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<?php

/**
 +-----------------------------------------------------------------------+
 | This file is part of the Roundcube Webmail client                     |
 |                                                                       |
 | Copyright (C) The Roundcube Dev Team                                  |
 | Copyright (C) Kolab Systems AG                                        |
 |                                                                       |
 | Licensed under the GNU General Public License version 3 or            |
 | any later version with exceptions for skins & plugins.                |
 | See the README file for a full license statement.                     |
 |                                                                       |
 | PURPOSE:                                                              |
 |   SORT/SEARCH/ESEARCH response handler                                |
 +-----------------------------------------------------------------------+
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 | Author: Aleksander Machniak <alec@alec.pl>                            |
 +-----------------------------------------------------------------------+
*/

/**
 * Class for accessing IMAP's SORT/SEARCH/ESEARCH result
 *
 * @package    Framework
 * @subpackage Storage
 */
class rcube_result_index
{
    public $incomplete = false;

    protected $raw_data;
    protected $mailbox;
    protected $meta   = [];
    protected $params = [];
    protected $order  = 'ASC';

    const SEPARATOR_ELEMENT = ' ';


    /**
     * Object constructor.
     */
    public function __construct($mailbox = null, $data = null, $order = null)
    {
        $this->mailbox = $mailbox;
        $this->order   = $order == 'DESC' ? 'DESC' : 'ASC';
        $this->init($data);
    }

    /**
     * Initializes object with SORT command response
     *
     * @param string $data IMAP response string
     */
    public function init($data = null)
    {
        $this->meta = [];

        $data = explode('*', (string)$data);

        // ...skip unilateral untagged server responses
        for ($i=0, $len=count($data); $i<$len; $i++) {
            $data_item = &$data[$i];
            if (preg_match('/^ SORT/i', $data_item)) {
                // valid response, initialize raw_data for is_error()
                $this->raw_data = '';
                $data_item = substr($data_item, 5);
                break;
            }
            else if (preg_match('/^ (E?SEARCH)/i', $data_item, $m)) {
                // valid response, initialize raw_data for is_error()
                $this->raw_data = '';
                $data_item = substr($data_item, strlen($m[0]));

                if (strtoupper($m[1]) == 'ESEARCH') {
                    $data_item = trim($data_item);
                    // remove MODSEQ response
                    if (preg_match('/\(MODSEQ ([0-9]+)\)$/i', $data_item, $m)) {
                        $data_item = substr($data_item, 0, -strlen($m[0]));
                        $this->params['MODSEQ'] = $m[1];
                    }
                    // remove TAG response part
                    if (preg_match('/^\(TAG ["a-z0-9]+\)\s*/i', $data_item, $m)) {
                        $data_item = substr($data_item, strlen($m[0]));
                    }
                    // remove UID
                    $data_item = preg_replace('/^UID\s*/i', '', $data_item);

                    // ESEARCH parameters
                    while (preg_match('/^([a-z]+) ([0-9:,]+)\s*/i', $data_item, $m)) {
                        $param = strtoupper($m[1]);
                        $value = $m[2];

                        $this->params[$param] = $value;
                        $data_item = substr($data_item, strlen($m[0]));

                        if (in_array($param, ['COUNT', 'MIN', 'MAX'])) {
                            $this->meta[strtolower($param)] = (int) $value;
                        }
                    }

// @TODO: Implement compression using compressMessageSet() in __sleep() and __wakeup() ?
// @TODO: work with compressed result?!
                    if (isset($this->params['ALL'])) {
                        $data_item = implode(self::SEPARATOR_ELEMENT,
                            rcube_imap_generic::uncompressMessageSet($this->params['ALL']));
                    }
                }

                break;
            }

            unset($data[$i]);
        }

        $data = array_filter($data);

        if (empty($data)) {
            return;
        }

        $data = array_first($data);
        $data = trim($data);
        $data = preg_replace('/[\r\n]/', '', $data);
        $data = preg_replace('/\s+/', ' ', $data);

