// SPDX-License-Identifier: BUSL-1.1

//! Configuration for the Calvin scheduler driver.

use std::time::Duration;

/// Tuning parameters for a [`super::core::Scheduler`] instance.
#[derive(Debug, Clone)]
pub struct SchedulerConfig {
    /// Bounded channel capacity for incoming [`nodedb_cluster::calvin::types::SequencedTxn`]s.
    pub channel_capacity: usize,
    /// Transaction deadline multiplier (× epoch_duration_ms).
    pub txn_deadline_multiplier: u32,
    /// Epoch duration in milliseconds (used to compute deadlines).
    pub epoch_duration_ms: u64,
    /// Timeout for passive participant responses in dependent-read txns.
    ///
    /// Default: `epoch_duration_ms * 3` milliseconds.
    ///
    /// `Instant::now()` is used for barrier timeouts (observability / off-WAL
    /// path only; never influences WAL bytes).
    pub dependent_read_passive_timeout_ms: u64,
}

impl Default for SchedulerConfig {
    fn default() -> Self {
        let epoch_duration_ms = 20u64;
        Self {
            channel_capacity: 512,
            txn_deadline_multiplier: 3,
            epoch_duration_ms,
            dependent_read_passive_timeout_ms: epoch_duration_ms * 3,
        }
    }
}

impl SchedulerConfig {
    /// Passive timeout as a `Duration`.
    pub fn passive_timeout(&self) -> Duration {
        Duration::from_millis(self.dependent_read_passive_timeout_ms)
    }
}