use chrono;
use chrono::prelude::*;
use serde_derive::{Deserialize, Serialize};
use serde_json;
use std::collections::HashMap;
// http://astropixels.com/ephemeris/soleq2001.html
const SOLSTICE_TABLE: &'static str = "
2001 Mar 20 13:31 Jun 21 07:38 Sep 22 23:05 Dec 21 19:22
2002 Mar 20 19:16 Jun 21 13:25 Sep 23 04:56 Dec 22 01:15
2003 Mar 21 01:00 Jun 21 19:11 Sep 23 10:47 Dec 22 07:04
2004 Mar 20 06:49 Jun 21 00:57 Sep 22 16:30 Dec 21 12:42
2005 Mar 20 12:34 Jun 21 06:46 Sep 22 22:23 Dec 21 18:35
2006 Mar 20 18:25 Jun 21 12:26 Sep 23 04:04 Dec 22 00:22
2007 Mar 21 00:07 Jun 21 18:06 Sep 23 09:51 Dec 22 06:08
2008 Mar 20 05:49 Jun 21 00:00 Sep 22 15:45 Dec 21 12:04
2009 Mar 20 11:44 Jun 21 05:45 Sep 22 21:18 Dec 21 17:47
2010 Mar 20 17:32 Jun 21 11:28 Sep 23 03:09 Dec 21 23:38
2011 Mar 20 23:21 Jun 21 17:16 Sep 23 09:05 Dec 22 05:30
2012 Mar 20 05:15 Jun 20 23:08 Sep 22 14:49 Dec 21 11:12
2013 Mar 20 11:02 Jun 21 05:04 Sep 22 20:44 Dec 21 17:11
2014 Mar 20 16:57 Jun 21 10:52 Sep 23 02:30 Dec 21 23:03
2015 Mar 20 22:45 Jun 21 16:38 Sep 23 08:20 Dec 22 04:48
2016 Mar 20 04:31 Jun 20 22:35 Sep 22 14:21 Dec 21 10:45
2017 Mar 20 10:29 Jun 21 04:25 Sep 22 20:02 Dec 21 16:29
2018 Mar 20 16:15 Jun 21 10:07 Sep 23 01:54 Dec 21 22:22
2019 Mar 20 21:58 Jun 21 15:54 Sep 23 07:50 Dec 22 04:19
2020 Mar 20 03:50 Jun 20 21:43 Sep 22 13:31 Dec 21 10:03
2021 Mar 20 09:37 Jun 21 03:32 Sep 22 19:21 Dec 21 15:59
2022 Mar 20 15:33 Jun 21 09:14 Sep 23 01:04 Dec 21 21:48
2023 Mar 20 21:25 Jun 21 14:58 Sep 23 06:50 Dec 22 03:28
2024 Mar 20 03:07 Jun 20 20:51 Sep 22 12:44 Dec 21 09:20
2025 Mar 20 09:02 Jun 21 02:42 Sep 22 18:20 Dec 21 15:03
2026 Mar 20 14:46 Jun 21 08:25 Sep 23 00:06 Dec 21 20:50
2027 Mar 20 20:25 Jun 21 14:11 Sep 23 06:02 Dec 22 02:43
2028 Mar 20 02:17 Jun 20 20:02 Sep 22 11:45 Dec 21 08:20
2029 Mar 20 08:01 Jun 21 01:48 Sep 22 17:37 Dec 21 14:14
2030 Mar 20 13:51 Jun 21 07:31 Sep 22 23:27 Dec 21 20:09
2031 Mar 20 19:41 Jun 21 13:17 Sep 23 05:15 Dec 22 01:56
2032 Mar 20 01:23 Jun 20 19:09 Sep 22 11:11 Dec 21 07:57
2033 Mar 20 07:23 Jun 21 01:01 Sep 22 16:52 Dec 21 13:45
2034 Mar 20 13:18 Jun 21 06:45 Sep 22 22:41 Dec 21 19:35
2035 Mar 20 19:03 Jun 21 12:33 Sep 23 04:39 Dec 22 01:31
2036 Mar 20 01:02 Jun 20 18:31 Sep 22 10:23 Dec 21 07:12
2037 Mar 20 06:50 Jun 21 00:22 Sep 22 16:13 Dec 21 13:08
2038 Mar 20 12:40 Jun 21 06:09 Sep 22 22:02 Dec 21 19:01
2039 Mar 20 18:32 Jun 21 11:58 Sep 23 03:50 Dec 22 00:41
2040 Mar 20 00:11 Jun 20 17:46 Sep 22 09:44 Dec 21 06:33
2041 Mar 20 06:07 Jun 20 23:37 Sep 22 15:27 Dec 21 12:19
2042 Mar 20 11:53 Jun 21 05:16 Sep 22 21:11 Dec 21 18:04
2043 Mar 20 17:29 Jun 21 10:59 Sep 23 03:07 Dec 22 00:02
2044 Mar 19 23:20 Jun 20 16:50 Sep 22 08:47 Dec 21 05:43
2045 Mar 20 05:08 Jun 20 22:34 Sep 22 14:33 Dec 21 11:36
2046 Mar 20 10:58 Jun 21 04:15 Sep 22 20:22 Dec 21 17:28
2047 Mar 20 16:52 Jun 21 10:02 Sep 23 02:07 Dec 21 23:07
2048 Mar 19 22:34 Jun 20 15:54 Sep 22 08:01 Dec 21 05:02
2049 Mar 20 04:28 Jun 20 21:47 Sep 22 13:42 Dec 21 10:51
2050 Mar 20 10:20 Jun 21 03:33 Sep 22 19:29 Dec 21 16:39
";
