# -*- coding: utf-8 -*-


# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <https://gnu.org/licenses/>.


"""
The KojiPackageSet object obtains the latest RPMs from a Koji tag.
It automatically finds a signed copies according to *sigkey_ordering*.
"""

import itertools
import os
from six.moves import cPickle as pickle

import kobo.log
import kobo.pkgset
import kobo.rpmlib

from kobo.threads import WorkerThread, ThreadPool

import pungi.wrappers.kojiwrapper
from pungi.util import pkg_is_srpm
from pungi.arch import get_valid_arches, is_excluded


class ReaderPool(ThreadPool):
    def __init__(self, package_set, logger=None):
        ThreadPool.__init__(self, logger)
        self.package_set = package_set


class ReaderThread(WorkerThread):
    def process(self, item, num):
        # rpm_info, build_info = item

        if (num % 100 == 0) or (num == self.pool.queue_total):
            self.pool.package_set.log_debug("Processed %s out of %s packages"
                                            % (num, self.pool.queue_total))

        rpm_path = self.pool.package_set.get_package_path(item)
        if rpm_path is None:
            return

        # In case we have old file cache data, try to reuse it.
        if self.pool.package_set.old_file_cache:
            # The kobo.pkgset.FileCache does not have any method to check if
            # the RPM is in cache. Instead it just re-uses the cached RPM data,
            # if available, in .add() method.
            # Therefore we call `old_file_cache.add()` which either returns the
            # cached RPM object fast or just loads it from filesystem. We then
            # add the returned RPM object to real `file_cache` directly.
            rpm_obj = self.pool.package_set.old_file_cache.add(rpm_path)
            self.pool.package_set.file_cache[rpm_path] = rpm_obj
        else:
            rpm_obj = self.pool.package_set.file_cache.add(rpm_path)
        self.pool.package_set.rpms_by_arch.setdefault(rpm_obj.arch, []).append(rpm_obj)

        if pkg_is_srpm(rpm_obj):
            self.pool.package_set.srpms_by_name[rpm_obj.file_name] = rpm_obj
        elif rpm_obj.arch == "noarch":
            srpm = self.pool.package_set.srpms_by_name.get(rpm_obj.sourcerpm, None)
            if srpm:
                # HACK: copy {EXCLUDE,EXCLUSIVE}ARCH from SRPM to noarch RPMs
                rpm_obj.excludearch = srpm.excludearch
                rpm_obj.exclusivearch = srpm.exclusivearch
            else:
                self.pool.log_warning("Can't find a SRPM for %s" % rpm_obj.file_name)


class PackageSetBase(kobo.log.LoggingBase):

    def __init__(self, sigkey_ordering, arches=None, logger=None,
                 allow_invalid_sigkeys=False):
        super(PackageSetBase, self).__init__(logger=logger)
        self.file_cache = kobo.pkgset.FileCache(kobo.pkgset.SimpleRpmWrapper)
        self.old_file_cache = None
        self.sigkey_ordering = sigkey_ordering or [None]
        self.arches = arches
        self.rpms_by_arch = {}
        self.srpms_by_name = {}
        # RPMs not found for specified sigkeys
        self._invalid_sigkey_rpms = []
        self._allow_invalid_sigkeys = allow_invalid_sigkeys

    @property
    def invalid_sigkey_rpms(self):
        return self._invalid_sigkey_rpms

    def __getitem__(self, name):
        return self.file_cache[name]

    def __len__(self):
        return len(self.file_cache)

    def __iter__(self):
        for i in self.file_cache:
            yield i

    def __getstate__(self):
        result = self.__dict__.copy()
        del result["_logger"]
        return result

    def __setstate__(self, data):
        self._logger = None
        self.__dict__.update(data)

    def raise_invalid_sigkeys_exception(self, rpminfos):
        """
        Raises RuntimeError containing details of RPMs with invalid
        sigkeys defined in `rpminfos`.
        """
        def nvr_formatter(package_info):
            # joins NVR parts of the package with '-' character.
            return '-'.join((package_info['name'], package_info['version'], package_info['release']))
        raise RuntimeError(
            "RPM(s) not found for sigs: %s. Check log for details. Unsigned packages:\n%s" % (
                self.sigkey_ordering,
                '\n'.join(sorted(set([nvr_formatter(rpminfo) for rpminfo in rpminfos])))))

    def read_packages(self, rpms, srpms):
        srpm_pool = ReaderPool(self, self._logger)
        rpm_pool = ReaderPool(self, self._logger)

        for i in rpms:
            rpm_pool.queue_put(i)

        for i in srpms:
            srpm_pool.queue_put(i)

        thread_count = 10
        for i in range(thread_count):
            srpm_pool.add(ReaderThread(srpm_pool))
            rpm_pool.add(ReaderThread(rpm_pool))

