///
/// Configure udev:
/// https://github.com/Grix/helios_dac/blob/master/docs/udev_rules_for_linux.md
///
mod redis_ctrl;
mod conf;
mod errors;
mod point;
mod transformer;
mod device;

use device::device_factory;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use redis_ctrl::{RedisCtrl, Order};
use conf::Conf;
use errors::LJResult;
use point::Point;
use transformer::Transformers;
use log::{LevelFilter, info, /* warn, */ error};
use env_logger::Builder;

const DEFAULT_CONF_FILE: &str = "settings.toml";

pub fn main() {
	match run_all() {
		Ok(()) => {}
		Err(err) => {
			error!("Error: {}", err);
		}
	}
}

fn run_all() -> LJResult<()> {
	// Setup configuration file and set up logs
	let filename = std::env::args().nth(1).unwrap_or_else(|| {
		DEFAULT_CONF_FILE.to_string()
	});

	let config = Conf::new(&filename);
	init_logging(&config);
	let config = config?;
	info!("*** Starting up ***");

	info!("{:?}", config);

	// Setup Redis Service
	let mut rs = RedisCtrl::new(&config.redis_url, &config.laser_id)?;

	// Setup handler for interrupt Signals
	let running = Arc::new(AtomicBool::new(true));
	let r = running.clone();
	ctrlc::set_handler(move || {
		r.store(false, Ordering::SeqCst);
	})?;

	// Setup Laser Device based on conf
	let mut tracer = device_factory(&config)?;

	// can't work, but we can add + Debug to Device to make it work...
	//dbg!(tracer);

	// Setup geometry transformers on points lists
	let transformers = config.get_transformers(); 

	// Dispatch based on redis requests
	while running.load(Ordering::SeqCst) {
		rs.set_status( tracer.status())?;
		let order = rs.get_order(config.laser_id)?;
		if order != Order::Draw {
			info!("Order: {:?}", order);
		}

		let frame = get_next_frame(&config, &transformers,
		                           &mut rs, order == Order::Black)?;
		// For now, draw all the time
		tracer.draw(frame, 2_000)?;
	}

	info!("Exiting, stoping device.");
	tracer.stop()?;
	Ok(())
}

fn init_logging(config: &LJResult<Conf>) {
	if let Ok(ref config) = config {
		if config.debug {
			let mut builder = Builder::from_default_env();
			builder
				.filter(None, LevelFilter::Info)
				.init();
			info!("Debug mode enabled from configuration file");
			return;
		}
	}
	info!("Logging level inherited from env");
	env_logger::init();
}

fn get_next_frame(
	config: &Conf,
	transformers: &[Box<dyn Transformers>],
	rs: &mut RedisCtrl,
	_black: bool,
) -> LJResult<Vec<Point>> {
	let line = rs.get(&format!("/pl/{}/0", config.laser_id))?;
	let mut line: Vec<Point> = line.into_iter()
	.map(|tpl| tpl.into())
	.collect();

	for transformer in transformers {
		line = transformer.apply(&line);
	}

	//info!("Line: {:?}", line);
	Ok(line)
}