import socket
from common import *
import socket
from AES import AESCipher
import os
from random import randint

HOST = "127.0.0.1"
PORT = SERVICE_PORT

def process_message(message):
    print(message)
    message = message.split("||")

    if message[0] == "request":
        """
        T_c_s = {ID_C + T_A + K_c_s}K_s

        M5 = [{ID_C + T_A + S_R + N3}K_c_s + T_c_s]
        M6 = [{Resposta, N3}K_c_s]
        """
        body = message[1].split(",")
        K_s = C_K_s
        T_c_s_AES = AESCipher(K_s)

        M5_inner = body[0]
        T_c_s = body[1]

        T_c_s = T_c_s_AES.decrypt(T_c_s)
        T_c_s = T_c_s.split(",")
        ID_C = T_c_s[0]
        T_A = T_c_s[1]
        K_c_s = T_c_s[2]

        M5_inner_AES = AESCipher(K_c_s)
        M5_inner = M5_inner_AES.decrypt(M5_inner)
        M5_inner = M5_inner.split(",")
        ID_S = M5_inner[2]
        N3 = M5_inner[3]

        # generate M6

        M6_inner = f"{randint(0, 100)},{N3}"
        M6_inner_AES = AESCipher(K_c_s)
        M6_inner = M6_inner_AES.encrypt(M6_inner)

        M6 = f"{M6_inner}"
        return M6

def main():
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind((HOST, PORT))
        s.listen()
        while True:
            conn, addr = s.accept()
            with conn:
                print(f"Connected by {addr}")
                all_data = ""
                data = conn.recv(4096)
                all_data += data.decode()

                response = process_message(all_data)

                conn.sendall(response.encode())

if __name__ == "__main__":
    main()