        # process SRC and NOSRC packages first (see ReaderTread for the
        # EXCLUDEARCH/EXCLUSIVEARCH hack for noarch packages)
        self.log_debug("Package set: spawning %s worker threads (SRPMs)" % thread_count)
        srpm_pool.start()
        srpm_pool.stop()
        self.log_debug("Package set: worker threads stopped (SRPMs)")

        self.log_debug("Package set: spawning %s worker threads (RPMs)" % thread_count)
        rpm_pool.start()
        rpm_pool.stop()
        self.log_debug("Package set: worker threads stopped (RPMs)")

        if not self._allow_invalid_sigkeys and self._invalid_sigkey_rpms:
            self.raise_invalid_sigkeys_exception(self._invalid_sigkey_rpms)

        return self.rpms_by_arch

    def merge(self, other, primary_arch, arch_list, exclusive_noarch=True):
        """
        Merge ``other`` package set into this instance.
        """
        msg = "Merging package sets for %s: %s" % (primary_arch, arch_list)
        self.log_debug("[BEGIN] %s" % msg)

        # if "src" is present, make sure "nosrc" is included too
        if "src" in arch_list and "nosrc" not in arch_list:
            arch_list.append("nosrc")

        # make sure sources are processed last
        for i in ("nosrc", "src"):
            if i in arch_list:
                arch_list.remove(i)
                arch_list.append(i)

        seen_sourcerpms = set()
        # {Exclude,Exclusive}Arch must match *tree* arch + compatible native
        # arches (excluding multilib arches)
        if primary_arch:
            exclusivearch_list = get_valid_arches(
                primary_arch, multilib=False, add_noarch=False, add_src=False)
            # We don't want to consider noarch: if a package is true noarch
            # build (not just a subpackage), it has to have noarch in
            # ExclusiveArch otherwise rpm will refuse to build it.
            # This should eventually become a default, but it could have a big
            # impact and thus it's hidden behind an option.
            if not exclusive_noarch and 'noarch' in exclusivearch_list:
                exclusivearch_list.remove('noarch')
        else:
            exclusivearch_list = None
        for arch in arch_list:
            self.rpms_by_arch.setdefault(arch, [])
            for i in other.rpms_by_arch.get(arch, []):
                if i.file_path in self.file_cache:
                    # TODO: test if it really works
                    continue
                if exclusivearch_list and arch == "noarch":
                    if is_excluded(i, exclusivearch_list, logger=self._logger):
                        continue

                if arch in ("nosrc", "src"):
                    # include only sources having binary packages
                    if i.name not in seen_sourcerpms:
                        continue
                else:
                    sourcerpm_name = kobo.rpmlib.parse_nvra(i.sourcerpm)["name"]
                    seen_sourcerpms.add(sourcerpm_name)

                self.file_cache.file_cache[i.file_path] = i
                self.rpms_by_arch[arch].append(i)

        self.log_debug("[DONE ] %s" % msg)

    def fast_merge(self, other):
        """
        Merge two package sets together without any filtering of packages. All
        packages from `other` package set are taken.
        """
        for arch in other.rpms_by_arch.keys():
            self.rpms_by_arch.setdefault(arch, [])
            for i in other.rpms_by_arch.get(arch, []):
                self.file_cache.file_cache[i.file_path] = i
                self.rpms_by_arch[arch].append(i)

    def save_file_list(self, file_path, remove_path_prefix=None):
        with open(file_path, "w") as f:
            for arch in sorted(self.rpms_by_arch):
                for i in self.rpms_by_arch[arch]:
                    rpm_path = i.file_path
                    if remove_path_prefix and rpm_path.startswith(remove_path_prefix):
                        rpm_path = rpm_path[len(remove_path_prefix):]
                    f.write("%s\n" % rpm_path)

