# Copyright 2014 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Script for administering the Continuous Integration Database."""

import logging
import os

from chromite.lib import cidb
from chromite.lib import commandline
from chromite.lib import cros_build_lib
from chromite.lib import git


MIGRATE = "migrate"
WIPE = "wipe"

COMMANDS = [MIGRATE, WIPE]


def GetParser():
    """Creates the argparse parser."""
    parser = commandline.ArgumentParser(description=__doc__)

    # Put options that control the mode of script into mutually exclusive group.

    parser.add_argument(
        "command",
        action="store",
        choices=COMMANDS,
        help="The action to execute.",
    )
    parser.add_argument(
        "cred_dir",
        action="store",
        metavar="CIDB_CREDENTIALS_DIR",
        help="Database credentials directory with certificates "
        "and other connection information.",
    )
    parser.add_argument(
        "--migrate-version",
        action="store",
        default=None,
        help="Maximum schema version to migrate to.",
    )

    return parser


def main(argv):
    parser = GetParser()
    options = parser.parse_args(argv)

    logging.getLogger("sqlalchemy.engine").setLevel(logging.INFO)

    # Check that we have no uncommitted files, and that our checkout's HEAD is
    # contained in a remote branch. This is to ensure that we don't accidentally
    # run uncommitted migrations.
    uncommitted_files = git.RunGit(os.getcwd(), ["status", "-s"]).stdout
    if uncommitted_files:
        cros_build_lib.Die("You appear to have uncommitted files. Aborting!")

    remote_branches = git.RunGit(
        os.getcwd(), ["branch", "-r", "--contains"]
    ).stdout
    if not remote_branches:
        cros_build_lib.Die(
            "You appear to be on a local branch of chromite. Aborting!"
        )

    if options.command == MIGRATE:
        positive_confirmation = "please modify my database"
        warn = (
            "This option will apply schema changes to your existing database. "
            "You should not run this against the production database unless "
            "your changes are thoroughly tested, and those tests included "
            "in cidb_integration_test.py (including tests that old data is "
            "sanely migrated forward). Database corruption could otherwise "
            'result. Are you sure you want to proceed? If so, type "%s" '
            "now.\n"
        ) % positive_confirmation
    elif options.command == WIPE:
        positive_confirmation = "please delete my data"
        warn = (
            "This operation will wipe (i.e. DELETE!) the entire contents of "
            "the database pointed at by %s. Are you sure you want to proceed? "
            'If so, type "%s" now.\n'
        ) % (os.path.join(options.cred_dir, "host.txt"), positive_confirmation)
    else:
        cros_build_lib.Die("No command or unsupported command. Exiting.")

    print(warn)
    conf_string = input("(%s)?: " % positive_confirmation)
    if conf_string != positive_confirmation:
        cros_build_lib.Die("You changed your mind. Aborting.")

    if options.command == MIGRATE:
        print("OK, applying migrations...")
        db = cidb.CIDBConnection(options.cred_dir)
        db.ApplySchemaMigrations(maxVersion=options.migrate_version)
    elif options.command == WIPE:
        print("OK, wiping database...")
        db = cidb.CIDBConnection(options.cred_dir)
        db.DropDatabase()
        print("Done.")