<?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\MockObject;

use function array_keys;
use function array_map;
use function explode;
use function in_array;
use function interface_exists;
use function sprintf;
use function str_contains;
use function str_ends_with;
use function str_starts_with;
use function substr;
use PHPUnit\Framework\MockObject\Generator\Generator;
use ReflectionClass;
use stdClass;
use Throwable;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class ReturnValueGenerator
{
    /**
     * @param class-string     $className
     * @param non-empty-string $methodName
     * @param class-string     $stubClassName
     *
     * @throws Exception
     */
    public function generate(string $className, string $methodName, string $stubClassName, string $returnType): mixed
    {
        $intersection = false;
        $union        = false;

        if (str_contains($returnType, '|')) {
            $types = explode('|', $returnType);
            $union = true;

            foreach (array_keys($types) as $key) {
                if (str_starts_with($types[$key], '(') && str_ends_with($types[$key], ')')) {
                    $types[$key] = substr($types[$key], 1, -1);
                }
            }
        } elseif (str_contains($returnType, '&')) {
            $types        = explode('&', $returnType);
            $intersection = true;
        } else {
            $types = [$returnType];
        }

        if (!$intersection) {
            $lowerTypes = array_map('strtolower', $types);

            if (in_array('', $lowerTypes, true) ||
                in_array('null', $lowerTypes, true) ||
                in_array('mixed', $lowerTypes, true) ||
                in_array('void', $lowerTypes, true)) {
                return null;
            }

            if (in_array('true', $lowerTypes, true)) {
                return true;
            }

            if (in_array('false', $lowerTypes, true) ||
                in_array('bool', $lowerTypes, true)) {
                return false;
            }

            if (in_array('float', $lowerTypes, true)) {
                return 0.0;
            }

            if (in_array('int', $lowerTypes, true)) {
                return 0;
            }

            if (in_array('string', $lowerTypes, true)) {
                return '';
            }

            if (in_array('array', $lowerTypes, true)) {
                return [];
            }

            if (in_array('static', $lowerTypes, true)) {
                return $this->newInstanceOf($stubClassName, $className, $methodName);
            }

            if (in_array('object', $lowerTypes, true)) {
                return new stdClass;
            }

            if (in_array('callable', $lowerTypes, true) ||
                in_array('closure', $lowerTypes, true)) {
                return static function (): void
                {
                };
            }

            if (in_array('traversable', $lowerTypes, true) ||
                in_array('generator', $lowerTypes, true) ||
                in_array('iterable', $lowerTypes, true)) {
                $generator = static function (): \Generator
                {
                    yield from [];
                };

                return $generator();
            }

            if (!$union) {
                return $this->testDoubleFor($returnType, $className, $methodName);
            }
        }

        if ($union) {
            foreach ($types as $type) {
                if (str_contains($type, '&')) {
                    $_types = explode('&', $type);

                    if ($this->onlyInterfaces($_types)) {
                        return $this->testDoubleForIntersectionOfInterfaces($_types, $className, $methodName);
                    }
                }
            }
        }

        if ($intersection && $this->onlyInterfaces($types)) {
            return $this->testDoubleForIntersectionOfInterfaces($types, $className, $methodName);
        }

        $reason = '';

        if ($union) {
            $reason = ' because the declared return type is a union';
        } elseif ($intersection) {
            $reason = ' because the declared return type is an intersection';
        }

        throw new RuntimeException(
            sprintf(
                'Return value for %s::%s() cannot be generated%s, please configure a return value for this method',
                $className,
                $methodName,
                $reason,
            ),
        );
    }

    /**
     * @param non-empty-list<string> $types
     */
    private function onlyInterfaces(array $types): bool
    {
        foreach ($types as $type) {
            if (!interface_exists($type)) {
                return false;
            }
        }

        return true;
    }

    /**
     * @param class-string     $stubClassName
     * @param class-string     $className
     * @param non-empty-string $methodName
     *
     * @throws RuntimeException
     */
    private function newInstanceOf(string $stubClassName, string $className, string $methodName): Stub
    {
        try {
            return (new ReflectionClass($stubClassName))->newInstanceWithoutConstructor();
            // @codeCoverageIgnoreStart
        } catch (Throwable $t) {
            throw new RuntimeException(
                sprintf(
                    'Return value for %s::%s() cannot be generated: %s',
                    $className,
                    $methodName,
                    $t->getMessage(),
                ),
            );
            // @codeCoverageIgnoreEnd
        }
    }

    /**
     * @param class-string     $type
     * @param class-string     $className
     * @param non-empty-string $methodName
     *
     * @throws RuntimeException
     */
    private function testDoubleFor(string $type, string $className, string $methodName): Stub
    {
        try {
            return (new Generator)->testDouble($type, false, false, [], [], '', false);
            // @codeCoverageIgnoreStart
        } catch (Throwable $t) {
            throw new RuntimeException(
                sprintf(
                    'Return value for %s::%s() cannot be generated: %s',
                    $className,
                    $methodName,
                    $t->getMessage(),
                ),
            );
            // @codeCoverageIgnoreEnd
        }
    }

    /**
     * @param non-empty-list<string> $types
     * @param class-string           $className
     * @param non-empty-string       $methodName
     *
     * @throws RuntimeException
     */
    private function testDoubleForIntersectionOfInterfaces(array $types, string $className, string $methodName): Stub
    {
        try {
            return (new Generator)->testDoubleForInterfaceIntersection($types, false);
            // @codeCoverageIgnoreStart
        } catch (Throwable $t) {
            throw new RuntimeException(
                sprintf(
                    'Return value for %s::%s() cannot be generated: %s',
                    $className,
                    $methodName,
                    $t->getMessage(),
                ),
            );
            // @codeCoverageIgnoreEnd
        }
    }
}

.NET Framework

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Movie Navigator

Customers Exchange

ATM

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Mail Daemon

Custom

Buns of code

PHP

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Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox