<?php

namespace Composer\Repository\Vcs;

use Composer\Cache;
use Composer\Config;
use Composer\IO\IOInterface;
use Composer\Pcre\Preg;
use Composer\Util\Filesystem;
use Composer\Util\Git as GitUtil;
use Composer\Util\ProcessExecutor;
use Composer\Util\Url;

/**
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
class GitDriver extends VcsDriver
{
	/** @var array<int|string, string> Map of tag name (can be turned to an int by php if it is a numeric name) to identifier */
	protected $tags;

	/** @var array<int|string, string> Map of branch name (can be turned to an int by php if it is a numeric name) to identifier */
	protected $branches;

	/** @var string */
	protected $rootIdentifier;

	/** @var string */
	protected $repoDir;


	/**
	 * @inheritDoc
	 */
	public function initialize(): void
	{
		if (Filesystem::isLocalPath($this->url)) {
		    $this->url = Preg::replace('{[\\/]\.git/?$}', '', $this->url);
		    if (!is_dir($this->url)) {
		        throw new \RuntimeException('Failed to read package information from '.$this->url.' as the path does not exist');
		    }
		    $this->repoDir = $this->url;
		    $cacheUrl = realpath($this->url);
		} else {
		    if (!Cache::isUsable($this->config->get('cache-vcs-dir'))) {
		        throw new \RuntimeException('GitDriver requires a usable cache directory, and it looks like you set it to be disabled');
		    }

		    $this->repoDir = $this->config->get('cache-vcs-dir') . '/' . Preg::replace('{[^a-z0-9.]}i', '-', $this->url) . '/';

		    GitUtil::cleanEnv();

		    $fs = new Filesystem();
		    $fs->ensureDirectoryExists(dirname($this->repoDir));

		    if (!is_writable(dirname($this->repoDir))) {
		        throw new \RuntimeException('Can not clone '.$this->url.' to access package information. The "'.dirname($this->repoDir).'" directory is not writable by the current user.');
		    }

		    if (Preg::isMatch('{^ssh://[^@]+@[^:]+:[^0-9]+}', $this->url)) {
		        throw new \InvalidArgumentException('The source URL '.$this->url.' is invalid, ssh URLs should have a port number after ":".'."\n".'Use ssh://git@example.com:22/path or just git@example.com:path if you do not want to provide a password or custom port.');
		    }

		    $gitUtil = new GitUtil($this->io, $this->config, $this->process, $fs);
		    if (!$gitUtil->syncMirror($this->url, $this->repoDir)) {
		        if (!is_dir($this->repoDir)) {
		            throw new \RuntimeException('Failed to clone '.$this->url.' to read package information from it');
		        }
		        $this->io->writeError('<error>Failed to update '.$this->url.', package information from this repository may be outdated</error>');
		    }

		    $cacheUrl = $this->url;
		}

		$this->getTags();
		$this->getBranches();

		$this->cache = new Cache($this->io, $this->config->get('cache-repo-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', Url::sanitize($cacheUrl)));
		$this->cache->setReadOnly($this->config->get('cache-read-only'));
	}


	/**
	 * @inheritDoc
	 */
	public function getRootIdentifier(): string
	{
		if (null === $this->rootIdentifier) {
		    $this->rootIdentifier = 'master';

		    $gitUtil = new GitUtil($this->io, $this->config, $this->process, new Filesystem());
		    if (!Filesystem::isLocalPath($this->url)) {
		        $defaultBranch = $gitUtil->getMirrorDefaultBranch($this->url, $this->repoDir, false);
		        if ($defaultBranch !== null) {
		            return $this->rootIdentifier = $defaultBranch;
		        }
		    }

		    // select currently checked out branch as default branch
		    $this->process->execute('git branch --no-color', $output, $this->repoDir);
		    $branches = $this->process->splitLines($output);
		    if (!in_array('* master', $branches)) {
		        foreach ($branches as $branch) {
		            if ($branch && Preg::isMatchStrictGroups('{^\* +(\S+)}', $branch, $match)) {
		                $this->rootIdentifier = $match[1];
		                break;
		            }
		        }
		    }
		}

		return $this->rootIdentifier;
	}


	/**
	 * @inheritDoc
	 */
	public function getUrl(): string
	{
		return $this->url;
	}


