<?php

namespace Composer\Util;

/**
 * @author Andreas Schempp <andreas.schempp@terminal42.ch>
 */
class Zip
{
	/**
	 * Gets content of the root composer.json inside a ZIP archive.
	 */
	public static function getComposerJson(string $pathToZip): ?string
	{
		if (!extension_loaded('zip')) {
		    throw new \RuntimeException('The Zip Util requires PHP\'s zip extension');
		}

		$zip = new \ZipArchive();
		if ($zip->open($pathToZip) !== true) {
		    return null;
		}

		if (0 === $zip->numFiles) {
		    $zip->close();

		    return null;
		}

		$foundFileIndex = self::locateFile($zip, 'composer.json');

		$content = null;
		$configurationFileName = $zip->getNameIndex($foundFileIndex);
		$stream = $zip->getStream($configurationFileName);

		if (false !== $stream) {
		    $content = stream_get_contents($stream);
		}

		$zip->close();

		return $content;
	}


	/**
	 * Find a file by name, returning the one that has the shortest path.
	 *
	 * @throws \RuntimeException
	 */
	private static function locateFile(\ZipArchive $zip, string $filename): int
	{
		if (false !== ($index = $zip->locateName($filename)) && $zip->getFromIndex($index) !== false) {
		    return $index;
		}

		$topLevelPaths = [];
		for ($i = 0; $i < $zip->numFiles; $i++) {
		    $name = $zip->getNameIndex($i);
		    $dirname = dirname($name);

		    // ignore OSX specific resource fork folder
		    if (strpos($name, '__MACOSX') !== false) {
		        continue;
		    }

		    // handle archives with proper TOC
		    if ($dirname === '.') {
		        $topLevelPaths[$name] = true;
		        if (\count($topLevelPaths) > 1) {
		            throw new \RuntimeException('Archive has more than one top level directories, and no composer.json was found on the top level, so it\'s an invalid archive. Top level paths found were: '.implode(',', array_keys($topLevelPaths)));
		        }
		        continue;
		    }

		    // handle archives which do not have a TOC record for the directory itself
		    if (false === strpos($dirname, '\\') && false === strpos($dirname, '/')) {
		        $topLevelPaths[$dirname.'/'] = true;
		        if (\count($topLevelPaths) > 1) {
		            throw new \RuntimeException('Archive has more than one top level directories, and no composer.json was found on the top level, so it\'s an invalid archive. Top level paths found were: '.implode(',', array_keys($topLevelPaths)));
		        }
		    }
		}

		if ($topLevelPaths && false !== ($index = $zip->locateName(key($topLevelPaths).$filename)) && $zip->getFromIndex($index) !== false) {
		    return $index;
		}

		throw new \RuntimeException('No composer.json found either at the top level or within the topmost directory');
	}
}
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