        $this->raw_data = $data;
    }

    /**
     * Checks the result from IMAP command
     *
     * @return bool True if the result is an error, False otherwise
     */
    public function is_error()
    {
        return $this->raw_data === null;
    }

    /**
     * Checks if the result is empty
     *
     * @return bool True if the result is empty, False otherwise
     */
    public function is_empty()
    {
        return empty($this->raw_data)
            && empty($this->meta['max']) && empty($this->meta['min']) && empty($this->meta['count']);
    }

    /**
     * Returns number of elements in the result
     *
     * @return int Number of elements
     */
    public function count()
    {
        if (isset($this->meta['count'])) {
            return $this->meta['count'];
        }

        if (empty($this->raw_data)) {
            $this->meta['count']  = 0;
            $this->meta['length'] = 0;
        }
        else {
            $this->meta['count'] = 1 + substr_count($this->raw_data, self::SEPARATOR_ELEMENT);
        }

        return $this->meta['count'];
    }

    /**
     * Returns number of elements in the result.
     * Alias for count() for compatibility with rcube_result_thread
     *
     * @return int Number of elements
     */
    public function count_messages()
    {
        return $this->count();
    }

    /**
     * Returns maximal message identifier in the result
     *
     * @return int|null Maximal message identifier
     */
    public function max()
    {
        if ($this->is_empty()) {
            return null;
        }

        if (!isset($this->meta['max'])) {
            $this->meta['max'] = null;
            $all = $this->get();
            if (!empty($all)) {
                $this->meta['max'] = (int) max($all);
            }
        }

        return $this->meta['max'];
    }

    /**
     * Returns minimal message identifier in the result
     *
     * @return int|null Minimal message identifier
     */
    public function min()
    {
        if ($this->is_empty()) {
            return null;
        }

        if (!isset($this->meta['min'])) {
            $this->meta['min'] = null;
            $all = $this->get();
            if (!empty($all)) {
                $this->meta['min'] = (int) min($all);
            }
        }

        return $this->meta['min'];
    }

    /**
     * Slices data set.
     *
     * @param int $offset Offset (as for PHP's array_slice())
     * @param int $length Number of elements (as for PHP's array_slice())
     */
    public function slice($offset, $length)
    {
        $data = $this->get();
        $data = array_slice($data, $offset, $length);

        $this->meta          = [];
        $this->meta['count'] = count($data);
        $this->raw_data      = implode(self::SEPARATOR_ELEMENT, $data);
    }

    /**
     * Filters data set. Removes elements not listed in $ids list.
     *
     * @param array $ids List of IDs to remove.
     */
    public function filter($ids = [])
    {
        $data = $this->get();
        $data = array_intersect($data, $ids);

        $this->meta          = [];
        $this->meta['count'] = count($data);
        $this->raw_data      = implode(self::SEPARATOR_ELEMENT, $data);
    }

    /**
     * Reverts order of elements in the result
     */
    public function revert()
    {
        $this->order = $this->order == 'ASC' ? 'DESC' : 'ASC';

        if (empty($this->raw_data)) {
            return;
        }

        $data = $this->get();
        $data = array_reverse($data);
        $this->raw_data = implode(self::SEPARATOR_ELEMENT, $data);

        $this->meta['pos'] = [];
    }

    /**
     * Check if the given message ID exists in the object
     *
     * @param int  $msgid     Message ID
     * @param bool $get_index When enabled element's index will be returned.
     *                        Elements are indexed starting with 0
     *
     * @return mixed False if message ID doesn't exist, True if exists or
     *               index of the element if $get_index=true
     */
    public function exists($msgid, $get_index = false)
    {
        if (empty($this->raw_data)) {
            return false;
        }

