use std::sync::Arc;
use std::thread;
use super::db::{ DiskDB };
use super::config::LighthouseConfig;
use super::futures::sync::mpsc::{
    unbounded,
};
use super::network_libp2p::service::listen as network_listen;
use super::network_libp2p::state::NetworkState;
use super::slog::Logger;
use super::sync::run_sync_future;

use super::db::ClientDB;

/// Represents the co-ordination of the
/// networking, syncing and RPC (not-yet-implemented) threads.
pub struct Client {
    pub db: Arc<ClientDB>,
    pub network_thread: thread::JoinHandle<()>,
    pub sync_thread: thread::JoinHandle<()>,
}

impl Client {
    /// Instantiates a new "Client".
    ///
    /// Presently, this means starting network and sync threads
    /// and plumbing them together.
    pub fn new(config: &LighthouseConfig,
               log: &Logger)
        -> Self
    {
        // Open the local db
        let db = {
            let db = DiskDB::open(&config.data_dir, None);
            Arc::new(db)
        };

        // Start the network thread
        let network_state = NetworkState::new(
            &config.data_dir,
            &config.p2p_listen_port,
            &log).expect("Network setup failed"); let (network_thread, network_tx, network_rx) = {
            let (message_sender, message_receiver) = unbounded();
            let (event_sender, event_receiver) = unbounded();
            let network_log = log.new(o!());
            let thread = thread::spawn(move || {
                network_listen(
                    network_state,
                    event_sender,
                    message_receiver,
                    network_log,
                );
            });
            (thread, message_sender, event_receiver)
        };

        // Start the sync thread
        let (sync_thread, _sync_tx, _sync_rx) = {
            let (sync_out_sender, sync_out_receiver) = unbounded();
            let (sync_in_sender, sync_in_receiver) = unbounded();
            let sync_log = log.new(o!());
            let sync_db = db.clone();
            let thread = thread::spawn(move || {
                run_sync_future(
                    sync_db,
                    network_tx.clone(),
                    network_rx,
                    &sync_out_sender,
                    &sync_in_receiver,
                    sync_log,
                );
            });
            (thread, sync_in_sender, sync_out_receiver)
        };

        // Return the client struct
        Self {
            db,
            network_thread,
            sync_thread,
        }
    }
}