import type { Nonce } from "../nonce.js";

import type { bytes, bytes32, uint64 } from "./basic.js";
import type { KeyPair } from "./keypair.js";

export type Hkdf = [bytes, bytes, bytes];

export interface MessageBuffer {
  ne: bytes32;
  ns: bytes;
  ciphertext: bytes;
}

export interface CipherState {
  k: bytes32;
  // For performance reasons, the nonce is represented as a Nonce object
  // The nonce is treated as a uint64, even though the underlying `number` only has 52 safely-available bits.
  n: Nonce;
}

export interface SymmetricState {
  cs: CipherState;
  ck: bytes32; // chaining key
  h: bytes32; // handshake hash
}

export interface HandshakeState {
  ss: SymmetricState;
  s: KeyPair;
  e?: KeyPair;
  rs: bytes32;
  re: bytes32;
  psk: bytes32;
}

export interface NoiseSession {
  hs: HandshakeState;
  h?: bytes32;
  cs1?: CipherState;
  cs2?: CipherState;
  mc: uint64;
  i: boolean;
}

export interface INoisePayload {
  identityKey: bytes;
  identitySig: bytes;
  data: bytes;
}