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use std::fmt;
use std::cmp::Ordering;
#[derive(Debug, Eq, PartialEq, Copy, Clone, Ord, PartialOrd)]
pub enum Zenith {
Golden,
Official,
Civil,
Nautical,
Astronomical
}
impl Zenith {
pub(crate) fn angle(self) -> f64 {
use Zenith::*;
match self {
Golden => 80.0,
Official => 90.8333333333333, Civil => 96.0,
Nautical => 102.0,
Astronomical => 108.0
}
}
}
impl fmt::Display for Zenith {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
Zenith::Golden => write!(f, "golden"),
Zenith::Official => write!(f, "official"),
Zenith::Civil => write!(f, "civil"),
Zenith::Nautical => write!(f, "nautical"),
Zenith::Astronomical => write!(f, "astronomical"),
}
}
}
#[derive(Debug, Eq, PartialEq, Copy, Clone, Ord, PartialOrd)]
pub enum Event {
Sunrise,
Sunset
}
impl Event {
pub(crate) fn hour(self) -> f64 {
use Event::*;
match self {
Sunrise => 6.0,
Sunset => 18.0
}
}
}
impl fmt::Display for Event {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
Event::Sunrise => write!(f, "sunrise"),
Event::Sunset => write!(f, "sunset"),
}
}
}
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub struct SunEvent {
pub zenith: Zenith,
pub event: Event
}
impl SunEvent {
pub const DAWN: SunEvent = SunEvent::new(Zenith::Civil, Event::Sunrise);
pub const DUSK: SunEvent = SunEvent::new(Zenith::Civil, Event::Sunset);
pub const SUNRISE: SunEvent = SunEvent::new(Zenith::Official, Event::Sunrise);
pub const SUNSET: SunEvent = SunEvent::new(Zenith::Official, Event::Sunset);
pub const fn new(zenith: Zenith, event: Event) -> Self {
SunEvent { zenith, event }
}
pub fn is_sunrise(self) -> bool {
use Event::*;
match self.event {
Sunrise => true,
Sunset => false
}
}
pub fn is_sunset(self) -> bool {
!self.is_sunrise()
}
}
impl Ord for SunEvent {
fn cmp(&self, other: &Self) -> Ordering {
use Event::*;
match (self.event, other.event) {
(Sunrise, Sunrise) => self.zenith.cmp(&other.zenith).reverse(),
(Sunset, Sunset) => self.zenith.cmp(&other.zenith),
(a, b) => a.cmp(&b)
}
}
}
impl PartialOrd for SunEvent {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl fmt::Display for SunEvent {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use Event::*;
use Zenith::*;
match (self.zenith, self.event) {
(Civil, Sunrise) => write!(f, "dawn"),
(Civil, Sunset) => write!(f, "dusk"),
(Official, Sunrise) => write!(f, "sunrise"),
(Official, Sunset) => write!(f, "sunset"),
(z, e) => write!(f, "{} {}", z, e)
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn sunrise_should_sort_before_sunset() {
use Event::*;
let mut events = vec![Sunrise, Sunset, Sunrise, Sunset, Sunset, Sunset, Sunrise];
events.sort();
assert_eq!(events, vec![Sunrise, Sunrise, Sunrise, Sunset, Sunset, Sunset, Sunset]);
}
#[test]
fn zenith_should_sort_in_order_of_angle() {
use Zenith::*;
let mut zeniths = vec![Golden, Official, Golden, Civil, Astronomical, Nautical, Astronomical, Official];
zeniths.sort();
assert_eq!(zeniths, vec![Golden, Golden, Official, Official, Civil, Nautical, Astronomical, Astronomical]);
}
#[test]
fn sun_event_should_sort_in_order_of_occurence() {
let mut events = vec![SunEvent::DAWN, SunEvent::DUSK, SunEvent::SUNRISE, SunEvent::SUNSET];
events.sort();
assert_eq!(events, vec![SunEvent::DAWN, SunEvent::SUNRISE, SunEvent::SUNSET, SunEvent::DUSK]);
}
}