import os
import logging
from rich.logging import RichHandler
from rich.traceback import install
import configparser


class CONST(object):
    __slots__ = ()
    LOG_FORMAT = "%(message)s"
    CFG_THIS_FILE_DIRNAME = os.path.dirname(__file__)
    CFG_DEFAULT_FILENAME = "config.ini"
    CFG_DEFAULT_ABS_PATH = os.path.join(CFG_THIS_FILE_DIRNAME, CFG_DEFAULT_FILENAME)
    CFG_KNOWN_DEFAULTS = [
        {"key": "self_name", "value": "kodi-nfo-feeder"},
        {"key": "watch_dir", "value": os.path.join(CFG_THIS_FILE_DIRNAME, "data/var/lib/%(self_name)s/watch")},
        {"key": "output_dir", "value": os.path.join(CFG_THIS_FILE_DIRNAME, "data/var/lib/%(self_name)s/output")}
    ]
    CFG_KNOWN_SECTION = [
        {"key": "watch_dir", "is_mandatory": True},
        {"key": "output_dir", "is_mandatory": True}
    ]
    CFG_MANDATORY = [section_cfg["key"] for section_cfg in CFG_KNOWN_SECTION if section_cfg["is_mandatory"]]


CONST = CONST()
logging.basicConfig(
    # Default for all modules in NOTSET so log everything
    level="NOTSET",
    format=CONST.LOG_FORMAT,
    datefmt="[%X]",
    handlers=[RichHandler(
        show_time=False if "SYSTEMD_EXEC_PID" in os.environ else True,
        rich_tracebacks=True
    )]
)
log = logging.getLogger("rich")
# Our own code logs with this level
log.setLevel(logging.DEBUG)
install(show_locals=True)


class ConfigParser(
        configparser.ConfigParser):
    """Can get options() without defaults

    Taken from https://stackoverflow.com/a/12600066.
    """

    def options(self, section, no_defaults=False, **kwargs):
        if no_defaults:
            try:
                return list(self._sections[section].keys())
            except KeyError:
                raise configparser.NoSectionError(section)
        else:
            return super().options(section)


ini_defaults = []
internal_defaults = {default["key"]: default["value"] for default in CONST.CFG_KNOWN_DEFAULTS}
config = ConfigParser(defaults=internal_defaults)
config.read(CONST.CFG_DEFAULT_FILENAME)