<?php
/**
 * @file mod/item.php
 */

/*
 * This is the POST destination for most all locally posted
 * text stuff. This function handles status, wall-to-wall status,
 * local comments, and remote coments that are posted on this site
 * (as opposed to being delivered in a feed).
 * Also processed here are posts and comments coming through the
 * statusnet/twitter API.
 *
 * All of these become an "item" which is our basic unit of
 * information.
 */

use Friendica\App;
use Friendica\BaseObject;
use Friendica\Content\Pager;
use Friendica\Content\Text\BBCode;
use Friendica\Content\Text\HTML;
use Friendica\Core\Config;
use Friendica\Core\Hook;
use Friendica\Core\L10n;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\Session;
use Friendica\Core\System;
use Friendica\Core\Worker;
use Friendica\Database\DBA;
use Friendica\Model\Attach;
use Friendica\Model\Contact;
use Friendica\Model\Conversation;
use Friendica\Model\FileTag;
use Friendica\Model\Item;
use Friendica\Model\Photo;
use Friendica\Model\Term;
use Friendica\Protocol\Diaspora;
use Friendica\Protocol\Email;
use Friendica\Util\ACLFormatter;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Emailer;
use Friendica\Util\Security;
use Friendica\Util\Strings;
use Friendica\Worker\Delivery;

require_once __DIR__ . '/../include/items.php';

function item_post(App $a) {
	if (!Session::isAuthenticated()) {
		return 0;
	}

	$uid = local_user();

	if (!empty($_REQUEST['dropitems'])) {
		$arr_drop = explode(',', $_REQUEST['dropitems']);
		drop_items($arr_drop);
		$json = ['success' => 1];
		echo json_encode($json);
		exit();
	}

	Hook::callAll('post_local_start', $_REQUEST);

	Logger::log('postvars ' . print_r($_REQUEST, true), Logger::DATA);

	$api_source = $_REQUEST['api_source'] ?? false;

	$message_id = ((!empty($_REQUEST['message_id']) && $api_source) ? strip_tags($_REQUEST['message_id']) : '');

	$return_path = $_REQUEST['return'] ?? '';
	$preview = intval($_REQUEST['preview'] ?? 0);

	/*
	 * Check for doubly-submitted posts, and reject duplicates
	 * Note that we have to ignore previews, otherwise nothing will post
	 * after it's been previewed
	 */
	if (!$preview && !empty($_REQUEST['post_id_random'])) {
		if (!empty($_SESSION['post-random']) && $_SESSION['post-random'] == $_REQUEST['post_id_random']) {
			Logger::log("item post: duplicate post", Logger::DEBUG);
			item_post_return(System::baseUrl(), $api_source, $return_path);
		} else {
			$_SESSION['post-random'] = $_REQUEST['post_id_random'];
		}
	}

	// Is this a reply to something?
	$toplevel_item_id = intval($_REQUEST['parent'] ?? 0);
	$thr_parent_uri = trim($_REQUEST['parent_uri'] ?? '');

	$thread_parent_id = 0;
	$thread_parent_contact = null;

	$toplevel_item = null;
	$parent_user = null;

	$parent_contact = null;

	$objecttype = null;
	$profile_uid = ($_REQUEST['profile_uid'] ?? 0) ?: local_user();
	$posttype = ($_REQUEST['post_type'] ?? '') ?: Item::PT_ARTICLE;

	if ($toplevel_item_id || $thr_parent_uri) {
		if ($toplevel_item_id) {
			$toplevel_item = Item::selectFirst([], ['id' => $toplevel_item_id]);
		} elseif ($thr_parent_uri) {
			$toplevel_item = Item::selectFirst([], ['uri' => $thr_parent_uri, 'uid' => $profile_uid]);
		}

		// if this isn't the top-level parent of the conversation, find it
		if (DBA::isResult($toplevel_item)) {
			// The URI and the contact is taken from the direct parent which needn't to be the top parent
			$thread_parent_id = $toplevel_item['id'];
			$thr_parent_uri = $toplevel_item['uri'];
			$thread_parent_contact = Contact::getDetailsByURL($toplevel_item["author-link"]);

			if ($toplevel_item['id'] != $toplevel_item['parent']) {
				$toplevel_item = Item::selectFirst(Item::ITEM_FIELDLIST, ['id' => $toplevel_item['parent']]);
			}
		}

		if (!DBA::isResult($toplevel_item)) {
			notice(L10n::t('Unable to locate original post.') . EOL);
			if (!empty($_REQUEST['return'])) {
				$a->internalRedirect($return_path);
			}
			exit();
		}

