use std::time::Instant;
use rand::prelude::*;
use std::f64::consts;
use console::Term;

const MAX_LOOPS: u64 = 1000000;

fn main() {
    let mut total_count = 0;
    let now = Instant::now();
    let term = Term::stdout();
    println!();
    for i in 0..MAX_LOOPS {
        let count = get_sum_count();
        total_count += count;
        if cfg!(show_msg) {
            let average = total_count as f64 / i as f64;
            let pererror = (average - consts::E).abs() / consts::E * 100.0;
            let cur_percent = i as f64 / MAX_LOOPS as f64 * 100.0;
            term.move_cursor_up(1).ok();
            term.write_line(&format!(" {:6.10}\t{:.10}\t{:.2}% err\t{:.2}%", i, average, pererror, cur_percent)).ok();
        }
        //console.log(i.toString().padEnd(10), average.toString().padEnd(20), pererror.toString().padEnd(22), "%err", " ", " ", currentPercentage + "% complete");
    }
    let average = total_count as f64 / MAX_LOOPS as f64;
    println!("---------------------------");
    println!("Iterations: {}", MAX_LOOPS);
    println!("Final Average: {}", average);
    println!("Took: {:?}", now.elapsed())
}

fn get_sum_count() -> u64 {
	let mut count: u64 = 0;
	let mut sum: f64 = 0.0;
    while sum <= 1.0 {
        count += 1;
		sum += rand::thread_rng().gen::<f64>();
    }
	//console.log("Count=" + currentCount + " | Sum: " + sum + " | i=" + i)
	return count;
}