class Collection

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>|array<string,mixed>|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(mixed $fields = null, ?array $groups = null, mixed $payload = null, ?bool $allowExtraFields = null, ?bool $allowMissingFields = null, ?string $extraFieldsMessage = null, ?string $missingFieldsMessage = null) {
        if (self::isFieldsOption($fields)) {
            $fields = [
                'fields' => $fields,
            ];
        }
        parent::__construct($fields, $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($field);
            }
        }
    }
    public function getRequiredOptions() : array {
        return [
            'fields',
        ];
    }
    protected function getCompositeOption() : string {
        return 'fields';
    }
    private static function isFieldsOption($options) : bool {
        if (!\is_array($options)) {
            return false;
        }
        foreach ($options as $optionOrField) {
            if ($optionOrField instanceof Constraint) {
                return true;
            }
            if (null === $optionOrField) {
                continue;
            }
            if (!\is_array($optionOrField)) {
                return false;
            }
            if ($optionOrField && !($optionOrField[0] ?? null) instanceof Constraint) {
                return false;
            }
        }
        return true;
    }

}