		$toplevel_item_id = $toplevel_item['id'];
		$parent_user = $toplevel_item['uid'];

		$objecttype = ACTIVITY_OBJ_COMMENT;
	}

	if ($toplevel_item_id) {
		Logger::info('mod_item: item_post parent=' . $toplevel_item_id);
	}

	$post_id     = intval($_REQUEST['post_id'] ?? 0);
	$app         = strip_tags($_REQUEST['source'] ?? '');
	$extid       = strip_tags($_REQUEST['extid'] ?? '');
	$object      = $_REQUEST['object'] ?? '';

	// Don't use "defaults" here. It would turn 0 to 1
	if (!isset($_REQUEST['wall'])) {
		$wall = 1;
	} else {
		$wall = $_REQUEST['wall'];
	}

	// Ensure that the user id in a thread always stay the same
	if (!is_null($parent_user) && in_array($parent_user, [local_user(), 0])) {
		$profile_uid = $parent_user;
	}

	// Check for multiple posts with the same message id (when the post was created via API)
	if (($message_id != '') && ($profile_uid != 0)) {
		if (Item::exists(['uri' => $message_id, 'uid' => $profile_uid])) {
			Logger::log("Message with URI ".$message_id." already exists for user ".$profile_uid, Logger::DEBUG);
			return 0;
		}
	}

	// Allow commenting if it is an answer to a public post
	$allow_comment = local_user() && ($profile_uid == 0) && $toplevel_item_id && in_array($toplevel_item['network'], Protocol::FEDERATED);

	// Now check that valid personal details have been provided
	if (!Security::canWriteToUserWall($profile_uid) && !$allow_comment) {
		notice(L10n::t('Permission denied.') . EOL);

		if (!empty($_REQUEST['return'])) {
			$a->internalRedirect($return_path);
		}

		exit();
	}

	// Init post instance
	$orig_post = null;

	// is this an edited post?
	if ($post_id > 0) {
		$orig_post = Item::selectFirst(Item::ITEM_FIELDLIST, ['id' => $post_id]);
	}

	$user = DBA::selectFirst('user', [], ['uid' => $profile_uid]);

	if (!DBA::isResult($user) && !$toplevel_item_id) {
		return 0;
	}

	$categories = '';
	$postopts = '';
	$emailcc = '';
	$body = $_REQUEST['body'] ?? '';
	$has_attachment = $_REQUEST['has_attachment'] ?? 0;

	// If we have a speparate attachment, we need to add it to the body.
	if (!empty($has_attachment)) {
		$attachment_type  = $_REQUEST['attachment_type'] ??  '';
		$attachment_title = $_REQUEST['attachment_title'] ?? '';
		$attachment_text  = $_REQUEST['attachment_text'] ??  '';

		$attachment_url     = hex2bin($_REQUEST['attachment_url'] ??     '');
		$attachment_img_src = hex2bin($_REQUEST['attachment_img_src'] ?? '');

		$attachment_img_width  = $_REQUEST['attachment_img_width'] ??  0;
		$attachment_img_height = $_REQUEST['attachment_img_height'] ?? 0;
		$attachment = [
			'type'   => $attachment_type,
			'title'  => $attachment_title,
			'text'   => $attachment_text,
			'url'    => $attachment_url,
		];

		if (!empty($attachment_img_src)) {
			$attachment['images'] = [
				0 => [
					'src'    => $attachment_img_src,
					'width'  => $attachment_img_width,
					'height' => $attachment_img_height
				]
			];
		}

