<?php declare(strict_types = 1);

namespace SlevomatCodingStandard\Sniffs\Namespaces;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;
use SlevomatCodingStandard\Helpers\NamespaceHelper;
use SlevomatCodingStandard\Helpers\SniffSettingsHelper;
use SlevomatCodingStandard\Helpers\UseStatementHelper;
use function sprintf;
use const T_USE;

class UseOnlyWhitelistedNamespacesSniff implements Sniff
{

	public const CODE_NON_FULLY_QUALIFIED = 'NonFullyQualified';

	public bool $allowUseFromRootNamespace = false;

	/** @var list<string> */
	public array $namespacesRequiredToUse = [];

	/** @var list<string>|null */
	private ?array $normalizedNamespacesRequiredToUse = null;

	/**
	 * @return array<int, (int|string)>
	 */
	public function register(): array
	{
		return [
			T_USE,
		];
	}

	public function process(File $phpcsFile, int $usePointer): void
	{
		if (!UseStatementHelper::isImportUse($phpcsFile, $usePointer)) {
			return;
		}

		$className = UseStatementHelper::getFullyQualifiedTypeNameFromUse($phpcsFile, $usePointer);
		if ($this->allowUseFromRootNamespace && !NamespaceHelper::isQualifiedName($className)) {
			return;
		}

		foreach ($this->getNamespacesRequiredToUse() as $namespace) {
			if (!NamespaceHelper::isTypeInNamespace($className, $namespace)) {
				continue;
			}

			return;
		}

		$phpcsFile->addError(sprintf(
			'Type %s should not be used, but referenced via a fully qualified name.',
			$className,
		), $usePointer, self::CODE_NON_FULLY_QUALIFIED);
	}

	/**
	 * @return list<string>
	 */
	private function getNamespacesRequiredToUse(): array
	{
		$this->normalizedNamespacesRequiredToUse ??= SniffSettingsHelper::normalizeArray($this->namespacesRequiredToUse);

		return $this->normalizedNamespacesRequiredToUse;
	}

}
