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import argparse
import json
import logging

import borgmatic.config.paths
from borgmatic.borg import environment, feature, flags, repo_info
from borgmatic.execute import DO_NOT_CAPTURE, execute_command

logger = logging.getLogger(__name__)


def make_archive_filter_flags(local_borg_version, config, checks, check_arguments):
    '''
    Given the local Borg version, a configuration dict, a parsed sequence of checks, and check
    arguments as an argparse.Namespace instance, transform the checks into tuple of command-line
    flags for filtering archives in a check command.

    If "check_last" is set in the configuration and "archives" is in checks, then include a "--last"
    flag. And if "prefix" is set in configuration and "archives" is in checks, then include a
    "--match-archives" flag.
    '''
    check_last = config.get('check_last', None)
    prefix = config.get('prefix')

    if 'archives' in checks or 'data' in checks:
        return (('--last', str(check_last)) if check_last else ()) + (
            (
                ('--match-archives', f'sh:{prefix}*')
                if feature.available(feature.Feature.MATCH_ARCHIVES, local_borg_version)
                else ('--glob-archives', f'{prefix}*')
            )
            if prefix
            else (
                flags.make_match_archives_flags(
                    config.get('match_archives'),
                    config.get('archive_name_format'),
                    local_borg_version,
                )
            )
        )

    if check_last:
        logger.warning(
            'Ignoring check_last option, as "archives" or "data" are not in consistency checks'
        )
    if prefix:
        logger.warning(
            'Ignoring consistency prefix option, as "archives" or "data" are not in consistency checks'
        )

    return ()


def make_check_name_flags(checks, archive_filter_flags):
    '''
    Given parsed checks set and a sequence of flags to filter archives, transform the checks into
    tuple of command-line check flags.

    For example, given parsed checks of:

        ('repository',)

    This will be returned as:

        ('--repository-only',)

    However, if both "repository" and "archives" are in checks, then omit the "only" flags from the
    returned flags because Borg does both checks by default. Note that a "data" check only works
    along with an "archives" check.
    '''
    data_flags = ('--verify-data',) if 'data' in checks else ()
    common_flags = (archive_filter_flags if 'archives' in checks else ()) + data_flags

    if {'repository', 'archives'}.issubset(checks):
        return common_flags

    return (
        tuple(f'--{check}-only' for check in checks if check in ('repository', 'archives'))
        + common_flags
    )


def get_repository_id(
    repository_path, config, local_borg_version, global_arguments, local_path, remote_path
):
    '''
    Given a local or remote repository path, a configuration dict, the local Borg version, global
    arguments, and local/remote commands to run, return the corresponding Borg repository ID.

    Raise ValueError if the Borg repository ID cannot be determined.
    '''
    try:
        return json.loads(
            repo_info.display_repository_info(
                repository_path,
                config,
                local_borg_version,
                argparse.Namespace(json=True),
                global_arguments,
                local_path,
                remote_path,
            )
        )['repository']['id']
    except (json.JSONDecodeError, KeyError):
        raise ValueError(f'Cannot determine Borg repository ID for {repository_path}')


def check_archives(
    repository_path,
    config,
    local_borg_version,
    check_arguments,
    global_arguments,
    checks,
    archive_filter_flags,
    local_path='borg',
    remote_path=None,
):
    '''
    Given a local or remote repository path, a configuration dict, the local Borg version, check
    arguments as an argparse.Namespace instance, global arguments, a set of named Borg checks to run
    (some combination "repository", "archives", and/or "data"), archive filter flags, and
    local/remote commands to run, check the contained Borg archives for consistency.
    '''
    lock_wait = config.get('lock_wait')
    extra_borg_options = config.get('extra_borg_options', {}).get('check', '')

    verbosity_flags = ()
    if logger.isEnabledFor(logging.INFO):
        verbosity_flags = ('--info',)
    if logger.isEnabledFor(logging.DEBUG):
        verbosity_flags = ('--debug', '--show-rc')

    try:
        repository_check_config = next(
            check for check in config.get('checks', ()) if check.get('name') == 'repository'
        )
    except StopIteration:
        repository_check_config = {}

    max_duration = check_arguments.max_duration or repository_check_config.get('max_duration')

    umask = config.get('umask')
    borg_exit_codes = config.get('borg_exit_codes')
    working_directory = borgmatic.config.paths.get_working_directory(config)

    if 'data' in checks:
        checks.add('archives')

    grouped_checks = (checks,)

    # If max_duration is set, then archives and repository checks need to be run separately, as Borg
    # doesn't support --max-duration along with an archives checks.
    if max_duration and 'archives' in checks and 'repository' in checks:
        checks.remove('repository')
        grouped_checks = (checks, {'repository'})

    for checks_subset in grouped_checks:
        full_command = (
            (local_path, 'check')
            + (('--repair',) if check_arguments.repair else ())
            + (
                ('--max-duration', str(max_duration))
                if max_duration and 'repository' in checks_subset
                else ()
            )
            + make_check_name_flags(checks_subset, archive_filter_flags)
            + (('--remote-path', remote_path) if remote_path else ())
            + (('--umask', str(umask)) if umask else ())
            + (('--log-json',) if config.get('log_json') else ())
            + (('--lock-wait', str(lock_wait)) if lock_wait else ())
            + verbosity_flags
            + (('--progress',) if config.get('progress') else ())
            + (tuple(extra_borg_options.split(' ')) if extra_borg_options else ())
            + flags.make_repository_flags(repository_path, local_borg_version)
        )

        execute_command(
            full_command,
            # The Borg repair option triggers an interactive prompt, which won't work when output is
            # captured. And progress messes with the terminal directly.
            output_file=(
                DO_NOT_CAPTURE if check_arguments.repair or config.get('progress') else None
            ),
            environment=environment.make_environment(config),
            working_directory=working_directory,
            borg_local_path=local_path,
            borg_exit_codes=borg_exit_codes,
        )