        $msgid = (int) $msgid;
        $begin = implode('|', ['^', preg_quote(self::SEPARATOR_ELEMENT, '/')]);
        $end   = implode('|', ['$', preg_quote(self::SEPARATOR_ELEMENT, '/')]);

        if (preg_match("/($begin)$msgid($end)/", $this->raw_data, $m,
            $get_index ? PREG_OFFSET_CAPTURE : 0)
        ) {
            if ($get_index) {
                $idx = 0;
                if (!empty($m[0][1])) {
                    $idx = 1 + substr_count($this->raw_data, self::SEPARATOR_ELEMENT, 0, $m[0][1]);
                }
                // cache position of this element, so we can use it in get_element()
                $this->meta['pos'][$idx] = (int)$m[0][1];

                return $idx;
            }

            return true;
        }

        return false;
    }

    /**
     * Return all messages in the result.
     *
     * @return array List of message IDs
     */
    public function get()
    {
        if (empty($this->raw_data)) {
            return [];
        }

        return explode(self::SEPARATOR_ELEMENT, $this->raw_data);
    }

    /**
     * Return all messages in the result.
     *
     * @return array List of message IDs
     */
    public function get_compressed()
    {
        if (empty($this->raw_data)) {
            return '';
        }

        return rcube_imap_generic::compressMessageSet($this->get());
    }

    /**
     * Return result element at specified index
     *
     * @param int|string  $index  Element's index or "FIRST" or "LAST"
     *
     * @return int|null Element value
     */
    public function get_element($index)
    {
        if (empty($this->raw_data)) {
            return null;
        }

        $count = $this->count();

        // first element
        if ($index === 0 || $index === '0' || $index === 'FIRST') {
            $pos = strpos($this->raw_data, self::SEPARATOR_ELEMENT);
            if ($pos === false) {
                $result = (int) $this->raw_data;
            }
            else {
                $result = (int) substr($this->raw_data, 0, $pos);
            }

            return $result;
        }

        // last element
        if ($index === 'LAST' || $index == $count-1) {
            $pos = strrpos($this->raw_data, self::SEPARATOR_ELEMENT);
            if ($pos === false) {
                $result = (int) $this->raw_data;
            }
            else {
                $result = (int) substr($this->raw_data, $pos);
            }

            return $result;
        }

        // do we know the position of the element or the neighbour of it?
        if (!empty($this->meta['pos'])) {
            if (isset($this->meta['pos'][$index])) {
                $pos = $this->meta['pos'][$index];
            }
            else if (isset($this->meta['pos'][$index-1])) {
                $pos = strpos($this->raw_data, self::SEPARATOR_ELEMENT,
                    $this->meta['pos'][$index-1] + 1);
            }
            else if (isset($this->meta['pos'][$index+1])) {
                $pos = strrpos($this->raw_data, self::SEPARATOR_ELEMENT,
                    $this->meta['pos'][$index+1] - $this->length() - 1);
            }

            if (isset($pos) && preg_match('/([0-9]+)/', $this->raw_data, $m, 0, $pos)) {
                return (int) $m[1];
            }
        }

        // Finally use less effective method
        $data = explode(self::SEPARATOR_ELEMENT, $this->raw_data);

        return (int) $data[$index];
    }

    /**
     * Returns response parameters, e.g. ESEARCH's MIN/MAX/COUNT/ALL/MODSEQ
     * or internal data e.g. MAILBOX, ORDER
     *
     * @param ?string $param Parameter name
     *
     * @return array|string Response parameters or parameter value
     */
    public function get_parameters($param = null)
    {
        $params            = $this->params;
        $params['MAILBOX'] = $this->mailbox;
        $params['ORDER']   = $this->order;

        if ($param !== null) {
            return $params[$param] ?? null;
        }

        return $params;
    }

    /**
     * Returns length of internal data representation
     *
     * @return int Data length
     */
    protected function length()
    {
        if (!isset($this->meta['length'])) {
            $this->meta['length'] = strlen($this->raw_data);
        }

        return $this->meta['length'];
    }
}