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<?php
declare(strict_types=1);
namespace Zhineng\Snowflake;
final class Structure
{
/**
* The ID components.
*
* @var \Zhineng\Snowflake\Component[]
*/
private array $fields = [];
/**
* The current bit offset.
*/
private int $currentOffset = 0;
/**
* The number of sequence fields added.
*/
private int $sequenceCount = 0;
/**
* Add a field to the structure.
*/
public function add(Component $field): self
{
if ($field instanceof Sequence && ++$this->sequenceCount > 1) {
throw new \LogicException('Only one sequence field is allowed in a structure.');
}
if ($this->currentOffset + $field->bits() > 63) {
throw new \OverflowException('Total structure size cannot exceed 63 bits.');
}
$this->fields[] = $field->setOffset($this->currentOffset);
$this->currentOffset += $field->bits();
return $this;
}
/**
* The ID components.
*
* @return \Zhineng\Snowflake\Component[]
*/
public function components(): array
{
return $this->fields;
}
/**
* The total size in bits.
*/
public function size(): int
{
return $this->currentOffset;
}
}
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