// Copyright 2023 System76 <info@system76.com>
// SPDX-License-Identifier: MPL-2.0

use chrono::TimeZone;

const TZ_FORMAT: &str = "%a %Y-%m-%d %H:%M:%S %Z";
const RTC_FORMAT: &str = "%a %Y-%m-%d %H:%M:%S";
const CHOICES: &[&str] = &["no", "yes"];

#[tokio::main]
pub async fn main() -> zbus::Result<()> {
    let connection = zbus::Connection::system().await?;
    let proxy = timedate_zbus::TimeDateProxy::new(&connection).await?;

    let ntp_service = if proxy.ntp().await? {
        "active"
    } else {
        "inactive"
    };

    let rtc_in_local = proxy.local_rtc().await?;
    let rtc_time_usecs = proxy.rtctime_usec().await?;
    let time_usecs = proxy.time_usec().await?;
    let timezone = proxy.timezone().await?;

    let tz: chrono_tz::Tz = timezone.parse().unwrap();

    let datetime = tz.timestamp_millis_opt((time_usecs / 1000) as i64).unwrap();

    let rtc_millis = (rtc_time_usecs / 1000) as i64;
    let rtc_time = (if rtc_in_local {
        tz.timestamp_millis_opt(rtc_millis).unwrap()
    } else {
        chrono_tz::UTC.timestamp_millis_opt(rtc_millis).unwrap()
    })
    .format(RTC_FORMAT);

    let local = datetime.format(TZ_FORMAT);
    let universal = datetime.with_timezone(&chrono_tz::UTC).format(TZ_FORMAT);
    let tz_string = datetime.format("%Z, %z");

    let rtc_in_local = CHOICES[usize::from(rtc_in_local)];
    let synchronized = CHOICES[usize::from(proxy.ntp_synchronized().await.unwrap_or_default())];

    println!(
        "               Local time: {local}
           Universal time: {universal}
                 RTC time: {rtc_time}
                Time zone: {timezone} ({tz_string})
System clock synchronized: {synchronized}
              NTP Service: {ntp_service}
          RTC in local TZ: {rtc_in_local}"
    );

    Ok(())
}