<?php

declare(strict_types=1);

/*
 * This file is part of the humbug/php-scoper package.
 *
 * Copyright (c) 2017 Théo FIDRY <theo.fidry@gmail.com>,
 *                    Pádraic Brady <padraic.brady@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Humbug\PhpScoper;

use Humbug\PhpScoper\Console\Application;
use Humbug\PhpScoper\Console\ApplicationFactory;
use Iterator;
use PackageVersions\Versions;
use function array_pop;
use function count;
use function str_split;
use function strrpos;
use function substr;

function create_application(): Application
{
    return (new ApplicationFactory())->create();
}

function get_php_scoper_version(): string
{
    // Since PHP-Scoper relies on COMPOSER_ROOT_VERSION the version parsed by PackageVersions, we rely on Box
    // placeholders in order to get the right version for the PHAR.
    if (0 === strpos(__FILE__, 'phar:')) {
        return '@git_version_placeholder@';
    }

    $rawVersion = Versions::getVersion('humbug/php-scoper');

    [$prettyVersion, $commitHash] = explode('@', $rawVersion);

    return $prettyVersion.'@'.substr($commitHash, 0, 7);
}

/**
 * @param string[] $paths Absolute paths
 *
 * @return string
 */
function get_common_path(array $paths): string
{
    $nbPaths = count($paths);

    if (0 === $nbPaths) {
        return '';
    }

    $pathRef = (string) array_pop($paths);

    if (1 === $nbPaths) {
        $commonPath = $pathRef;
    } else {
        $commonPath = '';

        foreach (str_split($pathRef) as $pos => $char) {
            foreach ($paths as $path) {
                if (!isset($path[$pos]) || $path[$pos] !== $char) {
                    break 2;
                }
            }

            $commonPath .= $char;
        }
    }

    foreach (['/', '\\'] as $separator) {
        $lastSeparatorPos = strrpos($commonPath, $separator);

        if (false !== $lastSeparatorPos) {
            $commonPath = rtrim(substr($commonPath, 0, $lastSeparatorPos), $separator);

            break;
        }
    }

    return $commonPath;
}

function chain(iterable ...$iterables): Iterator
{
    foreach ($iterables as $iterable) {
        yield from $iterable;
    }
}