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use crate::{
Interval,
job_schedule::{Repeating, WithSchedule},
timeprovider::TimeProvider
};
use time::{OffsetDateTime, Time};
/// This trait provides an abstraction over [`SyncJob`](crate::SyncJob) and [`AsyncJob`](crate::AsyncJob), covering all the methods relating to scheduling, rather than execution.
pub trait Job<TP: TimeProvider>: WithSchedule<TP> + Sized {
/// Specify the time of day when a task should run, e.g.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # use time::Time;
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.day())
/// .at("14:32")
/// .run(|| println!("Tea time!"));
/// scheduler
/// .every(Wednesday)
/// .at("6:32:21 PM")
/// .run(|| println!("Writing examples is hard"));
/// ```
///
/// Times can be specified using strings, with or without seconds, and in either 24-hour or 12-hour time.
/// They can also be any other type that implements `TryInto<ClokwerkTime>`, which includes [`time::Time`].
/// This method will panic if TryInto fails, e.g. because the time string could not be parsed.
/// If the value comes from an untrusted source, e.g. user input, [`Job::try_at`] will return a result instead.
///
/// This method is mutually exclusive with [`Job::plus()`].
fn at(&mut self, time: &str) -> &mut Self {
self.schedule_mut()
.try_at(time)
.expect("Could not convert value into a time");
self
}
/// Identical to [`Job::at`] except that it returns a Result instead of panicking if the conversion failed.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.day())
/// .try_at("14:32")?
/// .run(|| println!("Tea time!"));
/// # Ok::<(), time::error::Parse>(())
/// ```
///
/// Times can be specified with or without seconds, and in either 24-hour or 12-hour time.
/// Mutually exclusive with [`Job::plus()`].
fn try_at(&mut self, time: &str) -> Result<&mut Self, time::error::Parse> {
self.schedule_mut().try_at(time)?;
Ok(self)
}
/// Similar to [`Job::at`], but it takes a [`time::Time`] instead of a `&str`.
/// Because it doesn't need to parse a string, this method will always succeed.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # use time::Time;
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(Workday)
/// .at_time(Time::from_hms(23, 42, 16).unwrap())
/// .run(|| println!("Also works with Time"));
/// ```
fn at_time(&mut self, time: Time) -> &mut Self {
self.schedule_mut().at_time(time);
self
}
/// Specifies an offset to when a task should run, e.g.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.day())
/// .plus(6.hours())
/// .plus(13.minutes())
/// .run(|| println!("Time to wake up!"));
/// ```
///
/// Mutually exclusive with [`Job::at()`].
///
/// Note that this normally won't change the frequency with which a task runs, merely its timing.
/// For instance,
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.hour())
/// .plus(30.minutes())
/// .run(|| println!("Time to wake up!"));
/// ```
///
/// will run at 00:30, 01:30, 02:30, etc., rather than at 00:00, 01:30, 03:00, etc.
///
/// If that schedule is desired, then one would need to write
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # let mut scheduler = Scheduler::new();
/// scheduler
/// .every(90.minutes())
/// .run(|| println!("Time to wake up!"));
/// ```
///
/// If the total offset exceeds the base frequency, the resulting behaviour can be unintuitive. For example,
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.hour())
/// .plus(90.minutes())
/// .run(|| println!("Time to wake up!"));
/// ```
///
/// will run at 01:30, 02:30, 03:30, etc., while
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.hour())
/// .plus(125.minutes())
/// .run(|| println!("Time to wake up!"));
/// ```
///
/// will run at 02:05, 04:05, 06:05, etc.
fn plus(&mut self, ival: Interval) -> &mut Self {
self.schedule_mut().plus(ival);
self
}
/// Add an additional scheduling to the task. All schedules will be considered when determining
/// when the task should next run.
fn and_every(&mut self, ival: Interval) -> &mut Self {
self.schedule_mut().and_every(ival);
self
}
/// Execute the job only once. Equivalent to `_.count(1)`.
fn once(&mut self) -> &mut Self {
self.schedule_mut().once();
self
}
/// Execute the job forever. This is the default behaviour.
fn forever(&mut self) -> &mut Self {
self.schedule_mut().forever();
self
}
/// Execute the job only `count` times.
fn count(&mut self, count: usize) -> &mut Self {
self.schedule_mut().count(count);
self
}
/// After running once, run again with the specified interval.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # fn hit_snooze() {}
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(Workday)
/// .at("7:40")
/// .repeating_every(10.minutes())
/// .times(5)
/// .run(|| hit_snooze());
/// ```
///
/// will hit snooze five times every morning, at 7:40, 7:50, 8:00, 8:10 and 8:20.
///
/// Unlike [`Job::at`] and [`Job::plus`],
/// this affects all intervals associated with the job, not just the most recent one.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # fn hit_snooze() {}
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(Workday)
/// .at("7:40")
/// .and_every(Saturday)
/// .at("9:15")
/// .and_every(Sunday)
/// .at("9:15")
/// .repeating_every(10.minutes())
/// .times(5)
/// .run(|| hit_snooze());
/// ```
///
/// hits snooze five times every day, not just Sundays.
///
/// If a job is still repeating, it will ignore otherwise scheduled runs.
///
/// ```rust
/// # use uhrwerk::*;
/// # use uhrwerk::Interval::*;
/// # fn hit_snooze() {}
/// let mut scheduler = Scheduler::new();
/// scheduler
/// .every(1.hour())
/// .repeating_every(45.minutes())
/// .times(3)
/// .run(|| println!("Hello"));
/// ```
///
/// If this is scheduled to run at 6 AM, it will print `Hello` at 6:00, 6:45, and 7:30, and then again at 8:00, 8:45, 9:30, etc.
fn repeating_every(&mut self, interval: Interval) -> Repeating<'_, Self, TP> {
Repeating::new(self, interval)
}
/// Test whether a job is scheduled to run again. This is usually only called by
/// [Scheduler::run_pending()](crate::Scheduler::run_pending).
fn is_pending(&self, now: OffsetDateTime) -> bool {
self.schedule().is_pending(now)
}
}