		$att_bbcode = add_page_info_data($attachment);
		$body .= $att_bbcode;
	}

	// Convert links with empty descriptions to links without an explicit description
	$body = preg_replace('#\[url=([^\]]*?)\]\[/url\]#ism', '[url]$1[/url]', $body);

	if (!empty($orig_post)) {
		$str_group_allow   = $orig_post['allow_gid'];
		$str_contact_allow = $orig_post['allow_cid'];
		$str_group_deny    = $orig_post['deny_gid'];
		$str_contact_deny  = $orig_post['deny_cid'];
		$location          = $orig_post['location'];
		$coord             = $orig_post['coord'];
		$verb              = $orig_post['verb'];
		$objecttype        = $orig_post['object-type'];
		$app               = $orig_post['app'];
		$categories        = $orig_post['file'];
		$title             = Strings::escapeTags(trim($_REQUEST['title']));
		$body              = Strings::escapeHtml(trim($body));
		$private           = $orig_post['private'];
		$pubmail_enabled   = $orig_post['pubmail'];
		$network           = $orig_post['network'];
		$guid              = $orig_post['guid'];
		$extid             = $orig_post['extid'];

	} else {

		/*
		 * if coming from the API and no privacy settings are set,
		 * use the user default permissions - as they won't have
		 * been supplied via a form.
		 */
		if ($api_source
			&& !array_key_exists('contact_allow', $_REQUEST)
			&& !array_key_exists('group_allow', $_REQUEST)
			&& !array_key_exists('contact_deny', $_REQUEST)
			&& !array_key_exists('group_deny', $_REQUEST)) {
			$str_group_allow   = $user['allow_gid'];
			$str_contact_allow = $user['allow_cid'];
			$str_group_deny    = $user['deny_gid'];
			$str_contact_deny  = $user['deny_cid'];
		} else {
			// use the posted permissions

			/** @var ACLFormatter $aclFormatter */
			$aclFormatter = BaseObject::getClass(ACLFormatter::class);

			$str_group_allow   = $aclFormatter->aclToString($_REQUEST['group_allow'] ?? '');
			$str_contact_allow = $aclFormatter->aclToString($_REQUEST['contact_allow'] ?? '');
			$str_group_deny    = $aclFormatter->aclToString($_REQUEST['group_deny'] ?? '');
			$str_contact_deny  = $aclFormatter->aclToString($_REQUEST['contact_deny'] ?? '');
		}

		$title             = Strings::escapeTags(trim($_REQUEST['title']    ?? ''));
		$location          = Strings::escapeTags(trim($_REQUEST['location'] ?? ''));
		$coord             = Strings::escapeTags(trim($_REQUEST['coord']    ?? ''));
		$verb              = Strings::escapeTags(trim($_REQUEST['verb']     ?? ''));
		$emailcc           = Strings::escapeTags(trim($_REQUEST['emailcc']  ?? ''));
		$body              = Strings::escapeHtml(trim($body));
		$network           = Strings::escapeTags(trim(($_REQUEST['network']  ?? '') ?: Protocol::DFRN));
		$guid              = System::createUUID();

		$postopts = $_REQUEST['postopts'] ?? '';

		$private = ((strlen($str_group_allow) || strlen($str_contact_allow) || strlen($str_group_deny) || strlen($str_contact_deny)) ? 1 : 0);

		// If this is a comment, set the permissions from the parent.

		if ($toplevel_item) {
			// for non native networks use the network of the original post as network of the item
			if (($toplevel_item['network'] != Protocol::DIASPORA)
				&& ($toplevel_item['network'] != Protocol::OSTATUS)
				&& ($network == "")) {
				$network = $toplevel_item['network'];
			}

			$str_contact_allow = $toplevel_item['allow_cid'];
			$str_group_allow   = $toplevel_item['allow_gid'];
			$str_contact_deny  = $toplevel_item['deny_cid'];
			$str_group_deny    = $toplevel_item['deny_gid'];
			$private           = $toplevel_item['private'];

			$wall              = $toplevel_item['wall'];
		}

		$pubmail_enabled = ($_REQUEST['pubmail_enable'] ?? false) && !$private;

		// if using the API, we won't see pubmail_enable - figure out if it should be set
		if ($api_source && $profile_uid && $profile_uid == local_user() && !$private) {
			if (function_exists('imap_open') && !Config::get('system', 'imap_disabled')) {
				$pubmail_enabled = DBA::exists('mailacct', ["`uid` = ? AND `server` != ? AND `pubmail`", local_user(), '']);
			}
		}

		if (!strlen($body)) {
			if ($preview) {
				exit();
			}
			info(L10n::t('Empty post discarded.') . EOL);
			if (!empty($_REQUEST['return'])) {
				$a->internalRedirect($return_path);
			}
			exit();
		}
	}

	if (!empty($categories)) {
		// get the "fileas" tags for this post
		$filedas = FileTag::fileToArray($categories);
	}

