<?php

/**
 * setup.php -- Sent Subfolders Setup File
 *
 * This is a standard SquirrelMail 1.2 API for plugins.
 *
 * @copyright &copy; 1999-2007 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');

/**
 * Adds plugin to SquirrelMail's hooks
 */
function squirrelmail_plugin_init_sent_subfolders() {
    /* Standard initialization API. */
    global $squirrelmail_plugin_hooks;

    /* The hooks to make the sent subfolders display correctly. */
    $squirrelmail_plugin_hooks
    ['check_handleAsSent_result']['sent_subfolders'] =
        'sent_subfolders_check_handleAsSent';

    /* The hooks to automatically update sent subfolders. */
    $squirrelmail_plugin_hooks
    ['left_main_before']['sent_subfolders'] =
        'sent_subfolders_update_sentfolder';

    $squirrelmail_plugin_hooks
    ['compose_send']['sent_subfolders'] =
        'sent_subfolders_update_sentfolder';

    /* The hook to load the sent subfolders prefs. */
    $squirrelmail_plugin_hooks
    ['loading_prefs']['sent_subfolders'] =
        'sent_subfolders_load_prefs';

    /* The hooks to handle sent subfolders options. */
    $squirrelmail_plugin_hooks
    ['optpage_loadhook_folder']['sent_subfolders'] =
        'sent_subfolders_optpage_loadhook_folders';

    /* mark base sent folder as special mailbox */
    $squirrelmail_plugin_hooks
    ['special_mailbox']['sent_subfolders'] =
        'sent_subfolders_special_mailbox';
}

function sent_subfolders_check_handleAsSent() {
    global $handleAsSent_result, $sent_subfolders_base,
           $use_sent_subfolders;

    // FIXME: hardcoded folder
    $sent_subfolders_base = 'INBOX.Sent';
    $args = func_get_arg(0);
    sqgetGlobalVar('delimiter', $delimiter, SQ_SESSION);

    /* Only check the folder string if we have been passed a mailbox. */
    if ($use_sent_subfolders && (count($args) > 1)) {
        /* Chop up the folder strings as needed. */
        $base_str = $sent_subfolders_base . $delimiter;
        $mbox_str = substr($args[1], 0, strlen($base_str));

        /* Perform the comparison. */
        $handleAsSent_result =
            ( $handleAsSent_result
            || ($base_str == $mbox_str)
            || ($sent_subfolders_base == $args[1])
            );
    }
}

/**
 * Loads sent_subfolders settings
 */
function sent_subfolders_load_prefs() {
    global $use_sent_subfolders, $data_dir, $username,
           $sent_subfolders_setting, $sent_subfolders_base;

    $use_sent_subfolders = getPref
    ($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', SMPREF_NONE);
}

/**
 * Adds sent_subfolders options in folder preferences
 */
function sent_subfolders_optpage_loadhook_folders() {
    global $username, $optpage_data, $imapServerAddress, $imapPort, $show_contain_subfolders_option;

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

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

    $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);

    $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'
    );

    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, $use_sent_subfolders;

    /* 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);
    }

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

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

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

    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.
         */
        $cnd_delimiter = $delimiter;

        switch ($sent_subfolders_setting) {
        case SMPREF_SENT_SUBFOLDERS_YEARLY:
            $level = 1;
            $sent_subfolder = $sent_subfolders_base . $cnd_delimiter
                            . $year;
            break;
        case SMPREF_SENT_SUBFOLDERS_QUARTERLY:
            $level = 2;
            $sent_subfolder = $sent_subfolders_base . $cnd_delimiter
                            . $year
                            . $delimiter . $quarter;
            $year_folder = $sent_subfolders_base . $cnd_delimiter
                            . $year;
            break;
        case SMPREF_SENT_SUBFOLDERS_MONTHLY:
            $level = 2;
            $sent_subfolder = $sent_subfolders_base . $cnd_delimiter
                            . $year
                            . $delimiter . $month;
            $year_folder = $sent_subfolders_base. $cnd_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);

                $boxes = false;
                /**
                 * If sent_subfolder can't store messages (noselect) ||
                 * year_folder can't store subfolders (noinferiors) in level=2 setup ||
                 * subfolder_base can't store subfolders (noinferiors), setup is broken
                 */
                if (sqimap_mailbox_is_noselect($ic,$sent_subfolder,$boxes) ||
                    ($level==2 && sqimap_mailbox_is_noinferiors($ic,$year_folder,$boxes)) ||
                     sqimap_mailbox_is_noinferiors($ic,$sent_subfolders_base,$boxes)) {
                    error_box(_("Sent Subfolders plugin is misconfigured."));
                } else {
                    if ($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, $sent_subfolder);
                    }
                    /* Update sent_folder setting. */
                    //setPref($data_dir, $username, 'sent_folder', $sent_subfolder);
                    //setPref($data_dir, $username, 'move_to_sent', SMPREF_ON);
                    $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 $mb imap folder name
 * @return boolean 1 - is part of sent_subfolders, 0 - is not part of sent_subfolders
 */
function sent_subfolders_special_mailbox($mb) {
    global $data_dir, $username, $delimiter;

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

    /**
     * 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;
}