use rand::Rng;

pub fn main () {
	let passphrase = passphrase (" ", 8);
	println! ("{}", passphrase);
}

pub fn passphrase (separator: &str, len: usize) -> String {
	let diceware = Diceware::default ();
	
	let random_words: Vec <&str> = (0..len)
	.map (|_| diceware.random_word ())
	.collect ();
	
	random_words.join (separator)
}

pub struct Diceware {
	words: Vec <String>,
}

impl Default for Diceware {
	fn default () -> Self 
	{
		let wordlist = include_str! ("eff_short_wordlist_1.txt");
		let words: Vec <_> = wordlist.split ('\n').take (1253).map (str::to_string).collect ();
		
		assert_eq! (words.len (), 1253);
		assert_eq! (words [0], "acid");
		assert_eq! (words [600], "large");
		assert_eq! (words [1252], "zoom");
		
		Self {
			words,
		}
	}
}

impl Diceware {
	pub fn random_word (&self) -> &str 
	{
		&self.words [rand::thread_rng ().gen_range (0..self.words.len ())]
	}
}