	// save old and new categories, so we can determine what needs to be deleted from pconfig
	$categories_old = $categories;
	$categories = FileTag::listToFile(trim($_REQUEST['category'] ?? ''), 'category');
	$categories_new = $categories;

	if (!empty($filedas) && is_array($filedas)) {
		// append the fileas stuff to the new categories list
		$categories .= FileTag::arrayToFile($filedas);
	}

	// get contact info for poster

	$author = null;
	$self   = false;
	$contact_id = 0;

	if (local_user() && ((local_user() == $profile_uid) || $allow_comment)) {
		$self = true;
		$author = DBA::selectFirst('contact', [], ['uid' => local_user(), 'self' => true]);
	} elseif (!empty(Session::getRemoteContactID($profile_uid))) {
		$author = DBA::selectFirst('contact', [], ['id' => Session::getRemoteContactID($profile_uid)]);
	}

	if (DBA::isResult($author)) {
		$contact_id = $author['id'];
	}

	// get contact info for owner
	if ($profile_uid == local_user() || $allow_comment) {
		$contact_record = $author;
	} else {
		$contact_record = DBA::selectFirst('contact', [], ['uid' => $profile_uid, 'self' => true]);
	}

	// Look for any tags and linkify them
	$str_tags = '';
	$inform   = '';

	$tags = BBCode::getTags($body);

	if ($thread_parent_id && !\Friendica\Content\Feature::isEnabled($uid, 'explicit_mentions')) {
		$tags = item_add_implicit_mentions($tags, $thread_parent_contact, $thread_parent_id);
	}

	$tagged = [];

	$private_forum = false;
	$only_to_forum = false;
	$forum_contact = [];

	if (count($tags)) {
		foreach ($tags as $tag) {
			$tag_type = substr($tag, 0, 1);

			if ($tag_type == Term::TAG_CHARACTER[Term::HASHTAG]) {
				continue;
			}

			/*
			 * If we already tagged 'Robert Johnson', don't try and tag 'Robert'.
			 * Robert Johnson should be first in the $tags array
			 */
			$fullnametagged = false;
			/// @TODO $tagged is initialized above if () block and is not filled, maybe old-lost code?
			foreach ($tagged as $nextTag) {
				if (stristr($nextTag, $tag . ' ')) {
					$fullnametagged = true;
					break;
				}
			}
			if ($fullnametagged) {
				continue;
			}

			$success = handle_tag($body, $inform, $str_tags, local_user() ? local_user() : $profile_uid, $tag, $network);
			if ($success['replaced']) {
				$tagged[] = $tag;
			}
			// When the forum is private or the forum is addressed with a "!" make the post private
			if (is_array($success['contact']) && (!empty($success['contact']['prv']) || ($tag_type == Term::TAG_CHARACTER[Term::EXCLUSIVE_MENTION]))) {
				$private_forum = $success['contact']['prv'];
				$only_to_forum = ($tag_type == Term::TAG_CHARACTER[Term::EXCLUSIVE_MENTION]);
				$private_id = $success['contact']['id'];
				$forum_contact = $success['contact'];
			} elseif (is_array($success['contact']) && !empty($success['contact']['forum']) &&
				($str_contact_allow == '<' . $success['contact']['id'] . '>')) {
				$private_forum = false;
				$only_to_forum = true;
				$private_id = $success['contact']['id'];
				$forum_contact = $success['contact'];
			}
		}
	}

	$original_contact_id = $contact_id;

	if (!$toplevel_item_id && count($forum_contact) && ($private_forum || $only_to_forum)) {
		// we tagged a forum in a top level post. Now we change the post
		$private = $private_forum;

		$str_group_allow = '';
		$str_contact_deny = '';
		$str_group_deny = '';
		if ($private_forum) {
			$str_contact_allow = '<' . $private_id . '>';
		} else {
			$str_contact_allow = '';
		}
		$contact_id = $private_id;
		$contact_record = $forum_contact;
		$_REQUEST['origin'] = false;
		$wall = 0;
	}

