<?php declare(strict_types=1);
/*
 * This file is part of sebastian/global-state.
 *
 * (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 SebastianBergmann\GlobalState;

use function array_keys;
use function array_merge;
use function array_reverse;
use function assert;
use function get_declared_classes;
use function get_declared_interfaces;
use function get_declared_traits;
use function get_defined_constants;
use function get_defined_functions;
use function get_included_files;
use function in_array;
use function ini_get_all;
use function is_array;
use function is_object;
use function is_resource;
use function is_scalar;
use function serialize;
use function unserialize;
use ReflectionClass;
use SebastianBergmann\ObjectReflector\ObjectReflector;
use SebastianBergmann\RecursionContext\Context;
use Throwable;

/**
 * A snapshot of global state.
 */
final class Snapshot
{
    private ExcludeList $excludeList;

    /**
     * @var array<string, mixed>
     */
    private array $globalVariables = [];

    /**
     * @var list<string>
     */
    private array $superGlobalArrays = [];

    /**
     * @var array<string, array<string, mixed>>
     */
    private array $superGlobalVariables = [];

    /**
     * @var array<string, array<string, mixed>>
     */
    private array $staticProperties = [];

    /**
     * @var array<non-empty-string, array{global_value: string, local_value: string, access: int}>
     */
    private array $iniSettings = [];

    /**
     * @var list<string>
     */
    private array $includedFiles = [];

    /**
     * @var array<string, mixed>
     */
    private array $constants = [];

    /**
     * @var list<callable-string>
     */
    private array $functions = [];

    /**
     * @var list<class-string>
     */
    private array $interfaces = [];

    /**
     * @var list<class-string>
     */
    private array $classes = [];

    /**
     * @var list<class-string>
     */
    private array $traits = [];

    public function __construct(?ExcludeList $excludeList = null, bool $includeGlobalVariables = true, bool $includeStaticProperties = true, bool $includeConstants = true, bool $includeFunctions = true, bool $includeClasses = true, bool $includeInterfaces = true, bool $includeTraits = true, bool $includeIniSettings = true, bool $includeIncludedFiles = true)
    {
        $this->excludeList = $excludeList ?: new ExcludeList;

        if ($includeConstants) {
            $this->snapshotConstants();
        }

        if ($includeFunctions) {
            $this->snapshotFunctions();
        }

        if ($includeClasses || $includeStaticProperties) {
            $this->snapshotClasses();
        }

        if ($includeInterfaces) {
            $this->snapshotInterfaces();
        }

        if ($includeGlobalVariables) {
            $this->setupSuperGlobalArrays();
            $this->snapshotGlobals();
        }

        if ($includeStaticProperties) {
            $this->snapshotStaticProperties();
        }

        if ($includeIniSettings) {
            $iniSettings = ini_get_all(null, false);

            assert($iniSettings !== false);

            $this->iniSettings = $iniSettings;
        }

        if ($includeIncludedFiles) {
            $this->includedFiles = get_included_files();
        }

        if ($includeTraits) {
            $this->traits = get_declared_traits();
        }
    }

    public function excludeList(): ExcludeList
    {
        return $this->excludeList;
    }

    /**
     * @return array<string, mixed>
     */
    public function globalVariables(): array
    {
        return $this->globalVariables;
    }

    /**
     * @return array<string, array<string, mixed>>
     */
    public function superGlobalVariables(): array
    {
        return $this->superGlobalVariables;
    }

    /**
     * @return list<string>
     */
    public function superGlobalArrays(): array
    {
        return $this->superGlobalArrays;
    }

    /**
     * @return array<string, array<string, mixed>>
     */
    public function staticProperties(): array
    {
        return $this->staticProperties;
    }

    /**
     * @return array<non-empty-string, array{global_value: string, local_value: string, access: int}>
     */
    public function iniSettings(): array
    {
        return $this->iniSettings;
    }

    /**
     * @return list<string>
     */
    public function includedFiles(): array
    {
        return $this->includedFiles;
    }

    /**
     * @return array<string, mixed>
     */
    public function constants(): array
    {
        return $this->constants;
    }

    /**
     * @return list<callable-string>
     */
    public function functions(): array
    {
        return $this->functions;
    }

    /**
     * @return list<class-string>
     */
    public function interfaces(): array
    {
        return $this->interfaces;
    }

    /**
     * @return list<class-string>
     */
    public function classes(): array
    {
        return $this->classes;
    }

    /**
     * @return list<class-string>
     */
    public function traits(): array
    {
        return $this->traits;
    }

    private function snapshotConstants(): void
    {
        $constants = get_defined_constants(true);

        if (isset($constants['user'])) {
            $this->constants = $constants['user'];
        }
    }

    private function snapshotFunctions(): void
    {
        $functions = get_defined_functions();

