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use chrono::{Duration, Local, NaiveDate};
use cursive::direction::Absolute;
#[derive(Debug, Copy, Clone)]
pub struct Cursor(pub NaiveDate);
impl std::default::Default for Cursor {
fn default() -> Self {
Cursor::new()
}
}
impl Cursor {
pub fn new() -> Self {
Cursor {
0: Local::now().naive_local().date(),
}
}
pub fn small_seek(&mut self, d: Absolute) {
let today = Local::now().naive_local().date();
let cursor = self.0;
match d {
Absolute::Right => {
// forward by 1 day
let next = cursor.succ_opt().unwrap_or(cursor);
if next <= today {
self.0 = next;
}
}
Absolute::Left => {
// backward by 1 day
// assumes an infinite past
self.0 = cursor.pred_opt().unwrap_or(cursor);
}
Absolute::Down => {
// forward by 1 week
let next = cursor.checked_add_signed(Duration::weeks(1)).unwrap();
if next <= today {
self.0 = next;
}
}
Absolute::Up => {
// backward by 1 week
// assumes an infinite past
let next = cursor.checked_sub_signed(Duration::weeks(1)).unwrap();
self.0 = next;
}
Absolute::None => {}
}
}
fn long_seek(&mut self, offset: Duration) {
let cursor = self.0;
let today = Local::now().naive_local().date();
let next = cursor.checked_add_signed(offset).unwrap_or(cursor);
if next <= today {
self.0 = next;
} else {
self.0 = today;
}
}
pub fn month_forward(&mut self) {
self.long_seek(Duration::weeks(4));
}
pub fn month_backward(&mut self) {
self.long_seek(Duration::weeks(-4));
}
pub fn reset(&mut self) {
self.0 = Local::now().naive_local().date();
}
}
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