using CommunityToolkit.Mvvm.ComponentModel;

namespace ZB.MOM.WW.OtOpcUa.Client.UI.ViewModels;

/// <summary>
///     Represents a single alarm event row.
/// </summary>
public class AlarmEventViewModel : ObservableObject
{
    /// <summary>
    /// Creates an alarm row model from an OPC UA condition event so the alarms tab can display and acknowledge it.
    /// </summary>
    /// <param name="sourceName">The source object or variable name associated with the alarm.</param>
    /// <param name="conditionName">The OPC UA condition name reported by the server.</param>
    /// <param name="severity">The alarm severity value presented to the operator.</param>
    /// <param name="message">The alarm message text shown in the UI.</param>
    /// <param name="retain">Indicates whether the server is retaining the alarm condition.</param>
    /// <param name="activeState">Indicates whether the alarm is currently active.</param>
    /// <param name="ackedState">Indicates whether the alarm has already been acknowledged.</param>
    /// <param name="time">The event timestamp associated with the alarm state.</param>
    /// <param name="eventId">The OPC UA event identifier used for acknowledgment calls.</param>
    /// <param name="conditionNodeId">The condition node identifier used when acknowledging the alarm.</param>
    public AlarmEventViewModel(
        string sourceName,
        string conditionName,
        ushort severity,
        string message,
        bool retain,
        bool activeState,
        bool ackedState,
        DateTime time,
        byte[]? eventId = null,
        string? conditionNodeId = null)
    {
        SourceName = sourceName;
        ConditionName = conditionName;
        Severity = severity;
        Message = message;
        Retain = retain;
        ActiveState = activeState;
        AckedState = ackedState;
        Time = time;
        EventId = eventId;
        ConditionNodeId = conditionNodeId;
    }

    /// <summary>
    /// Gets the source object or variable name associated with the alarm.
    /// </summary>
    public string SourceName { get; }

    /// <summary>
    /// Gets the OPC UA condition name reported for the alarm event.
    /// </summary>
    public string ConditionName { get; }

    /// <summary>
    /// Gets the severity value shown to the operator.
    /// </summary>
    public ushort Severity { get; }

    /// <summary>
    /// Gets the alarm message text shown in the UI.
    /// </summary>
    public string Message { get; }

    /// <summary>
    /// Gets a value indicating whether the server is retaining the condition.
    /// </summary>
    public bool Retain { get; }

    /// <summary>
    /// Gets a value indicating whether the alarm is currently active.
    /// </summary>
    public bool ActiveState { get; }

    /// <summary>
    /// Gets a value indicating whether the alarm has already been acknowledged.
    /// </summary>
    public bool AckedState { get; }

    /// <summary>
    /// Gets the event timestamp displayed for the alarm row.
    /// </summary>
    public DateTime Time { get; }

    /// <summary>
    /// Gets the OPC UA event identifier needed to acknowledge the alarm.
    /// </summary>
    public byte[]? EventId { get; }

    /// <summary>
    /// Gets the condition node identifier used for acknowledgment method calls.
    /// </summary>
    public string? ConditionNodeId { get; }

    /// <summary>Whether this alarm can be acknowledged (active, not yet acked, has EventId).</summary>
    public bool CanAcknowledge => ActiveState && !AckedState && EventId != null && ConditionNodeId != null;

    /// <summary>Whether this alarm can be shelved/unshelved (has a ConditionNodeId).</summary>
    public bool CanShelve => ConditionNodeId != null;

    /// <summary>Whether this alarm can be confirmed (already acked, has EventId + ConditionNodeId).</summary>
    public bool CanConfirm => AckedState && EventId != null && ConditionNodeId != null;
}
