import base64
import crc16
import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)

def hex_addr_to_base64(fullAddr, bounceable=True, testnet=False):
    print("bounceable: " + ("True" if bounceable else "no-bounceable"))
    buff = fullAddr.split(':')
    workchain = int(buff[0])
    addr_hex = buff[1]
    if len(addr_hex) != 64:
        raise Exception("hex_addr_to_base64 error: Invalid length of hexadecimal address")

    b = bytearray(36)
    b[0] = 0x51 - bounceable * 0x40 + testnet * 0x80
    b[1] = workchain % 256
    b[2:34] = bytearray.fromhex(addr_hex)
    buff = bytes(b[:34])
    crc = crc16.crc16xmodem(buff)
    # print(crc)
    b[34] = crc >> 8
    b[35] = crc & 0xff
    result = base64.b64encode(b)
    result = result.decode()
    result = result.replace('+', '-')
    result = result.replace('/', '_')
    # print([i for i in b])
    # print(b[-1])
    return result


if __name__ == "__main__":
    addr = "-1:85578413C4B97EEC2B7713A32A3AD32DF911973318B6EE0E08EB8E65C3A3135A"
    testnet = False
    print("addr raw: " + addr)
    print("network: " + ("testnet" if testnet else "mainnet"))
    b64addr = hex_addr_to_base64(addr, testnet=testnet)
    print("b64 addr: " + b64addr)