silent-auction/app/Http/Controllers/Auth/SocialiteController.php

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Laravel\Socialite\Facades\Socialite;
use Illuminate\Support\Str;

class SocialiteController extends Controller
{
    public function redirectToProvider($provider)
    {
        return Socialite::driver($provider)->redirect();
    }

    public function handleProviderCallback($provider)
    {
        try {
            $socialUser = Socialite::driver($provider)->user();
        } catch (\Exception $e) {
            return redirect('/login')->with('error', 'Authentication failed.');
        }

        if (Auth::check()) {
            $user = Auth::user();
            $user->update([
                'provider_name' => $provider,
                'provider_id' => $socialUser->getId(),
            ]);
            
            return redirect()->intended('/admin')->with('status', 'Account linked successfully!');
        }

        // Find user by provider_id
        $user = User::where('provider_name', $provider)
            ->where('provider_id', $socialUser->getId())
            ->first();

        if (!$user) {
            // Find user by email to link
            $user = User::where('email', $socialUser->getEmail())->first();

            if ($user) {
                // Link the account
                $user->update([
                    'provider_name' => $provider,
                    'provider_id' => $socialUser->getId(),
                ]);
            } else {
                // Optionally create a new user
                $user = User::create([
                    'name' => $socialUser->getName() ?? $socialUser->getNickname() ?? $socialUser->getEmail(),
                    'email' => $socialUser->getEmail(),
                    'provider_name' => $provider,
                    'provider_id' => $socialUser->getId(),
                    'password' => bcrypt(Str::random(24)),
                ]);
            }
        }

        Auth::login($user);

        return redirect()->intended('/admin'); // Redirect to filament admin or home
    }
}