use std::str::FromStr;

use chrono::Datelike;
use log::LevelFilter;
use simple_logger::SimpleLogger;

use crate::errors::EmgauwaError;
use crate::types::Weekday;

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

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

pub fn init_logging(level: &str) -> Result<(), EmgauwaError> {
	let log_level: LevelFilter = LevelFilter::from_str(level)
		.map_err(|_| EmgauwaError::Other(format!("Invalid log level: {}", level)))?;
	log::trace!("Log level set to {:?}", log_level);

	SimpleLogger::new()
		.with_level(log_level)
		.init()
		.map_err(|err| EmgauwaError::Other(format!("Failed to initialize logger: {}", err)))?;

	Ok(())
}

pub fn get_weekday() -> Weekday {
	(chrono::offset::Local::now()
		.date_naive()
		.weekday()
		.number_from_monday()
		- 1) as Weekday
}