<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Security\Core\User;

use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
use Symfony\Component\Security\Core\Exception\UserNotFoundException;

/**
 * InMemoryUserProvider is a simple non persistent user provider.
 *
 * Useful for testing, demonstration, prototyping, and for simple needs
 * (a backend with a unique admin for instance)
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @template-implements UserProviderInterface<InMemoryUser>
 */
class InMemoryUserProvider implements UserProviderInterface
{
    /**
     * @var array<string, UserInterface>
     */
    private array $users = [];

    /**
     * The user array is a hash where the keys are usernames and the values are
     * an array of attributes: 'password', 'enabled', and 'roles'.
     *
     * @param array<string, array{password?: string, enabled?: bool, roles?: list<string>}> $users An array of users
     */
    public function __construct(array $users = [])
    {
        foreach ($users as $username => $attributes) {
            $password = $attributes['password'] ?? null;
            $enabled = $attributes['enabled'] ?? true;
            $roles = $attributes['roles'] ?? [];
            $user = new InMemoryUser($username, $password, $roles, $enabled);

            $this->createUser($user);
        }
    }

    /**
     * Adds a new User to the provider.
     */
    public function createUser(UserInterface $user): void
    {
        if (!$user instanceof InMemoryUser) {
            throw new UnsupportedUserException(\sprintf('Instances of "%s" are not supported.', get_debug_type($user)));
        }

        $userIdentifier = strtolower($user->getUserIdentifier());
        if (isset($this->users[$userIdentifier])) {
            throw new \LogicException('Another user with the same username already exists.');
        }

        $this->users[$userIdentifier] = $user;
    }

    public function loadUserByIdentifier(string $identifier): UserInterface
    {
        $user = $this->getUser($identifier);

        return new InMemoryUser($user->getUserIdentifier(), $user->getPassword(), $user->getRoles(), $user->isEnabled());
    }

    public function refreshUser(UserInterface $user): UserInterface
    {
        if (!$user instanceof InMemoryUser) {
            throw new UnsupportedUserException(\sprintf('Instances of "%s" are not supported.', get_debug_type($user)));
        }

        $storedUser = $this->getUser($user->getUserIdentifier());
        $userIdentifier = $storedUser->getUserIdentifier();

        return new InMemoryUser($userIdentifier, $storedUser->getPassword(), $storedUser->getRoles(), $storedUser->isEnabled());
    }

    public function supportsClass(string $class): bool
    {
        return InMemoryUser::class == $class;
    }

    /**
     * Returns the user by given user.
     *
     * @throws UserNotFoundException if user whose given username does not exist
     */
    private function getUser(string $username): InMemoryUser
    {
        if (!isset($this->users[strtolower($username)])) {
            $ex = new UserNotFoundException(\sprintf('Username "%s" does not exist.', $username));
            $ex->setUserIdentifier($username);

            throw $ex;
        }

        return $this->users[strtolower($username)];
    }
}
