Kent-logistics-Laravel/app/Http/Controllers/Admin/AdminAuthController.php

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class AdminAuthController extends Controller
{
    public function showLoginForm()
    {
        return view('admin.login');
    }

    public function login(Request $request)
    {
        $request->validate([
            'login'    => 'required',
            'password' => 'required|string|min:6',
        ]);

        $loginInput = $request->input('login');

        if (filter_var($loginInput, FILTER_VALIDATE_EMAIL)) {
            $field = 'email';
        } elseif (preg_match('/^EMP\d+$/i', $loginInput)) {
            $field = 'employee_id';
        } else {
            $field = 'username';
        }

        $credentials = [
            $field => $loginInput,
            'password' => $request->password,
        ];

        // attempt login
        if (Auth::guard('admin')->attempt($credentials)) {
            $request->session()->regenerate();
            $user = Auth::guard('admin')->user();

            return redirect()->route('admin.dashboard')->with('success', 'Welcome back, ' . $user->name . '!');
        }

        return back()->withErrors(['login' => 'Invalid login credentials.']);
    }

    public function logout(Request $request)
    {
        Auth::guard('admin')->logout();
        $request->session()->invalidate();
        $request->session()->regenerateToken();
        return redirect()->route('admin.login')->with('success', 'Logged out successfully.');
    }
}