<?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\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\Exception\MissingOptionsException;

/**
 * Validates a collection with constraints defined for specific keys.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
class Collection extends Composite
{
    public const MISSING_FIELD_ERROR = '2fa2158c-2a7f-484b-98aa-975522539ff8';
    public const NO_SUCH_FIELD_ERROR = '7703c766-b5d5-4cef-ace7-ae0dd82304e9';

    protected const ERROR_NAMES = [
        self::MISSING_FIELD_ERROR => 'MISSING_FIELD_ERROR',
        self::NO_SUCH_FIELD_ERROR => 'NO_SUCH_FIELD_ERROR',
    ];

    public array $fields = [];
    public bool $allowExtraFields = false;
    public bool $allowMissingFields = false;
    public string $extraFieldsMessage = 'This field was not expected.';
    public string $missingFieldsMessage = 'This field is missing.';

    /**
     * @param array<string,Constraint|list<Constraint>>|null $fields             An associative array defining keys in the collection and their constraints
     * @param string[]|null                                  $groups
     * @param bool|null                                      $allowExtraFields   Whether to allow additional keys not declared in the configured fields (defaults to false)
     * @param bool|null                                      $allowMissingFields Whether to allow the collection to lack some fields declared in the configured fields (defaults to false)
     */
    public function __construct(?array $fields = null, ?array $groups = null, mixed $payload = null, ?bool $allowExtraFields = null, ?bool $allowMissingFields = null, ?string $extraFieldsMessage = null, ?string $missingFieldsMessage = null)
    {
        if (null === $fields) {
            throw new MissingOptionsException(\sprintf('The options "fields" must be set for constraint "%s".', self::class), ['fields']);
        }

        $this->fields = $fields;

        parent::__construct(null, $groups, $payload);

        $this->allowExtraFields = $allowExtraFields ?? $this->allowExtraFields;
        $this->allowMissingFields = $allowMissingFields ?? $this->allowMissingFields;
        $this->extraFieldsMessage = $extraFieldsMessage ?? $this->extraFieldsMessage;
        $this->missingFieldsMessage = $missingFieldsMessage ?? $this->missingFieldsMessage;
    }

    protected function initializeNestedConstraints(): void
    {
        parent::initializeNestedConstraints();

        foreach ($this->fields as $fieldName => $field) {
            // the XmlFileLoader and YamlFileLoader pass the field Optional
            // and Required constraint as an array with exactly one element
            if (\is_array($field) && 1 == \count($field)) {
                $this->fields[$fieldName] = $field = $field[0];
            }

            if (!$field instanceof Optional && !$field instanceof Required) {
                $this->fields[$fieldName] = new Required($field ?? []);
            }
        }
    }

    protected function getCompositeOption(): string
    {
        return 'fields';
    }
}
