namespace SQLInsight.Core.Data;

/// <summary>A distribution agent's latest run, from MSdistribution_history.</summary>
/// <param name="RunStatus">1 start, 2 succeed, 3 in progress, 4 idle, 5 retry, 6 fail.</param>
/// <param name="Comment">The agent's message; can name servers and objects.</param>
public sealed record DistributionAgent(string Name, string? PublisherDatabase, int? RunStatus, DateTimeOffset? LastRunAt, long? DeliveryLatencyMs, string? Comment)
{
    public bool Failed => RunStatus is 5 or 6;

    public string StatusText => RunStatus switch
    {
        1 => "startet",
        2 => "lykkedes",
        3 => "i gang",
        4 => "venter (intet at levere)",
        5 => "prøver igen",
        6 => "fejlede",
        _ => "ukendt",
    };
}

/// <summary>Replication as seen from the distributor, every 15 minutes.</summary>
public sealed record ReplicationSnapshot
{
    public required DateTimeOffset CapturedAt { get; init; }

    /// <summary>The instance is a distributor (has a distribution database).</summary>
    public bool IsDistributor { get; init; }

    public string? DistributionDatabase { get; init; }

    /// <summary>Why the distribution database could not be read (typically no SELECT rights); null when it could.</summary>
    public string? Unavailable { get; init; }

    /// <summary>SQL Server's error message when it could not be read. Names the agent's login: sensitive (local UI only).</summary>
    public string? UnavailableDetail { get; init; }

    public IReadOnlyList<DistributionAgent> Agents { get; init; } = [];

    /// <summary>Rows in MSrepl_errors the last 24 hours.</summary>
    public int ErrorsLastDay { get; init; }

    /// <summary>Delivery latency above this (ms) is a finding.</summary>
    public long LatencyThresholdMs { get; init; } = 300_000;
}