// SPDX-License-Identifier: MIT OR Apache-2.0
// Copyright 2024 René Ladan <rene0+codeberg@freedom.nl>

use radio_datetime_utils::{RadioDateTimeUtils, LEAP_ANNOUNCED, LEAP_MISSING, LEAP_PROCESSED};

// quick and dirty parsing function
fn parse_ls(ls: Option<u8>) -> String {
    if ls.is_none() {
        return String::from("*");
    }
    let mut res = String::from("");
    let s_ls = ls.unwrap();
    if s_ls & LEAP_ANNOUNCED != 0 {
        res += "announced ";
    }
    if s_ls & LEAP_PROCESSED != 0 {
        res += "processed ";
    }
    if s_ls & LEAP_MISSING != 0 {
        res += "missing";
    }
    res
}

fn main() {
    let mut rdt = RadioDateTimeUtils::new(7);

    // initial values
    rdt.set_year(Some(24), true, false);
    rdt.set_month(Some(3), true, false);
    rdt.set_weekday(Some(3), true, false); // Wednesday
    rdt.set_day(Some(13), true, false);
    rdt.set_hour(Some(21), true, false);
    rdt.set_minute(Some(5), true, false);
    // Do NOT forget to initialize the DST field, otherwise add_minute() will
    // refuse to increase the time which ultimately results in a panic in
    // a test in set_leap_second() :
    //   thread 'main' panicked at src/lib.rs:406:16:
    //   attempt to multiply with overflow
    rdt.set_dst(Some(false), Some(false), false);
    rdt.set_leap_second(Some(false), 60);
    println!(
        "Initial                : date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} LS={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_ls(rdt.get_leap_second())
    );

    // insert a leap second, in the middle of a business week (nothing in this crate
    // dictates that leap seconds should happen at midnight, UTC? local?). Normally,
    // time station start notifying one or more hours in advance. set_leap_second()
    // currently only supports notifications one hour in advance.
    while rdt.get_minute().unwrap() < 59 {
        rdt.add_minute();
        // Keep feeding the announcement, must be at least for 50% of the last hour or part thereof:
        rdt.set_leap_second(Some(true), 60);
        // Keep internal bookkeeping up-to-date:
        rdt.bump_minutes_running();
    }
    println!(
        "Just before leap second: date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} LS={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_ls(rdt.get_leap_second())
    );
    rdt.add_minute();
    rdt.set_leap_second(Some(true), 61); // insert the leap second
    rdt.bump_minutes_running(); // optional, but a good idea
    println!(
        "Just after leap second : date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} LS={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_ls(rdt.get_leap_second())
    );
    // in the new, now normal again, hour:
    rdt.add_minute();
    rdt.set_leap_second(Some(false), 60);
    rdt.bump_minutes_running(); // optional
    println!(
        "Back to business       : date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} LS={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_ls(rdt.get_leap_second())
    );
}