"""
Create a cache of the given rules.
This is only really intended to be used by CI to pre-cache rulesets
that will be distributed within PyInstaller binaries.

Usage:

   $ python scripts/cache-ruleset.py rules/ /path/to/cache/directory

Copyright (C) 2023 Mandiant, Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
You may obtain a copy of the License at: [package root]/LICENSE.txt
Unless required by applicable law or agreed to in writing, software distributed under the License
 is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and limitations under the License.
"""

import sys
import logging
import argparse
from pathlib import Path

import capa.main
import capa.rules
import capa.engine
import capa.helpers
import capa.rules.cache
import capa.features.insn

logger = logging.getLogger("cache-ruleset")


def main(argv=None):
    if argv is None:
        argv = sys.argv[1:]

    parser = argparse.ArgumentParser(description="Cache ruleset.")
    capa.main.install_common_args(parser)
    parser.add_argument("rules", type=str, help="Path to rules directory")
    parser.add_argument("cache", type=str, help="Path to cache directory")
    args = parser.parse_args(args=argv)

    # don't use capa.main.handle_common_args
    # because it expects a different format for the --rules argument

    if args.quiet:
        logging.basicConfig(level=logging.WARNING)
        logging.getLogger().setLevel(logging.WARNING)
    elif args.debug:
        logging.basicConfig(level=logging.DEBUG)
        logging.getLogger().setLevel(logging.DEBUG)
    else:
        logging.basicConfig(level=logging.INFO)
        logging.getLogger().setLevel(logging.INFO)

    try:
        cache_dir = Path(args.cache)
        cache_dir.mkdir(parents=True, exist_ok=True)
        rules = capa.rules.get_rules([Path(args.rules)], cache_dir)
        logger.info("successfully loaded %s rules", len(rules))
    except (IOError, capa.rules.InvalidRule, capa.rules.InvalidRuleSet) as e:
        logger.error("%s", str(e))
        return -1

    content = capa.rules.cache.get_ruleset_content(rules)
    id = capa.rules.cache.compute_cache_identifier(content)
    path = capa.rules.cache.get_cache_path(cache_dir, id)

    assert path.exists()
    logger.info("cached to: %s", path)


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