extern crate rustijvm;

use std::sync::{Arc, Mutex};
use std::io::{Cursor, Seek, SeekFrom, Read};

fn run_calc(input: &'static str, expected: &str) {
    let rc = Arc::new(Mutex::new(Cursor::new(Vec::new())));
    let mut machine = rustijvm::Machine::new_from_file("files/advanced/SimpleCalc.ijvm").unwrap();
    machine.set_input(Box::new(input.as_bytes()));
    machine.set_output(rc.clone());
    machine.run().unwrap();

    let mut out = rc.lock().unwrap();
    let mut output = String::new();

    out.seek(SeekFrom::Start(0)).unwrap();
    out.read_to_string(&mut output).unwrap();

    assert_eq!(output, expected);
}

#[test]
fn advanced5_level1() {
    run_calc("0 0 + ? .", "0\n");
    run_calc("0 9 + ? .", "9\n");
    run_calc("9 0 + ? .", "9\n");
    run_calc("9 9 - ? .", "0\n");
}

#[test]
fn advanced5_level2() {
    run_calc("    5 4 -?.", "1\n");
    run_calc("  8  8 8  - + ?.", "8\n");
}

#[test]
fn advanced5_level3() {
    run_calc("1 1 + 1 1 + 1 1 + 1 1 + 1 1 + +-++?.", "2\n");
    run_calc("9 8 -9 7-9 6-9 5-9 4-9 3-9 2-9 1-9 0- -+-+-+-+?.", "1\n");
}