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//! The [`AgentRoleStore`] trait -- the cost counter of each agent role,
//! shared by every worker.
use Decimal;
use Uuid;
use crate;
use crateStoreFuture;
/// Async storage for the cost counters of agent roles.
///
/// Both backends share these semantics:
///
/// - **Reserve** upserts the role by name and, under its row lock, decides
/// the admission. The stored code cap and period follow the request
/// (display only). The counter rolls over (`spent_usd = 0`) when the
/// request's `period_start` is newer than the stored one; an older
/// `period_start` (a worker clock behind) never resets it, nor does a
/// different period alone (two worker versions declaring different periods
/// for one role would otherwise wipe each other's spend).
/// Reserving again with an existing `reservation_id` returns `Admitted` with
/// the amount held. The enforced cap is the lower of the request's code cap
/// and the operator cap. Without a cap the step is admitted and holds its
/// budget (zero when it has none). When `spent + reserved >= cap` the step
/// is `Refused`. Otherwise it holds its budget, or all the remaining room
/// (`cap - spent - reserved`) when it declares none. Reservations expired
/// for more than a day are purged.
/// - **Settle** deletes the reservation and, when it existed, applies the same
/// rollover rule with the settlement's period, then adds the cost. An
/// unknown reservation is already settled: nothing changes.
/// - **Read** (`get`, `list`) reports in `reserved_usd` the live reservations
/// only (`expires_at` in the future).
///
/// # Examples
///
/// ```no_run
/// use chrono::Utc;
/// use ironflow_store::prelude::*;
/// use rust_decimal::Decimal;
/// use uuid::Uuid;
///
/// # async fn example() -> Result<(), ironflow_store::error::StoreError> {
/// let store = InMemoryStore::new();
/// let reservation_id = Uuid::now_v7();
/// let admission = store
/// .reserve_agent_role_cost(RoleCostReservationRequest {
/// reservation_id,
/// role: "reviewer".to_string(),
/// code_cap_usd: Some(Decimal::TEN),
/// period: "month".to_string(),
/// period_start: Utc::now(),
/// budget_usd: Some(Decimal::ONE),
/// ttl_secs: 600,
/// })
/// .await?;
/// assert!(matches!(admission, RoleCostAdmission::Admitted { .. }));
/// store
/// .settle_agent_role_cost(RoleCostSettlement {
/// reservation_id,
/// period: "month".to_string(),
/// period_start: Utc::now(),
/// cost_usd: Decimal::new(5, 1),
/// })
/// .await?;
/// # Ok(())
/// # }
/// ```