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<?php
declare(strict_types=1);
namespace Bakame\Http\StructuredFields\Validation;
use Bakame\Http\StructuredFields\Item;
use Bakame\Http\StructuredFields\StructuredFieldProvider;
use Bakame\Http\StructuredFields\SyntaxError;
use Stringable;
/**
* Structured field Item validator.
*
* @phpstan-import-type SfType from StructuredFieldProvider
*/
final class ItemValidator
{
/** @var callable(SfType): (string|bool) */
private mixed $valueConstraint;
private ParametersValidator $parametersConstraint;
/**
* @param callable(SfType): (string|bool) $valueConstraint
*/
private function __construct(
callable $valueConstraint,
ParametersValidator $parametersConstraint,
) {
$this->valueConstraint = $valueConstraint;
$this->parametersConstraint = $parametersConstraint;
}
public static function new(): self
{
return new self(fn (mixed $value) => false, ParametersValidator::new());
}
/**
* Validates the Item value.
*
* On success populate the result item property
* On failure populates the result errors property
*
* @param callable(SfType): (string|bool) $constraint
*/
public function value(callable $constraint): self
{
return new self($constraint, $this->parametersConstraint);
}
/**
* Validates the Item parameters as a whole.
*
* On failure populates the result errors property
*/
public function parameters(ParametersValidator $constraint): self
{
return new self($this->valueConstraint, $constraint);
}
public function __invoke(Item|Stringable|string $item): bool|string
{
$result = $this->validate($item);
return $result->isSuccess() ? true : (string) $result->errors;
}
/**
* Validates the structured field Item.
*/
public function validate(Item|Stringable|string $item): Result
{
$violations = new ViolationList();
if (!$item instanceof Item) {
try {
$item = Item::fromHttpValue($item);
} catch (SyntaxError $exception) {
$violations->add(ErrorCode::ItemFailedParsing->value, new Violation('The item string could not be parsed.', previous: $exception));
return Result::failed($violations);
}
}
try {
$itemValue = $item->value($this->valueConstraint);
} catch (Violation $exception) {
$itemValue = null;
$violations->add(ErrorCode::ItemValueFailedValidation->value, $exception);
}
$validate = $this->parametersConstraint->validate($item->parameters());
$violations->addAll($validate->errors);
if ($violations->isNotEmpty()) {
return Result::failed($violations);
}
/** @var ValidatedParameters $validatedParameters */
$validatedParameters = $validate->data;
return Result::success(new ValidatedItem($itemValue, $validatedParameters));
}
}
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