	/*
	 * When a photo was uploaded into the message using the (profile wall) ajax
	 * uploader, The permissions are initially set to disallow anybody but the
	 * owner from seeing it. This is because the permissions may not yet have been
	 * set for the post. If it's private, the photo permissions should be set
	 * appropriately. But we didn't know the final permissions on the post until
	 * now. So now we'll look for links of uploaded messages that are in the
	 * post and set them to the same permissions as the post itself.
	 */

	$match = null;

	if (!$preview && Photo::setPermissionFromBody($body, $profile_uid, $original_contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)) {
		$objecttype = ACTIVITY_OBJ_IMAGE;
	}

	/*
	 * Next link in any attachment references we find in the post.
	 */
	$match = false;

	/// @todo these lines should be moved to Model/Attach (Once it exists)
	if (!$preview && preg_match_all("/\[attachment\](.*?)\[\/attachment\]/", $body, $match)) {
		$attaches = $match[1];
		if (count($attaches)) {
			foreach ($attaches as $attach) {
				// Ensure to only modify attachments that you own
				$srch = '<' . intval($original_contact_id) . '>';

				$condition = ['allow_cid' => $srch, 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '',
						'id' => $attach];
				if (!Attach::exists($condition)) {
					continue;
				}

				$fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
						'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
				$condition = ['id' => $attach];
				Attach::update($fields, $condition);
			}
		}
	}

	// embedded bookmark or attachment in post? set bookmark flag

	$data = BBCode::getAttachmentData($body);
	if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $body, $match, PREG_SET_ORDER) || isset($data["type"]))
		&& ($posttype != Item::PT_PERSONAL_NOTE)) {
		$posttype = Item::PT_PAGE;
		$objecttype = ACTIVITY_OBJ_BOOKMARK;
	}

	/** @var BBCode\Video $bbCodeVideo */
	$bbCodeVideo = BaseObject::getClass(BBCode\Video::class);
	$body =  $bbCodeVideo->transform($body);

	// Fold multi-line [code] sequences
	$body = preg_replace('/\[\/code\]\s*\[code\]/ism', "\n", $body);

	$body = BBCode::scaleExternalImages($body, false);

	// Setting the object type if not defined before
	if (!$objecttype) {
		$objecttype = ACTIVITY_OBJ_NOTE; // Default value
		$objectdata = BBCode::getAttachedData($body);

		if ($objectdata["type"] == "link") {
			$objecttype = ACTIVITY_OBJ_BOOKMARK;
		} elseif ($objectdata["type"] == "video") {
			$objecttype = ACTIVITY_OBJ_VIDEO;
		} elseif ($objectdata["type"] == "photo") {
			$objecttype = ACTIVITY_OBJ_IMAGE;
		}

	}

	$attachments = '';
	$match = false;

	if (preg_match_all('/(\[attachment\]([0-9]+)\[\/attachment\])/',$body,$match)) {
		foreach ($match[2] as $mtch) {
			$fields = ['id', 'filename', 'filesize', 'filetype'];
			$attachment = Attach::selectFirst($fields, ['id' => $mtch]);
			if ($attachment !== false) {
				if (strlen($attachments)) {
					$attachments .= ',';
				}
				$attachments .= '[attach]href="' . System::baseUrl() . '/attach/' . $attachment['id'] .
						'" length="' . $attachment['filesize'] . '" type="' . $attachment['filetype'] .
						'" title="' . ($attachment['filename'] ? $attachment['filename'] : '') . '"[/attach]';
			}
			$body = str_replace($match[1],'',$body);
		}
	}

	if (!strlen($verb)) {
		$verb = ACTIVITY_POST;
	}

	if ($network == "") {
		$network = Protocol::DFRN;
	}

	$gravity = ($toplevel_item_id ? GRAVITY_COMMENT : GRAVITY_PARENT);

	// even if the post arrived via API we are considering that it
	// originated on this site by default for determining relayability.

