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# Copyright John N. Laliberte <allanonjl@gentoo.org>
# Copyright Mart Raudsepp <leio@gentoo.org>
# LICENSE - GPL2
# vim: set sts=4 sw=4 et tw=0 :

import requests
try:
    from requests_futures.sessions import FuturesSession
    parallel_requests = True
except:
    print("requests-futures not found for parallel fetching - will fallback to slower one-by-one version retrieval for latest version")
    parallel_requests = False

import package_module, clioptions_module

MAX_WORKERS = 10
DEBUG = False


# TODO: Figure out some better handling of mappings together with package_module
# TODO: package_module has made the reverse mapping of what we need, because we consume the names from release_packages
# TODO: So this reverses it back again for the modules we care for this until a proper fix
name_mapping = {
    "cantarell": "cantarell-fonts",
    "libgfbgraph": "gfbgraph",
    "nm-applet": "network-manager-applet",
    "networkmanager": "NetworkManager",
    "gnome-themes-standard": "gnome-themes-extra",
}

# Turns GNOME versions (40.beta) into the PMS version format (40_beta)
def normalize_version(version: str) -> str:
    if version.endswith(('.rc', '.beta', '.alpha')):
        i = version.rindex('.')
        return f"{version[:i]}_{version[i + 1:]}"
    return version

class GNOME:
    def __init__(self, nextrev=False):
        options = clioptions_module.Options()
        args = options.get_arguments()

        self.nextrev = nextrev;
        self.major_release = ".".join( args.release_number.split(".")[:2] )
        self.full_release = args.release_number

        # gnome_release is the major release number the development is leading up to or is part of. E.g, 2.21.5 will turn to 2.22 and 2.22.2 becomes 2.22
        # This is used in latest versions list fetching URL construction
        gnome_release_list = args.release_number.split(".")
        if int(gnome_release_list[0]) < 40 and int(gnome_release_list[1]) % 2 != 0:
            gnome_release_list[1] = str(int(gnome_release_list[1]) + 1)
        self.gnome_release = ".".join(gnome_release_list[:2])

        if parallel_requests:
            self.http = FuturesSession(max_workers=MAX_WORKERS)
        else:
            self.http = requests.session()
        self.url_base = "https://download.gnome.org/"
        self.release_versions_file_path = self.url_base + 'teams/releng/'

    def generate_data_from_versions_markup(self, url):
        data = self.http.get(url)
        if parallel_requests:
            data = data.result()
        if not data:
            raise ValueError("Couldn't open %s" % url)

        ret = []
        for line in data.text.splitlines():
            components = line.strip().split(':')
            # Skip invalid lines
            if len(components) != 4 or len(components[2]) == 0:
                continue
            pkg = package_module.Package(components[1] + "-" + normalize_version(components[2]), suite=components[0])
            if (pkg.name and pkg.version):
                ret.append(pkg)
            else:
                print("Warning: Ignoring package %s because parsing of its name or version string '%s' failed" % (components[1], components[2]))
        return ret

    def generate_data_individual(self, release_packages):
        ret = []
        # First query all results; if parallel_requests==True, this will run in parallel
        for pkg in release_packages:
            name = pkg.name.split('/')[-1]
            if name in name_mapping:
                name = name_mapping[name]
            pkg.requests_result = self.http.get(self.url_base + '/sources/' + name + '/cache.json')

        # And now handle the results - this is a separate loop for parallel fetch support
        for pkg in release_packages:
            name = pkg.name.split('/')[-1]
            if name in name_mapping:
                name = name_mapping[name]
            # pkg.requests_result is the resulting Response if parallel_requests else Future that we need to call result() on to wait/retrieve the response
            data = pkg.requests_result.result() if parallel_requests else pkg.requests_result
            if not data:
                print("Warning: Unable to read cache.json for %s" % pkg.name)
                continue
            data = data.json()
            if data[0] != 4:
                print("Warning: unknown cache.json version for package %s" % name)
                continue
            major_minor = pkg.major_minor
            new_versioning = False
            if major_minor not in data[3]:
                major_minor = pkg.major
                new_versioning = True
                if major_minor not in data[3]:
                    print("Warning: can't find latest version for %s-%s" % (name, pkg.major_minor))
                    continue
            if not new_versioning and pkg.major != "0" and pkg.minor.isdigit() and int(pkg.minor) % 2 and "%s.%d" % (pkg.major, int(pkg.minor)+1) in data[3]:
                major_minor = "%s.%d" % (pkg.major, int(pkg.minor)+1)
            latest = False
            # Some modules contain more than LATEST-IS-* for some reason, so we need to iterate and find the correct item instead of [0] (even though it is firsy always, but lets be future-proof)
            for tarball in data[3][major_minor]:
                if tarball.startswith('LATEST-IS-'):
                    latest = tarball[10:] # len('LATEST-IS-') == 10
                    break
            if not latest:
                print("Warning: couldn't find latest version from within cache.json[3]")
                continue
            latest_pkg = package_module.Package(name + "-" + normalize_version(latest))
            if pkg.name and pkg.version:
                ret.append(latest_pkg)
            else:
                print("Warning: Ignoring package %s because parsing of its name or version string '%s' failed" % (name, latest))
                continue
        return ret

    def generate_data_release(self):
        return self.generate_data_from_versions_markup(self.release_versions_file_path + self.full_release + '/versions')

import portage_module
def compare_packages(release_packages, latest_packages, packages_in_portage):
    # we care about 5 cases
    # 1.  portage version is less than the release version. (RED)
    # 2.  portage version is equal to the release version, but less than the latest version. (LIGHT GREEN)
    # 3.  portage version is equal to the release version and the latest version. (GREEN)
    # 4.  portage version is greater than the release version (GREEN)
    # 5.  package does not exist in portage (GREY)

    # again, we choose release_packages as the enumerator for the package names
    # since it will have ALL packages ( for example, if we used portage_packages, we
    # might miss the packages that do not exist in portage )
    status_packages = []
    for package in release_packages:
        color = None
        release_package = package
        latest_package = portage_module.findpackage(package.name, latest_packages)
        if latest_package is None:
            print("Warning: latest packages set does not have an entry for %s, using release set version %s." % (package.name, package.version))
            latest_package = package
        portage_package = portage_module.findpackage(package.name, packages_in_portage)

        if portage_package is None:
            status = package_module.Status.NotFound
            # we need to create a phony package since findpackage
            # returns None
            portage_package = package_module.Package(package.name)

        elif portage_module.best_version_test(portage_package.name_plus_version, \
                                     release_package.name_plus_version) == 2:
            status = package_module.Status.NeedUpdate

        elif portage_module.best_version_test(portage_package.name_plus_version, \
                                       latest_package.name_plus_version) == 2:
            status = package_module.Status.NewerVersion

        else:
            status = package_module.Status.Compliant

        #if portage_package is not None:

        # FIXME: Reports release version as latest version to not have to deal with this right now
        if latest_package is None:
            print("No latest version known for %s, FIXME!" % release_package.name)
            latest_package = release_package

        if DEBUG:
            print("package: " + str(release_package.name) +
                 " | pp: " + str(portage_package.version) +
                 " | rp: " + str(release_package.version) +
                 " | lp: " + str(latest_package.version) +
                 " | status: " + str(status))

        status_packages.append(package_module.PackageStatus(release_package.name, str(portage_package.version), str(release_package.version), str(latest_package.version), status, suite=release_package.suite))

    return status_packages