# Copyright 2016 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""cros cidbcreds: get the cidb credentials from gs."""

import logging
import os
import shutil

from chromite.cli import command
from chromite.lib import gs
from chromite.lib import locking
from chromite.lib import path_util


PROD_REPLICA_CIDB_READONLY_BUCKET = (
    "gs://chromeos-cidb-creds/prod_replica_cidb_gen2_readonly/"
)


def GetCIDBCreds(cidb_dir):
    """Download CIDB creds from google storage to local cidb diretory."""
    ctx = gs.GSContext(init_boto=True)
    ctx.Copy(PROD_REPLICA_CIDB_READONLY_BUCKET + "*", cidb_dir)


def CheckAndGetCIDBCreds(force_update=False, folder=None):
    """Check if CIDB creds exist, download creds if necessary."""
    cache_dir = path_util.GetCacheDir()
    dir_name = folder if folder is not None else "cidb_creds"
    cidb_dir = os.path.join(cache_dir, dir_name)
    cidb_dir_lock = cidb_dir + ".lock"

    with locking.FileLock(cidb_dir_lock).write_lock():
        if os.path.exists(cidb_dir):
            if force_update:
                shutil.rmtree(cidb_dir, ignore_errors=True)
                logging.debug(
                    "Force updating CIDB creds. Deleted %s.", cidb_dir
                )
            else:
                logging.debug("Using cached credentials %s", cidb_dir)
                return cidb_dir

        os.mkdir(cidb_dir)

        try:
            GetCIDBCreds(cidb_dir)
            return cidb_dir
        except Exception as e:
            if isinstance(e, gs.GSCommandError):
                logging.warning(
                    "Please check if the GS credentials is configured "
                    "correctly. Please note the permissions to fetch "
                    "these credentials are for Googlers only,"
                )

            logging.error(
                "Failed to get CIDB credentials. Deleting %s", cidb_dir
            )
            shutil.rmtree(cidb_dir, ignore_errors=True)
            raise


@command.command_decorator("cidbcreds")
class CidbCredsCommand(command.CliCommand):
    """cros cidbcreds: download the prod_replica_cidb_readonly credentials."""

    @classmethod
    def AddParser(cls, parser):
        super(cls, CidbCredsCommand).AddParser(parser)
        parser.add_argument(
            "--folder",
            action="store",
            help="The folder name to store the credentials.",
        )
        parser.add_argument(
            "--force-update",
            action="store_true",
            help="force updating the credentials.",
        )
        return parser

    def Run(self):
        """Run cros cidbcreds."""
        cidb_dir = CheckAndGetCIDBCreds(
            force_update=self.options.force_update, folder=self.options.folder
        )
        logging.notice("CIDB credentials at: %s", cidb_dir)