	// Don't use "defaults" here. It would turn 0 to 1
	if (!isset($_REQUEST['origin'])) {
		$origin = 1;
	} else {
		$origin = $_REQUEST['origin'];
	}

	$uri = ($message_id ? $message_id : Item::newURI($api_source ? $profile_uid : $uid, $guid));

	// Fallback so that we alway have a parent uri
	if (!$thr_parent_uri || !$toplevel_item_id) {
		$thr_parent_uri = $uri;
	}

	$datarray = [];
	$datarray['uid']           = $profile_uid;
	$datarray['wall']          = $wall;
	$datarray['gravity']       = $gravity;
	$datarray['network']       = $network;
	$datarray['contact-id']    = $contact_id;
	$datarray['owner-name']    = $contact_record['name'];
	$datarray['owner-link']    = $contact_record['url'];
	$datarray['owner-avatar']  = $contact_record['thumb'];
	$datarray['owner-id']      = Contact::getIdForURL($datarray['owner-link']);
	$datarray['author-name']   = $author['name'];
	$datarray['author-link']   = $author['url'];
	$datarray['author-avatar'] = $author['thumb'];
	$datarray['author-id']     = Contact::getIdForURL($datarray['author-link']);
	$datarray['created']       = DateTimeFormat::utcNow();
	$datarray['edited']        = DateTimeFormat::utcNow();
	$datarray['commented']     = DateTimeFormat::utcNow();
	$datarray['received']      = DateTimeFormat::utcNow();
	$datarray['changed']       = DateTimeFormat::utcNow();
	$datarray['extid']         = $extid;
	$datarray['guid']          = $guid;
	$datarray['uri']           = $uri;
	$datarray['title']         = $title;
	$datarray['body']          = $body;
	$datarray['app']           = $app;
	$datarray['location']      = $location;
	$datarray['coord']         = $coord;
	$datarray['tag']           = $str_tags;
	$datarray['file']          = $categories;
	$datarray['inform']        = $inform;
	$datarray['verb']          = $verb;
	$datarray['post-type']     = $posttype;
	$datarray['object-type']   = $objecttype;
	$datarray['allow_cid']     = $str_contact_allow;
	$datarray['allow_gid']     = $str_group_allow;
	$datarray['deny_cid']      = $str_contact_deny;
	$datarray['deny_gid']      = $str_group_deny;
	$datarray['private']       = $private;
	$datarray['pubmail']       = $pubmail_enabled;
	$datarray['attach']        = $attachments;

	// This is not a bug. The item store function changes 'parent-uri' to 'thr-parent' and fetches 'parent-uri' new. (We should change this)
	$datarray['parent-uri']    = $thr_parent_uri;

	$datarray['postopts']      = $postopts;
	$datarray['origin']        = $origin;
	$datarray['moderated']     = false;
	$datarray['object']        = $object;

	/*
	 * These fields are for the convenience of addons...
	 * 'self' if true indicates the owner is posting on their own wall
	 * If parent is 0 it is a top-level post.
	 */
	$datarray['parent']        = $toplevel_item_id;
	$datarray['self']          = $self;

	// This triggers posts via API and the mirror functions
	$datarray['api_source'] = $api_source;

	// This field is for storing the raw conversation data
	$datarray['protocol'] = Conversation::PARCEL_DFRN;

	$conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $datarray['parent-uri']]);
	if (DBA::isResult($conversation)) {
		if ($conversation['conversation-uri'] != '') {
			$datarray['conversation-uri'] = $conversation['conversation-uri'];
		}
		if ($conversation['conversation-href'] != '') {
			$datarray['conversation-href'] = $conversation['conversation-href'];
		}
	}

	if ($orig_post) {
		$datarray['edit'] = true;
	} else {
		$datarray['edit'] = false;
	}

	// Check for hashtags in the body and repair or add hashtag links
	if ($preview || $orig_post) {
		Item::setHashtags($datarray);
	}

	// preview mode - prepare the body for display and send it via json
	if ($preview) {
		// We set the datarray ID to -1 because in preview mode the dataray
		// doesn't have an ID.
		$datarray["id"] = -1;
		$datarray["item_id"] = -1;
		$datarray["author-network"] = Protocol::DFRN;

		$o = conversation($a, [array_merge($contact_record, $datarray)], new Pager($a->query_string), 'search', false, true);
		Logger::log('preview: ' . $o);
		echo json_encode(['preview' => $o]);
		exit();
	}

