/// Generate a random environment name in the format `adjective-noun-NNNN`.
///
/// Uses the `petname` crate's curated word lists (Dustin Kirkland's petname
/// project, widely adopted across Docker/Ubuntu/Heroku-style tooling).
/// The 4-digit suffix reduces collision likelihood (~90M+ total combinations).
pub(crate) fn generate_name() -> String {
let base = petname::petname(2, "-").unwrap_or_else(|| "env".to_string());
let num = random_suffix();
format!("{base}-{num}")
}
/// 4-digit random suffix (1000–9999) using std randomness.
fn random_suffix() -> u16 {
use std::collections::hash_map::RandomState;
use std::hash::{BuildHasher, Hasher};
let hash = RandomState::new().build_hasher().finish();
(hash % 9000) as u16 + 1000
}
#[cfg(test)]
mod tests {
use crate::names::generate_name;
#[test]
fn generated_name_is_dns_safe() {
for _ in 0..100 {
let name = generate_name();
assert!(name.len() >= 3);
assert!(name.len() <= 63);
assert!(!name.starts_with('-'));
assert!(!name.ends_with('-'));
assert!(!name.contains("--"));
assert!(
name.chars()
.all(|c| c.is_ascii_lowercase() || c.is_ascii_digit() || c == '-')
);
}
}
#[test]
fn generated_names_are_not_identical() {
let a = generate_name();
let b = generate_name();
assert_ne!(a, b);
}
}
