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<?php

declare(strict_types=1);

namespace Mautic\LeadBundle\DataObject;

use Mautic\CoreBundle\Form\DataTransformer\BarStringTransformer;
use Mautic\LeadBundle\Exception\InvalidContactFieldTokenException;

/**
 * A value object representation of a contact field token.
 */
class ContactFieldToken
{
    private string $fieldAlias;

    private ?string $defaultValue;

    /**
     * @throws InvalidContactFieldTokenException
     */
    public function __construct(
        private string $fullToken
    ) {
        $this->parse(trim($fullToken));
    }

    public function getFullToken(): string
    {
        return $this->fullToken;
    }

    public function getFieldAlias(): string
    {
        return $this->fieldAlias;
    }

    public function getDefaultValue(): ?string
    {
        return $this->defaultValue;
    }

    private function parse(string $fullToken): void
    {
        preg_match('/^{contactfield=(.*?)}$/', $fullToken, $matches);

        if (empty($matches[1])) {
            throw new InvalidContactFieldTokenException("'{$fullToken}' is not a valid contact field token. A valid token example: '{contactfield=firstname|John}'");
        }

        $barStringTransformer = new BarStringTransformer();
        $array                = $barStringTransformer->reverseTransform($matches[1]);
        $this->fieldAlias     = $array[0];
        $this->defaultValue   = $array[1] ?? null;
    }
}