from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
import os
import sys
import socket
import datetime
import struct
from crccheck.crc import Crc16, CrcArc
import binascii

class StringMaker:
    def __init__(self):
        pass

    def send_alarm(self, alarm_command, user_id, key, host, port, V):
        key = bytes.fromhex(key)
        now = datetime.datetime.now()
        date_part = now.strftime("%m-%d-%Y")
        time_part = now.strftime("%H:%M:%S")
        input_string = f'"*ADM-CID"0000RA2L0000#{user_id}[#{user_id}|{alarm_command}][V{V}]_{time_part},{date_part}'

        print(f"Input String: {input_string}")

        part_before, part_after = input_string.split('[', 1)
        part_before = f"{part_before}["
        part_after = "|" + part_after

        encryption_part = self.add_padding(part_after)
        print(f"Padded Input: {encryption_part}")

        encrypted_hex = self.encrypt(encryption_part, key)
        print(f"Encrypted Hex: {encrypted_hex}")

        before_and_after = f"{part_before}{encrypted_hex}"

        crc_hash = self.calculate_crc(before_and_after.encode())
        with_hash = f"{crc_hash}{before_and_after}"

        with_line_feed_and_return = f"\u000A{with_hash}\u000D"
        message_bytes = with_line_feed_and_return.encode()

        tcp_response = self.send_bytes_with_tcp(host, port, message_bytes)
        return tcp_response.decode() if tcp_response is not None else "No data from Patriot"

    def to_ascii_hex(self, byte_array):
        return byte_array.hex()


    def add_padding(self, input_string):
        # Convert the input string to bytes
        input_bytes = input_string.encode()
        # Calculate the pad length
        pad_length = 16 - len(input_bytes) % 16
        pad_length = pad_length if pad_length != 16 else 0
        # Generate padding with ASCII characters
        padding_ascii = bytes([i % 26 + 65 for i in range(pad_length)])
        # Concatenate padding and input bytes
        padded_bytes = padding_ascii + input_bytes

        return padded_bytes

    def get_string_after_first_occurrence(self, input_string, character):
        index = input_string.find(character)
        return input_string[index + 1:] if index != -1 else ""

    def encrypt(self, input_bytes, key):
        key_bytes = key
        data_bytes = input_bytes

        # Use the same initialization vector (IV) as in your decryption function
        iv = b'\x00' * 16

        cipher = Cipher(algorithms.AES(key_bytes), modes.CBC(iv), backend=default_backend())
        encryptor = cipher.encryptor()

        encrypted_data = encryptor.update(data_bytes) + encryptor.finalize()

        return binascii.hexlify(encrypted_data).decode('ascii')

    def decrypt(self, input_bytes, key):
        cipher = Cipher(algorithms.AES(key), modes.CFB(os.urandom(16)), backend=default_backend())
        decryptor = cipher.decryptor()
        decrypted = decryptor.update(input_bytes) + decryptor.finalize()
        return decrypted.decode()

    def send_bytes_with_tcp(self, ip_address, port, data):
        try:
            with socket.create_connection((ip_address, port), timeout=5) as client:
                client.sendall(data)
                response = client.recv(1024)
                return response
        except Exception as ex:
            print(f"Error: {ex}")
            return None

    def convert_to_dms_format(self, dd, direction):
        degrees = int(abs(dd))
        minutes = (abs(dd) - degrees) * 60
        seconds = (minutes - int(minutes)) * 60
        sign = 'W' if dd < 0 and direction == "X" else 'S' if dd < 0 and direction == "Y" else 'E' if direction == "X" else 'N'
        return f"{direction}{degrees:03d}{sign}{int(minutes):02d}.{int(round(seconds * 10000000)):07d}"

    def calculate_crc(self, input_bytes):
        crc_arc = CrcArc()
        crc_arc.process(input_bytes)
        crc_value_hex = crc_arc.finalhex()
        return f"{crc_value_hex.upper()}{len(input_bytes):04X}"

arg1 = sys.argv[1] if len(sys.argv) > 1 else None
arg2 = sys.argv[2] if len(sys.argv) > 2 else None
arg3 = sys.argv[3] if len(sys.argv) > 3 else None
host = sys.argv[4] if len(sys.argv) > 4 else None
arg5 = sys.argv[5] if len(sys.argv) > 5 else None
signalType = sys.argv[6] if len(sys.argv) > 6 else "PA"
zone = sys.argv[7] if len(sys.argv) > 7 else "00"
arg8 = sys.argv[8] if len(sys.argv) > 8 else "0"
arg9 = sys.argv[9] if len(sys.argv) > 9 else "0"
arg10 = sys.argv[10] if len(sys.argv) > 10 else "0"
V = sys.argv[11] if len(sys.argv) > 11 else None
port = int(arg5)

def main():
    global host
    global port
    global arg1
    global arg2
    global arg3
    global signalType
    global zone
    global arg8
    global arg9
    global V
    string_maker = StringMaker()
    key = arg10.encode().hex().upper()
    ClientID = arg1
    SignalType = signalType
    Zone = zone
    if len(Zone) == 1:
        Zone = "00" + Zone
    if len(Zone) == 2:
        Zone = "0" + Zone
    SignalAndZone = SignalType + " 00 " + Zone

    result = string_maker.send_alarm(SignalAndZone, int(ClientID), key, host, port, V)
    print(result)


if __name__ == "__main__":
    main()