use config::{Config, ConfigError};
use serde::Deserialize;

#[derive(Debug, Deserialize)]
//#[allow(unused)]
pub struct Settings {
    pub address: String,
    pub port: u16,
}

impl Settings {
    pub fn new() -> Result<Self, ConfigError> {
        let s = Config::builder()
            .set_default("port", 9090)?
            .set_default("address", "127.0.0.1")?
            .add_source(
                config::Environment::with_prefix("MTT")
                    .try_parsing(true)
                    .separator("_")
                    .list_separator(" "),
            )
            .build()?;
        s.try_deserialize()
    }
}

#[cfg(test)]
mod settings_tests {
    use super::*;
    use serial_test::serial;

    #[test]
    #[serial]
    fn defaults() {
        let set = Settings::new().unwrap();
        println!("{:?}", set);
        assert_eq!(set.port, 9090);
        assert_eq!(set.address, "127.0.0.1");
    }

    #[test]
    #[serial]
    fn port_env() {
        std::env::set_var("MTT_PORT", "7825");
        let set = Settings::new().unwrap();
        println!("{:?}", set);
        assert_eq!(set.port, 7825);
        std::env::remove_var("MTT_PORT");
    }
}