<?php declare(strict_types=1);
/*
 * This file is part of phpunit/php-code-coverage.
 *
 * (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\CodeCoverage\StaticAnalysis;

use function file_get_contents;
use function file_put_contents;
use function implode;
use function is_file;
use function md5;
use function serialize;
use function unserialize;
use SebastianBergmann\CodeCoverage\Util\Filesystem;
use SebastianBergmann\FileIterator\Facade as FileIteratorFacade;

/**
 * @internal This class is not covered by the backward compatibility promise for phpunit/php-code-coverage
 *
 * @phpstan-import-type CodeUnitFunctionType from \SebastianBergmann\CodeCoverage\StaticAnalysis\CodeUnitFindingVisitor
 * @phpstan-import-type CodeUnitMethodType from \SebastianBergmann\CodeCoverage\StaticAnalysis\CodeUnitFindingVisitor
 * @phpstan-import-type CodeUnitClassType from \SebastianBergmann\CodeCoverage\StaticAnalysis\CodeUnitFindingVisitor
 * @phpstan-import-type CodeUnitTraitType from \SebastianBergmann\CodeCoverage\StaticAnalysis\CodeUnitFindingVisitor
 * @phpstan-import-type LinesOfCodeType from \SebastianBergmann\CodeCoverage\StaticAnalysis\FileAnalyser
 * @phpstan-import-type LinesType from \SebastianBergmann\CodeCoverage\StaticAnalysis\FileAnalyser
 */
final class CachingFileAnalyser implements FileAnalyser
{
    private static ?string $cacheVersion = null;
    private readonly string $directory;
    private readonly FileAnalyser $analyser;
    private readonly bool $useAnnotationsForIgnoringCode;
    private readonly bool $ignoreDeprecatedCode;
    private array $cache = [];

    public function __construct(string $directory, FileAnalyser $analyser, bool $useAnnotationsForIgnoringCode, bool $ignoreDeprecatedCode)
    {
        Filesystem::createDirectory($directory);

        $this->analyser                      = $analyser;
        $this->directory                     = $directory;
        $this->useAnnotationsForIgnoringCode = $useAnnotationsForIgnoringCode;
        $this->ignoreDeprecatedCode          = $ignoreDeprecatedCode;
    }

    /**
     * @return array<string, CodeUnitClassType>
     */
    public function classesIn(string $filename): array
    {
        if (!isset($this->cache[$filename])) {
            $this->process($filename);
        }

        return $this->cache[$filename]['classesIn'];
    }

    /**
     * @return array<string, CodeUnitTraitType>
     */
    public function traitsIn(string $filename): array
    {
        if (!isset($this->cache[$filename])) {
            $this->process($filename);
        }

        return $this->cache[$filename]['traitsIn'];
    }

    /**
     * @return array<string, CodeUnitFunctionType>
     */
    public function functionsIn(string $filename): array
    {
        if (!isset($this->cache[$filename])) {
            $this->process($filename);
        }

        return $this->cache[$filename]['functionsIn'];
    }

    /**
     * @return LinesOfCodeType
     */
    public function linesOfCodeFor(string $filename): array
    {
        if (!isset($this->cache[$filename])) {
            $this->process($filename);
        }

        return $this->cache[$filename]['linesOfCodeFor'];
    }

    /**
     * @return LinesType
     */
    public function executableLinesIn(string $filename): array
    {
        if (!isset($this->cache[$filename])) {
            $this->process($filename);
        }

        return $this->cache[$filename]['executableLinesIn'];
    }

    /**
     * @return LinesType
     */
    public function ignoredLinesFor(string $filename): array
    {
        if (!isset($this->cache[$filename])) {
            $this->process($filename);
        }

        return $this->cache[$filename]['ignoredLinesFor'];
    }

    public function process(string $filename): void
    {
        $cache = $this->read($filename);

        if ($cache !== false) {
            $this->cache[$filename] = $cache;

            return;
        }

        $this->cache[$filename] = [
            'classesIn'         => $this->analyser->classesIn($filename),
            'traitsIn'          => $this->analyser->traitsIn($filename),
            'functionsIn'       => $this->analyser->functionsIn($filename),
            'linesOfCodeFor'    => $this->analyser->linesOfCodeFor($filename),
            'ignoredLinesFor'   => $this->analyser->ignoredLinesFor($filename),
            'executableLinesIn' => $this->analyser->executableLinesIn($filename),
        ];

        $this->write($filename, $this->cache[$filename]);
    }

    private function read(string $filename): array|false
    {
        $cacheFile = $this->cacheFile($filename);

        if (!is_file($cacheFile)) {
            return false;
        }

        return unserialize(
            file_get_contents($cacheFile),
            ['allowed_classes' => false],
        );
    }

    private function write(string $filename, array $data): void
    {
        file_put_contents(
            $this->cacheFile($filename),
            serialize($data),
        );
    }

    private function cacheFile(string $filename): string
    {
        $cacheKey = md5(
            implode(
                "\0",
                [
                    $filename,
                    file_get_contents($filename),
                    self::cacheVersion(),
                    $this->useAnnotationsForIgnoringCode,
                    $this->ignoreDeprecatedCode,
                ],
            ),
        );

        return $this->directory . DIRECTORY_SEPARATOR . $cacheKey;
    }

    private static function cacheVersion(): string
    {
        if (self::$cacheVersion !== null) {
            return self::$cacheVersion;
        }

        $buffer = [];

        foreach ((new FileIteratorFacade)->getFilesAsArray(__DIR__, '.php') as $file) {
            $buffer[] = $file;
            $buffer[] = file_get_contents($file);
        }

        self::$cacheVersion = md5(implode("\0", $buffer));

        return self::$cacheVersion;
    }
}

.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