#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
pub struct YearlyEvents {
pub year: i32,
pub spring_equinox: chrono::DateTime<chrono::Utc>,
pub summer_solstice: chrono::DateTime<chrono::Utc>,
pub autumn_equinox: chrono::DateTime<chrono::Utc>,
pub winter_solstice: chrono::DateTime<chrono::Utc>,
}
#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
pub enum Event {
SpringEquinox(chrono::DateTime<chrono::Utc>),
SummerSolstice(chrono::DateTime<chrono::Utc>),
AutumnEquinox(chrono::DateTime<chrono::Utc>),
WinterSolstice(chrono::DateTime<chrono::Utc>),
}
impl Event {
pub fn date(&self) -> chrono::DateTime<chrono::Utc> {
match *self {
Event::SpringEquinox(d) => d,
Event::SummerSolstice(d) => d,
Event::AutumnEquinox(d) => d,
Event::WinterSolstice(d) => d,
}
}
}
fn parse_text<'a>(
year: &str,
iter: impl Iterator<Item = &'a str>,
) -> chrono::DateTime<chrono::Utc> {
let partoj = iter.collect::<Vec<&str>>();
let p = format!("{} {} {} {}", year, partoj[0], partoj[1], partoj[2]);
chrono::Utc.datetime_from_str(&p, "%Y %b %d %H:%M").unwrap()
}
fn parse_line(year: &str, resto: &[&str]) -> YearlyEvents {
let spring = parse_text(year, resto.iter().take(3).cloned());
let summer = parse_text(year, resto.iter().skip(3).take(3).cloned());
let autumn = parse_text(year, resto.iter().skip(6).take(3).cloned());
let winter = parse_text(year, resto.iter().skip(9).take(3).cloned());
YearlyEvents {
year: year.parse::<i32>().unwrap(),
spring_equinox: spring,
summer_solstice: summer,
autumn_equinox: autumn,
winter_solstice: winter,
}
}
fn parse_table() -> Vec<Option<YearlyEvents>> {
SOLSTICE_TABLE
.lines()
.map(|line| {
match line
.split(" ")
.filter(|elem| !elem.is_empty())
.collect::<Vec<&str>>()
.as_slice()
{
[year, rest @ ..] => Some(parse_line(year, rest)),
_ => None,
}
})
.collect()
}
pub struct Solstices(HashMap<i32, YearlyEvents>);
impl Solstices {
pub fn get_events(&self, year: i32) -> Option<YearlyEvents> {
self.0.get(&year).map(|c| c.clone())
}
pub fn next_event(&self, date: chrono::DateTime<chrono::Utc>) -> Option<Event> {
let yearly_events = self.0.get(&date.year());
match yearly_events {
Some(yearly_events) => {
if date <= yearly_events.spring_equinox {
Some(Event::SpringEquinox(yearly_events.spring_equinox.clone()))
} else if date <= yearly_events.summer_solstice {
Some(Event::SummerSolstice(yearly_events.summer_solstice.clone()))
} else if date <= yearly_events.autumn_equinox {
Some(Event::AutumnEquinox(yearly_events.autumn_equinox.clone()))
} else if date <= yearly_events.winter_solstice {
Some(Event::WinterSolstice(yearly_events.winter_solstice.clone()))
} else {
self.0
.get(&(date.year() + 1))
.map(|events| Event::SpringEquinox(events.spring_equinox.clone()))
}
}
None => None,
}
}
}
impl From<Vec<Option<YearlyEvents>>> for Solstices {
fn from(entry: Vec<Option<YearlyEvents>>) -> Self {
Solstices(entry.iter().fold(HashMap::new(), |mut m, record| {
match record {
Some(record) => {
m.insert(record.year, record.clone());
}
None => (),
}
m
}))
}
}
lazy_static! {
pub static ref EVENTOJ: Solstices = Solstices::from(parse_table());
}