# -*- 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/>.


import os
from six.moves import cPickle as pickle
import json
import re
from kobo.shortcuts import force_list

import pungi.wrappers.kojiwrapper
from pungi.wrappers.comps import CompsWrapper
import pungi.phases.pkgset.pkgsets
from pungi.arch import get_valid_arches
from pungi.util import is_arch_multilib, retry

from pungi.phases.pkgset.common import create_arch_repos, create_global_repo, populate_arch_pkgsets
from pungi.phases.gather import get_packages_to_gather


import pungi.phases.pkgset.source

try:
    from pdc_client import PDCClient
    import modulemd
    WITH_MODULES = True
except:
    WITH_MODULES = False


def get_pdc_client_session(compose):
    if not WITH_MODULES:
        compose.log_warning("pdc_client or modulemd  module is not installed, "
                            "support for modules is disabled")
        return None
    try:
        return PDCClient(
            server=compose.conf['pdc_url'],
            develop=compose.conf['pdc_develop'],
            ssl_verify=not compose.conf['pdc_insecure'],
        )
    except KeyError:
        return None


def variant_dict_from_str(compose, module_str):
    """
    Method which parses module NVR string, defined in a variants file and returns
    a module info dictionary instead.

    For more information about format of module_str, read:
    https://pagure.io/modularity/blob/master/f/source/development/
    building-modules/naming-policy.rst

    Pungi supports only N:S and N:S:V, because other combinations do not
    have sense for variant files.

    Attributes:
        compose: compose for which the variant_dict is generated
        module_str: string, the NV(R) of module defined in a variants file.
    """

    # The new format can be distinguished by colon in module_str, because
    # there is not module in Fedora with colon in a name or stream and it is
    # now disallowed to create one. So if colon is there, it must be new
    # naming policy format.
    if module_str.find(":") != -1:
        module_info = {}
        module_info['variant_type'] = 'module'

        nsv = module_str.split(":")
        if len(nsv) > 3:
            raise ValueError(
                "Module string \"%s\" is not allowed. "
                "Only NAME:STREAM or NAME:STREAM:VERSION is allowed.")
        if len(nsv) > 2:
            module_info["variant_release"] = nsv[2]
        if len(nsv) > 1:
            module_info["variant_version"] = nsv[1]
        module_info["variant_id"] = nsv[0]
        return module_info
    else:
        # Fallback to previous old format with '-' delimiter.
        compose.log_warning(
            "Variant file uses old format of module definition with '-'"
            "delimiter, please switch to official format defined by "
            "Modules Naming Policy.")

        module_info = {}
        # The regex is matching a string which should represent the release number
        # of a module. The release number is in format: "%Y%m%d%H%M%S"
        release_regex = re.compile("^(\d){14}$")

        section_start = module_str.rfind('-')
        module_str_first_part = module_str[section_start+1:]
        if release_regex.match(module_str_first_part):
            module_info['variant_release'] = module_str_first_part
            module_str = module_str[:section_start]
            section_start = module_str.rfind('-')
            module_info['variant_version'] = module_str[section_start+1:]
        else:
            module_info['variant_version'] = module_str_first_part
        module_info['variant_id'] = module_str[:section_start]
        module_info['variant_type'] = 'module'

        return module_info


@retry(wait_on=IOError)
def get_module(compose, session, module_info):
    """
    :param session : PDCClient instance
    :param module_info: pdc variant_dict, str, mmd or module dict

    :return final list of module_info which pass repoclosure
    """

    module_info = variant_dict_from_str(compose, module_info)

    query = dict(
        variant_id=module_info['variant_id'],
        variant_version=module_info['variant_version'],
        active=True,
    )
    if module_info.get('variant_release'):
        query['variant_release'] = module_info['variant_release']

    retval = session['unreleasedvariants'](page_size=-1, **query)

