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use crate::options::*;
use crate::iter::yearinfo::pymod;
#[derive(Debug)]
pub struct MonthInfo {
pub lastyear: isize,
pub lastmonth: usize,
pub nwdaymask: Vec<isize>,
}
pub fn rebuild_month(
year: isize,
month: usize,
yearlen: usize,
mrange: &Vec<usize>,
wdaymask: &Vec<usize>,
options: &ParsedOptions,
) -> MonthInfo {
let mut result = MonthInfo {
lastyear: year,
lastmonth: month,
nwdaymask: vec![],
};
let mut ranges: Vec<(isize, isize)> = vec![];
if options.freq == Frequenzy::Yearly {
if options.bymonth.is_empty() {
ranges = vec![(0, yearlen as isize)];
} else {
for j in 0..options.bymonth.len() {
let m = options.bymonth[j];
ranges.push((mrange[m - 1] as isize, mrange[m] as isize))
}
}
} else if options.freq == Frequenzy::Monthly {
ranges.push((mrange[month - 1] as isize, mrange[month] as isize));
}
if ranges.is_empty() {
return result;
}
// Weekly frequency won't get here, so we may not
// care about cross-year weekly periods.
result.nwdaymask = vec![0; yearlen];
for j in 0..ranges.len() {
let rang = ranges[j];
let first = rang.0;
let last = rang.1 - 1;
for k in 0..options.bynweekday.len() {
let mut i: isize;
let wday = options.bynweekday[k][0];
let n = options.bynweekday[k][1];
if n < 0 {
i = last + (n + 1) * 7;
i -= pymod(wdaymask[i as usize] as isize - wday, 7);
} else {
i = first + (n - 1) * 7;
i += pymod(7 - wdaymask[i as usize] as isize + wday, 7);
}
if first <= i && i <= last {
result.nwdaymask[i as usize] = 1;
}
}
}
result
}
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