<?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\Config\Definition;

use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;

/**
 * Node which only allows a finite set of values.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class EnumNode extends ScalarNode
{
    private array $values;

    public function __construct(?string $name, ?NodeInterface $parent = null, array $values = [], string $pathSeparator = BaseNode::DEFAULT_PATH_SEPARATOR)
    {
        if (!$values) {
            throw new \InvalidArgumentException('$values must contain at least one element.');
        }

        foreach ($values as $value) {
            if (null === $value || \is_scalar($value)) {
                continue;
            }

            if (!$value instanceof \UnitEnum) {
                throw new \InvalidArgumentException(sprintf('"%s" only supports scalar, enum, or null values, "%s" given.', __CLASS__, get_debug_type($value)));
            }

            if ($value::class !== ($enumClass ??= $value::class)) {
                throw new \InvalidArgumentException(sprintf('"%s" only supports one type of enum, "%s" and "%s" passed.', __CLASS__, $enumClass, $value::class));
            }
        }

        parent::__construct($name, $parent, $pathSeparator);
        $this->values = $values;
    }

    /**
     * @return array
     */
    public function getValues()
    {
        return $this->values;
    }

    /**
     * @internal
     */
    public function getPermissibleValues(string $separator): string
    {
        return implode($separator, array_unique(array_map(static function (mixed $value): string {
            if (!$value instanceof \UnitEnum) {
                return json_encode($value);
            }

            return ltrim(var_export($value, true), '\\');
        }, $this->values)));
    }

    /**
     * @return void
     */
    protected function validateType(mixed $value)
    {
        if ($value instanceof \UnitEnum) {
            return;
        }

        parent::validateType($value);
    }

    protected function finalizeValue(mixed $value): mixed
    {
        $value = parent::finalizeValue($value);

        if (!\in_array($value, $this->values, true)) {
            $ex = new InvalidConfigurationException(sprintf('The value %s is not allowed for path "%s". Permissible values: %s', json_encode($value), $this->getPath(), $this->getPermissibleValues(', ')));
            $ex->setPath($this->getPath());

            throw $ex;
        }

        return $value;
    }
}