from uuid import UUID, uuid4
from pydantic import BaseModel

from src.customer import Customer
from src.models import NKodePolicy
from src.user_signup_session import UserSignupSession
from src.user_cipher_keys import UserCipherKeys
from src.user import User
from src.user_interface import UserInterface
from src.customer_interface import CustomerInterface


class NKodeAPI(BaseModel):
    customers: dict[UUID, Customer] = {}
    sessions: dict[UUID, UserSignupSession] = {}

    def generate_index_interface(self, customer_id: UUID) -> tuple[UUID, list[int]]:
        assert (customer_id in self.customers.keys())
        customer = self.customers[customer_id]
        set_interface = UserInterface.new(customer.interface.attrs_per_key, customer.interface.numb_of_keys)
        new_session = UserSignupSession(
            session_id=uuid4(),
            set_interface=set_interface.attr_indices,
            customer_id=customer_id,
        )
        self.sessions[new_session.session_id] = new_session
        return new_session.session_id, new_session.set_interface

    def get_login_index_interface(self, username: str, customer_id: UUID) -> list[int]:
        """
        TODO: how do we prevent a targeted denial-of-service attack?
        """
        assert (customer_id in self.customers.keys())
        customer = self.customers[customer_id]
        assert (username in customer.users.keys())
        user = customer.users[username]
        user.user_interface.shuffle_interface()
        return user.user_interface.attr_indices

    def set_nkode(
            self, username: str,
            customer_id: UUID,
            key_selection: list[int],
            session_id: UUID
    ) -> list[int]:
        assert (customer_id in self.customers.keys())
        customer = self.customers[customer_id]
        assert (username not in customer.users.keys())
        assert (session_id in self.sessions.keys())
        self.sessions[session_id].set_user_nkode(username, customer, key_selection)
        return self.sessions[session_id].confirm_interface

    def confirm_nkode(self, username: str, customer_id: UUID, confirm_key_entry: list[int], session_id: UUID) -> bool:
        assert (
                session_id in self.sessions.keys() and
                customer_id == self.sessions[session_id].customer_id and
                username == self.sessions[session_id].username
        )
        customer = self.customers[customer_id]
        new_user = self.sessions[session_id].create_user(username, customer, confirm_key_entry)
        self.customers[customer_id].add_new_user(new_user)
        del self.sessions[session_id]
        return True

    def login(self, customer_id: UUID, username: str, key_selection: list[int]) -> bool:
        assert (customer_id in self.customers.keys())
        customer = self.customers[customer_id]
        return customer.valid_key_entry(username, key_selection)

    def renew_keys(self, customer_id: UUID) -> bool:
        assert (customer_id in self.customers.keys())
        return self.customers[customer_id].renew_keys()

    def create_new_customer(self, numb_keys: int, numb_sets: int, nkode_policy: NKodePolicy) -> UUID:
        new_customer = Customer(
            customer_id=uuid4(),
            interface=CustomerInterface.new(numb_keys, numb_sets),
            users={},
            nkode_policy=nkode_policy
        )
        self.customers[new_customer.customer_id] = new_customer

        return new_customer.customer_id