<?php

namespace Sabre\DAV\Locks\Backend;

use Sabre\DAV\Locks\LockInfo;

/**
 * This Locks backend stores all locking information in a single file.
 *
 * Note that this is not nearly as robust as a database. If you are considering
 * using this backend, keep in mind that the PDO backend can work with SqLite,
 * which is designed to be a good file-based database.
 *
 * It literally solves the problem this class solves as well, but much better.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class File extends AbstractBackend
{
    /**
     * The storage file.
     *
     * @var string
     */
    private $locksFile;

    /**
     * Constructor.
     *
     * @param string $locksFile path to file
     */
    public function __construct($locksFile)
    {
        $this->locksFile = $locksFile;
    }

    /**
     * Returns a list of Sabre\DAV\Locks\LockInfo objects.
     *
     * This method should return all the locks for a particular uri, including
     * locks that might be set on a parent uri.
     *
     * If returnChildLocks is set to true, this method should also look for
     * any locks in the subtree of the uri for locks.
     *
     * @param string $uri
     * @param bool   $returnChildLocks
     *
     * @return array
     */
    public function getLocks($uri, $returnChildLocks)
    {
        $newLocks = [];

        $locks = $this->getData();

        foreach ($locks as $lock) {
            if ($lock->uri === $uri ||
                //deep locks on parents
                (0 != $lock->depth && 0 === strpos($uri, $lock->uri.'/')) ||

                // locks on children
                ($returnChildLocks && (0 === strpos($lock->uri, $uri.'/')))) {
                $newLocks[] = $lock;
            }
        }

        // Checking if we can remove any of these locks
        foreach ($newLocks as $k => $lock) {
            if (time() > $lock->timeout + $lock->created) {
                unset($newLocks[$k]);
            }
        }

        return $newLocks;
    }

    /**
     * Locks a uri.
     *
     * @param string $uri
     *
     * @return bool
     */
    public function lock($uri, LockInfo $lockInfo)
    {
        // We're making the lock timeout 30 minutes
        $lockInfo->timeout = 1800;
        $lockInfo->created = time();
        $lockInfo->uri = $uri;

        $locks = $this->getData();

        foreach ($locks as $k => $lock) {
            if (
                ($lock->token == $lockInfo->token) ||
                (time() > $lock->timeout + $lock->created)
            ) {
                unset($locks[$k]);
            }
        }
        $locks[] = $lockInfo;
        $this->putData($locks);

        return true;
    }

    /**
     * Removes a lock from a uri.
     *
     * @param string $uri
     *
     * @return bool
     */
    public function unlock($uri, LockInfo $lockInfo)
    {
        $locks = $this->getData();
        foreach ($locks as $k => $lock) {
            if ($lock->token == $lockInfo->token) {
                unset($locks[$k]);
                $this->putData($locks);

                return true;
            }
        }

        return false;
    }

    /**
     * Loads the lockdata from the filesystem.
     *
     * @return array
     */
    protected function getData()
    {
        if (!file_exists($this->locksFile)) {
            return [];
        }

        // opening up the file, and creating a shared lock
        $handle = fopen($this->locksFile, 'r');
        flock($handle, LOCK_SH);

        // Reading data until the eof
        $data = stream_get_contents($handle);

        // We're all good
        flock($handle, LOCK_UN);
        fclose($handle);

        // Unserializing and checking if the resource file contains data for this file
        $data = unserialize($data);
        if (!$data) {
            return [];
        }

        return $data;
    }

    /**
     * Saves the lockdata.
     */
    protected function putData(array $newData)
    {
        // opening up the file, and creating an exclusive lock
        $handle = fopen($this->locksFile, 'a+');
        flock($handle, LOCK_EX);

        // We can only truncate and rewind once the lock is acquired.
        ftruncate($handle, 0);
        rewind($handle);

        fwrite($handle, serialize($newData));
        flock($handle, LOCK_UN);
        fclose($handle);
    }
}
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