PlanTempusApp/Database/IdentitySystem/UserService.cs

using Core.Entities.Users;
using Insight.Database;
using System.Data;

namespace Database.IdentitySystem
{
    public class UserService
    {
        private readonly IDbConnection _db;

        public UserService(IDbConnection db)
        {
            _db = db;
        }

        public async Task CreateUserWithTenant(string email, string password, string tenantConnectionString)
        {
            var schema = "dev";

            if (_db.State != ConnectionState.Open)
                _db.Open();

            using var transaction = _db.BeginTransaction();
            try
            {
                // Create user
                var user = new User
                {
                    Email = email,
                    PasswordHash = PasswordHasher.HashPassword(password),
                    SecurityStamp = Guid.NewGuid().ToString(),
                    EmailConfirmed = false,
                    CreatedDate = DateTime.UtcNow
                };

                var userId = await _db.ExecuteScalarAsync<int>(@$"
                INSERT INTO {schema}.users (email, password_hash, security_stamp, email_confirmed, created_date)
                VALUES (@Email, @PasswordHash, @SecurityStamp, @EmailConfirmed, @CreatedDate)
                RETURNING id", user);

                // Create tenant
                var tenant = new Tenant
                {
                    ConnectionString = tenantConnectionString,
                    CreatedDate = DateTime.UtcNow,
                    CreatedBy = userId,
                    IsActive = true
                };

                var tenantId = await _db.ExecuteScalarAsync<int>(@$"
                INSERT INTO {schema}.tenants (connection_string, created_date, created_by, is_active)
                VALUES (@ConnectionString, @CreatedDate, @CreatedBy, @IsActive)
                RETURNING id", tenant);

                // Link user to tenant
                var userTenant = new UserTenant
                {
                    UserId = userId,
                    TenantId = tenantId,
                    CreatedDate = DateTime.UtcNow
                };

                await _db.ExecuteAsync(@$"
                INSERT INTO {schema}.user_tenants (user_id, tenant_id, created_date)
                VALUES (@UserId, @TenantId, @CreatedDate)", userTenant);

                transaction.Commit();
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
    }
}