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use std::cmp::Ordering;
use std::fmt;
use std::str::FromStr;
use chrono;
use chrono::TimeZone;
use chrono_tz::{Tz, UTC};
use errors::EventError;
#[derive(Debug)]
pub struct Event {
pub start: Date,
pub end: Date,
pub summary: String,
pub location: String,
pub description: String,
pub status: Status,
}
#[derive(Debug)]
pub enum Date {
Time(chrono::DateTime<Tz>),
AllDay(chrono::Date<Tz>),
}
#[derive(Debug)]
pub enum Status {
Confirmed,
Tentative,
Canceled,
}
impl Event {
pub fn new() -> Event {
return Event {
summary: "".to_string(),
location: "".to_string(),
description: "".to_string(),
status: Status::Confirmed,
start: Date::Time(UTC.timestamp(0, 0)),
end: Date::Time(UTC.timestamp(0, 0)),
};
}
}
impl fmt::Display for Event {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}: {}", self.start, self.summary)?;
if !self.location.is_empty() {
write!(f, " ({})", self.location)?;
}
if !self.description.is_empty() {
write!(f, "\n\t{}", self.description)?;
}
Ok(())
}
}
impl Date {
pub fn cmp(&self, other: &Self) -> Ordering {
match *self {
Date::Time(t1) => {
match *other {
Date::Time(t2) => t1.cmp(&t2),
Date::AllDay(d) => cmp_date_time(&d, &t1).reverse(),
}
}
Date::AllDay(d1) => {
match *other {
Date::Time(t) => cmp_date_time(&d1, &t),
Date::AllDay(d2) => d1.cmp(&d2),
}
}
}
}
pub fn parse(date: &String, time_zone: &String) -> Result<Self, EventError> {
let tz: Tz = time_zone.parse().unwrap_or(UTC);
let date = match date.find("T") {
Some(_) => {
let time = tz.datetime_from_str(&date, "%Y%m%dT%H%M%S").unwrap_or(
UTC.timestamp(
0,
0,
),
);
Date::Time(time)
}
None => {
Date::AllDay(tz.ymd(
i32::from_str(&date[0..4])?,
u32::from_str(&date[4..6])?,
u32::from_str(&date[6..8])?,
))
}
};
Ok(date)
}
}
impl FromStr for Status {
type Err = EventError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"CONFIRMED" => Ok(Status::Confirmed),
"TENTATIVE" => Ok(Status::Tentative),
"CANCELED" => Ok(Status::Canceled),
_ => Err(EventError::StatusError),
}
}
}
fn cmp_date_time<T: TimeZone>(date: &chrono::Date<T>, time: &chrono::DateTime<T>) -> Ordering {
let d2 = time.date();
if date.eq(&d2) {
return Ordering::Less;
}
date.cmp(&d2)
}
#[cfg(test)]
mod tests {
use super::Date;
use chrono::Datelike;
use chrono::Timelike;
#[test]
fn date_parse_time() {
match Date::parse(&String::from("19361020T120000"), &String::new()).unwrap() {
Date::Time(time) => {
assert_eq!(time.year(), 1936);
assert_eq!(time.hour(), 12);
assert_eq!(time.day(), 20);
}
_ => assert!(true),
}
}
}
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