. Specifically KEYWORDS will get more recent
                information by preferring portdb.
        @type fallback: bool
        @keyword fallback: query only the preferred db if False
        @rtype: str or list
        @return: str if envvars is str, list if envvars is array
        @raise KeyError: if key is not found in requested db(s)
        """

        got_string = False
        if isinstance(envvars, str):
            got_string = True
            envvars = (envvars,)
        if prefer_vdb:
            try:
                result = portage.db[portage.root]["vartree"].dbapi.aux_get(
                    self.cpv, envvars
                )
            except KeyError:
                try:
                    if not fallback:
                        raise KeyError
                    result = portage.db[portage.root]["porttree"].dbapi.aux_get(
                        self.cpv, envvars
                    )
                except KeyError:
                    raise errors.GentoolkitFatalError(
                        "aux_get returned unexpected " "results"
                    )
        else:
            try:
                result = portage.db[portage.root]["porttree"].dbapi.aux_get(
                    self.cpv, envvars
                )
            except KeyError:
                try:
                    if not fallback:
                        raise KeyError
                    result = portage.db[portage.root]["vartree"].dbapi.aux_get(
                        self.cpv, envvars
                    )
                except KeyError:
                    raise errors.GentoolkitFatalError(
                        "aux_get returned unexpected " "results"
                    )

        if got_string:
            return result[0]
        return result

    def exists(self):
        """Return True if package exists in the Portage tree, else False"""

        return bool(portage.db[portage.root]["porttree"].dbapi.cpv_exists(self.cpv))

    def settings(self, key):
        """Returns the value of the given key for this package (useful
        for package.* files."""

        if self._settings.locked:
            self._settings.unlock()
        try:
            result = self._settings[key]
        finally:
            self._settings.lock()
        return result

    def mask_status(self):
        """Shortcut to L{portage.getmaskingstatus}.

        @rtype: None or list
        @return: a list containing none or some of:
                'profile'
                'package.mask'
                license(s)
                "kmask" keyword
                'missing keyword'
        """

        if self._settings.locked:
            self._settings.unlock()
        try:
            result = portage.getmaskingstatus(
                self.cpv,
                settings=self._settings,
                portdb=portage.db[portage.root]["porttree"].dbapi,
            )
        except KeyError:
            # getmaskingstatus doesn't support packages without ebuilds in the
            # Portage tree.
            result = None

        return result

    def mask_reason(self):
        """Shortcut to L{portage.getmaskingreason}.

        @rtype: None or tuple
        @return: empty tuple if pkg not masked OR
                ('mask reason', 'mask location')
        """

        try:
            result = portage.getmaskingreason(
                self.cpv,
                settings=self._settings,
                portdb=portage.db[portage.root]["porttree"].dbapi,
                return_location=True,
            )
            if result is None:
                result = tuple()
        except KeyError:
            # getmaskingstatus doesn't support packages without ebuilds in the
            # Portage tree.
            result = None

        return result

    def ebuild_path(self, in_vartree=False):
        """Returns the complete path to the .ebuild file.

        Example usage:
                >>> pkg = Package('sys-apps/portage-9999')
                >>> pkg.ebuild_path()
                '/var/db/repos/gentoo/sys-apps/portage/portage-9999.ebuild'
                >>> pkg.ebuild_path(in_vartree=True)
                '/var/db/pkg/sys-apps/portage-9999/portage-9999.ebuild'
        """

        if in_vartree:
            return portage.db[portage.root]["vartree"].dbapi.findname(self.cpv)
        return portage.db[portage.root]["porttree"].dbapi.findname(self.cpv)

    def package_path(self, in_vartree=False):
        """Return the path to where the ebuilds and other files reside."""

        if in_vartree:
            return self.dblink.getpath()
        return os.sep.join(self.ebuild_path().split(os.sep)[:-1])

    def repo_name(self, fallback=True):
        """Determine the repository name.

        @type fallback: bool
        @param fallback: if the repo_name file does not exist, return the
                repository name from the path
        @rtype: str
        @return: output of the repository metadata file, which stores the
                repo_name variable, or try to get the name of the repo from
                the path.
        @raise GentoolkitFatalError: if fallback is False and repo_name is
                not specified by the repository.
        """

        try:
            return self.environment("repository")
        except errors.GentoolkitFatalError:
            if fallback:
                return self.package_path().split(os.sep)[-3]
            raise

    def use(self):
        """Returns the USE flags active at time of installation."""

        return self.dblink.getstring("USE")

    def use_status(self):
        """Returns the USE flags active for installation."""

        iuse, final_flags = get_flags(self.cpv, final_setting=True)
        return final_flags

    def parsed_contents(self, prefix_root=False):
        """Returns the parsed CONTENTS file.

