<?php
/* For licensing terms, see /license.txt */
/**
 * Unfinished script: at this point it just looks at the user
 * personal folder's creation date to determine if the date is
 * within range. DO NOT USE AS IS.
 * This script removes old "private" files uploaded by users in
 * their "my_files" folder in app/upload/users/
 * It uses parameters in order (all mandatory but the last one).
 * Delete the exit; statement at line 13.
 * This script should be located inside the tests/scripts/ folder to work.
 * @author Yannick Warnier <yannick.warnier@beeznest.com>
 */
exit;
require __DIR__.'/../../main/inc/global.inc.php';
$simulate = false;

// Process script parameters
if (PHP_SAPI !== 'cli') {
    die('This script can only be executed from the command line');
}

if (!empty($argv[1]) && $argv[1] == '--from') {
    $from = $argv[2];
}
if (!empty($argv[3]) && $argv[3] == '--until') {
    $until = $argv[4];
}
if (!empty($argv[5]) && $argv[5] == '-s') {
    $simulate = true;
    echo "Simulation mode is enabled".PHP_EOL;
}
if (empty($from) or empty($until)) {
    echo PHP_EOL."Usage: sudo php ".basename(__FILE__)." [options]".PHP_EOL;
    echo "Where [options] can be ".PHP_EOL;
    echo "  --from yyyy-mm-dd    Date from which the content should be removed (e.g. 2017-08-31)".PHP_EOL.PHP_EOL;
    echo "  --until yyyy-mm-dd   Date up to which the content should be removed (e.g. 2020-08-31)".PHP_EOL.PHP_EOL;
    echo "  -s                   (optional) Simulate execution - Do not delete anything, just show numbers".PHP_EOL.PHP_EOL;
    die('Please make sure --from and --until are defined.');
}

echo "About to delete old personal files created between $from and $until.".PHP_EOL;

echo deletePersonalFiles($from, $until, $simulate);

/**
 * Delete all data from the tracking tables between the given dates and return a log string.
 * @param string $from  'yyyy-mm-dd' format date from which to start deleting
 * @param string $until 'yyyy-mm-dd' format date until which to delete
 * @param bool   $simulate True if we only want to simulate the deletion and collect data
 * @return string
 */
function deletePersonalFiles(string $from, string $until, bool $simulate): string
{
    $log = '';
    $size = 0;
    if ($simulate) {
        $log .= 'Simulation mode ON'.PHP_EOL;
    }
    $table = Database::get_main_table(TABLE_MAIN_USER);
    // Get the list of sessions where access_end_date is within the given range
    $users = Database::select(
        'id',
        $table,
        [
            'where' => 'status = 5',
        ]
    );
    $fromTimestamp = api_strtotime($from);
    $untilTimestamp = api_strtotime($until);
    $log .= 'Found '.count($users).' non-privileged users to check'.PHP_EOL;
    foreach ($users as $user) {
        $path = UserManager::getUserPathById($user['id'], 'system');
        if (is_dir($path)) {
            $folderCreationDate = filectime($path);
            $log .= $path.' was created on '.date('Y-m-d', $folderCreationDate).PHP_EOL;
            if ($folderCreationDate > $fromTimestamp and $folderCreationDate <= $untilTimestamp) {
                $log .= 'Folder '.$path.' matches creation time span. Deleting...'.PHP_EOL;
                $size += folderSize($path);
                if (!$simulate) {
                    my_delete($path);
                }
            }
        }
    }
    $log .= 'Deleted '.$size.'B user files in total.'.PHP_EOL;

    return $log;
}

function folderSize($dir)
{
    $size = 0;
    $contents = glob(rtrim($dir, '/').'/*', GLOB_NOSORT);
    foreach ($contents as $contents_value) {
        if (is_file($contents_value)) {
            $size += filesize($contents_value);
        } else {
            $size += folderSize($contents_value);
        }
    }

    return $size;
}