<?php

/**
 * setup.php -- Sent Subfolders Setup File
 *
 * This is a standard SquirrelMail 1.2 API for plugins.
 *
 * @copyright 1999-2021 The SquirrelMail Project Team
 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
 * @version $Id$
 * @package plugins
 * @subpackage sent_subfolders
 */

define('SMPREF_SENT_SUBFOLDERS_DISABLED',  0);
define('SMPREF_SENT_SUBFOLDERS_YEARLY',    1);
define('SMPREF_SENT_SUBFOLDERS_QUARTERLY', 2);
define('SMPREF_SENT_SUBFOLDERS_MONTHLY',   3);
define('SMOPT_GRP_SENT_SUBFOLDERS','SENT_SUBFOLDERS');

function sent_subfolders_check_handleAsSent_do($mailbox) {

    global $handleAsSent_result, $data_dir, $username, $sent_folder;

    // don't need to bother if it's already special
    if ($handleAsSent_result) return;

    sqgetGlobalVar('delimiter', $delimiter, SQ_SESSION);

    $use_sent_subfolders = getPref($data_dir, $username,
                                   'use_sent_subfolders', SMPREF_OFF);
    $sent_subfolders_base = getPref($data_dir, $username,
                                    'sent_subfolders_base', $sent_folder);

    /* Only check the folder string if we have been passed a mailbox. */
    if ($use_sent_subfolders && !empty($mailbox)) {
        /* Chop up the folder strings as needed. */
        $base_str = $sent_subfolders_base . $delimiter;
        $mbox_str = substr($mailbox, 0, strlen($base_str));

        /* Perform the comparison. */
        $handleAsSent_result = ( ($base_str == $mbox_str)
                              || ($sent_subfolders_base == $mailbox) );
    }
}

/**
 * Adds sent_subfolders options in folder preferences
 */
function sent_subfolders_optpage_loadhook_folders_do() {

    global $data_dir, $username, $optpage_data, $imapServerAddress,
           $imapPort, $imap_stream_options, $show_contain_subfolders_option, $sent_folder;

    /* Get some imap data we need later. */
    $imapConnection = sqimap_login($username, false, $imapServerAddress, $imapPort, 0, $imap_stream_options);
    $boxes = sqimap_mailbox_list($imapConnection);
    sqimap_logout($imapConnection);

    /* Load the Sent Subfolder Options into an array. */
    $optgrp = _("Sent Subfolders Options");
    $optvals = array();

    global $sent_subfolders_setting;
    $sent_subfolders_setting = getPref($data_dir, $username,
                                       'sent_subfolders_setting',
                                       SMPREF_SENT_SUBFOLDERS_DISABLED);
    $optvals[] = array(
        'name'    => 'sent_subfolders_setting',
        'caption' => _("Use Sent Subfolders"),
        'type'    => SMOPT_TYPE_STRLIST,
        'refresh' => SMOPT_REFRESH_FOLDERLIST,
        'posvals' => array(SMPREF_SENT_SUBFOLDERS_DISABLED  => _("Disabled"),
                        SMPREF_SENT_SUBFOLDERS_MONTHLY   => _("Monthly"),
                        SMPREF_SENT_SUBFOLDERS_QUARTERLY => _("Quarterly"),
                        SMPREF_SENT_SUBFOLDERS_YEARLY    => _("Yearly")),
        'save'    => 'save_option_sent_subfolders_setting'
    );

    $filtered_folders=array_filter($boxes, "filter_folders");
    $sent_subfolders_base_values = array('whatever'=>$filtered_folders);

    global $sent_subfolders_base;
    $sent_subfolders_base = getPref($data_dir, $username,
                                    'sent_subfolders_base', $sent_folder);
    $optvals[] = array(
        'name'    => 'sent_subfolders_base',
        'caption' => _("Base Sent Folder"),
        'type'    => SMOPT_TYPE_FLDRLIST,
        'refresh' => SMOPT_REFRESH_FOLDERLIST,
        'posvals' => $sent_subfolders_base_values,
        'folder_filter' => 'noinferiors',
        'save'    => 'save_option_sent_subfolders_base'
    );

    if ($show_contain_subfolders_option) {
        $optvals[] = array(
            'name' => 'sent_subfolders_warning',
            'caption' => _("Warning"),
            'type' => SMOPT_TYPE_COMMENT,
            'comment' => _("There are some restrictions in Sent Subfolder options.")
            );
    }

