MRB webassembly

MesaFabApproval.API/Services/ECNService.cs

@@ -0,0 +1,46 @@
+using Microsoft.Extensions.Caching.Memory;
+
+namespace MesaFabApproval.API.Services;
+
+public interface IECNService {
+    Task<bool> IsValidECNNumber(int number);
+}
+
+public class ECNService : IECNService {
+    private readonly ILogger<ECNService> _logger;
+    private readonly IMemoryCache _cache;
+    private readonly IDalService _dalService;
+
+    public ECNService(ILogger<ECNService> logger, IMemoryCache cache, IDalService dalService) {
+        _logger = logger ?? throw new ArgumentNullException("ILogger not injected");
+        _cache = cache ?? throw new ArgumentNullException("IMemoryCache not injected");
+        _dalService = dalService ?? throw new ArgumentNullException("IDalService not injected");
+    }
+
+    public async Task<bool> IsValidECNNumber(int number) {
+        try {
+            _logger.LogInformation($"Attempting to determine if {number} is a valid ECN#");
+
+            if (number <= 0) return false;
+
+            IEnumerable<int> ecnNumbers = _cache.Get<IEnumerable<int>>("ecnNumbers") ?? new HashSet<int>();
+
+            if (ecnNumbers.Contains(number)) return true;
+
+            string sql = $"select count(ECNNumber) as count from ECN where ECNNumber={number}";
+
+            int rowsReturned = (await _dalService.QueryAsync<int>(sql)).FirstOrDefault();
+
+            if (rowsReturned > 0) {
+                ecnNumbers.Append(number);
+                _cache.Set("ecnNumbers", ecnNumbers);
+                return true;
+            }
+
+            return false;
+        } catch (Exception ex) {
+            _logger.LogError($"Unable to determine if {number} is a valid ECN#, because {ex.Message}");
+            throw;
+        }
+    }
+}