import base58
import ecdsa
import hashlib
from struct import pack, unpack
from Crypto.Hash import RIPEMD160


COMPRESSED_PUBLIC_KEY_LENGTH = 33
NEO_ADDRESS_VERSION = 0x35
UNCOMPRESSED_PUBLIC_KEY_LENGTH = 65
DECODE_ADDRESS_LENGTH = 21
PS_IN_HASH160 = 0x0C
CHECK_SIG_DESCRIPTOR = int.from_bytes(
        hashlib.sha256("System.Crypto.CheckSig".encode('ascii')).digest()[:4], byteorder='little'
    )


class KeyExtension:
    def get_private_key_from_wif(self, wif: str) -> bytes:
        """
        Converts a WIF private key to a byte array.

        :param wif: WIF private key in string format.
        :return: Private key in byte format (32 bytes).
        :raises ValueError: If the WIF key is incorrect.
        """
        assert not self.is_empty(wif)

        decoded = base58.b58decode_check(wif)
        if len(decoded) != 34 or decoded[0] != 0x80 or decoded[-1] != 0x01:
            raise ValueError("Incorrect WIF private key")

        private_key = decoded[1:-1]
        return private_key

    def get_public_key(self, private_key: bytes) -> bytes:
        """
        Extract public key from Private key

        :param private_key: Private key in byte format (32 bytes).
        :return: compressed public key in byte format (33 bytes).
        :raises ValueError: If the private_key key is empty or null.
        """
        assert not self.is_empty(private_key)

        if len(private_key) != 32:
            raise ValueError(f"Incorrect len of private key, Expected: 32, Actual: {len(private_key)}")

        public_key = ecdsa.SigningKey.from_string(private_key, curve=ecdsa.NIST256p).get_verifying_key()
        compressed_public_key = public_key.to_string("compressed")
        return compressed_public_key

    def get_owner_id_by_public_key(self, public_key: bytes) -> str:
        if len(public_key) != COMPRESSED_PUBLIC_KEY_LENGTH:
            raise ValueError(f"Encoded compressed public key has wrong length. Expected {COMPRESSED_PUBLIC_KEY_LENGTH}, got {len(public_key)}")
        
        script_hash = self.get_script_hash(public_key)
        data = bytearray(DECODE_ADDRESS_LENGTH)
        data[0] = NEO_ADDRESS_VERSION
        data[1:] = script_hash
        return base58.b58encode_check(data).decode('utf-8')

    def get_script_hash(self, public_key: bytes):
        script = self.create_signature_redeem_script(public_key)
        sha256_hash = hashlib.sha256(script).digest()
        return self.get_ripemd160(sha256_hash)
    
    @staticmethod
    def create_signature_redeem_script(public_key: bytes):
        if len(public_key) != COMPRESSED_PUBLIC_KEY_LENGTH:
            raise ValueError(f"Encoded compressed public key has wrong length. Expected {COMPRESSED_PUBLIC_KEY_LENGTH}, got {len(public_key)}")

        script = bytearray([PS_IN_HASH160, COMPRESSED_PUBLIC_KEY_LENGTH])
        script.extend(public_key)
        script.append(UNCOMPRESSED_PUBLIC_KEY_LENGTH)
        script.extend(pack("<I", CHECK_SIG_DESCRIPTOR))
        return bytes(script)
    
    @staticmethod
    def get_ripemd160(value):
        if value is None:
            raise ValueError("Input parameter is missing")
        
        digest = RIPEMD160.new()
        digest.update(value)
        return digest.digest()
    
    @staticmethod
    def is_empty(sequence_symbols: bytes | str):
        if len(sequence_symbols) == 0 or sequence_symbols is None:
            raise ValueError(f"Empty sequence symbols of key: {sequence_symbols}")
        return False

    @staticmethod
    def get_hex_string(value):
        if value is None or len(value) == 0:
            raise ValueError("Input parameter is missing")

        # Convert byte array to hexadecimal string
        return f"{int.from_bytes(value, byteorder='big'):0{len(value) * 2}x}"