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132 lines
3.5 KiB
132 lines
3.5 KiB
use crate::Date;
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use chrono::{
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DateTime, Duration, FixedOffset as Offset, Local, NaiveDateTime, NaiveTime, TimeZone, Timelike,
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Utc,
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};
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use std::{cmp::Ordering, ops::Sub};
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/// A convenience wrapper around [DateTime][t] with fixed timezone
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///
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/// [t]: chrono::DateTime
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#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
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pub struct Time {
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inner: DateTime<Offset>,
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}
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impl From<DateTime<Offset>> for Time {
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fn from(inner: DateTime<Offset>) -> Self {
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Self { inner }
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}
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}
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impl<'t> Sub for &'t Time {
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type Output = Duration;
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fn sub(self, o: &'t Time) -> Self::Output {
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self.inner - o.inner
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}
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}
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impl ToString for Time {
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fn to_string(&self) -> String {
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format!("{}", self.inner.format("%Y-%m-%d %H:%M:%S%:z"))
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}
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}
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impl Time {
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/// Get the current local time and pin it to a fixed Tz offset
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pub fn now() -> Self {
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let now = Local::now();
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Self {
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inner: build_datetime(
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now.time()
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.with_second(0)
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.and_then(|t| t.with_nanosecond(0))
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.unwrap(),
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),
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}
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}
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pub(crate) fn date(&self) -> chrono::Date<Offset> {
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self.inner.date()
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}
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/// Check if a time stamp happened _after_ a date
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pub fn after(&self, date: &Date) -> bool {
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&Date::from(self.date()) > date
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}
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#[cfg(test)]
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pub(crate) fn fixed(hour: u32, min: u32, sec: u32) -> Self {
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Self {
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inner: build_datetime(NaiveTime::from_hms(hour, min, sec)),
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}
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}
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/// Return a new instance that is rounded to nearest 15 minutes
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///
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/// It uses the internally provided offset to do rounding, meaning
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/// that the timezone information will not change, even when
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/// rounding values that were created in a different timezone.
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pub fn round(&self) -> Self {
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let naive = self.inner.time();
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let (new_min, incr_hour) = match naive.minute() {
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// 0-7 => (0, false)
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m if m >= 0 && m < 7 => (0, false),
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// 7-22 => (15, false)
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m if m >= 7 && m < 22 => (15, false),
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// 22-37 => (30, false)
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m if m >= 22 && m < 37 => (30, false),
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// 37-52 => (45, false)
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m if m >= 37 && m < 52 => (45, false),
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// 52-59 => (0, true)
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m if m >= 52 && m <= 59 => (0, true),
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_ => unreachable!(),
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};
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let hour = naive.hour();
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let new = NaiveTime::from_hms(if incr_hour { hour + 1 } else { hour }, new_min, 0);
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let offset = self.inner.offset();
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let date = self.inner.date();
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Self {
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inner: DateTime::from_utc(NaiveDateTime::new(date.naive_local(), new), *offset),
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}
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}
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pub fn hour(&self) -> u32 {
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self.inner.hour()
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}
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pub fn minute(&self) -> u32 {
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self.inner.minute()
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}
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pub fn second(&self) -> u32 {
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self.inner.second()
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}
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}
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/// Build a DateTime with the current local fixed offset
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fn build_datetime(nt: NaiveTime) -> DateTime<Offset> {
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let date = Utc::now().date().naive_local();
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let offset = Local.offset_from_utc_date(&date);
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DateTime::from_utc(NaiveDateTime::new(date, nt), offset)
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}
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#[test]
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fn simple() {
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let t = Time::fixed(10, 44, 0);
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let round = t.round();
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assert_eq!(round.minute(), 45);
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let t = Time::fixed(6, 8, 0);
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let round = t.round();
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assert_eq!(round.minute(), 15);
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let t = Time::fixed(6, 55, 0);
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let round = t.round();
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assert_eq!(round.minute(), 0);
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assert_eq!(round.hour(), 7);
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}
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