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

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
import glob
import os
import re
from future.moves import configparser as ConfigParser
from future.moves.configparser import SafeConfigParser

from clselect.utils import check_output
from clselect.utils import file_writelines, file_readlines


EXTENSION_PATTERN = re.compile('^(?P<name>.+) \((?P<version>.+)\)$',
                               re.MULTILINE)

CACHE = '/var/lve/rubygems'
CACHE_BINARY = '/usr/share/l.v.e-manager/utils/cache_rubygems.py'


class ExtensionInfo(object):

    url = 'http://rubygems.org/gems'

    def __init__(self, gem=None):
        if gem:
            self.gem = gem
        else:
            self.gem = sorted(glob.glob('/opt/alt/ruby??/bin/gem'))[-1]

    def _list_gems(self):
        output = check_output(self.gem, 'list', '--remote')
        return EXTENSION_PATTERN.findall(output)

    def _list_gem_version(self, gem):
        output = check_output(self.gem, 'list', '^' + gem + '$', '--remote', '--all')
        versions = [version.split(',') for extension, version in EXTENSION_PATTERN.findall(output)]
        return sorted(list(set(version.strip().split(" ")[0] for version in versions[0])))

    def list_extensions(self):
        extensions = [extension for extension, _ in self._list_gems()]
        return ExtensionInfo.extensions_docs(extensions)

    def list_extensions_cached(self):
        if not os.path.isfile(CACHE):
            extensions = self.write_cache()
        else:
            extensions = [i.strip() for i in file_readlines(CACHE)]
        return ExtensionInfo.extensions_docs(extensions)

    def write_cache(self):
        extensions = [extension for extension, _ in self._list_gems()]
        try:
            file_writelines(CACHE, ['%s\n' % extension for extension in extensions], 'w')
            os.chmod(CACHE, 0o644)
        except IOError:
            pass
        return extensions

    def list_extensions_version(self, extensions):
        return dict((extension, {'versions': self._list_gem_version(extension)})
                    for extension in extensions)

    @staticmethod
    def delete_cache():
        try:
            os.unlink(CACHE)
        except OSError:
            pass

    @staticmethod
    def extension_doc(extension):
        return str.join('/', (ExtensionInfo.url, extension))

    @staticmethod
    def extensions_docs(extensions):
        docs = (ExtensionInfo.extension_doc(extension)
                for extension in extensions)
        return dict((extension, {'doc': doc})
                    for extension, doc in zip(extensions, docs))

    @staticmethod
    def get_locked_extensions(interpreter):
        alt_ver = interpreter.replace('.','')
        file_path = os.path.join('/opt/alt', alt_ver ,'etc', 'locked_extensions.ini')
        if not os.path.exists(file_path):
            file_path = os.path.join(os.path.dirname(__file__), '..', 'locked_extensions.ini')
        parser = SafeConfigParser(interpolation=None, strict=False)
        parser.read(file_path)
        try:
            items = parser.items(interpreter)
        except ConfigParser.NoSectionError:
            items = ()

        return dict((extension, [v.strip() for v in versions.split(',') if v])
                    for extension, versions in items)

    @staticmethod
    def is_extensions_locked(locked_extensions, extension, version):
        return (extension in locked_extensions and (
            list(set([v.strip() for v in version.split(',') if len(version) > 0])
                & set(locked_extensions.get(extension))) or
            len(locked_extensions.get(extension)) == 0
        ))