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use std::fmt;
use std::str::FromStr;
use std::ops::Add;
use std::collections::HashMap;
use chrono::{Duration, Weekday};
use date::Date;
use event::{Event, End};
use errors::EventError;
pub type Byday = HashMap<Weekday, Vec<i32>>;
#[derive(Debug)]
pub struct Periodic {
pub event: Event,
pub freq: Freq,
pub interval: i64,
pub count: Option<i64>,
pub until: Option<Date>,
pub byday: Option<Byday>,
pub bysetpos: i32,
pub wkst: Weekday,
}
#[derive(Debug)]
pub enum Freq {
Secondly,
Minutely,
Hourly,
Daily,
Weekly,
Monthly,
Yearly,
}
impl Periodic {
pub fn new() -> Self {
Self {
event: Event::new(),
freq: Freq::Secondly,
interval: 1,
count: None,
until: None,
byday: None,
bysetpos: 0,
wkst: Weekday::Mon,
}
}
pub fn set_param(&mut self, param: &str, value: &str) -> Result<(), EventError> {
match param {
"FREQ" => self.freq = value.parse()?,
"INTERVAL" => self.interval = value.parse()?,
"COUNT" => self.count = Some(value.parse()?),
"UNTIL" => self.until = Some(Date::parse(&value, "")?),
"BYDAY" => self.byday = Some(parse_byday(value)?),
"BYSETPOS" => self.bysetpos = value.parse()?,
"WKST" => self.wkst = parse_weekday(value)?,
_ => (),
}
Ok(())
}
pub fn iter<'a>(&'a self) -> Iter<'a> {
Iter {
periodic: self,
start: self.event.start,
end: self.event.end_date(),
count: 0,
}
}
}
pub struct Iter<'a> {
periodic: &'a Periodic,
start: Date,
end: Date,
count: i64,
}
impl<'a> Iterator for Iter<'a> {
type Item = Event;
fn next(&mut self) -> Option<Self::Item> {
let p = self.periodic;
if (p.until.is_some() && self.start <= p.until.unwrap()) ||
(p.count.is_some() && self.count >= p.count.unwrap())
{
return None;
}
let mut event = p.event.clone();
event.start = self.start;
event.end = End::Date(self.end);
let duration = self.next_duration(self.start);
self.start = self.start + duration;
self.end = self.end + duration;
self.count += 1;
Some(event)
}
}
impl<'a> Iter<'a> {
fn next_duration(&self, date: Date) -> Duration {
let p = self.periodic;
match p.freq {
Freq::Secondly => Duration::seconds(p.interval),
Freq::Minutely => Duration::minutes(p.interval),
Freq::Hourly => Duration::hours(p.interval),
Freq::Daily => Duration::days(p.interval),
Freq::Weekly => {
match &p.byday {
None => Duration::weeks(p.interval),
Some(byday) => {
let mut weekday = date.weekday().succ();
let mut days = 1;
if weekday == p.wkst {
days += 7 * (p.interval - 1);
}
while !byday.contains_key(&weekday) {
weekday = weekday.succ();
days += 1;
if weekday == p.wkst {
days += 7 * (p.interval - 1);
}
}
Duration::days(days)
}
}
}
Freq::Monthly => {
match &p.byday {
Some(byday) => {
let mut next = date;
if p.interval > 1 {
next = next.with_day(1).unwrap();
for _ in 1..p.interval {
next = next.add(Duration::days(next.days_in_month().into()));
}
}
loop {
next = next.add(Duration::days(1));
let (week, neg_week) = next.week_of_month();
match byday.get(&next.weekday()) {
Some(occurrences) =>
if p.bysetpos == week || p.bysetpos == neg_week
|| occurrences.contains(&0)
|| occurrences.contains(&week) || occurrences.contains(&neg_week) {
break;
}
None => {}
};
};
next - date
}
None => {
let new_date = if date.month() == 12 {
date.with_month(1)
.unwrap()
.with_year(date.year() + 1)
.unwrap()
} else {
date.with_month(date.month() + 1).unwrap()
};
new_date - date
}
}
}
// TODO: byday...
Freq::Yearly => date.with_year(date.year() + 1).unwrap() - date,
}
}
}
impl fmt::Display for Periodic {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.freq)?;
if self.interval != 1 {
write!(f, "({})", self.interval)?;
}
write!(f, ": {}", self.event)?;
Ok(())
}
}
impl FromStr for Freq {
type Err = EventError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"SECONDLY" => Ok(Freq::Secondly),
"MINUTELY" => Ok(Freq::Minutely),
"HOURLY" => Ok(Freq::Hourly),
"DAILY" => Ok(Freq::Daily),
"WEEKLY" => Ok(Freq::Weekly),
"MONTHLY" => Ok(Freq::Monthly),
"YEARLY" => Ok(Freq::Yearly),
_ => Err(EventError::FreqError),
}
}
}
fn parse_byday(s: &str) -> Result<Byday, EventError> {
let mut byday = Byday::new();
for v in s.split(",") {
let weekday = parse_weekday(&v[v.len() - 2..])?;
let occurrence = if v.len() > 2 {
v[..v.len() - 2].parse()?
} else {
0
};
match byday.get_mut(&weekday) {
Some(occurrences) => occurrences.push(occurrence),
None => {
byday.insert(weekday, vec![occurrence]);
}
};
}
Ok(byday)
}
fn parse_weekday(s: &str) -> Result<Weekday, EventError> {
match s {
"MO" => Ok(Weekday::Mon),
"TU" => Ok(Weekday::Tue),
"WE" => Ok(Weekday::Wed),
"TH" => Ok(Weekday::Thu),
"FR" => Ok(Weekday::Fri),
"SA" => Ok(Weekday::Sat),
"SU" => Ok(Weekday::Sun),
_ => Err(EventError::BydayError),
}
}
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