Add project data

Tabletop.Core/Services/ClassServices.cs

@@ -0,0 +1,53 @@
+using DbController;
+using Tabletop.Core.Models;
+
+namespace Tabletop.Core.Services
+{
+    public class ClassService : IModelService<Class, int>
+    {
+        public Task CreateAsync(Class input, IDbController dbController, CancellationToken cancellationToken = default)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task DeleteAsync(Class input, IDbController dbController, CancellationToken cancellationToken = default)
+        {
+            throw new NotImplementedException();
+        }
+
+        public static async Task<List<Class>> GetAllAsync(IDbController dbController, CancellationToken cancellationToken = default)
+        {
+            string sql = "SELECT * FROM Classes";
+
+            var list = await dbController.SelectDataAsync<Class>(sql, cancellationToken: cancellationToken);
+            await LoadClassDescriptionsAsync(list, dbController, cancellationToken);
+            return list;
+        }
+
+        public Task<Class?> GetAsync(int identifier, IDbController dbController, CancellationToken cancellationToken = default)
+        {
+            throw new NotImplementedException();
+        }
+
+        private static async Task LoadClassDescriptionsAsync(List<Class> list, IDbController dbController, CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (list.Count != 0)
+            {
+                IEnumerable<int> classIds = list.Select(x => x.ClassId);
+                string sql = $"SELECT * FROM ClassDescription WHERE ClassId IN ({string.Join(",", classIds)})";
+                List<ClassDescription> descriptions = await dbController.SelectDataAsync<ClassDescription>(sql, null, cancellationToken);
+
+                foreach (var item in list)
+                {
+                    item.Description = [.. descriptions.Where(x => x.ClassId == item.ClassId)];
+                }
+            }
+        }
+
+        public Task UpdateAsync(Class input, IDbController dbController, CancellationToken cancellationToken = default)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}