using ScadaLink.Commons.Messages.Health;

namespace ScadaLink.HealthMonitoring;

/// <summary>
/// In-memory state for a single site's health, stored by the central aggregator.
/// </summary>
public class SiteHealthState
{
    public required string SiteId { get; init; }
    public SiteHealthReport LatestReport { get; set; } = null!;

    /// <summary>
    /// Time the latest full <see cref="SiteHealthReport"/> was processed.
    /// Used by the UI to surface report staleness during failover.
    /// </summary>
    public DateTimeOffset LastReportReceivedAt { get; set; }

    /// <summary>
    /// Time the most recent signal of any kind (full report OR ~5s heartbeat)
    /// was received. Drives offline detection — heartbeats from the standby
    /// keep the site marked online even when the active node is unable to
    /// produce a report (mid-failover, brief stalls).
    /// </summary>
    public DateTimeOffset LastHeartbeatAt { get; set; }

    public long LastSequenceNumber { get; set; }
    public bool IsOnline { get; set; }
}