extern crate ethcore_util as util;
extern crate ethcore;
extern crate rustc_serialize;
extern crate log;
extern crate env_logger;
extern crate ctrlc;

use std::env;
use log::{LogLevelFilter};
use env_logger::LogBuilder;
use ctrlc::CtrlC;
use util::*;
use ethcore::client::*;
use ethcore::service::{ClientService, NetSyncMessage};
use ethcore::ethereum;
use ethcore::blockchain::CacheSize;
use ethcore::sync::EthSync;

fn setup_log() {
	let mut builder = LogBuilder::new();
	builder.filter(None, LogLevelFilter::Info);

	if env::var("RUST_LOG").is_ok() {
		builder.parse(&env::var("RUST_LOG").unwrap());
	}

	builder.init().unwrap();
}

fn main() {
	setup_log();
	let spec = ethereum::new_frontier();
	let mut service = ClientService::start(spec).unwrap();
	let io_handler  = Arc::new(ClientIoHandler { client: service.client(), info: Default::default(), sync: service.sync() });
	service.io().register_handler(io_handler).expect("Error registering IO handler");

	let exit = Arc::new(Condvar::new());
	let e = exit.clone();
	CtrlC::set_handler(move || { e.notify_all(); });
	let mutex = Mutex::new(());
	let _ = exit.wait(mutex.lock().unwrap()).unwrap();
}

struct Informant {
	chain_info: RwLock<Option<BlockChainInfo>>,
	cache_info: RwLock<Option<CacheSize>>,
	report: RwLock<Option<ClientReport>>,
}

impl Default for Informant {
	fn default() -> Self {
		Informant {
			chain_info: RwLock::new(None),
			cache_info: RwLock::new(None),
			report: RwLock::new(None),
		}
	}
}

impl Informant {
	pub fn tick(&self, client: &Client, sync: &EthSync) {
		// 5 seconds betwen calls. TODO: calculate this properly.
		let dur = 5usize;

		let chain_info = client.chain_info();
		let queue_info = client.queue_info();
		let cache_info = client.cache_info();
		let report = client.report();
		let sync_info = sync.status();

		if let (_, &Some(ref last_cache_info), &Some(ref last_report)) = (self.chain_info.read().unwrap().deref(), self.cache_info.read().unwrap().deref(), self.report.read().unwrap().deref()) {
			println!("[ {} {} ]---[ {} blk/s | {} tx/s | {} gas/s  //··· {}/{} peers, {} downloaded, {} queued ···//  {} ({}) bl  {} ({}) ex ]",
				chain_info.best_block_number,
				chain_info.best_block_hash,
				(report.blocks_imported - last_report.blocks_imported) / dur,
				(report.transactions_applied - last_report.transactions_applied) / dur,
				(report.gas_processed - last_report.gas_processed) / From::from(dur),

				sync_info.num_active_peers,
				sync_info.num_peers,
				sync_info.blocks_received,
				queue_info.queue_size,

				cache_info.blocks,
				cache_info.blocks as isize - last_cache_info.blocks as isize,
				cache_info.block_details,
				cache_info.block_details as isize - last_cache_info.block_details as isize
			);
		}

		*self.chain_info.write().unwrap().deref_mut() = Some(chain_info);
		*self.cache_info.write().unwrap().deref_mut() = Some(cache_info);
		*self.report.write().unwrap().deref_mut() = Some(report);
	}
}

const INFO_TIMER: TimerToken = 0;

struct ClientIoHandler {
	client: Arc<Client>,
	sync: Arc<EthSync>,
	info: Informant,
}

impl IoHandler<NetSyncMessage> for ClientIoHandler {
	fn initialize(&self, io: &IoContext<NetSyncMessage>) { 
		io.register_timer(INFO_TIMER, 5000).expect("Error registering timer");
	}

	fn timeout(&self, _io: &IoContext<NetSyncMessage>, timer: TimerToken) {
		if INFO_TIMER == timer {
			self.info.tick(&self.client, &self.sync);
		}
	}
}