# The MIT License (MIT)
#
# Copyright (c) 2016 Adam Schubert
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from __future__ import annotations

# /// script
# requires-python = ">=3.11"
# dependencies = [
#     "cron-descriptor",
# ]
# ///
import re
from pathlib import Path

try:
    from cron_descriptor import ExpressionDescriptor, Options
except ImportError:
    print("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
    print('\033[1mFailed to import cron_descriptor, maybe ? "pip install cron-descriptor ?"\033[0m')
    print("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
    raise


class CrontabReader:
    """Simple example reading /etc/contab"""

    rex = re.compile(r"^(\S{1,3}\s+\S{1,3}\s+\S{1,3}\s+\S{1,3}\s+\S{1,3}).+$")

    def __init__(self, cronfile: Path) -> None:
        """Initialize CrontabReader

        Args:
            cronfile: Path to cronfile
        Returns:
            None
        """
        options = Options()
        options.day_of_week_start_index_zero = False
        options.use_24hour_time_format = True
        with cronfile.open("r", encoding="utf-8") as f:
            for line in f.readlines():
                if parsed_line := self.parse_cron_line(line):
                    print(f"{parsed_line} -> {ExpressionDescriptor(parsed_line, options)}")

    def parse_cron_line(self, line: str) -> str | None:
        """Parses crontab line and returns only starting time string

        Args:
            line: crontab line
        Returns:
            Time part of cron line or None
        """
        if (stripped := line.strip()) and not stripped.startswith("#"):
            rexres = self.rex.search(stripped)
            if rexres:
                return " ".join(rexres.group(1).split())

        return None


if __name__ == "__main__":
    CrontabReader(Path("/etc/crontab"))
