use config::{Config, Environment, File};
use serde::Deserialize;

#[derive(Debug, Deserialize, Clone)]
pub struct Settings {
    pub server: ServerSettings,
    pub app: AppSettings,
}

#[derive(Debug, Deserialize, Clone)]
pub struct AppSettings {
    pub heartbeat_interval_secs: u64,
    pub metrics_interval_secs: u64,
    pub port: u16,
}

#[derive(Debug, Deserialize, Clone)]

pub struct ServerSettings {
    pub url: String,
}

impl Settings {
    pub fn new() -> Result<Self, config::ConfigError> {
        // Load .env file first
        dotenvy::dotenv().ok();

        // Merge settings from multiple sources
        let builder = config::Config::builder()
            .add_source(config::File::with_name("Settings").required(false)) // Settings.toml optional
            .add_source(Environment::default().separator("_"));

        builder.build()?.try_deserialize()
    }
}