//! Clock injection.
//!
//! `heph-core` never reads the ambient wall clock (tech-spec §2): the current
//! time is always supplied through a [`Clock`]. This keeps ranking and
//! recurrence deterministic and testable. The daemon wires in a real
//! system clock; tests wire in a [`FixedClock`].

/// Source of the current time, in epoch milliseconds.
pub trait Clock: Send + Sync {
    /// Current time as epoch milliseconds.
    fn now_ms(&self) -> i64;
}

/// A clock pinned to a fixed instant — for deterministic tests.
#[derive(Debug, Clone, Copy)]
pub struct FixedClock(pub i64);

impl Clock for FixedClock {
    fn now_ms(&self) -> i64 {
        self.0
    }
}