	Hook::callAll('post_local',$datarray);

	if (!empty($datarray['cancel'])) {
		Logger::log('mod_item: post cancelled by addon.');
		if ($return_path) {
			$a->internalRedirect($return_path);
		}

		$json = ['cancel' => 1];
		if (!empty($_REQUEST['jsreload'])) {
			$json['reload'] = System::baseUrl() . '/' . $_REQUEST['jsreload'];
		}

		echo json_encode($json);
		exit();
	}

	if ($orig_post)	{
		// Fill the cache field
		// This could be done in Item::update as well - but we have to check for the existance of some fields.
		Item::putInCache($datarray);

		$fields = [
			'title' => $datarray['title'],
			'body' => $datarray['body'],
			'tag' => $datarray['tag'],
			'attach' => $datarray['attach'],
			'file' => $datarray['file'],
			'rendered-html' => $datarray['rendered-html'],
			'rendered-hash' => $datarray['rendered-hash'],
			'edited' => DateTimeFormat::utcNow(),
			'changed' => DateTimeFormat::utcNow()];

		Item::update($fields, ['id' => $post_id]);

		// update filetags in pconfig
		FileTag::updatePconfig($uid, $categories_old, $categories_new, 'category');

		if (!empty($_REQUEST['return']) && strlen($return_path)) {
			Logger::log('return: ' . $return_path);
			$a->internalRedirect($return_path);
		}
		exit();
	}

	unset($datarray['edit']);
	unset($datarray['self']);
	unset($datarray['api_source']);

	if ($origin) {
		$signed = Diaspora::createCommentSignature($uid, $datarray);
		if (!empty($signed)) {
			$datarray['diaspora_signed_text'] = json_encode($signed);
		}
	}

	$post_id = Item::insert($datarray);

	if (!$post_id) {
		Logger::log("Item wasn't stored.");
		$a->internalRedirect($return_path);
	}

	$datarray = Item::selectFirst(Item::ITEM_FIELDLIST, ['id' => $post_id]);

	if (!DBA::isResult($datarray)) {
		Logger::log("Item with id ".$post_id." couldn't be fetched.");
		$a->internalRedirect($return_path);
	}

	// update filetags in pconfig
	FileTag::updatePconfig($uid, $categories_old, $categories_new, 'category');

	// These notifications are sent if someone else is commenting other your wall
	if ($toplevel_item_id) {
		if ($contact_record != $author) {
			notification([
				'type'         => NOTIFY_COMMENT,
				'notify_flags' => $user['notify-flags'],
				'language'     => $user['language'],
				'to_name'      => $user['username'],
				'to_email'     => $user['email'],
				'uid'          => $user['uid'],
				'item'         => $datarray,
				'link'         => System::baseUrl().'/display/'.urlencode($datarray['guid']),
				'source_name'  => $datarray['author-name'],
				'source_link'  => $datarray['author-link'],
				'source_photo' => $datarray['author-avatar'],
				'verb'         => ACTIVITY_POST,
				'otype'        => 'item',
				'parent'       => $toplevel_item_id,
				'parent_uri'   => $toplevel_item['uri']
			]);
		}
	} else {
		if (($contact_record != $author) && !count($forum_contact)) {
			notification([
				'type'         => NOTIFY_WALL,
				'notify_flags' => $user['notify-flags'],
				'language'     => $user['language'],
				'to_name'      => $user['username'],
				'to_email'     => $user['email'],
				'uid'          => $user['uid'],
				'item'         => $datarray,
				'link'         => System::baseUrl().'/display/'.urlencode($datarray['guid']),
				'source_name'  => $datarray['author-name'],
				'source_link'  => $datarray['author-link'],
				'source_photo' => $datarray['author-avatar'],
				'verb'         => ACTIVITY_POST,
				'otype'        => 'item'
			]);
		}
	}

