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use crate::SlotClock;
pub use lighthouse_metrics::*;
use types::{EthSpec, Slot};

lazy_static! {
    pub static ref PRESENT_SLOT: Result<IntGauge> =
        try_create_int_gauge("slotclock_present_slot", "The present wall-clock slot");
    pub static ref PRESENT_EPOCH: Result<IntGauge> =
        try_create_int_gauge("slotclock_present_epoch", "The present wall-clock epoch");
    pub static ref SLOTS_PER_EPOCH: Result<IntGauge> =
        try_create_int_gauge("slotclock_slots_per_epoch", "Slots per epoch (constant)");
    pub static ref MILLISECONDS_PER_SLOT: Result<IntGauge> = try_create_int_gauge(
        "slotclock_slot_time_milliseconds",
        "The duration in milliseconds between each slot"
    );
}

/// Update the global metrics `DEFAULT_REGISTRY` with info from the slot clock.
pub fn scrape_for_metrics<T: EthSpec, U: SlotClock>(clock: &U) {
    let present_slot = match clock.now() {
        Some(slot) => slot,
        _ => Slot::new(0),
    };

    set_gauge(&PRESENT_SLOT, present_slot.as_u64() as i64);
    set_gauge(
        &PRESENT_EPOCH,
        present_slot.epoch(T::slots_per_epoch()).as_u64() as i64,
    );
    set_gauge(&SLOTS_PER_EPOCH, T::slots_per_epoch() as i64);
    set_gauge(
        &MILLISECONDS_PER_SLOT,
        clock.slot_duration().as_millis() as i64,
    );
}