<?php

namespace App\Controller;

use App\Domain\CmsUser;
use App\Domain\InvalidAccount;
use App\Security\UserDirectory;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;

/**
 * Accounts. The list and every change to somebody else's account need ROLE_ADMIN; the own password
 * is the one thing every signed in account may change, and only with the current one in hand.
 */
final class UserController extends AbstractController
{
    public function __construct(private UserDirectory $users, private TokenStorageInterface $tokens)
    {
    }

    #[Route('/%kant.admin_path%/benutzer', name: 'admin_users', methods: ['GET'])]
    public function index(): Response
    {
        $this->denyAccessUnlessGranted('ROLE_ADMIN');

        return $this->render('admin/users.html.twig', [
            'users' => $this->users->all(),
            'roles' => UserDirectory::ROLES,
            'roleHelp' => UserDirectory::ROLE_HELP,
            'minPassword' => UserDirectory::MIN_PASSWORD,
            'maxPassword' => UserDirectory::MAX_PASSWORD,
            'me' => $this->cmsUser()->id,
        ]);
    }

    #[Route('/%kant.admin_path%/benutzer/neu', name: 'admin_user_create', methods: ['POST'])]
    public function create(Request $request): Response
    {
        if (null !== $refusal = $this->guard($request)) {
            return $refusal;
        }
        try {
            $this->users->create(
                $request->request->getString('username'),
                $request->request->getString('password'),
                $request->request->getString('role'),
            );
        } catch (InvalidAccount $e) {
            return $this->back($e->getMessage());
        }

        return $this->back('Das Konto wurde angelegt.', 'success');
    }

    #[Route('/%kant.admin_path%/benutzer/{id}/rolle', name: 'admin_user_role', requirements: ['id' => '[a-zA-Z0-9_-]{1,64}'], methods: ['POST'])]
    public function role(Request $request, string $id): Response
    {
        if (null !== $refusal = $this->guard($request)) {
            return $refusal;
        }
        try {
            $this->users->changeRole($id, $request->request->getString('role'), $this->cmsUser());
        } catch (InvalidAccount $e) {
            return $this->back($e->getMessage());
        }

        return $this->back('Die Rolle wurde geändert. Offene Sitzungen dieses Kontos sind damit abgemeldet.', 'success');
    }

    #[Route('/%kant.admin_path%/benutzer/{id}/passwort', name: 'admin_user_password', requirements: ['id' => '[a-zA-Z0-9_-]{1,64}'], methods: ['POST'])]
    public function password(Request $request, string $id): Response
    {
        if (null !== $refusal = $this->guard($request)) {
            return $refusal;
        }
        try {
            $this->users->setPassword($id, $request->request->getString('password'));
        } catch (InvalidAccount $e) {
            return $this->back($e->getMessage());
        }

        return $this->back('Das Passwort wurde gesetzt. Offene Sitzungen dieses Kontos sind damit abgemeldet.', 'success');
    }

    #[Route('/%kant.admin_path%/benutzer/{id}/loeschen', name: 'admin_user_delete', requirements: ['id' => '[a-zA-Z0-9_-]{1,64}'], methods: ['POST'])]
    public function delete(Request $request, string $id): Response
    {
        if (null !== $refusal = $this->guard($request)) {
            return $refusal;
        }
        try {
            $this->users->delete($id, $this->cmsUser());
        } catch (InvalidAccount $e) {
            return $this->back($e->getMessage());
        }

        return $this->back('Das Konto wurde gelöscht.', 'success');
    }

    #[Route('/%kant.admin_path%/konto', name: 'admin_account', methods: ['GET'])]
    public function account(): Response
    {
        $this->denyAccessUnlessGranted('ROLE_EDITOR');
        $me = $this->cmsUser();
        $mine = null;
        foreach ($this->users->all() as $account) {
            if ($account['id'] === $me->id) {
                $mine = $account;
            }
        }

        return $this->render('admin/account.html.twig', [
            'account' => $mine,
            'roles' => UserDirectory::ROLES,
            'roleHelp' => UserDirectory::ROLE_HELP,
            'minPassword' => UserDirectory::MIN_PASSWORD,
            'maxPassword' => UserDirectory::MAX_PASSWORD,
        ]);
    }

    #[Route('/%kant.admin_path%/konto/passwort', name: 'admin_account_password', methods: ['POST'])]
    public function ownPassword(Request $request): Response
    {
        $this->denyAccessUnlessGranted('ROLE_EDITOR');
        if (!$this->isCsrfTokenValid('account', $request->request->getString('_csrf_token'))) {
            return $this->back('Deine Sitzung ist abgelaufen. Bitte melde dich erneut an.', 'error', 'admin_account');
        }
        $me = $this->cmsUser();
        try {
            $fresh = $this->users->changeOwnPassword(
                $me,
                $request->request->getString('current'),
                $request->request->getString('password'),
            );
        } catch (InvalidAccount $e) {
            return $this->back($e->getMessage(), 'error', 'admin_account');
        }

        // Keep this session signed in with the new hash. Every other session of the account fails
        // its next refresh against the database and is logged out - which is the point.
        $this->tokens->setToken(new UsernamePasswordToken($fresh, 'admin', $fresh->getRoles()));

        return $this->back('Das Passwort wurde geändert. Andere offene Sitzungen dieses Kontos sind abgemeldet.', 'success', 'admin_account');
    }

    /** Every write needs the administrator role and a valid token; the check is the same each time. */
    private function guard(Request $request): ?Response
    {
        $this->denyAccessUnlessGranted('ROLE_ADMIN');
        if (!$this->isCsrfTokenValid('users', $request->request->getString('_csrf_token'))) {
            return $this->back('Deine Sitzung ist abgelaufen. Bitte melde dich erneut an.');
        }

        return null;
    }

    private function cmsUser(): CmsUser
    {
        $user = $this->getUser();
        if (!$user instanceof CmsUser) {
            throw $this->createAccessDeniedException();
        }

        return $user;
    }

    private function back(string $message, string $type = 'error', string $route = 'admin_users'): Response
    {
        $this->addFlash($type, $message);

        return $this->redirectToRoute($route);
    }
}