	/**
	 * @inheritDoc
	 */
	public function getSource(string $identifier): array
	{
		return ['type' => 'git', 'url' => $this->getUrl(), 'reference' => $identifier];
	}


	/**
	 * @inheritDoc
	 */
	public function getDist(string $identifier): ?array
	{
		return null;
	}


	/**
	 * @inheritDoc
	 */
	public function getFileContent(string $file, string $identifier): ?string
	{
		if (isset($identifier[0]) && $identifier[0] === '-') {
		    throw new \RuntimeException('Invalid git identifier detected. Identifier must not start with a -, given: ' . $identifier);
		}

		$resource = sprintf('%s:%s', ProcessExecutor::escape($identifier), ProcessExecutor::escape($file));
		$this->process->execute(sprintf('git show %s', $resource), $content, $this->repoDir);

		if (!trim($content)) {
		    return null;
		}

		return $content;
	}


	/**
	 * @inheritDoc
	 */
	public function getChangeDate(string $identifier): ?\DateTimeImmutable
	{
		$this->process->execute(sprintf(
		    'git -c log.showSignature=false log -1 --format=%%at %s',
		    ProcessExecutor::escape($identifier)
		), $output, $this->repoDir);

		return new \DateTimeImmutable('@'.trim($output), new \DateTimeZone('UTC'));
	}


	/**
	 * @inheritDoc
	 */
	public function getTags(): array
	{
		if (null === $this->tags) {
		    $this->tags = [];

		    $this->process->execute('git show-ref --tags --dereference', $output, $this->repoDir);
		    foreach ($output = $this->process->splitLines($output) as $tag) {
		        if ($tag && Preg::isMatch('{^([a-f0-9]{40}) refs/tags/(\S+?)(\^\{\})?$}', $tag, $match)) {
		            $this->tags[$match[2]] = (string) $match[1];
		        }
		    }
		}

		return $this->tags;
	}


	/**
	 * @inheritDoc
	 */
	public function getBranches(): array
	{
		if (null === $this->branches) {
		    $branches = [];

		    $this->process->execute('git branch --no-color --no-abbrev -v', $output, $this->repoDir);
		    foreach ($this->process->splitLines($output) as $branch) {
		        if ($branch && !Preg::isMatch('{^ *[^/]+/HEAD }', $branch)) {
		            if (Preg::isMatchStrictGroups('{^(?:\* )? *(\S+) *([a-f0-9]+)(?: .*)?$}', $branch, $match) && $match[1][0] !== '-') {
		                $branches[$match[1]] = $match[2];
		            }
		        }
		    }

		    $this->branches = $branches;
		}

		return $this->branches;
	}


	/**
	 * @inheritDoc
	 */
	public static function supports(IOInterface $io, Config $config, string $url, bool $deep = false): bool
	{
		if (Preg::isMatch('#(^git://|\.git/?$|git(?:olite)?@|//git\.|//github.com/)#i', $url)) {
		    return true;
		}

		// local filesystem
		if (Filesystem::isLocalPath($url)) {
		    $url = Filesystem::getPlatformPath($url);
		    if (!is_dir($url)) {
		        return false;
		    }

		    $process = new ProcessExecutor($io);
		    // check whether there is a git repo in that path
		    if ($process->execute('git tag', $output, $url) === 0) {
		        return true;
		    }
		}

		if (!$deep) {
		    return false;
		}

		$gitUtil = new GitUtil($io, $config, new ProcessExecutor($io), new Filesystem());
		GitUtil::cleanEnv();

		try {
		    $gitUtil->runCommand(static function ($url): string {
		        return 'git ls-remote --heads -- ' . ProcessExecutor::escape($url);
		    }, $url, sys_get_temp_dir());
		} catch (\RuntimeException $e) {
		    return false;
		}

		return true;
	}
}
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