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//! Defines the `TimeManager` trait.
use uci::SetOption;
use ttable::Variation;
use search::*;
/// Describes the remaining time on the clocks.
#[derive(Clone, Debug)]
pub struct RemainingTime {
/// The remaining time in milliseconds for white.
pub white_millis: u64,
/// The remaining time in milliseconds for black.
pub black_millis: u64,
/// The number of milliseconds with which white's remaining time
/// is incremented on each move.
pub winc_millis: u64,
/// The number of milliseconds with which black's remaining time
/// is incremented on each move.
pub binc_millis: u64,
/// The number of moves to the next time control.
///
/// Can not be zero.
pub movestogo: Option<u64>,
}
/// A trait for deciding when the search must be terminated and the
/// best move played.
///
/// To implement your own time management logic, you must define a
/// type that implements the `TimeManager` trait.
pub trait TimeManager<T: DeepeningSearch<ReportData = Vec<Variation>>>
: SetOption {
/// Creates a new instance.
///
/// * `position` gives the current position.
///
/// * `time` gives the remaining time on the clocks.
fn new(position: &T::SearchNode, time: &RemainingTime) -> Self;
/// Returns `true` if the search must be terminated and the best
/// move played.
///
/// * `search_instance` is a mutable reference to the currently
/// running search instance. The time manager should be careful
/// when calling methods on the currently running search
/// instance, so as not to disturb its normal working. In
/// particular, `start_search` and `try_recv_report` methods
/// must not be called, and a `"TERMINATE"` message must not be
/// sent.
///
/// * `report`, when supplied, gives a reference to an incoming
/// search progress report. `must_play` will be called exactly
/// once for each progress report generated by the search,
/// following the order in which the reports have been
/// generated.
fn must_play(&mut self,
search_instance: &mut T,
report: Option<&SearchReport<Vec<Variation>>>)
-> bool;
}