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<?php

declare(strict_types=1);

namespace Codeception\Test;

use Codeception\Exception\ConfigurationException;
use Codeception\Test\Loader\Cept as CeptLoader;
use Codeception\Test\Loader\Cest as CestLoader;
use Codeception\Test\Loader\Gherkin as GherkinLoader;
use Codeception\Test\Loader\LoaderInterface;
use Codeception\Test\Loader\Unit as UnitLoader;
use Exception;
use Symfony\Component\Finder\Finder;

use function array_merge;
use function file_exists;
use function getcwd;
use function is_dir;
use function preg_match;
use function str_replace;

/**
 * Loads all Codeception supported test formats from a directory.
 *
 * ``` php
 * <?php
 * $testLoader = new \Codeception\TestLoader('tests/unit');
 * $testLoader->loadTests();
 * $tests = $testLoader->getTests();
 * ```
 * You can load specific file
 *
 * ``` php
 * <?php
 * $testLoader = new \Codeception\TestLoader('tests/unit');
 * $testLoader->loadTest('UserTest.php');
 * $testLoader->loadTest('PostTest.php');
 * $tests = $testLoader->getTests();
 * ```
 * or a subdirectory
 *
 * ``` php
 * <?php
 * $testLoader = new \Codeception\TestLoader('tests/unit');
 * $testLoader->loadTest('models'); // all tests from tests/unit/models
 * $tests = $testLoader->getTests();
 * ```
 *
 */
class Loader
{
    /**
     * @var LoaderInterface[]
     */
    protected array $formats = [];

    protected array $tests = [];

    protected ?string $path = null;

    private ?string $shard = null;

    public function __construct(array $suiteSettings)
    {
        $this->path = $suiteSettings['path'];
        $this->shard = $suiteSettings['shard'] ?? null;

        $this->formats = [
            new CeptLoader(),
            new CestLoader($suiteSettings),
            new UnitLoader(),
            new GherkinLoader($suiteSettings)
        ];
        if (isset($suiteSettings['formats'])) {
            foreach ($suiteSettings['formats'] as $format) {
                $this->formats[] = new $format($suiteSettings);
            }
        }
    }

    public function getTests(): array
    {
        if ($this->shard) {
            $this->shard = trim($this->shard);
            if (!preg_match('~^\d+\/\d+$~', $this->shard)) {
                throw new ConfigurationException('Shard must be set as --shard=CURRENT/TOTAL where CURRENT and TOTAL are number. For instance: --shard=1/3');
            }

            [$shard, $totalShards] = explode('/', $this->shard);

            if ($shard < 1) {
                throw new ConfigurationException("Incorrect shard index. Use 1/{$totalShards} to start the first shard");
            }

            if ($totalShards < $shard) {
                throw new ConfigurationException('Total shards are less than current shard');
            }

            $chunks = $this->splitTestsIntoChunks((int)$totalShards);

            return $chunks[$shard - 1] ?? [];
        }
        return $this->tests;
    }

    private function splitTestsIntoChunks(int $chunks): array
    {
        if (empty($this->tests)) {
            return [];
        }
        return array_chunk($this->tests, intval(ceil(sizeof($this->tests) / $chunks)));
    }

    protected function relativeName(string $file): string
    {
        return str_replace([$this->path, '\\'], ['', '/'], $file);
    }

    protected function findPath(string $path): string
    {
        if (
            !file_exists($path)
            && !str_ends_with($path, '.php')
            && file_exists($newPath = $path . '.php')
        ) {
            return $newPath;
        }

        return $path;
    }

    protected function makePath(string $originalPath): string
    {
        $path = $this->path . $this->relativeName($originalPath);

        if (
            file_exists($newPath = $this->findPath($path))
            || file_exists($newPath = $this->findPath(getcwd() . "/{$originalPath}"))
        ) {
            $path = $newPath;
        }

        if (!file_exists($path)) {
            throw new Exception("File or path {$originalPath} not found");
        }

        return $path;
    }

    public function loadTest(string $path): void
    {
        $path = $this->makePath($path);

        foreach ($this->formats as $format) {
            if (preg_match($format->getPattern(), $path)) {
                $format->loadTests($path);
                $this->tests = $format->getTests();
                return;
            }
        }

        if (is_dir($path)) {
            $currentPath = $this->path;
            $this->path = $path;
            $this->loadTests();
            $this->path = $currentPath;
            return;
        }
        throw new Exception('Test format not supported. Please, check you use the right suffix. Available filetypes: Cept, Cest, Test');
    }

    public function loadTests(string $fileName = null): void
    {
        if ($fileName) {
            $this->loadTest($fileName);
            return;
        }

        $finder = Finder::create()->files()->sortByName()->in($this->path)->followLinks();

        foreach ($this->formats as $format) {
            $formatFinder = clone($finder);
            $testFiles = $formatFinder->name($format->getPattern());
            foreach ($testFiles as $test) {
                $pathname = str_replace(["//", "\\\\"], ["/", "\\"], $test->getPathname());
                $format->loadTests($pathname);
            }
            $this->tests = array_merge($this->tests, $format->getTests());
        }
    }
}