use std::env;
use std::path::PathBuf;

use dirs::config_dir;
use getopts::Options;
use log::LevelFilter;

#[derive(Debug)]
pub struct Config {
	pub config_directory: PathBuf,
	pub log_level: LevelFilter,
}

impl Config {
	pub fn from_args() -> Config {
		let args: Vec<String> = env::args().collect();
		let program = args[0].clone();

		let mut opts = Options::new();
		opts.optopt("c", "config", "config directory", "CONFIG");
		opts.optopt(
			"l",
			"level",
			"log level (error, warn, info, debug, trace)",
			"LEVEL",
		);
		opts.optflag("h", "help", "print this help menu");

		let matches = match opts.parse(&args[1..]) {
			Ok(m) => m,
			Err(e) => {
				println!("FATAL: Error parsing arguments: {:?}", e);
				std::process::exit(1);
			}
		};

		if matches.opt_present("h") {
			let brief = format!("Usage: {} [options]", program);
			print!("{}", opts.usage(&brief));
			std::process::exit(0);
		}

		let config_directory = if let Some(dir) = matches.opt_str("c") {
			PathBuf::from(dir)
		} else if let Some(mut dir) = config_dir() {
			dir.push("sup");
			dir
		} else {
			PathBuf::from(".")
		};

		let mut log_level: LevelFilter = LevelFilter::Info;

		if let Some(raw_level) = matches.opt_str("l") {
			log_level = match raw_level.as_str() {
				"error" => LevelFilter::Error,
				"warn" => LevelFilter::Warn,
				"info" => LevelFilter::Info,
				"debug" => LevelFilter::Debug,
				"trace" => LevelFilter::Trace,
				_ => {
					println!("FATAL: unknown log level: {}", raw_level);
					println!("Options are error, warn, info, debug, or trace");
					std::process::exit(1);
				}
			};
		};

		Config {
			config_directory,
			log_level,
		}
	}
}