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use std::cmp::{Ordering, Ord};
use std::ops::{Add, Sub};
use errors::EventError;
use chrono;
use chrono::{TimeZone, Duration, Datelike, Local, Weekday};
use chrono::offset::Utc;
use chrono_tz::{Tz, UTC};
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum Date {
Time(chrono::DateTime<Tz>),
AllDay(chrono::Date<Tz>),
}
impl Date {
pub fn new() -> Date {
Date::Time(UTC.timestamp(0, 0))
}
pub fn now() -> Date {
Date::Time(UTC.from_utc_datetime(&Utc::now().naive_utc()))
}
pub fn parse(date_str: &str, time_zone: &str) -> Result<Self, EventError> {
let absolute_time = date_str.chars().rev().next().unwrap() == 'Z';
let tz: Tz = if absolute_time {
UTC
} else {
// FIXME: this should not be UTC but local timezone
time_zone.parse().unwrap_or(UTC)
};
let date = match date_str.find("T") {
Some(_) => {
let date_pattern = if absolute_time {
"%Y%m%dT%H%M%SZ"
} else {
"%Y%m%dT%H%M%S"
};
let time = tz.datetime_from_str(&date_str, date_pattern).unwrap_or(
UTC.timestamp(
0,
0,
),
);
Date::Time(time)
}
None => {
Date::AllDay(tz.ymd(
date_str[0..4].parse()?,
date_str[4..6].parse()?,
date_str[6..8].parse()?,
))
}
};
Ok(date)
}
pub fn format(&self, fmt: &str) -> String {
match *self {
Date::Time(t) => t.with_timezone(&Local).format(fmt).to_string(),
Date::AllDay(d) => d.format(fmt).to_string(),
}
}
pub fn same_day(&self, other: &Date) -> bool {
self.day() == other.day() && self.month() == other.month() && self.year() == self.year()
}
pub fn day(&self) -> u32 {
match *self {
Date::Time(t) => t.day(),
Date::AllDay(d) => d.day(),
}
}
pub fn weekday(&self) -> Weekday {
match *self {
Date::Time(t) => t.weekday(),
Date::AllDay(d) => d.weekday(),
}
}
pub fn month(&self) -> u32 {
match *self {
Date::Time(t) => t.month(),
Date::AllDay(d) => d.month(),
}
}
pub fn with_month(&self, month: u32) -> Option<Date> {
Some(match *self {
Date::Time(t) => Date::Time(t.with_month(month)?),
Date::AllDay(d) => Date::AllDay(d.with_month(month)?),
})
}
pub fn year(&self) -> i32 {
match *self {
Date::Time(t) => t.year(),
Date::AllDay(d) => d.year(),
}
}
pub fn with_year(&self, year: i32) -> Option<Date> {
Some(match *self {
Date::Time(t) => Date::Time(t.with_year(year)?),
Date::AllDay(d) => Date::AllDay(d.with_year(year)?),
})
}
}
impl Ord for Date {
fn cmp(&self, other: &Self) -> Ordering {
match *self {
Date::Time(t1) => {
match *other {
Date::Time(t2) => t1.cmp(&t2),
Date::AllDay(d) => cmp_date_time(&d, &t1).reverse(),
}
}
Date::AllDay(d1) => {
match *other {
Date::Time(t) => cmp_date_time(&d1, &t),
Date::AllDay(d2) => d1.cmp(&d2),
}
}
}
}
}
impl PartialOrd for Date {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Add<Duration> for Date {
type Output = Date;
fn add(self, other: Duration) -> Date {
match self {
Date::Time(d) => Date::Time(d + other),
Date::AllDay(d) => Date::AllDay(d + other),
}
}
}
impl Sub<Date> for Date {
type Output = Duration;
fn sub(self, other: Self) -> Duration {
match self {
Date::Time(t1) => {
match other {
Date::Time(t2) => t1 - t2,
Date::AllDay(d) => t1.date() - d,
}
}
Date::AllDay(d1) => {
match other {
Date::Time(t) => d1 - t.date(),
Date::AllDay(d2) => d1 - d2,
}
}
}
}
}
fn cmp_date_time<T: TimeZone>(date: &chrono::Date<T>, time: &chrono::DateTime<T>) -> Ordering {
let d2 = time.date();
if date.eq(&d2) {
return Ordering::Less;
}
date.cmp(&d2)
}
#[cfg(test)]
mod tests {
use super::Date;
use chrono::Datelike;
use chrono::Timelike;
#[test]
fn date_parse_time() {
match Date::parse("19361020T120000", "").unwrap() {
Date::Time(time) => {
assert_eq!(time.year(), 1936);
assert_eq!(time.hour(), 12);
assert_eq!(time.day(), 20);
}
_ => assert!(true),
}
}
}
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