use std::fs::File;
use std::io::BufReader;
use std::io::BufRead;

use std::thread::spawn;
use std::sync::mpsc::{SyncSender, Receiver, sync_channel};

fn main() {
    let (tx, rx): (SyncSender<String>, Receiver<String>) = sync_channel::<String>(0);

    // Reader thread.
    spawn(move || {
        let file = File::open("input.txt").unwrap();
        let reader = BufReader::new(file);

        for line in reader.lines() {
            match line {
                Ok(msg) => tx.send(msg).unwrap(),
                Err(e) => println!("{}", e)
            }
        }

        drop(tx);
    });

    // Writer thread.
    spawn(move || {
        let mut loop_count: u16 = 0;

        loop {
            let recvd = rx.recv();

            match recvd {
                Ok(msg) => {
                    println!("{}", msg);
                    loop_count += 1;
                },
                Err(_) => break // rx.recv() will only err when tx is closed.
            }
        }

        println!("Line count: {}", loop_count);
    }).join().unwrap();
}