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from argparse import ArgumentParser
import configparser
import importlib
import logging
import os.path
import sys

from pull.cgit import CGit, Output
from pull.repo import BitbucketRepo, GithubRepo, Repo


DEFAULT_OUTPUT_DIR = '/var/tmp/cgit-repos/output'
DEFAULT_CONFIG_PATH = '/etc/cgit-repos/cgit-repos.conf'
DEFAULT_MY_REPOS_PATH = '/etc/cgit-repos/my_repos.py'


def set_up_logging():
    logging.basicConfig(
        level=logging.DEBUG,
        datefmt='%Y-%m-%d %H:%M:%S',
        format='%(asctime)s | %(levelname)s | %(message)s')


def parse_args(argv=None):
    if argv is None:
        argv = sys.argv[1:]
    parser = ArgumentParser()
    parser.add_argument('--config', metavar='PATH',
                        default=DEFAULT_CONFIG_PATH,
                        help='config file path')
    parser.add_argument('--repo', metavar='REPO_ID',
                        nargs='*', dest='repos',
                        help='repos to pull')
    return parser.parse_args(argv)


class Config:
    @staticmethod
    def read(path):
        config = configparser.ConfigParser()
        config.read(path)
        return Config(config)

    def __init__(self, impl):
        self.impl = impl

    @property
    def output(self):
        return self.impl.get('DEFAULT', 'output', fallback=DEFAULT_OUTPUT_DIR)

    @property
    def clone_url(self):
        return self.impl.get('DEFAULT', 'clone_url', fallback=None)

    @property
    def default_owner(self):
        return self.impl.get('DEFAULT', 'owner', fallback=None)

    @property
    def github_username(self):
        return self.impl.get('GITHUB', 'username', fallback=None)

    @property
    def bitbucket_username(self):
        return self.impl.get('BITBUCKET', 'username', fallback=None)

    def set_defaults(self):
        Repo.DEFAULT_OWNER = self.default_owner
        GithubRepo.DEFAULT_USER = self.github_username
        BitbucketRepo.DEFAULT_USER = self.bitbucket_username

    @property
    def my_repos(self):
        return self.impl.get('DEFAULT', 'my_repos', fallback=DEFAULT_MY_REPOS_PATH)

    def import_my_repos(self):
        sys.path.append(os.path.dirname(self.my_repos))
        module_name = os.path.splitext(os.path.basename(self.my_repos))[0]
        module = importlib.import_module(module_name)
        return module.MY_REPOS


def main(args=None):
    set_up_logging()
    try:
        args = parse_args(args)
        config = Config.read(args.config)
        config.set_defaults()
        my_repos = config.import_my_repos()
        cgit = CGit(config.clone_url)
        output = Output(config.output, cgit)
        success = True
        for repo in my_repos:
            if args.repos is None or repo.repo_id in args.repos:
                if not output.pull(repo):
                    success = False
        if success:
            logging.info('All repositories were updated successfully')
            return 0
        else:
            logging.warning("Some repositories couldn't be updated!")
            return 1
    except Exception as e:
        logging.exception(e)
        raise


if __name__ == '__main__':
    sys.exit(main())