import configparser
import logging
import os
import sys
from rich.logging import RichHandler


# Exit codes
# 1: Config file invalid, it has no sections
# 2: Config file invalid, sections must define at least CONST.CFG_MANDATORY


class CONST(object):
    __slots__ = ()
    LOG_FORMAT = "%(message)s"
    CFG_DEFAULT_FILENAME = "config.ini"
    CFG_DEFAULT_ABS_PATH = os.path.join(os.getcwd(), CFG_DEFAULT_FILENAME)
    CFG_MANDATORY = "query"


CONST = CONST()
logging.basicConfig(
    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")
log.setLevel(logging.DEBUG)


config = configparser.ConfigParser()
config.read(CONST.CFG_DEFAULT_FILENAME)


def validate_config_defaults(config_obj: configparser.ConfigParser()) -> None:
    log.debug(f"Loading config from file '{CONST.CFG_DEFAULT_ABS_PATH}' ...")
    if not config_obj.sections():
        log.error(f"No config sections found in '{CONST.CFG_DEFAULT_ABS_PATH}'. Exiting 1 ...")
        sys.exit(1)
    if config.defaults():
        for default in config_obj.defaults():
            log.debug(f"    {default} = {config_obj[config_obj.default_section][default]}")
    else:
        log.debug(f"No defaults defined")


def config_has_valid_section(config_obj: configparser.ConfigParser()) -> bool:
    has_valid_section = False
    for config_obj_section in config_obj.sections():
        if CONST.CFG_MANDATORY in config_obj.options(config_obj_section):
            has_valid_section = True
            break
    return has_valid_section


#def option_has_default_value(config_option: configparser.ConfigParser(), section: str) -> bool:
#
#~ local option that doesn't exist in defaults section
#+ local option that overrides a default
#* global option

def validate_config_sections(config_obj: configparser.ConfigParser()) -> None:
    for section in config_obj.sections():
        log.debug(f"Loading config '[{section}]' ...")
        for key in config_obj[section]:
            # log.debug(config_obj.has_option(section, key))
            is_local_option = True if config_obj.has_option(section, key) else False
            log.debug(f"""    {key}{"/" if is_local_option else ".."} = {config_obj[section][key]}""")


validate_config_defaults(config)
if config_has_valid_section(config):
    validate_config_sections(config)
else:
    log.error(f"No valid config section found. A valid config section has at least the '{CONST.CFG_MANDATORY}' "
              f"option set. Exiting 2 ...")
    sys.exit(2)


# https://stackoverflow.com/a/2451872
quit()

# This is a sample Python script.

# Press Umschalt+F10 to execute it or replace it with your code.
# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.


def print_hi(name):
    # Use a breakpoint in the code line below to debug your script.
    print(f'Hi, {name}')  # Press Strg+F8 to toggle the breakpoint.


# Press the green button in the gutter to run the script.
if __name__ == '__main__':
    print_hi('PyCharm')

# See PyCharm help at https://www.jetbrains.com/help/pycharm/