[Add] MasterData Services.

AMREZ.EOP.Application/UseCases/MasterData/Allergen/CreateAllergenUseCase.cs

@@ -0,0 +1,60 @@
+using System.Data;
+using AMREZ.EOP.Abstractions.Applications.Tenancy;
+using AMREZ.EOP.Abstractions.Applications.UseCases.MasterData.Allergen;
+using AMREZ.EOP.Abstractions.Infrastructures.Common;
+using AMREZ.EOP.Abstractions.Infrastructures.Repositories;
+using AMREZ.EOP.Contracts.DTOs.MasterData.Allergen;
+using Microsoft.AspNetCore.Http;
+
+namespace AMREZ.EOP.Application.UseCases.MasterData.Allergen;
+
+public sealed class CreateAllergenUseCase : ICreateAllergenUseCase
+{
+    private readonly IAllergenRepository _repo;
+    private readonly IUnitOfWork _uow;
+    private readonly ITenantResolver _tenantResolver;
+    private readonly IHttpContextAccessor _http;
+
+    public CreateAllergenUseCase(IAllergenRepository repo, IUnitOfWork uow, ITenantResolver tr, IHttpContextAccessor http)
+    {
+        _repo = repo; _uow = uow; _tenantResolver = tr; _http = http;
+    }
+
+    public async Task<AllergenResponse> ExecuteAsync(AllergenCreateRequest req, CancellationToken ct = default)
+    {
+        var http = _http.HttpContext ?? throw new InvalidOperationException("No HttpContext");
+        var tc = _tenantResolver.Resolve(http) ?? throw new InvalidOperationException("No tenant");
+
+        await _uow.BeginAsync(tc, IsolationLevel.ReadCommitted, ct);
+        try
+        {
+            var tid = Guid.Parse(tc.Id);
+
+            if (req.Scope == "tenant" && await _repo.CodeExistsAsync(tid, req.Code, ct))
+                throw new InvalidOperationException($"Brand code '{req.Code}' already exists.");
+
+            var entity = new Domain.Entities.MasterData.Allergen()
+            {
+                TenantId = tid,
+                Scope = string.IsNullOrWhiteSpace(req.Scope) ? "tenant" : req.Scope,
+                Code = req.Code.Trim(),
+                Name = req.Name.Trim(),
+                NameI18n = req.NameI18n,
+                Meta = req.Meta,
+                IsActive = req.IsActive,
+                IsSystem = false,
+                OverridesGlobalId = req.OverridesGlobalId
+            };
+
+            await _repo.AddAsync(entity, ct);
+            await _uow.CommitAsync(ct);
+
+            return new AllergenResponse(entity.Id, entity.Scope, entity.Code, entity.Name, entity.NameI18n, entity.OverridesGlobalId, entity.IsActive, entity.IsSystem, entity.Meta);
+        }
+        catch
+        {
+            await _uow.RollbackAsync(ct);
+            throw;
+        }
+    }
+}