<?php

if (!isset($_POST['host']) ||
    !isset($_POST['username']) ||
    !isset($_POST['password']) ||
    !isset($_POST['version']) ||
    !isset($_POST['datestart']) ||
    !isset($_POST['dateend']) ||
    !isset($_POST['fields'])
) {
    die('Required vars not passed.');
}
if (!isset($_POST['folder_id']) && !isset($_POST['mailbox'])) {
    die('Must pass either mailbox address or exchange id');
} elseif (isset($_POST['folder_id']) && isset($_POST['mailbox'])) {
    die('Cannot pass both mailbox address and exchange id');
}

$host = $_POST['host'];
$username = $_POST['username'];
$password = $_POST['password'];
$version = $_POST['version'];
$date_start = $_POST['datestart']; // unix timestamp
$date_end = $_POST['dateend']; // unix timestamp
$fields = unserialize($_POST['fields']);
$timezone_get = isset($_POST['timezoneget']) ? $_POST['timezoneget'] : false;
$timezone_set = isset($_POST['timezoneset']) ? $_POST['timezoneset'] : false;
$debug = isset($_REQUEST['debug']) ? true : false;

if (isset($_POST['folder_id'])) {
    $address_type = 'folder_id';
    $folder_id = $_POST['folder_id']; // must be unique exchange id. If unknown, use list.php to find out the exact folder id.
} else {
    $address_type = 'mailbox';
    $mailbox_address = $_POST['mailbox'];
}

if ($debug) {
    echo '<pre>
Host: '.$host.'
Username: '.$username.'
Password: '.$password.'
Version: '.$version.'
Date Start: '.$date_start.'
Date End: '.$date_end.'
'.($address_type == 'folder_id' ? 'Folder ID: '.$folder_id : 'Mailbox: '.$mailbox_address).'
Fields: '.var_export($fields, true).'
</pre>';
}

require_once 'php-ews-master/NTLMSoapClient.php';
require_once 'php-ews-master/NTLMSoapClient/Exchange.php';
require_once 'php-ews-master/ExchangeWebServices.php';
require_once 'php-ews-master/EWSType.php';
require_once 'php-ews-master/EWS_Exception.php';
require_once 'php-ews-master/EWSType/FindItemType.php';
require_once 'php-ews-master/EWSType/ItemQueryTraversalType.php';
require_once 'php-ews-master/EWSType/ItemResponseShapeType.php';
require_once 'php-ews-master/EWSType/DefaultShapeNamesType.php';
require_once 'php-ews-master/EWSType/CalendarViewType.php';
require_once 'php-ews-master/EWSType/NonEmptyArrayOfBaseFolderIdsType.php';
require_once 'php-ews-master/EWSType/DistinguishedFolderIdType.php';
require_once 'php-ews-master/EWSType/DistinguishedFolderIdNameType.php';
require_once 'php-ews-master/EWSType/EmailAddressType.php';
require_once 'php-ews-master/EWSType/FolderIdType.php';
require_once 'php-ews-master/EWSType/EmailAddress.php';
require_once 'php-ews-master/EWSType/FindFolderType.php';
require_once 'php-ews-master/EWSType/FolderQueryTraversalType.php';
require_once 'php-ews-master/EWSType/FolderResponseShapeType.php';
require_once 'php-ews-master/EWSType/IndexedPageViewType.php';


// Define EWS
$ews = new ExchangeWebServices($host, $username, $password, $version);

// Set init class
$request = new EWSType_FindItemType();
// Use this to search only the items in the parent directory in question or use ::SOFT_DELETED
// to identify "soft deleted" items, i.e. not visible and not in the trash can.
$request->Traversal = EWSType_ItemQueryTraversalType::SHALLOW;

// This identifies the set of properties to return in an item or folder response
$request->ItemShape = new EWSType_ItemResponseShapeType();
$request->ItemShape->BaseShape = EWSType_DefaultShapeNamesType::ALL_PROPERTIES;

// Define the timeframe to load calendar items
$request->CalendarView = new EWSType_CalendarViewType();
$request->CalendarView->StartDate = date('c', $date_start); // an ISO8601 date e.g. 2012-06-12T15:18:34+03:00
$request->CalendarView->EndDate = date('c', $date_end); // an ISO8601 date later than the above

// Build request type based on provided vars
$request->ParentFolderIds = new EWSType_NonEmptyArrayOfBaseFolderIdsType();
if ($address_type == 'folder_id') {
    $request->ParentFolderIds->FolderId = new EWSType_FolderIdType();
    $request->ParentFolderIds->FolderId->Id = $folder_id;
} elseif ($address_type == 'mailbox') {
    $mailBox =
    $mailBox->EmailAddress = $room['mailbox'];
    $request->ParentFolderIds->DistinguishedFolderId = new EWSType_DistinguishedFolderIdType();
    $request->ParentFolderIds->DistinguishedFolderId->Id = EWSType_DistinguishedFolderIdNameType::CALENDAR;
    $request->ParentFolderIds->DistinguishedFolderId->Mailbox = new EWSType_EmailAddress();
    $request->ParentFolderIds->DistinguishedFolderId->Mailbox->EmailAddress = $mailbox_address;
}

// Send request
$response = $ews->FindItem($request);

//echo '<pre>'.var_export($response, true).'</pre>';
if ($debug) {
    echo '<pre>Total Items in View: '.$response->ResponseMessages->FindItemResponseMessage->RootFolder->TotalItemsInView.'</pre>';
    //echo '<pre>'.var_export($response, true).'</pre>';
}

// Set Timezone responses
$tz['pull'] = $timezone_get ? new DateTimeZone($timezone_get) : new DateTimeZone('UTC');
$tz['push'] = $timezone_set ? new DateTimeZone($timezone_set) : new DateTimeZone('America/New_York');

// Loop through each item if event(s) were found in the timeframe specified
if ($response->ResponseMessages->FindItemResponseMessage->RootFolder->TotalItemsInView > 0) {
    $events = $response->ResponseMessages->FindItemResponseMessage->RootFolder->Items->CalendarItem;
    $event_list = array();
    foreach ($events as $event){
        if ($debug) {
            echo '<pre>'.var_export($event, true).'</pre><br>=================================================<br>';
        }
        $event_data = array();
        foreach ($fields as $field) {
            switch ($field) {
                case 'id': $event_data['id'] = $event->ItemId->Id; break;
                case 'change_key': $event_data['change_key'] = $event->ItemId->ChangeKey; break;
                case 'start':
                    $event_data['start'] = new DateTime($event->Start, $tz['pull']);
                    $event_data['start']->setTimezone($tz['push']);
                    $event_data['start'] = $event_data['start']->format('Y-m-d H:i:s');
                    break;
                case 'end':
                    $event_data['end'] = new DateTime($event->End, $tz['pull']);
                    $event_data['end']->setTimezone($tz['push']);
                    $event_data['end'] = $event_data['end']->format('Y-m-d H:i:s');
                    break;
                case 'subject': $event_data['subject'] = $event->Subject; break;
                case 'location': $event_data['location'] = $event->Location; break;
                case 'allday': $event_data['allday'] = $event->IsAllDayEvent; break;
                case 'duration': $event_data['duration'] = $event->Duration; break;
                case 'uid': $event_data['uid'] = $event->UID;
            }
        }
        if ($debug) {
            echo "<pre>-=-=- Exchange to array data -=-=-\n".var_export($event_data, true).'</pre>';
        }
        $event_list[] = $event_data;
    }
}

echo serialize($event_list);

?>