    def load_old_file_cache(self, file_path):
        """
        Loads the cached FileCache stored in pickle format in `file_path`.
        """
        with open(file_path, "rb") as f:
            self.old_file_cache = pickle.load(f)

    def save_file_cache(self, file_path):
        """
        Saves the current FileCache using the pickle module to `file_path`.
        """
        with open(file_path, 'wb') as f:
            pickle.dump(self.file_cache, f)


class FilelistPackageSet(PackageSetBase):
    def get_package_path(self, queue_item):
        # TODO: sigkey checking
        rpm_path = os.path.abspath(queue_item)
        return rpm_path

    def populate(self, file_list):
        result_rpms = []
        result_srpms = []
        msg = "Getting RPMs from file list"
        self.log_info("[BEGIN] %s" % msg)
        for i in file_list:
            if i.endswith(".src.rpm") or i.endswith(".nosrc.rpm"):
                result_srpms.append(i)
            else:
                result_rpms.append(i)
        result = self.read_packages(result_rpms, result_srpms)
        self.log_info("[DONE ] %s" % msg)
        return result


class KojiPackageSet(PackageSetBase):
    def __init__(self, koji_wrapper, sigkey_ordering, arches=None, logger=None,
                 packages=None, allow_invalid_sigkeys=False,
                 populate_only_packages=False):
        """
        Creates new KojiPackageSet.

        :param list sigkey_ordering: Ordered list of sigkey strings. When
            getting package from Koji, KojiPackageSet tries to get the package
            signed by sigkey from this list. If None or "" appears in this
            list, unsigned package is used.
        :param list arches: List of arches to get the packages for.
        :param logging.Logger logger: Logger instance to use for logging.
        :param list packages: List of package names to be used when
            `allow_invalid_sigkeys` or `populate_only_packages` is set.
        :param bool allow_invalid_sigkeys: When True, packages *not* listed in
            the `packages` list are added to KojiPackageSet even if they have
            invalid sigkey. This is useful in case Koji tag contains some
            unsigned packages, but we know they won't appear in a compose.
            When False, all packages in Koji tag must have valid sigkey as
            defined in `sigkey_ordering`.
        :param bool populate_only_packages. When True, only packages in
            `packages` list are added to KojiPackageSet. This can save time
            when generating compose from predefined list of packages from big
            Koji tag.
            When False, all packages from Koji tag are added to KojiPackageSet.
        """
        super(KojiPackageSet, self).__init__(sigkey_ordering=sigkey_ordering,
                                             arches=arches, logger=logger,
                                             allow_invalid_sigkeys=allow_invalid_sigkeys)
        self.koji_wrapper = koji_wrapper
        # Names of packages to look for in the Koji tag.
        self.packages = set(packages or [])
        self.populate_only_packages = populate_only_packages

    def __getstate__(self):
        result = self.__dict__.copy()
        result["koji_profile"] = self.koji_wrapper.profile
        del result["koji_wrapper"]
        del result["_logger"]
        return result

    def __setstate__(self, data):
        koji_profile = data.pop("koji_profile")
        self.koji_wrapper = pungi.wrappers.kojiwrapper.KojiWrapper(koji_profile)
        self._logger = None
        self.__dict__.update(data)

    @property
    def koji_proxy(self):
        return self.koji_wrapper.koji_proxy

    def get_latest_rpms(self, tag, event, inherit=True):
        return self.koji_proxy.listTaggedRPMS(tag, event=event, inherit=inherit, latest=True)

    def get_package_path(self, queue_item):
        rpm_info, build_info = queue_item
        pathinfo = self.koji_wrapper.koji_module.pathinfo
        paths = []
        for sigkey in self.sigkey_ordering:
            if not sigkey:
                # we're looking for *signed* copies here
                continue
            sigkey = sigkey.lower()
            rpm_path = os.path.join(pathinfo.build(build_info), pathinfo.signed(rpm_info, sigkey))
            paths.append(rpm_path)
            if os.path.isfile(rpm_path):
                return rpm_path

        if None in self.sigkey_ordering or '' in self.sigkey_ordering:
            # use an unsigned copy (if allowed)
            rpm_path = os.path.join(pathinfo.build(build_info), pathinfo.rpm(rpm_info))
            paths.append(rpm_path)
            if os.path.isfile(rpm_path):
                return rpm_path

