76 lines
2.9 KiB
C#
76 lines
2.9 KiB
C#
using Microsoft.EntityFrameworkCore;
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public class LocalWarningEvaluator
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{
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private readonly GatewayDbContext _db;
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private readonly ILogger<LocalWarningEvaluator> _logger;
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public LocalWarningEvaluator(GatewayDbContext db, ILogger<LocalWarningEvaluator> logger)
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{
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_db = db;
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_logger = logger;
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}
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public async Task<bool> TryEvaluateAsync(
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Guid observationId, Guid encounterId, Guid patientId,
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string observationCode, decimal value, ThresholdCacheEntry threshold)
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{
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if (!IsWarningBreach(value, threshold)) return false;
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if (IsCriticalBreach(value, threshold)) return false;
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var alertType = AlertTypeExtensions.WarningFor(observationCode);
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var clientAlertId = Guid.NewGuid();
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var triggeredAt = DateTimeOffset.UtcNow;
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var details = BuildWarningDetails(observationCode, value, threshold);
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var exists = await _db.ClinicalAlerts.AnyAsync(a =>
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a.EncounterId == encounterId
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&& a.AlertType == alertType
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&& (a.Status == AlertStatus.Open || a.Status == AlertStatus.Acknowledged));
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if (exists) return false;
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var alert = new LocalClinicalAlert
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{
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Id = Guid.NewGuid(),
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ClientAlertId = clientAlertId,
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EncounterId = encounterId,
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PatientId = patientId,
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ObservationId = observationId,
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AlertType = alertType,
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Severity = AlertSeverity.Warning,
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Details = details,
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Status = AlertStatus.Open,
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TriggeredAt = triggeredAt
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};
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_db.ClinicalAlerts.Add(alert);
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BufferedSyncWriter.Enqueue(_db, BufferedSyncItemType.Alert, new
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{
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clientAlertId,
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encounterId,
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alertType = alertType.ToDbString(),
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severity = AlertSeverity.Warning.ToDbString(),
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details,
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generatedAt = triggeredAt
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}, $"alert:{clientAlertId}", encounterId, triggeredAt);
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_logger.LogInformation(
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"WARNING alert {AlertId} created locally for encounter {EncounterId}",
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alert.Id, encounterId);
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return true;
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}
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private static bool IsWarningBreach(decimal value, ThresholdCacheEntry t) =>
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(t.WarningHigh.HasValue && value > t.WarningHigh.Value) ||
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(t.WarningLow.HasValue && value < t.WarningLow.Value);
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private static bool IsCriticalBreach(decimal value, ThresholdCacheEntry t) =>
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(t.CriticalLow.HasValue && value < t.CriticalLow.Value) ||
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(t.CriticalHigh.HasValue && value > t.CriticalHigh.Value);
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private static string BuildWarningDetails(string code, decimal value, ThresholdCacheEntry t) =>
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t.WarningHigh.HasValue && value > t.WarningHigh.Value
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? $"{code} value {value} is above warning high of {t.WarningHigh}."
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: $"{code} value {value} is below warning low of {t.WarningLow}.";
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}
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