use serde::Deserialize;

#[derive(Debug, Clone, Deserialize)]
/// Top-level application configuration
pub struct Config {}

/// Parse configuration from the expected files and environment variables
pub fn load_config() -> Result<Config, config::ConfigError> {
    use config::{Environment, File};

    let pkg_name = env!("CARGO_PKG_NAME");

    config::Config::builder()
        .set_default("server.port", 8080)?
        .add_source(File::with_name(&format!("/etc/{pkg_name}/config")).required(false))
        .add_source(File::with_name(&format!("/etc/{pkg_name}")).required(false))
        .add_source(File::with_name("config").required(false))
        .add_source(Environment::with_prefix(pkg_name).separator("_"))
        .build()?
        .try_deserialize()
}