import hashlib

try:
    # this will work with micropython and python < 3.10
    # but will raise and exception if ripemd is not supported (python3.10, openssl 3)
    hashlib.new("ripemd160")

    def ripemd160(msg: bytes) -> bytes:
        return hashlib.new("ripemd160", msg).digest()

except:
    # otherwise use pure python implementation
    from .util.py_ripemd160 import ripemd160


def double_sha256(msg: bytes) -> bytes:
    """sha256(sha256(msg)) -> bytes"""
    return hashlib.sha256(hashlib.sha256(msg).digest()).digest()


def hash160(msg: bytes) -> bytes:
    """ripemd160(sha256(msg)) -> bytes"""
    return ripemd160(hashlib.sha256(msg).digest())


def sha256(msg: bytes) -> bytes:
    """one-line sha256(msg) -> bytes"""
    return hashlib.sha256(msg).digest()


def tagged_hash(tag: str, data: bytes) -> bytes:
    """BIP-Schnorr tag-specific key derivation"""
    hashtag = hashlib.sha256(tag.encode()).digest()
    return hashlib.sha256(hashtag + hashtag + data).digest()


def tagged_hash_init(tag: str, data: bytes = b""):
    """Prepares a tagged hash function to digest extra data"""
    hashtag = hashlib.sha256(tag.encode()).digest()
    h = hashlib.sha256(hashtag + hashtag + data)
    return h