        @rtype: dict
        @return: {'/full/path/to/obj': ['type', 'timestamp', 'md5sum'], ...}
        """

        contents = self.dblink.getcontents()

        # Portage will automatically prepend ROOT.  Undo that.
        if not prefix_root:
            myroot = self._settings["ROOT"]
            if myroot != "/":
                ret = {}
                for key, val in self.dblink.getcontents().items():
                    ret["/" + os.path.relpath(key, myroot)] = val
                contents = ret

        return contents

    def size(self):
        """Estimates the installed size of the contents of this package.

        @rtype: tuple
        @return: (size, number of files in total, number of uncounted files)
        """

        seen = set()
        size = n_files = n_uncounted = 0
        for path in self.parsed_contents(prefix_root=True):
            try:
                st = os.lstat(path)
            except OSError:
                continue

            # Remove hardlinks by checking for duplicate inodes. Bug #301026.
            file_inode = st.st_ino
            if file_inode in seen:
                continue
            seen.add(file_inode)

            try:
                size += st.st_size
                n_files += 1
            except OSError:
                n_uncounted += 1

        return (size, n_files, n_uncounted)

    def is_installed(self):
        """Returns True if this package is installed (merged)."""

        return self.dblink.exists()

    def is_overlay(self):
        """Returns True if the package is in an overlay."""

        ebuild, tree = portage.db[portage.root]["porttree"].dbapi.findname2(self.cpv)
        if not ebuild:
            return None
        if self._portdir_path is None:
            self._portdir_path = os.path.realpath(self._settings["PORTDIR"])
        return tree and tree != self._portdir_path

    def is_masked(self):
        """Returns True if this package is masked against installation.

        @note: We blindly assume that the package actually exists on disk.
        """

        unmasked = portage.db[portage.root]["porttree"].dbapi.xmatch(
            "match-visible", self.cpv
        )
        return self.cpv not in unmasked

    @property
    def description(self):
        """Returns the DESCRIPTION from the ebuild

        @rtype: list
        """

        return portage.db[portage.root]["porttree"].dbapi.aux_get(
            self.cpv, ["DESCRIPTION"]
        )


class PackageFormatter:
    """When applied to a L{gentoolkit.package.Package} object, determine the
    location (Portage Tree vs. overlay), install status and masked status. That
    information can then be easily formatted and displayed.

    Example usage:
            >>> from gentoolkit.query import Query
            >>> from gentoolkit.package import PackageFormatter
            >>> import portage.output
            >>> q = Query('gcc')
            >>> pkgs = [PackageFormatter(x) for x in q.find()]
            >>> havecolor = portage.output.havecolor
            >>> portage.output.havecolor = False
            >>> for pkg in pkgs:
            ...     # Only print packages that are installed and from the Portage
            ...     # tree
            ...     if set('IP').issubset(pkg.location):
            ...             print(pkg)
            ...
            [IP-] [  ] sys-devel/gcc-4.5.4:4.5
            >>> portage.output.havecolor = havecolor

    @type pkg: L{gentoolkit.package.Package}
    @param pkg: package to format
    @type do_format: bool
    @param do_format: Whether to format the package name or not.
            Essentially C{do_format} should be set to False when piping or when
            quiet output is desired. If C{do_format} is False, only the location
            attribute will be created to save time.
    """

    _tmpl_verbose = "[$location] [$mask] $cpv:$slot"
    _tmpl_quiet = "$cpv"

    def __init__(self, pkg, do_format=True, custom_format=None):
        self._pkg = None
        self._do_format = do_format
        self._str = None
        self._location = None
        if not custom_format:
            if do_format:
                custom_format = self._tmpl_verbose
            else:
                custom_format = self._tmpl_quiet
        self.tmpl = Template(custom_format)
        self.format_vars = LazyItemsDict()
        self.pkg = pkg

    def __repr__(self):
        return f"<{self.__class__.__name__} {self.pkg} @{id(self):#8x}>"

    def __str__(self):
        if self._str is None:
            self._str = self.tmpl.safe_substitute(self.format_vars)
        return self._str

