<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Framework\Constraint;

use function class_exists;
use function interface_exists;
use function sprintf;
use PHPUnit\Framework\UnknownClassOrInterfaceException;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 */
final class IsInstanceOf extends Constraint
{
    /**
     * @psalm-var class-string
     */
    private readonly string $name;

    /**
     * @psalm-var 'class'|'interface'
     */
    private readonly string $type;

    /**
     * @throws UnknownClassOrInterfaceException
     */
    public function __construct(string $name)
    {
        if (class_exists($name)) {
            $this->type = 'class';
        } elseif (interface_exists($name)) {
            $this->type = 'interface';
        } else {
            throw new UnknownClassOrInterfaceException($name);
        }

        $this->name = $name;
    }

    /**
     * Returns a string representation of the constraint.
     */
    public function toString(): string
    {
        return sprintf(
            'is an instance of %s %s',
            $this->type,
            $this->name,
        );
    }

    /**
     * Evaluates the constraint for parameter $other. Returns true if the
     * constraint is met, false otherwise.
     */
    protected function matches(mixed $other): bool
    {
        return $other instanceof $this->name;
    }

    /**
     * Returns the description of the failure.
     *
     * The beginning of failure messages is "Failed asserting that" in most
     * cases. This method should return the second part of that sentence.
     */
    protected function failureDescription(mixed $other): string
    {
        return $this->valueToTypeStringFragment($other) . $this->toString();
    }
}
