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

use radio_datetime_utils::{RadioDateTimeUtils, DST_ANNOUNCED, DST_PROCESSED, DST_SUMMER};

// quick and dirty parsing function
fn parse_dst(dst: Option<u8>) -> String {
    if dst.is_none() {
        return String::from("*");
    }
    let mut res = String::from("");
    let s_dst = dst.unwrap();
    if s_dst & DST_ANNOUNCED != 0 {
        res += "announced ";
    }
    if s_dst & DST_PROCESSED != 0 {
        res += "processed ";
    }
    if s_dst & DST_SUMMER != 0 {
        res += "summer";
    }
    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);
    rdt.set_dst(Some(false), Some(false), false);
    println!(
        "Initial           : date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} DST={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_dst(rdt.get_dst())
    );

    // switch to DST, in the middle of a business week (nothing in this crate
    // dictates that DST switches should happen on Sunday nights). Normally,
    // time station start notifying one or more hours in advance. set_dst()
    // 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_dst(Some(false), Some(true), false);
        // Keep internal bookkeeping up-to-date:
        rdt.bump_minutes_running();
    }
    println!(
        "Just before switch: date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} DST={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_dst(rdt.get_dst())
    );
    rdt.add_minute();
    rdt.set_dst(Some(true), Some(true), false); // compulsory, sign off the new DST value
    rdt.bump_minutes_running(); // optional, but a good idea
    println!(
        "Just after switch : date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} DST={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_dst(rdt.get_dst())
    );
    // in the new, now normal again, hour:
    rdt.add_minute();
    rdt.set_dst(Some(true), Some(false), false);
    rdt.bump_minutes_running(); // optional
    println!(
        "Back to business  : date={:?}-{:?}-{:?} weekday={:?} time={:?}:{:?} DST={}",
        rdt.get_year(),
        rdt.get_month(),
        rdt.get_day(),
        rdt.get_weekday(),
        rdt.get_hour(),
        rdt.get_minute(),
        parse_dst(rdt.get_dst())
    );
}