        $this->functions = $functions['user'];
    }

    private function snapshotClasses(): void
    {
        foreach (array_reverse(get_declared_classes()) as $className) {
            $class = new ReflectionClass($className);

            if (!$class->isUserDefined()) {
                break;
            }

            $this->classes[] = $className;
        }

        $this->classes = array_reverse($this->classes);
    }

    private function snapshotInterfaces(): void
    {
        foreach (array_reverse(get_declared_interfaces()) as $interfaceName) {
            $class = new ReflectionClass($interfaceName);

            if (!$class->isUserDefined()) {
                break;
            }

            $this->interfaces[] = $interfaceName;
        }

        $this->interfaces = array_reverse($this->interfaces);
    }

    private function snapshotGlobals(): void
    {
        $superGlobalArrays = $this->superGlobalArrays();

        foreach ($superGlobalArrays as $superGlobalArray) {
            $this->snapshotSuperGlobalArray($superGlobalArray);
        }

        foreach (array_keys($GLOBALS) as $key) {
            if ($key !== 'GLOBALS' &&
                !in_array($key, $superGlobalArrays, true) &&
                $this->canBeSerialized($GLOBALS[$key]) &&
                !$this->excludeList->isGlobalVariableExcluded($key)) {
                /* @noinspection UnserializeExploitsInspection */
                $this->globalVariables[$key] = unserialize(serialize($GLOBALS[$key]));
            }
        }
    }

    private function snapshotSuperGlobalArray(string $superGlobalArray): void
    {
        $this->superGlobalVariables[$superGlobalArray] = [];

        if (isset($GLOBALS[$superGlobalArray]) && is_array($GLOBALS[$superGlobalArray])) {
            foreach ($GLOBALS[$superGlobalArray] as $key => $value) {
                /* @noinspection UnserializeExploitsInspection */
                $this->superGlobalVariables[$superGlobalArray][$key] = unserialize(serialize($value));
            }
        }
    }

    private function snapshotStaticProperties(): void
    {
        foreach ($this->classes as $className) {
            $class    = new ReflectionClass($className);
            $snapshot = [];

            foreach ($class->getProperties() as $property) {
                if ($property->isStatic()) {
                    $name = $property->getName();

                    if ($this->excludeList->isStaticPropertyExcluded($className, $name)) {
                        continue;
                    }

                    if (!$property->isInitialized()) {
                        continue;
                    }

                    $value = $property->getValue();

                    if ($this->canBeSerialized($value)) {
                        /* @noinspection UnserializeExploitsInspection */
                        $snapshot[$name] = unserialize(serialize($value));
                    }
                }
            }

            if (!empty($snapshot)) {
                $this->staticProperties[$className] = $snapshot;
            }
        }
    }

    private function setupSuperGlobalArrays(): void
    {
        $this->superGlobalArrays = [
            '_ENV',
            '_POST',
            '_GET',
            '_COOKIE',
            '_SERVER',
            '_FILES',
            '_REQUEST',
        ];
    }

    private function canBeSerialized(mixed $variable): bool
    {
        if (is_scalar($variable) || $variable === null) {
            return true;
        }

        if (is_resource($variable)) {
            return false;
        }

        foreach ($this->enumerateObjectsAndResources($variable) as $value) {
            if (is_resource($value)) {
                return false;
            }

            if (is_object($value)) {
                $class = new ReflectionClass($value);

                if ($class->isAnonymous()) {
                    return false;
                }

                try {
                    @serialize($value);
                } catch (Throwable $t) {
                    return false;
                }
            }
        }

        return true;
    }

    /**
     * @return array<mixed>
     */
    private function enumerateObjectsAndResources(mixed $variable, Context $processed = new Context): array
    {
        $result = [];

        if ($processed->contains($variable)) {
            return $result;
        }

        $array = $variable;

        /* @noinspection UnusedFunctionResultInspection */
        $processed->add($variable);

        if (is_array($variable)) {
            /** @phpstan-ignore foreach.nonIterable */
            foreach ($array as $element) {
                if (!is_array($element) && !is_object($element) && !is_resource($element)) {
                    continue;
                }

                if (!is_resource($element)) {
                    /** @noinspection SlowArrayOperationsInLoopInspection */
                    $result = array_merge(
                        $result,
                        $this->enumerateObjectsAndResources($element, $processed),
                    );
                } else {
                    $result[] = $element;
                }
            }
        } else {
            $result[] = $variable;

            foreach ((new ObjectReflector)->getProperties($variable) as $value) {
                if (!is_array($value) && !is_object($value) && !is_resource($value)) {
                    continue;
                }

                if (!is_resource($value)) {
                    /** @noinspection SlowArrayOperationsInLoopInspection */
                    $result = array_merge(
                        $result,
                        $this->enumerateObjectsAndResources($value, $processed),
                    );
                } else {
                    $result[] = $value;
                }
            }
        }

        return $result;
    }
}

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

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