    /* Add our option data to the global array. */
    $optpage_data['grps'][SMOPT_GRP_SENT_SUBFOLDERS] = $optgrp;
    $optpage_data['vals'][SMOPT_GRP_SENT_SUBFOLDERS] = $optvals;
}

/**
 * Defines folder filtering rules
 *
 * Callback function that should exclude some folders from folder listing.
 * @param array $fldr list of folders. See sqimap_mailbox_list
 * @return boolean returns true, if folder has to included in folder listing
 * @access private
 */
function filter_folders($fldr) {
    return strtolower($fldr['unformatted'])!='inbox';
}

/**
 * Saves sent_subfolder_options
 */
function save_option_sent_subfolders_setting($option) {
    global $data_dir, $username;

    /* Set use_sent_subfolders as either on or off. */
    if ($option->new_value == SMPREF_SENT_SUBFOLDERS_DISABLED) {
        setPref($data_dir, $username, 'use_sent_subfolders', SMPREF_OFF);
    } else {
        setPref($data_dir, $username, 'use_sent_subfolders', SMPREF_ON);
        setPref($data_dir, $username, 'move_to_sent', SMPREF_ON);
        $check_sent_subfolders_base = getPref($data_dir, $username, 'sent_subfolders_base', '');
        if ($check_sent_subfolders_base === '') {
            setPref($data_dir, $username, 'sent_subfolders_base', $sent_subfolders_base);
        }
    }

    /* Now just save the option as normal. */
    save_option($option);
}

/**
 * Update the folder settings/auto-create new subfolder
 */
function save_option_sent_subfolders_base($option) {
    // first save the option as normal
    save_option($option);

    // now update folder settings and auto-create first subfolder if needed
    sent_subfolders_update_sentfolder_do();
}

/**
 * Update sent_subfolders settings
 *
 * function updates default sent folder value and
 * creates required imap folders
 */
function sent_subfolders_update_sentfolder_do() {
    global $sent_folder, $username,
           $data_dir, $imapServerAddress, $imapPort,
           $imap_stream_options, $move_to_sent;

    sqgetGlobalVar('delimiter', $delimiter, SQ_SESSION);

    $use_sent_subfolders = getPref($data_dir, $username,
                                   'use_sent_subfolders', SMPREF_OFF);
    $sent_subfolders_setting = getPref($data_dir, $username,
                                       'sent_subfolders_setting',
                                       SMPREF_SENT_SUBFOLDERS_DISABLED);
    $sent_subfolders_base = getPref($data_dir, $username,
                                    'sent_subfolders_base', $sent_folder);

    if ($use_sent_subfolders || $move_to_sent) {
        $year = date('Y');
        $month = date('m');
        $quarter = sent_subfolder_getQuarter($month);

        /**
         * Regarding the structure we've got three main possibilities.
         * One sent holder. level 0.
         * Multiple year holders with messages in it. level 1.
         * Multiple year folders with holders in it. level 2.
         */

        switch ($sent_subfolders_setting) {
        case SMPREF_SENT_SUBFOLDERS_YEARLY:
            $level = 1;
            $sent_subfolder = $sent_subfolders_base . $delimiter
                            . $year;
            break;
        case SMPREF_SENT_SUBFOLDERS_QUARTERLY:
            $level = 2;
            $sent_subfolder = $sent_subfolders_base . $delimiter
                            . $year
                            . $delimiter . $quarter;
            $year_folder = $sent_subfolders_base . $delimiter
                            . $year;
            break;
        case SMPREF_SENT_SUBFOLDERS_MONTHLY:
            $level = 2;
            $sent_subfolder = $sent_subfolders_base . $delimiter
                            . $year
                            . $delimiter . $month;
            $year_folder = $sent_subfolders_base. $delimiter . $year;
            break;
        case SMPREF_SENT_SUBFOLDERS_DISABLED:
        default:
            $level = 0;
            $sent_subfolder = $sent_folder;
            $year_folder = $sent_folder;
        }

