use {
	crypto_secretbox::{aead::Aead, KeyInit, XSalsa20Poly1305},
	ed25519_dalek::SigningKey,
	edx::{DeriveFactor, EdXchangeable},
};

const NONCE_SIZE: usize = XSalsa20Poly1305::NONCE_SIZE;
const MESSAGES: &[&str] = &["hello, world", "你好，世界", "Bonjour, monde", "Hallo Welt", "مرحبا بالعالم"];

fn main() {
	let message = MESSAGES[rand::random::<usize>() % MESSAGES.len()];
	println!("message             : \"{}\"", message);

	let alice_sign = SigningKey::from_bytes(&rand::random());
	let alice_verify = alice_sign.verifying_key();
	println!("alice signing key   : {}", hex::encode(alice_sign.as_bytes()));
	println!("alice verifying key : {}", hex::encode(alice_verify.as_bytes()));

	let bob_sign = SigningKey::from_bytes(&rand::random());
	let bob_verify = bob_sign.verifying_key();
	println!("bob signing key     : {}", hex::encode(bob_sign.as_bytes()));
	println!("bob verifying key   : {}", hex::encode(bob_verify.as_bytes()));

	let d_factor_bytes: [u8; 16] = rand::random();
	let d_factor = DeriveFactor::hashed(d_factor_bytes);
	println!("derive factor       : {}", hex::encode(d_factor_bytes));

	let alice_kex_secret = alice_sign.edxchange(&bob_verify, &d_factor);
	let alice_cipher = XSalsa20Poly1305::new(alice_kex_secret.as_bytes().into());
	let ciphertext = alice_cipher.encrypt(d_factor.0[..NONCE_SIZE].into(), message.as_bytes()).unwrap();
	println!("alice kex secret    : {}", hex::encode(alice_kex_secret.as_bytes()));
	println!("ciphertext (hex)    : {}", hex::encode(&ciphertext));
	println!("ciphertext (base32) : \"{}\"", base32::encode(base32::Alphabet::Crockford, &ciphertext).to_ascii_lowercase());

	let bob_kex_secret = bob_sign.edxchange(&alice_verify, &d_factor);
	let bob_cipher = XSalsa20Poly1305::new(bob_kex_secret.as_bytes().into());
	let plaintext = bob_cipher.decrypt(d_factor.0[..NONCE_SIZE].into(), ciphertext.as_ref()).unwrap();
	println!("bob kex secret      : {}", hex::encode(bob_kex_secret.as_bytes()));
	println!("plaintext           : \"{}\"", String::from_utf8_lossy(&plaintext));

	assert_eq!(plaintext, message.as_bytes());
}