        if self._allow_invalid_sigkeys and rpm_info["name"] not in self.packages:
            # use an unsigned copy (if allowed)
            rpm_path = os.path.join(pathinfo.build(build_info), pathinfo.rpm(rpm_info))
            paths.append(rpm_path)
            if os.path.isfile(rpm_path):
                self._invalid_sigkey_rpms.append(rpm_info)
                return rpm_path

        self._invalid_sigkey_rpms.append(rpm_info)
        self.log_error("RPM %s not found for sigs: %s. Paths checked: %s"
                       % (rpm_info, self.sigkey_ordering, paths))
        return None

    def populate(
        self, tag, event=None, inherit=True, logfile=None, exclude_packages=None
    ):
        """Populate the package set with packages from given tag.

        :param event: the Koji event to query at (or latest if not given)
        :param inherit: whether to enable tag inheritance
        :param logfile: path to file where package source tags should be logged
        :param exclude_packages: an iterable of package names that should be ignored
        """
        result_rpms = []
        result_srpms = []
        exclude_packages = set(exclude_packages or [])

        if type(event) is dict:
            event = event["id"]

        msg = "Getting latest RPMs (tag: %s, event: %s, inherit: %s)" % (tag, event, inherit)
        self.log_info("[BEGIN] %s" % msg)
        rpms, builds = self.get_latest_rpms(tag, event, inherit=inherit)

        builds_by_id = {}
        for build_info in builds:
            builds_by_id.setdefault(build_info["build_id"], build_info)

        skipped_arches = []
        skipped_packages_count = 0
        # We need to process binary packages first, and then source packages.
        # If we have a list of packages to use, we need to put all source rpms
        # names into it. Otherwise if the SRPM name does not occur on the list,
        # it would be missing from the package set. Even if it ultimately does
        # not end in the compose, we need it to extract ExcludeArch and
        # ExclusiveArch for noarch packages.
        for rpm_info in itertools.chain((rpm for rpm in rpms if not _is_src(rpm)),
                                        (rpm for rpm in rpms if _is_src(rpm))):
            if self.arches and rpm_info["arch"] not in self.arches:
                if rpm_info["arch"] not in skipped_arches:
                    self.log_debug("Skipping packages for arch: %s" % rpm_info["arch"])
                    skipped_arches.append(rpm_info["arch"])
                continue

            if exclude_packages and rpm_info["name"] in exclude_packages and rpm_info["arch"] != "src":
                self.log_debug(
                    "Skipping %(name)s-%(version)s-%(release)s.%(arch)s" % rpm_info
                )
                continue

            if (self.populate_only_packages and self.packages and
                    rpm_info['name'] not in self.packages):
                skipped_packages_count += 1
                continue

            build_info = builds_by_id[rpm_info["build_id"]]
            if _is_src(rpm_info):
                result_srpms.append((rpm_info, build_info))
            else:
                result_rpms.append((rpm_info, build_info))
                if self.populate_only_packages and self.packages:
                    # Only add the package if we already have some whitelist.
                    self.packages.add(build_info['name'])

        if skipped_packages_count:
            self.log_debug("Skipped %d packages, not marked as to be "
                           "included in a compose." % skipped_packages_count)

        result = self.read_packages(result_rpms, result_srpms)

        # Check that after reading the packages, every package that is
        # included in a compose has the right sigkey.
        if self._invalid_sigkey_rpms:
            invalid_sigkey_rpms = [rpm for rpm in self._invalid_sigkey_rpms
                                   if rpm["name"] in self.packages]
            if invalid_sigkey_rpms:
                self.raise_invalid_sigkeys_exception(invalid_sigkey_rpms)

        # Create a log with package NEVRAs and the tag they are coming from
        if logfile:
            with open(logfile, 'w') as f:
                for rpm in rpms:
                    build = builds_by_id[rpm['build_id']]
                    f.write('{name}-{ep}:{version}-{release}.{arch}: {tag} [{tag_id}]\n'.format(
                        tag=build['tag_name'], tag_id=build['tag_id'], ep=rpm['epoch'] or 0, **rpm))

        self.log_info("[DONE ] %s" % msg)
        return result


def _is_src(rpm_info):
    """Check if rpm info object returned by Koji refers to source packages."""
    return rpm_info['arch'] in ('src', 'nosrc')