use serde_derive::Deserialize;

use crate::constants;
use crate::errors::EmgauwaError;

#[derive(Clone, Debug, Deserialize)]
#[serde(default)]
#[allow(unused)]
pub struct Server {
	pub host: String,
	pub port: u16,
}

#[derive(Clone, Debug, Deserialize)]
#[serde(default)]
#[allow(unused)]
pub struct Logging {
	pub level: String,
	pub file: String,
}

#[derive(Clone, Debug, Deserialize, Default)]
#[serde(default)]
#[allow(unused)]
pub struct Permissions {
	pub user: String,
	pub group: String,
}

impl Default for Server {
	fn default() -> Self {
		Server {
			host: String::from("127.0.0.1"),
			port: constants::DEFAULT_PORT,
		}
	}
}

impl Default for Logging {
	fn default() -> Self {
		Logging {
			level: String::from("info"),
			file: String::from("stdout"),
		}
	}
}

pub fn load<T>(config_name: &str, env_prefix: &str) -> Result<T, EmgauwaError>
where
	for<'de> T: serde::Deserialize<'de>,
{
	let local_file = config::File::with_name(&format!("./emgauwa-{}", config_name)).required(false);

	config::Config::builder()
		.add_source(local_file)
		.add_source(
			config::Environment::with_prefix(&format!("EMGAUWA_{}", env_prefix))
				.prefix_separator("__")
				.separator("__"),
		)
		.build()?
		.try_deserialize::<T>()
		.map_err(EmgauwaError::from)
}