import hashlib
import io
import logging

# Size of the buffer to read files with
BUF_SIZE = 4096

LOG = logging.getLogger("acm.utility")


def get_file_sha256sum(input_file):
    sha256sum = hashlib.sha256()
    with open(input_file, 'rb') as f:
        for byte_block in iter(lambda: f.read(BUF_SIZE), b""):
            sha256sum.update(byte_block)
    return sha256sum.hexdigest()


def get_string_sha256sum(content: str, encoding='utf-8') -> str:
    sha256sum = hashlib.sha256()
    with io.BytesIO(content.encode(encoding)) as c:
        for byte_block in iter(lambda: c.read(BUF_SIZE), b''):
            sha256sum.update(byte_block)
    return sha256sum.hexdigest()


def get_string_hex(content: str) -> hex:
    return hex(int(content, base=16))


def get_hex_xor(first: hex, second: hex) -> hex:
    return hex(int(first, base=16) ^ int(second, base=16))


def get_string_xor(first: str, second: str, *extra: str) -> str:
    result = get_hex_xor(get_string_hex(first), get_string_hex(second))
    for next_hex in extra:
        result = get_hex_xor(result, get_string_hex(next_hex))
    return str(result)