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use chrono::prelude::*;
pub fn easter(y: isize, offset: isize) -> Vec<isize> {
let a = y % 19;
let b = (y as f32 / 100_f32).floor() as isize;
let c = y % 100;
let d = (b as f32 / 4_f32).floor() as isize;
let e = b % 4;
let f = ((b + 8) as f32 / 25_f32).floor() as isize;
let g = ((b - f + 1) as f32 / 3_f32).floor() as isize;
let h = (19 * a + b - d - g + 15) % 30;
let i = (c as f32 / 4_f32).floor() as isize;
let k = c % 4;
let l = (32 + 2 * e + 2 * i - h - k) % 7;
let m = ((a + 11 * h + 22 * l) as f32 / 451_f32).floor() as isize;
let month = ((h + l - 7 * m + 114) as f32 / 31_f32).floor() as u32;
let day = ((h + l - 7 * m + 114) % 31) + 1;
let date = Utc
.ymd(y as i32, month, (day + offset) as u32)
.and_hms(0, 0, 0);
let year_start = Utc.ymd(y as i32, 1, 1).and_hms(0, 0, 0);
return vec![
((date.timestamp() - year_start.timestamp()) as f32 / (60 * 60 * 24) as f32).ceil()
as isize,
];
}
#[cfg(test)]
mod test_easter_masks {
use super::*;
#[test]
fn easter_mask() {
let mask = easter(1997, 0);
assert_eq!(mask[0], 88);
let mask = easter(1998, 0);
assert_eq!(mask[0], 101);
let mask = easter(1999, 0);
assert_eq!(mask[0], 93);
let mask = easter(2000, 0);
assert_eq!(mask[0], 113);
}
}
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