Dashboard Page - Appointments:

- create separate dashboard components for doctor and patient
- add appointments to dashboard components
- add code to backend for appointments retrieval

backend/Application/Endpoints/Appointments/AppointmentManagementHandler.cs

@@ -116,4 +116,50 @@ public class AppointmentManagementHandler
             Data = null
         };
     }
+    
+    public async Task<BaseResponse> HandleGetAppointmentsByPatientId(Guid patientId)
+    {
+        var criteria = new List<(string FieldName, string Value)>
+        {
+            ("PatientId", patientId.ToString())
+        };
+        var appointments = await _appointmentsMongoDbService.FindAsync<Appointment>(criteria);
+        
+        if (appointments.Count == 0)
+            return new BaseResponse
+            {
+                StatusCode = HttpStatusCodes.NotFound,
+                Message = $"Appointments not found in system for patient with id {patientId}.",
+                Data = null
+            };
+        return new BaseResponse
+        {
+            StatusCode = HttpStatusCodes.OK,
+            Message = $"Appointments for patient with id {patientId} successfully retrieved.",
+            Data = appointments
+        };
+    }
+    
+    public async Task<BaseResponse> HandleGetAppointmentsByDoctorId(Guid doctorId)
+    {
+        var criteria = new List<(string FieldName, string Value)>
+        {
+            ("DoctorId", doctorId.ToString())
+        };
+        var appointments = await _appointmentsMongoDbService.FindAsync<Appointment>(criteria);
+
+        if (appointments.Count == 0)
+            return new BaseResponse
+            {
+                StatusCode = HttpStatusCodes.NotFound,
+                Message = $"Appointments not found in system for doctor with id {doctorId}.",
+                Data = null
+            };
+        return new BaseResponse
+        {
+            StatusCode = HttpStatusCodes.OK,
+            Message = $"Appointments for doctor with id {doctorId} successfully retrieved.",
+            Data = appointments
+        };
+    }
 }