    @property
    def location(self):
        if self._location is None:
            self._location = self.format_package_location()
        return self._location

    @property
    def pkg(self):
        """Package to format"""
        return self._pkg

    @pkg.setter
    def pkg(self, value):
        if self._pkg == value:
            return
        self._pkg = value
        self._location = None

        fmt_vars = self.format_vars
        self.format_vars.clear()
        fmt_vars.addLazySingleton("location", lambda: getattr(self, "location"))
        fmt_vars.addLazySingleton("mask", self.format_mask)
        fmt_vars.addLazySingleton("mask2", self.format_mask_status2)
        fmt_vars.addLazySingleton("cpv", self.format_cpv)
        fmt_vars.addLazySingleton("cp", self.format_cpv, "cp")
        fmt_vars.addLazySingleton("category", self.format_cpv, "category")
        fmt_vars.addLazySingleton("name", self.format_cpv, "name")
        fmt_vars.addLazySingleton("version", self.format_cpv, "version")
        fmt_vars.addLazySingleton("revision", self.format_cpv, "revision")
        fmt_vars.addLazySingleton("fullversion", self.format_cpv, "fullversion")
        fmt_vars.addLazySingleton("slot", self.format_slot)
        fmt_vars.addLazySingleton("repo", self.pkg.repo_name)
        fmt_vars.addLazySingleton("keywords", self.format_keywords)

    def format_package_location(self):
        """Get the install status (in /var/db/?) and origin (from an overlay
        and the Portage tree?).

        @rtype: str
        @return: one of:
                'I--' : Installed but ebuild doesn't exist on system anymore
                '-P-' : Not installed and from the Portage tree
                '--O' : Not installed and from an overlay
                'IP-' : Installed and from the Portage tree
                'I-O' : Installed and from an overlay
        """

        result = ["-", "-", "-"]

        if self.pkg.is_installed():
            result[0] = "I"

        overlay = self.pkg.is_overlay()
        if overlay is None:
            pass
        elif overlay:
            result[2] = "O"
        else:
            result[1] = "P"

        return "".join(result)

    def format_mask_status(self):
        """Get the mask status of a given package.

        @rtype: tuple: (int, list)
        @return: int = an index for this list:
                ["  ", " ~", " -", "M ", "M~", "M-", "??"]
                0 = not masked
                1 = keyword masked
                2 = arch masked
                3 = hard masked
                4 = hard and keyword masked,
                5 = hard and arch masked
                6 = ebuild doesn't exist on system anymore

                list = original output of portage.getmaskingstatus
        """

        result = 0
        masking_status = self.pkg.mask_status()
        if masking_status is None:
            return (6, [])

        if ("~%s keyword" % self.pkg.settings("ARCH")) in masking_status:
            result += 1
        if "missing keyword" in masking_status:
            result += 2
        if {"profile", "package.mask"}.intersection(masking_status):
            result += 3

        return (result, masking_status)

    def format_mask_status2(self):
        """Get the mask status of a given package."""
        mask = self.pkg.mask_status()
        if mask:
            return pp.masking(mask)
        else:
            arch = self.pkg.settings("ARCH")
            keywords = self.pkg.environment("KEYWORDS")
            mask = [
                determine_keyword(arch, portage.settings["ACCEPT_KEYWORDS"], keywords)
            ]
        return pp.masking(mask)

    def format_mask(self):
        maskmodes = ["  ", " ~", " -", "M ", "M~", "M-", "??"]
        maskmode = maskmodes[self.format_mask_status()[0]]
        return pp.keyword(
            maskmode,
            stable=not maskmode.strip(),
            hard_masked={"M", "?", "-"}.intersection(maskmode),
        )

    def format_cpv(self, attr=None):
        if attr is None:
            value = self.pkg.cpv
        else:
            value = getattr(self.pkg, attr)
        if self._do_format:
            return pp.cpv(value)
        else:
            return value

    def format_slot(self):
        value = self.pkg.environment("SLOT")
        if self._do_format:
            return pp.slot(value)
        else:
            return value

    def format_keywords(self):
        value = self.pkg.environment("KEYWORDS")
        if self._do_format:
            return pp.keyword(value)
        else:
            return value


# vim: set ts=4 sw=4 tw=79:
