using ZB.MOM.WW.ScadaBridge.Commons.Types.Alarms;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;

namespace ZB.MOM.WW.ScadaBridge.Commons.Messages.Streaming;

public record AlarmStateChanged(
    string InstanceUniqueName,
    string AlarmName,
    AlarmState State,
    int Priority,
    DateTimeOffset Timestamp) : ISiteStreamEvent
{
    /// <summary>
    /// Severity level when <see cref="State"/> is <see cref="AlarmState.Active"/>.
    /// Always <see cref="AlarmLevel.None"/> for binary trigger types
    /// (ValueMatch, RangeViolation, RateOfChange); set by the HiLo trigger
    /// type to one of Low/LowLow/High/HighHigh based on the crossed setpoint.
    /// Added as an init-property so existing positional constructors still
    /// work — message contract evolves additively.
    /// </summary>
    public AlarmLevel Level { get; init; } = AlarmLevel.None;

    /// <summary>
    /// Optional per-band operator message (e.g., "Coolant critically low —
    /// shut down"). Set by HiLo triggers when the per-setpoint message is
    /// configured; otherwise empty. Notification routing and UI tooltips may
    /// surface this to operators.
    /// </summary>
    public string Message { get; init; } = string.Empty;

    /// <summary>
    /// Whether this alarm is computed at the site or mirrored from a native
    /// source. Defaults to <see cref="AlarmKind.Computed"/>.
    /// </summary>
    public AlarmKind Kind { get; init; } = AlarmKind.Computed;

    private AlarmConditionState? _condition;

    /// <summary>
    /// Unified A&amp;C-style condition (active/acked/shelved/suppressed + severity).
    /// When not explicitly set, defaults to a computed mapping of
    /// <see cref="State"/> + <see cref="Priority"/> so existing callers and
    /// computed alarms carry a correct condition without extra work.
    /// </summary>
    public AlarmConditionState Condition
    {
        get => _condition ?? AlarmConditionStateFactory.ForComputed(State, Priority);
        init => _condition = value;
    }

    /// <summary>Native per-condition key (e.g. "Tank01.Level.HiHi"); empty for computed alarms.</summary>
    public string SourceReference { get; init; } = string.Empty;

    /// <summary>Native alarm type name (e.g. "AnalogLimitAlarm.HiHi"); empty for computed alarms.</summary>
    public string AlarmTypeName { get; init; } = string.Empty;

    /// <summary>Native alarm category/taxonomy; empty for computed alarms.</summary>
    public string Category { get; init; } = string.Empty;

    /// <summary>Operator who acknowledged at the source (display-only); empty otherwise.</summary>
    public string OperatorUser { get; init; } = string.Empty;

    /// <summary>Operator comment captured at the source (display-only); empty otherwise.</summary>
    public string OperatorComment { get; init; } = string.Empty;

    /// <summary>When the native condition originally became active, if known.</summary>
    public DateTimeOffset? OriginalRaiseTime { get; init; }

    /// <summary>Current source value (display-only); empty for computed alarms.</summary>
    public string CurrentValue { get; init; } = string.Empty;

    /// <summary>Limit/threshold value for native limit alarms (display-only); empty otherwise.</summary>
    public string LimitValue { get; init; } = string.Empty;
}