feature: HL7 FHIR R4 Integration

2026-06-27 22:23:45 +08:00
parent 756cff332c
commit 5646dfddb4
27 changed files with 2658 additions and 16 deletions
@@ -0,0 +1,90 @@
+using Hl7.Fhir.Model;
+using FhirEncounter = Hl7.Fhir.Model.Encounter;
+
+public static class EncounterMapper
+{
+    /// <summary>
+    /// Maps a VigilCare Encounter entity to a FHIR R4 Encounter resource.
+    ///
+    /// Mapping decisions:
+    /// - VigilCare encounter Status ("active", "discharged") maps to FHIR
+    ///   Encounter.Status (in-progress, finished).
+    /// - Department maps to Encounter.serviceType using a local CodeSystem.
+    ///   Facilities should map to their own department OID or SNOMED CT codes.
+    /// - SourceBatchId is preserved as an extension for traceability.
+    /// </summary>
+    public static FhirEncounter ToFhir(Encounter entity, string baseUrl)
+    {
+        var encounter = new FhirEncounter
+        {
+            Id = entity.Id.ToString(),
+            Meta = new Meta
+            {
+                VersionId = "1",
+                LastUpdated = entity.UpdatedAt,
+            },
+            Status = entity.Status?.ToLowerInvariant() switch
+            {
+                "active" => FhirEncounter.EncounterStatus.InProgress,
+                "discharged" => FhirEncounter.EncounterStatus.Finished,
+                "cancelled" => FhirEncounter.EncounterStatus.Cancelled,
+                _ => FhirEncounter.EncounterStatus.Unknown,
+            },
+            Class = new Coding(
+                "http://terminology.hl7.org/CodeSystem/v3-ActCode",
+                "IMP",
+                "inpatient encounter"),
+            Subject = new ResourceReference($"Patient/{entity.PatientId}"),
+        };
+
+        if (entity.AdmissionDate.HasValue)
+        {
+            encounter.Period = new Period
+            {
+                StartElement = new FhirDateTime(entity.AdmissionDate.Value),
+            };
+        }
+
+        if (entity.Department.HasValue)
+        {
+            encounter.ServiceType = new CodeableConcept(
+                "urn:vigilcare:department",
+                entity.Department.Value.ToString(),
+                entity.Department.Value.ToString());
+        }
+
+        if (!string.IsNullOrEmpty(entity.RoomBed))
+        {
+            encounter.Location.Add(new FhirEncounter.LocationComponent
+            {
+                Location = new ResourceReference { Display = entity.RoomBed },
+                Status = FhirEncounter.EncounterLocationStatus.Active,
+            });
+        }
+
+        if (!string.IsNullOrEmpty(entity.AdmissionReason))
+        {
+            encounter.ReasonCode.Add(new CodeableConcept { Text = entity.AdmissionReason });
+        }
+
+        if (!string.IsNullOrEmpty(entity.DischargeDiagnosis))
+        {
+            encounter.Diagnosis.Add(new FhirEncounter.DiagnosisComponent
+            {
+                Condition = new ResourceReference { Display = entity.DischargeDiagnosis },
+                Use = new CodeableConcept(
+                    "http://terminology.hl7.org/CodeSystem/diagnosis-role",
+                    "DD", "Discharge diagnosis"),
+            });
+        }
+
+        if (entity.SourceBatchId.HasValue)
+        {
+            encounter.Extension.Add(new Extension(
+                "urn:vigilcare:source-batch-id",
+                new FhirString(entity.SourceBatchId.Value.ToString())));
+        }
+
+        return encounter;
+    }
+}