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AMREZ.EOP.Application/UseCases/Authentications/RegisterUseCase.cs

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+using System.Data;
+using AMREZ.EOP.Abstractions.Applications.Tenancy;
+using AMREZ.EOP.Abstractions.Applications.UseCases.Authentications;
+using AMREZ.EOP.Abstractions.Infrastructures.Common;
+using AMREZ.EOP.Abstractions.Infrastructures.Repositories;
+using AMREZ.EOP.Abstractions.Security;
+using AMREZ.EOP.Contracts.DTOs.Authentications.Register;
+using AMREZ.EOP.Domain.Entities.Authentications;
+using AMREZ.EOP.Domain.Shared._Users;
+using Microsoft.AspNetCore.Http;
+
+namespace AMREZ.EOP.Application.UseCases.Authentications;
+
+public sealed class RegisterUseCase : IRegisterUseCase
+{
+    private readonly ITenantResolver _tenantResolver;
+    private readonly IUnitOfWork _uow;
+    private readonly IUserRepository _users;
+    private readonly IPasswordHasher _hasher;
+    private readonly IHttpContextAccessor _http;
+
+    public RegisterUseCase(
+        ITenantResolver resolver,
+        IUnitOfWork uow,
+        IUserRepository users,
+        IPasswordHasher hasher,
+        IHttpContextAccessor http)
+    {
+        _tenantResolver = resolver; _uow = uow; _users = users; _hasher = hasher; _http = http;
+    }
+
+    public async Task<RegisterResponse?> ExecuteAsync(RegisterRequest request, CancellationToken ct = default)
+    {
+        var http = _http.HttpContext ?? throw new InvalidOperationException("No HttpContext");
+        var tenant = _tenantResolver.Resolve(http, request);
+        if (tenant is null) return null;
+
+        var emailNorm = request.Email.Trim().ToLowerInvariant();
+
+        await _uow.BeginAsync(tenant, IsolationLevel.ReadCommitted, ct);
+        try
+        {
+            if (await _users.EmailExistsAsync(emailNorm, ct))
+            {
+                await _uow.RollbackAsync(ct);
+                return null;
+            }
+
+            var hash = _hasher.Hash(request.Password);
+
+            var user = new User
+            {
+                PasswordHash = hash,
+                IsActive = true,
+            };
+
+            // แนบอัตลักษณ์แบบ Email (เก็บในตารางลูก)
+            user.Identities.Add(new UserIdentity
+            {
+                Type = IdentityType.Email,
+                Identifier = emailNorm,
+                IsPrimary = true,
+                VerifiedAt = null
+            });
+
+            await _users.AddAsync(user, ct);
+            await _uow.CommitAsync(ct);
+
+            // ไม่ส่ง DisplayName (ปล่อยให้ HR/Presentation สร้าง)
+            return new RegisterResponse(user.Id, string.Empty, emailNorm, tenant.Id);
+        }
+        catch
+        {
+            await _uow.RollbackAsync(ct);
+            throw;
+        }
+    }
+}