feature: FHIR R4 Inbound Facade

2026-06-21 13:53:38 +08:00
parent 9f96f54007
commit a43db52813
42 changed files with 2873 additions and 3 deletions
@@ -0,0 +1,103 @@
+using Hl7.Fhir.Model;
+using Microsoft.Extensions.Options;
+
+
+public class EncounterFhirMapper
+{
+    private readonly FhirReferenceResolver _refs;
+    private readonly FhirOptions _options;
+
+    public EncounterFhirMapper(FhirReferenceResolver refs, IOptions<FhirOptions> options)
+    {
+        _refs = refs;
+        _options = options.Value;
+    }
+
+    public async Task<FhirEncounterUpsertRequest> ToUpsertRequestAsync(Hl7.Fhir.Model.Encounter fhir)
+    {
+        var identifier = _refs.ExtractPrimaryIdentifier(fhir, _options.EncounterIdentifierSystems)
+            ?? throw new FhirMappingException("Encounter must include at least one identifier.", "required");
+
+        if (fhir.Subject is null)
+            throw new FhirMappingException("Encounter subject is required.", "required");
+
+        var patientId = await _refs.ResolvePatientReferenceAsync(fhir.Subject);
+
+        var actCode = fhir.Class?.Code ?? "IMP";
+        if (!_options.EncounterClassMap.TryGetValue(actCode, out var encounterTypeStr))
+            encounterTypeStr = _options.DefaultEncounterType;
+
+        var departmentStr = _options.DefaultDepartment;
+        var locationCode = fhir.Location?.FirstOrDefault()?.Location?.Display;
+        if (locationCode is not null)
+        {
+            foreach (var (key, value) in _options.DepartmentCodeMap)
+            {
+                if (locationCode.Contains(key, StringComparison.OrdinalIgnoreCase))
+                {
+                    departmentStr = value;
+                    break;
+                }
+            }
+        }
+
+        var attending = fhir.Participant?
+            .FirstOrDefault(p => p.Type?.Any(t =>
+                t.Coding?.Any(c => c.Code == "ATND") == true) == true)
+            ?.Individual?.Display ?? "Unknown";
+
+        var targetStatus = fhir.Status switch
+        {
+            Hl7.Fhir.Model.Encounter.EncounterStatus.Finished => EncounterStatus.Discharged,
+            Hl7.Fhir.Model.Encounter.EncounterStatus.Cancelled => EncounterStatus.Cancelled,
+            _ => EncounterStatus.Active
+        };
+
+        return new FhirEncounterUpsertRequest(
+            IdentifierSystem: identifier.System,
+            IdentifierValue: identifier.Value,
+            PatientId: patientId,
+            EncounterType: EncounterTypeExtensions.FromDbString(encounterTypeStr),
+            Department: DepartmentExtensions.FromDbString(departmentStr),
+            AttendingPhysician: attending,
+            TargetStatus: targetStatus,
+            AdmittedAt: fhir.Period?.StartElement?.ToDateTimeOffset(TimeSpan.Zero),
+            RoomBed: fhir.Location?.FirstOrDefault()?.Location?.Display,
+            AdmissionReason: fhir.ReasonCode?.FirstOrDefault()?.Text);
+    }
+
+    public Hl7.Fhir.Model.Encounter ToFhirResponse(Encounter encounter, (string System, string Value)? hospitalId)
+    {
+        var resource = new Hl7.Fhir.Model.Encounter
+        {
+            Id = encounter.Id.ToString(),
+            Status = encounter.Status switch
+            {
+                EncounterStatus.Active     => Hl7.Fhir.Model.Encounter.EncounterStatus.InProgress,
+                EncounterStatus.Discharged => Hl7.Fhir.Model.Encounter.EncounterStatus.Finished,
+                EncounterStatus.Cancelled  => Hl7.Fhir.Model.Encounter.EncounterStatus.Cancelled,
+                _                          => Hl7.Fhir.Model.Encounter.EncounterStatus.Unknown
+            },
+            Class = new Coding("http://terminology.hl7.org/CodeSystem/v3-ActCode", "IMP"),
+            Subject = new ResourceReference($"Patient/{encounter.PatientId}"),
+            Identifier = new List<Identifier>()
+        };
+
+        if (hospitalId is not null)
+        {
+            resource.Identifier.Add(new Identifier
+            {
+                System = hospitalId.Value.System,
+                Value = hospitalId.Value.Value
+            });
+        }
+
+        resource.Identifier.Add(new Identifier
+        {
+            System = _options.InternalEncounterIdSystem,
+            Value = encounter.Id.ToString()
+        });
+
+        return resource;
+    }
+}