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use crate::ical;
use std::cmp::Ordering;
use std::ffi::{CStr, CString};
use std::fmt::{Display, Error, Formatter};
use std::ops::{Add, Deref};
use std::str::FromStr;
/// Duration type
///
/// A type that represents a duration of time
#[derive(Clone, Debug)]
pub struct IcalDuration {
duration: ical::icaldurationtype,
}
impl IcalDuration {
/// Convert a number of seconds to an IcalDuration
pub fn from_seconds(seconds: i32) -> IcalDuration {
let duration = unsafe { ical::icaldurationtype_from_int(seconds) };
IcalDuration { duration }
}
/// Get the number of seconds the IcalDuration represents
pub fn to_seconds(&self) -> i32 {
unsafe { ical::icaldurationtype_as_int(self.duration) }
}
pub fn as_string(&self) -> String {
let cstr = unsafe { CStr::from_ptr(ical::icaldurationtype_as_ical_string(self.duration)) };
cstr.to_string_lossy().to_string()
}
}
impl Deref for IcalDuration {
type Target = ical::icaldurationtype;
fn deref(&self) -> &ical::icaldurationtype {
&self.duration
}
}
impl Display for IcalDuration {
fn fmt(&self, f: &mut Formatter) -> Result<(), Error> {
let cstr = unsafe { CStr::from_ptr(ical::icaldurationtype_as_ical_string(self.duration)) };
let string = cstr.to_string_lossy();
write!(f, "{}", string)
}
}
impl FromStr for IcalDuration {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let c_str = CString::new(s).unwrap();
let duration = unsafe {
let duration = ical::icaldurationtype_from_string(c_str.as_ptr());
if ical::icaldurationtype_is_null_duration(duration) == 0 {
Some(duration)
} else {
None
}
};
if let Some(duration) = duration {
Ok(IcalDuration { duration })
} else {
return Err(format!("Could not parse duration {}", s));
}
}
}
impl PartialEq<IcalDuration> for IcalDuration {
fn eq(&self, rhs: &IcalDuration) -> bool {
self.to_seconds() == rhs.to_seconds()
}
}
impl Eq for IcalDuration {}
impl PartialOrd for IcalDuration {
fn partial_cmp(&self, rhs: &IcalDuration) -> Option<Ordering> {
Some(self.cmp(rhs))
}
}
impl Ord for IcalDuration {
fn cmp(&self, rhs: &IcalDuration) -> Ordering {
let left = self.to_seconds();
let right = rhs.to_seconds();
if left == right {
Ordering::Equal
} else if left < right {
Ordering::Less
} else {
Ordering::Greater
}
}
}
impl From<ical::icaldurationtype> for IcalDuration {
fn from(duration: ical::icaldurationtype) -> IcalDuration {
IcalDuration { duration }
}
}
impl From<IcalDuration> for chrono::Duration {
fn from(duration: IcalDuration) -> chrono::Duration {
chrono::Duration::seconds(i64::from(duration.to_seconds()))
}
}
impl From<chrono::Duration> for IcalDuration {
fn from(duration: chrono::Duration) -> IcalDuration {
IcalDuration::from_seconds(duration.num_seconds() as i32)
}
}
impl Add for IcalDuration {
type Output = IcalDuration;
fn add(self, other: IcalDuration) -> IcalDuration {
let seconds = self.to_seconds() + other.to_seconds();
IcalDuration::from_seconds(seconds)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse() {
let duration = "PT86400S".parse::<IcalDuration>().unwrap();
assert_eq!(IcalDuration::from_seconds(24 * 60 * 60), duration);
assert_eq!(86400, duration.to_seconds());
}
#[test]
fn test_parse_fail() {
let duration = "swag".parse::<IcalDuration>();
assert!(duration.is_err());
}
#[test]
fn test_display() {
let duration = IcalDuration::from_seconds(5 * 24 * 60 * 60 + 22 * 60 * 60 + 33 * 60 + 33);
assert_eq!("P5DT22H33M33S", duration.to_string());
}
#[test]
fn test_to_chrono() {
let from_duration =
IcalDuration::from_seconds(5 * 24 * 60 * 60 + 22 * 60 * 60 + 33 * 60 + 33);
let duration: chrono::Duration = from_duration.into();
assert_eq!(
chrono::Duration::seconds(5 * 24 * 60 * 60 + 22 * 60 * 60 + 33 * 60 + 33),
duration
);
}
#[test]
fn test_from_chrono() {
let from_duration =
chrono::Duration::seconds(5 * 24 * 60 * 60 + 22 * 60 * 60 + 33 * 60 + 33);
let duration: IcalDuration = from_duration.into();
assert_eq!(
IcalDuration::from_seconds(5 * 24 * 60 * 60 + 22 * 60 * 60 + 33 * 60 + 33),
duration
);
}
#[test]
fn test_add() {
let fst = IcalDuration::from_seconds(123);
let snd = IcalDuration::from_seconds(4567);
let sum = fst + snd;
assert_eq!(IcalDuration::from_seconds(123 + 4567), sum);
}
#[test]
fn test_cmp() {
let more = IcalDuration::from_seconds(49128);
let less = IcalDuration::from_seconds(5);
assert!(less == less);
assert!(more == more);
assert!(less < more);
assert!(!(more < less));
assert!(!(more == less));
}
}
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