import argparse
import json
import logging
import os


def argparse_file_exists(file_path):
    """Validates whether a file exists."""
    if not os.path.isfile(file_path):
        raise argparse.ArgumentTypeError("File does not exist")

    return os.path.abspath(file_path)


def argparse_file_json(file_path):
    """Validates whether a file contains JSON parsable by Python. Raises argparse.ArgumentTypeError if not."""
    if not os.path.isfile(file_path):
        raise argparse.ArgumentTypeError("Provided configuration file does not exist")

    try:
        with open(file_path, "r") as file:
            data = json.load(file)
    except json.decoder.JSONDecodeError:
        raise argparse.ArgumentTypeError("Provided configuration file content is not json")
    except Exception as e:
        raise argparse.ArgumentTypeError("Cannot parse provided configuration file:\n" + str(e))

    return data


def argparse_logging_level(level):
    """Validates that a string value is a valid logging level and returns the corresponding value."""
    if hasattr(logging, level.upper()):
        return level.upper()
    raise argparse.ArgumentTypeError("Invalid logging level: " + str(level))