    # Error reporting
    if not retval:
        raise ValueError("Failed to find module in PDC %r" % query)

    module = None
    # If we specify 'variant_release', we expect only single module to be
    # returned, but otherwise we have to pick the one with the highest
    # release ourselves.
    if 'variant_release' in query:
        assert len(retval) <= 1, "More than one module returned from PDC: %s" % retval
        module = retval[0]
    else:
        module = retval[0]
        for m in retval:
            if int(m['variant_release']) > int(module['variant_release']):
                module = m

    return module


class PkgsetSourceKoji(pungi.phases.pkgset.source.PkgsetSourceBase):
    enabled = True

    def __call__(self):
        compose = self.compose
        koji_profile = compose.conf["koji_profile"]
        self.koji_wrapper = pungi.wrappers.kojiwrapper.KojiWrapper(koji_profile)
        # path prefix must contain trailing '/'
        path_prefix = self.koji_wrapper.koji_module.config.topdir.rstrip("/") + "/"
        package_sets = get_pkgset_from_koji(self.compose, self.koji_wrapper, path_prefix)
        return (package_sets, path_prefix)


def get_pkgset_from_koji(compose, koji_wrapper, path_prefix):
    event_info = get_koji_event_info(compose, koji_wrapper)
    pkgset_global = populate_global_pkgset(compose, koji_wrapper, path_prefix, event_info)
    package_sets = populate_arch_pkgsets(compose, path_prefix, pkgset_global)
    package_sets["global"] = pkgset_global

    create_global_repo(compose, path_prefix)
    for arch in compose.get_arches():
        # TODO: threads? runroot?
        create_arch_repos(compose, arch, path_prefix)

    return package_sets


def populate_global_pkgset(compose, koji_wrapper, path_prefix, event_id):
    all_arches = set(["src"])
    for arch in compose.get_arches():
        is_multilib = is_arch_multilib(compose.conf, arch)
        arches = get_valid_arches(arch, is_multilib)
        all_arches.update(arches)

    # List of compose tags from which we create this compose
    compose_tags = []

    # List of compose_tags per variant
    variant_tags = {}

    # In case we use "nodeps" gather_method, we might now the final list of
    # packages which will end up in the compose even now, so instead of reading
    # all the packages from Koji tag, we can just cherry-pick the ones which
    # are really needed to do the compose and safe lot of time and resources
    # here. This only works if we are not creating bootable images. Those could
    # include packages that are not in the compose.
    packages_to_gather = []
    if compose.conf["gather_method"] == "nodeps" and not compose.conf.get('bootable'):
        packages_to_gather, groups = get_packages_to_gather(
            compose, include_arch=False, include_prepopulated=True)
        if groups:
            comps = CompsWrapper(compose.paths.work.comps())
            for group in groups:
                packages_to_gather += comps.get_packages(group)

    # In case we use "deps" gather_method, there might be some packages in
    # the Koji tag which are not signed with proper sigkey. However, these
    # packages might never end up in a compose depending on which packages
    # from the Koji tag are requested how the deps are resolved in the end.
    # In this case, we allow even packages with invalid sigkeys to be returned
    # by PKGSET phase and later, the gather phase checks its results and if
    # there are some packages with invalid sigkeys, it raises an exception.
    if compose.conf["gather_method"] == "deps":
        allow_invalid_sigkeys = True
    else:
        allow_invalid_sigkeys = False

    session = get_pdc_client_session(compose)
    for variant in compose.all_variants.values():
        variant.pkgset = pungi.phases.pkgset.pkgsets.KojiPackageSet(
            koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
            arches=all_arches, allow_invalid_sigkeys=allow_invalid_sigkeys)
        variant_tags[variant] = []
        pdc_module_file = os.path.join(compose.paths.work.topdir(arch="global"),
                                       "pdc-module-%s.json" % variant.uid)
        pdc_modules = []
        # Find out all modules in every variant and add their compose tags
        # to compose_tags list.
        if session:
            for module in variant.get_modules():
                pdc_module = get_module(compose, session, module["name"])
                pdc_modules.append(pdc_module)
                mmd = modulemd.ModuleMetadata()
                mmd.loads(pdc_module["modulemd"])

                # Catch the issue when PDC does not contain RPMs, but
                # the module definition says there should be some.
                if not pdc_module["rpms"] and mmd.components.rpms:
                    raise ValueError(
                        "Module %s does not have any rpms in 'rpms' PDC field,"
                        "but according to modulemd, there should be some."
                        % pdc_module["variant_uid"])

