<?php declare(strict_types = 1);

namespace PHPStan\Rules\Deprecations;

use PhpParser\Node;
use PHPStan\Analyser\Scope;
use PHPStan\Node\InClassMethodNode;
use PHPStan\Reflection\MethodReflection;
use PHPStan\Reflection\ParametersAcceptorSelector;

/**
 * @implements \PHPStan\Rules\Rule<InClassMethodNode>
 */
class TypeHintDeprecatedInClassMethodSignatureRule implements \PHPStan\Rules\Rule
{

	/** @var DeprecatedClassHelper */
	private $deprecatedClassHelper;

	public function __construct(DeprecatedClassHelper $deprecatedClassHelper)
	{
		$this->deprecatedClassHelper = $deprecatedClassHelper;
	}

	public function getNodeType(): string
	{
		return InClassMethodNode::class;
	}

	public function processNode(Node $node, Scope $scope): array
	{
		if (DeprecatedScopeHelper::isScopeDeprecated($scope)) {
			return [];
		}

		/** @var MethodReflection $method */
		$method = $scope->getFunction();
		if (!$method instanceof MethodReflection) {
			throw new \PHPStan\ShouldNotHappenException();
		}
		$methodSignature = ParametersAcceptorSelector::selectSingle($method->getVariants());

		$errors = [];
		foreach ($methodSignature->getParameters() as $i => $parameter) {
			$deprecatedClasses = $this->deprecatedClassHelper->filterDeprecatedClasses($parameter->getType()->getReferencedClasses());
			foreach ($deprecatedClasses as $deprecatedClass) {
				if ($method->getDeclaringClass()->isAnonymous()) {
					$errors[] = sprintf(
						'Parameter $%s of method %s() in anonymous class has typehint with deprecated %s %s%s',
						$parameter->getName(),
						$method->getName(),
						$this->deprecatedClassHelper->getClassType($deprecatedClass),
						$deprecatedClass->getName(),
						$this->deprecatedClassHelper->getClassDeprecationDescription($deprecatedClass)
					);
				} else {
					$errors[] = sprintf(
						'Parameter $%s of method %s::%s() has typehint with deprecated %s %s%s',
						$parameter->getName(),
						$method->getDeclaringClass()->getName(),
						$method->getName(),
						$this->deprecatedClassHelper->getClassType($deprecatedClass),
						$deprecatedClass->getName(),
						$this->deprecatedClassHelper->getClassDeprecationDescription($deprecatedClass)
					);
				}
			}
		}

		$deprecatedClasses = $this->deprecatedClassHelper->filterDeprecatedClasses($methodSignature->getReturnType()->getReferencedClasses());
		foreach ($deprecatedClasses as $deprecatedClass) {
			if ($method->getDeclaringClass()->isAnonymous()) {
				$errors[] = sprintf(
					'Return type of method %s() in anonymous class has typehint with deprecated %s %s%s',
					$method->getName(),
					$this->deprecatedClassHelper->getClassType($deprecatedClass),
					$deprecatedClass->getName(),
					$this->deprecatedClassHelper->getClassDeprecationDescription($deprecatedClass)
				);
			} else {
				$errors[] = sprintf(
					'Return type of method %s::%s() has typehint with deprecated %s %s%s',
					$method->getDeclaringClass()->getName(),
					$method->getName(),
					$this->deprecatedClassHelper->getClassType($deprecatedClass),
					$deprecatedClass->getName(),
					$this->deprecatedClassHelper->getClassDeprecationDescription($deprecatedClass)
				);
			}
		}

		return $errors;
	}

}