use std::env;
use std::fs;
use std::io::{self, BufReader, BufRead};
//use regex::Regex;
use chrono::{Duration, DateTime, FixedOffset, NaiveDateTime, TimeZone, Utc};
use chrono_tz::America::New_York;

fn main() {
    // Regexes
    //let sep = Regex::new(r":").unwrap();

    // read file argument or stdin
    let input = env::args().nth(1);
    let reader: Box<dyn BufRead> = match input {
        None => Box::new(BufReader::new(io::stdin())),
        Some(filename) => Box::new(BufReader::new(fs::File::open(filename).unwrap()))
    };

    let mut old: DateTime<FixedOffset> = DateTime::from(DateTime::<Utc>::MIN_UTC);
    let mut new: DateTime<FixedOffset> = DateTime::from(DateTime::<Utc>::MIN_UTC);

    for line in reader.lines() {
        let l: String = line.unwrap();
        let (item, timestamp) = l.split_once(':').unwrap();

        let ndt = NaiveDateTime::parse_from_str(&timestamp, "%a %b %e %H:%M:%S %Z %Y").unwrap();
        let dt  = New_York.from_local_datetime(&ndt).unwrap();
        let ts: DateTime<FixedOffset> = DateTime::parse_from_rfc3339(&dt.to_rfc3339()).unwrap();
        if old == DateTime::<Utc>::MIN_UTC {
            old = ts;
            continue;
        } else if new == DateTime::<Utc>::MIN_UTC {
            new = ts;
        } else {
            old = new;
            new = ts;
        };

        let dur: Duration = new - old;

        let weeks   = dur.num_weeks();
        let days    = dur.num_days() - weeks * 7;
        let hours   = dur.num_hours() - weeks * 7 * 24 - days * 24;
        let minutes = dur.num_minutes() - weeks * 7 * 24 * 60 - days * 24 * 60 - hours * 60;
        let seconds = dur.num_seconds() - weeks * 7 * 24 * 60 * 60 
                                        - days * 24 * 60 * 60 - hours * 60 * 60 - minutes * 60;

        println!("{}: {} weeks, {} days, {} hours, {} minutes, {} seconds", 
                 item, weeks, days, hours, minutes, seconds);
    };
}