                # Add RPMs from PDC response to modulemd, so we can track
                # what RPM is in which module later in gather phase.
                for rpm_nevra in pdc_module["rpms"]:
                    if rpm_nevra.endswith(".rpm"):
                        rpm_nevra = rpm_nevra[:-len(".rpm")]
                    mmd.artifacts.add_rpm(str(rpm_nevra))

                tag = pdc_module["koji_tag"]
                variant.mmds.append(mmd)
                variant_tags[variant].append(tag)
                if tag not in compose_tags:
                    compose_tags.append(tag)

                module_msg = "Module {module} in variant {variant} will use Koji tag {tag}.".format(
                    variant=variant, tag=tag, module=module["name"])
                compose.log_info("%s" % module_msg)

        if pdc_modules:
            with open(pdc_module_file, 'w') as f:
                json.dump(pdc_modules, f)
        if not variant_tags[variant]:
            variant_tags[variant].extend(force_list(compose.conf["pkgset_koji_tag"]))

    # Add global tag if supplied.
    if 'pkgset_koji_tag' in compose.conf:
        if compose.conf["pkgset_koji_tag"] == "not-used":
            # The magic value is used for modular composes to avoid errors
            # about missing option. It should be removed in next version.
            compose.log_warning('pkgset_koji_tag is set to "not-used", but the '
                                'option is no longer required. Remove it from '
                                'the configuration.')
        else:
            compose_tags.extend(force_list(compose.conf["pkgset_koji_tag"]))

    inherit = compose.conf["pkgset_koji_inherit"]
    global_pkgset_path = os.path.join(
        compose.paths.work.topdir(arch="global"), "pkgset_global.pickle")
    if compose.DEBUG and os.path.isfile(global_pkgset_path):
        msg = "Populating the global package set from tag '%s'" % compose_tags
        compose.log_warning("[SKIP ] %s" % msg)
        with open(global_pkgset_path, "rb") as f:
            global_pkgset = pickle.load(f)
    else:
        global_pkgset = pungi.phases.pkgset.pkgsets.KojiPackageSet(
            koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
            arches=all_arches, allow_invalid_sigkeys=allow_invalid_sigkeys)
        # Get package set for each compose tag and merge it to global package
        # list. Also prepare per-variant pkgset, because we do not have list
        # of binary RPMs in module definition - there is just list of SRPMs.
        for compose_tag in compose_tags:
            compose.log_info("Populating the global package set from tag "
                             "'%s'" % compose_tag)
            pkgset = pungi.phases.pkgset.pkgsets.KojiPackageSet(
                koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
                arches=all_arches, packages=packages_to_gather,
                allow_invalid_sigkeys=allow_invalid_sigkeys)
            # Create a filename for log with package-to-tag mapping. The tag
            # name is included in filename, so any slashes in it are replaced
            # with underscores just to be safe.
            logfile = compose.paths.log.log_file(
                None, 'packages_from_%s' % compose_tag.replace('/', '_'))
            pkgset.populate(compose_tag, event_id, inherit=inherit, logfile=logfile)
            for variant in compose.all_variants.values():
                if compose_tag in variant_tags[variant]:
                    # Optimization for case where we have just single compose
                    # tag - we do not have to merge in this case...
                    if len(compose_tags) == 1:
                        variant.pkgset = pkgset
                    else:
                        variant.pkgset.merge(pkgset, None, list(all_arches))
            # Optimization for case where we have just single compose
            # tag - we do not have to merge in this case...
            if len(compose_tags) == 1:
                global_pkgset = pkgset
            else:
                global_pkgset.merge(pkgset, None, list(all_arches),
                                    unique_name=compose_tag in compose.conf['pkgset_koji_tag'])
        with open(global_pkgset_path, 'wb') as f:
            data = pickle.dumps(global_pkgset)
            f.write(data)

    # write global package list
    global_pkgset.save_file_list(
        compose.paths.work.package_list(arch="global"),
        remove_path_prefix=path_prefix)
    return global_pkgset


def get_koji_event_info(compose, koji_wrapper):
    koji_proxy = koji_wrapper.koji_proxy
    event_file = os.path.join(compose.paths.work.topdir(arch="global"), "koji-event")

    if compose.koji_event:
        koji_event = koji_proxy.getEvent(compose.koji_event)
        compose.log_info("Setting koji event to a custom value: %s" % compose.koji_event)
        json.dump(koji_event, open(event_file, "w"))
        return koji_event

    msg = "Getting koji event"
    if compose.DEBUG and os.path.exists(event_file):
        compose.log_warning("[SKIP ] %s" % msg)
        result = json.load(open(event_file, "r"))
    else:
        compose.log_info(msg)
        result = koji_proxy.getLastEvent()
        json.dump(result, open(event_file, "w"))
    compose.log_info("Koji event: %s" % result["id"])
    return result