import type { PlayerCapacityObservation } from '../../server-capacity.js';
import { monitoringStatus } from './health-observations.js';
import { MonitoringSnapshot } from './monitoring-snapshot.js';

/** Read only the accepted, current-instance sample; never dispatch a probe. */
export function observedPlayerCapacity(
    server: string,
    snapshot: MonitoringSnapshot
): PlayerCapacityObservation {
    const game = monitoringStatus(server, snapshot)?.game;
    const capacity = game?.result.ok ? game.result.status.capacity : null;
    return typeof capacity === 'number' && Number.isSafeInteger(capacity) && capacity > 0
        ? { capacity, capacity_observed_at: game!.observedAt }
        : { capacity: null, capacity_observed_at: null };
}

/** One joined identity read for a fleet, or a single server on a detail route. */
export function playerCapacityReader(serverName?: string) {
    const snapshot = new MonitoringSnapshot(serverName);
    return (server: string) => observedPlayerCapacity(server, snapshot);
}