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AMREZ.EOP.Application/UseCases/Authentications/LoginUseCase.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.Login;
+using Microsoft.AspNetCore.Http;
+
+namespace AMREZ.EOP.Application.UseCases.Authentications;
+
+public sealed class LoginUseCase : ILoginUseCase
+{
+    private readonly ITenantResolver _tenantResolver;
+    private readonly IUserRepository _users;
+    private readonly IPasswordHasher _hasher;
+    private readonly IHttpContextAccessor _http;
+    private readonly IUnitOfWork _uow;
+
+    public LoginUseCase(ITenantResolver r, IUserRepository u, IPasswordHasher h, IHttpContextAccessor http, IUnitOfWork uow)
+    { _tenantResolver = r; _users = u; _hasher = h; _http = http; _uow = uow; }
+
+    public async Task<LoginResponse?> ExecuteAsync(LoginRequest 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;
+
+        await _uow.BeginAsync(tenant, IsolationLevel.ReadCommitted, ct);
+        try
+        {
+            var email = request.Email.Trim().ToLowerInvariant();
+            var user = await _users.FindActiveByEmailAsync(email, ct);
+            if (user is null || !_hasher.Verify(request.Password, user.PasswordHash))
+            {
+                await _uow.RollbackAsync(ct);
+                return null;
+            }
+
+            await _uow.CommitAsync(ct);
+
+            // NOTE: ไม่ใช้ DisplayName ใน Entity แล้ว — ส่งกลับเป็นค่าว่าง/ไปดึงจาก HR ฝั่ง API
+            return new LoginResponse(user.Id, string.Empty, email, tenant.Id);
+        }
+        catch
+        {
+            await _uow.RollbackAsync(ct);
+            throw;
+        }
+    }
+}