<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\Models\SocialAccount;
use App\Models\User;
use Illuminate\Auth\Events\Registered;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;
use Laravel\Socialite\Facades\Socialite;

class SocialAuthController extends Controller
{
    public function redirect(string $provider)
    {
        $enabled = $this->isProviderEnabled($provider);

        if (! $enabled) {
            return redirect()->route('login')
                ->with('error', ucfirst($provider) . ' login is not enabled.');
        }

        return Socialite::driver($provider)->redirect();
    }

    public function callback(string $provider)
    {
        $enabled = $this->isProviderEnabled($provider);

        if (! $enabled) {
            return redirect()->route('login')
                ->with('error', ucfirst($provider) . ' login is not enabled.');
        }

        try {
            $socialUser = Socialite::driver($provider)->user();
        } catch (\Exception $e) {
            return redirect()->route('login')
                ->with('error', 'Failed to login with ' . ucfirst($provider) . '. Please try again.');
        }

        $account = SocialAccount::findByProvider($provider, $socialUser->getId());

        if ($account) {
            Auth::login($account->user);

            return $this->redirectAfterLogin();
        }

        $email = $socialUser->getEmail();

        if (! $email) {
            return redirect()->route('login')
                ->with('error', 'Your ' . ucfirst($provider) . ' account does not have an email address linked.');
        }

        $existingUser = User::where('mail', $email)->first();

        if ($existingUser && $existingUser->hasSocialAccount($provider)) {
            return redirect()->route('login')
                ->with('error', 'This ' . ucfirst($provider) . ' account is already linked to another user.');
        }

        if ($existingUser && ! $existingUser->hasSocialAccount($provider)) {
            $existingUser->socialAccounts()->create([
                'provider' => $provider,
                'provider_id' => $socialUser->getId(),
                'avatar' => $socialUser->getAvatar(),
            ]);

            Auth::login($existingUser);

            return $this->redirectAfterLogin();
        }

        $username = $this->generateUsername($socialUser->getName() ?? $provider . '_user');

        $user = User::create([
            'username' => $username,
            'mail' => $email,
            'password' => Hash::make(Str::random(16)),
            'account_created' => time(),
            'last_login' => time(),
            'motto' => 'New player',
            'look' => 'hr-100-61.hd-180-1.ch-210-66',
            'ip_register' => request()->ip(),
            'ip_current' => request()->ip(),
        ]);

        $user->socialAccounts()->create([
            'provider' => $provider,
            'provider_id' => $socialUser->getId(),
            'avatar' => $socialUser->getAvatar(),
        ]);

        event(new Registered($user));

        Auth::login($user);

        return $this->redirectAfterLogin();
    }

    protected function isProviderEnabled(string $provider): bool
    {
        $key = 'social_login_' . $provider . '_enabled';

        return setting($key) === '1';
    }

    protected function generateUsername(string $name): string
    {
        $baseUsername = Str::slug($name, '');
        $username = $baseUsername;
        $counter = 1;

        while (User::where('username', $username)->exists()) {
            $username = $baseUsername . $counter;
            $counter++;
        }

        return $username;
    }

    protected function redirectAfterLogin()
    {
        return redirect()->intended('/');
    }

    public function unlink(Request $request, string $provider)
    {
        $user = $request->user();

        $user->socialAccounts()->where('provider', $provider)->delete();

        return back()->with('success', ucfirst($provider) . ' account has been unlinked.');
    }
}