        /* If this folder is NOT the current sent folder, update stuff. */
        if ($sent_subfolder != $sent_folder) {
            /* Auto-create folders, if they do not yet exist. */
            if ($sent_subfolder != 'none') {
                /* Create the imap connection. */
                $ic = sqimap_login($username, false, $imapServerAddress, $imapPort, 10, $imap_stream_options);

                $boxes = false;
                /**
                 * If sent_subfolder can't store messages (noselect) ||
                 * year_folder can't store subfolders (noinferiors) in level=2 setup ||
                 * subfolder_base can't store subfolders (noinferiors), setup is broken
                 */
                if (sqimap_mailbox_is_noselect($ic,$sent_subfolder,$boxes) ||
                    ($level==2 && sqimap_mailbox_is_noinferiors($ic,$year_folder,$boxes)) ||
                     sqimap_mailbox_is_noinferiors($ic,$sent_subfolders_base,$boxes)) {
                    error_box(_("Sent subfolders options are misconfigured."));
                } else {
                    if ($level==2) {
                        /* Auto-create the year folder, if it does not yet exist. */
                        if (!sqimap_mailbox_exists($ic, $year_folder)) {
                            sqimap_mailbox_create($ic, $year_folder, 'noselect');
                            // TODO: safety check for imap servers that can't create subfolders

                        } else if (!sqimap_mailbox_is_subscribed($ic, $year_folder)) {
                            sqimap_subscribe($ic, $year_folder);
                        }
                    }

                    /* Auto-create the subfolder, if it does not yet exist. */
                    if (!sqimap_mailbox_exists($ic, $sent_subfolder)) {
                        sqimap_mailbox_create($ic, $sent_subfolder, '');
                    } else if (!sqimap_mailbox_is_subscribed($ic, $sent_subfolder)) {
                        sqimap_subscribe($ic, $sent_subfolder);
                    }
                    /* Update sent_folder setting in prefs only if the base
                       subfolders setting is not the same as the normal sent
                       folder...  otherwise, it is quite misleading to the user.
                       If the sent folder is the same as the subfolders base, it's
                       OK to leave the sent folder as is.
                       The sent_folder setting itself needs to be the actual
                       subfolder (not the base) for proper functionality */
                    if ($sent_subfolders_base != $sent_folder) {
                        setPref($data_dir, $username, 'sent_folder', $sent_subfolders_base);
                        setPref($data_dir, $username, 'move_to_sent', SMPREF_ON);
                        setPref($data_dir, $username, 'translate_special_folders', SMPREF_OFF);
                    }
                    $sent_folder = $sent_subfolder;
                    $move_to_sent = SMPREF_ON;
                }
                /* Close the imap connection. */
                sqimap_logout($ic);
            }

        }
    }
}

/**
 * Sets quarter subfolder names
 *
 * @param string $month numeric month
 * @return string quarter name (Q + number)
 */
function sent_subfolder_getQuarter($month) {
    switch ($month) {
        case '01':
        case '02':
        case '03':
            $result = '1';
            break;
        case '04':
        case '05':
        case '06':
            $result = '2';
            break;
        case '07':
        case '08':
        case '09':
            $result = '3';
            break;
        case '10':
        case '11':
        case '12':
            $result = '4';
            break;
        default:
            $result = 'ERR';
    }

    /* Return the current quarter. */
    return ('Q' . $result);
}

/**
 * detects if mailbox is part of sent_subfolders
 *
 * @param string $mb imap folder name
 * @return boolean 1 - is part of sent_subfolders, 0 - is not part of sent_subfolders
 */
function sent_subfolders_special_mailbox_do($mb) {
    global $data_dir, $username, $sent_folder;

    sqgetGlobalVar('delimiter', $delimiter, SQ_SESSION);

    $use_sent_subfolders = getPref($data_dir, $username, 'use_sent_subfolders', SMPREF_OFF);

    $sent_subfolders_base = getPref($data_dir, $username, 'sent_subfolders_base', $sent_folder);

    /**
     * If sent_subfolders are used and mailbox is equal to subfolder base 
     * or mailbox matches subfolder base + delimiter.
     */
    if ($use_sent_subfolders == SMPREF_ON &&
    ($mb == $sent_subfolders_base || stristr($mb,$sent_subfolders_base . $delimiter) ) ) {
        return 1;
    }
    return 0;
}