use nats::{NatsConfig, NatsMode};

fn section(url: Option<&str>, mode: &str) -> config::NatsConfig {
    config::NatsConfig {
        url: url.map(str::to_owned),
        mode: mode.into(),
        ..Default::default()
    }
}

#[test]
fn errors_without_nats_url() {
    assert!(NatsConfig::from_config(&config::NatsConfig::default()).is_err());
}

#[test]
fn defaults_with_only_url() {
    let cfg = NatsConfig::from_config(&config::NatsConfig {
        url: Some("nats://localhost:4222".into()),
        ..Default::default()
    })
    .unwrap();
    assert_eq!(cfg.url, "nats://localhost:4222");
    assert_eq!(cfg.mode, NatsMode::JetStream);
    assert_eq!(cfg.subject_prefix, "movies-diary.events");
    assert_eq!(cfg.stream_name, "MOVIES_DIARY_EVENTS");
    assert_eq!(cfg.consumer_name, "worker");
}

#[test]
fn core_mode_parsed() {
    let cfg = NatsConfig::from_config(&section(Some("nats://test:4222"), "core")).unwrap();
    assert_eq!(cfg.url, "nats://test:4222");
    assert_eq!(cfg.mode, NatsMode::Core);
}

#[test]
fn invalid_mode_errors() {
    assert!(NatsConfig::from_config(&section(Some("nats://test:4222"), "kafka")).is_err());
}