import base64
import hashlib
from typing import Dict, Any
import json
import requests
from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from os import urandom

BLOCK_SIZE = 16

def pad(data: bytes) -> bytes:
    padder = padding.PKCS7(algorithms.AES.block_size).padder()
    padded_data = padder.update(data) + padder.finalize()
    return padded_data

def unpad(data: bytes) -> bytes:
    unpadder = padding.PKCS7(algorithms.AES.block_size).unpadder()
    unpadded_data = unpadder.update(data) + unpadder.finalize()
    return unpadded_data

def bytes_to_key(data: bytes, salt: bytes, output: int = 48) -> bytes:
    assert len(salt) == 8, len(salt)
    data += salt
    key = hashlib.md5(data).digest()
    final_key = key
    while len(final_key) < output:
        key = hashlib.md5(key + data).digest()
        final_key += key
    return final_key[:output]

def encrypt(message: bytes, passphrase: bytes) -> bytes:
    salt = urandom(8)
    key_iv = bytes_to_key(passphrase, salt, 32 + 16)
    key = key_iv[:32]
    iv = key_iv[32:]

    # Create AES cipher object
    cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())
    encryptor = cipher.encryptor()

    encrypted_message = encryptor.update(pad(message)) + encryptor.finalize()
    return base64.b64encode(b"Salted__" + salt + encrypted_message)

def decrypt(encrypted: bytes, passphrase: bytes) -> bytes:
    encrypted = base64.b64decode(encrypted)
    assert encrypted[0:8] == b"Salted__"
    salt = encrypted[8:16]
    key_iv = bytes_to_key(passphrase, salt, 32 + 16)
    key = key_iv[:32]
    iv = key_iv[32:]

    # Create AES cipher object
    cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())
    decryptor = cipher.decryptor()

    decrypted_message = decryptor.update(encrypted[16:]) + decryptor.finalize()
    return unpad(decrypted_message)

class PyCookieCloud:
    def __init__(self, url: str, uuid: str, password: str):
        self.url: str = url
        self.uuid: str = uuid
        self.password: str = password

    def check_connection(self) -> bool:
        """
        Test the connection to the CookieCloud server.

        :return: True if the connection is successful, False otherwise.
        """
        try:
            resp = requests.get(self.url)
            if resp.status_code == 200:
                return True
            else:
                return False
        except Exception as e:
            return False

    def update_cookie(self, cookie: Dict[str, Any]) -> bool:
        """
        Update cookie data to CookieCloud.

        :param cookie: cookie value to update, if this cookie does not contain 'cookie_data' key, it will be added into 'cookie_data'.
        :return: if update success, return True, else return False.
        """
        if 'cookie_data' not in cookie:
            cookie = {'cookie_data': cookie}
        raw_data = json.dumps(cookie)
        encrypted_data = encrypt(raw_data.encode('utf-8'), self.get_the_key().encode('utf-8')).decode('utf-8')
        cookie_cloud_request = requests.post(self.url + '/update', json={'uuid': self.uuid, 'encrypted': encrypted_data})
        if cookie_cloud_request.status_code == 200:
            if cookie_cloud_request.json()['action'] == 'done':
                return True
        return False

    def get_the_key(self) -> str:
        """
        Get the key used to encrypt and decrypt data.

        :return: the key.
        """
        md5 = hashlib.md5()
        md5.update((self.uuid + '-' + self.password).encode('utf-8'))
        return md5.hexdigest()[:16]