	Hook::callAll('post_local_end', $datarray);

	if (strlen($emailcc) && $profile_uid == local_user()) {
		$erecips = explode(',', $emailcc);
		if (count($erecips)) {
			foreach ($erecips as $recip) {
				$addr = trim($recip);
				if (!strlen($addr)) {
					continue;
				}
				$disclaimer = '<hr />' . L10n::t('This message was sent to you by %s, a member of the Friendica social network.', $a->user['username'])
					. '<br />';
				$disclaimer .= L10n::t('You may visit them online at %s', System::baseUrl() . '/profile/' . $a->user['nickname']) . EOL;
				$disclaimer .= L10n::t('Please contact the sender by replying to this post if you do not wish to receive these messages.') . EOL;
				if (!$datarray['title']=='') {
					$subject = Email::encodeHeader($datarray['title'], 'UTF-8');
				} else {
					$subject = Email::encodeHeader('[Friendica]' . ' ' . L10n::t('%s posted an update.', $a->user['username']), 'UTF-8');
				}
				$link = '<a href="' . System::baseUrl() . '/profile/' . $a->user['nickname'] . '"><img src="' . $author['thumb'] . '" alt="' . $a->user['username'] . '" /></a><br /><br />';
				$html    = Item::prepareBody($datarray);
				$message = '<html><body>' . $link . $html . $disclaimer . '</body></html>';
				$params =  [
					'fromName' => $a->user['username'],
					'fromEmail' => $a->user['email'],
					'toEmail' => $addr,
					'replyTo' => $a->user['email'],
					'messageSubject' => $subject,
					'htmlVersion' => $message,
					'textVersion' => HTML::toPlaintext($html.$disclaimer)
				];
				Emailer::send($params);
			}
		}
	}

	// Insert an item entry for UID=0 for global entries.
	// We now do it in the background to save some time.
	// This is important in interactive environments like the frontend or the API.
	// We don't fork a new process since this is done anyway with the following command
	Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "CreateShadowEntry", $post_id);

	// When we are doing some forum posting via ! we have to start the notifier manually.
	// These kind of posts don't initiate the notifier call in the item class.
	if ($only_to_forum) {
		Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => false], "Notifier", Delivery::POST, $post_id);
	}

	Logger::log('post_complete');

	if ($api_source) {
		return $post_id;
	}

	item_post_return(System::baseUrl(), $api_source, $return_path);
	// NOTREACHED
}

function item_post_return($baseurl, $api_source, $return_path)
{
	// figure out how to return, depending on from whence we came
    $a = \get_app();

	if ($api_source) {
		return;
	}

	if ($return_path) {
		$a->internalRedirect($return_path);
	}

	$json = ['success' => 1];
	if (!empty($_REQUEST['jsreload'])) {
		$json['reload'] = $baseurl . '/' . $_REQUEST['jsreload'];
	}

	Logger::log('post_json: ' . print_r($json, true), Logger::DEBUG);

	echo json_encode($json);
	exit();
}

function item_content(App $a)
{
	if (!Session::isAuthenticated()) {
		return;
	}

	$o = '';

	if (($a->argc >= 3) && ($a->argv[1] === 'drop') && intval($a->argv[2])) {
		if ($a->isAjax()) {
			$o = Item::deleteForUser(['id' => $a->argv[2]], local_user());
		} else {
			if (!empty($a->argv[3])) {
				$o = drop_item($a->argv[2], $a->argv[3]);
			}
			else {
				$o = drop_item($a->argv[2]);
			}
		}

		if ($a->isAjax()) {
			// ajax return: [<item id>, 0 (no perm) | <owner id>]
			echo json_encode([intval($a->argv[2]), intval($o)]);
			exit();
		}
	}

	return $o;
}

/**
 * This function removes the tag $tag from the text $body and replaces it with
 * the appropriate link.
 *
 * @param App     $a
 * @param string  $body     the text to replace the tag in
 * @param string  $inform   a comma-seperated string containing everybody to inform
 * @param string  $str_tags string to add the tag to
 * @param integer $profile_uid
 * @param string  $tag      the tag to replace
 * @param string  $network  The network of the post
 *
 * @return array|bool ['replaced' => $replaced, 'contact' => $contact];
 * @throws ImagickException
 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 */
function handle_tag(&$body, &$inform, &$str_tags, $profile_uid, $tag, $network = "")
{
	$replaced = false;
	$r = null;

	//is it a person tag?
	if (Term::isType($tag, Term::MENTION, Term::IMPLICIT_MENTION, Term::EXCLUSIVE_MENTION)) {
		$tag_type = substr($tag, 0, 1);
		//is it already replaced?
		if (strpos($tag, '[url=')) {
			//append tag to str_tags
			if (!stristr($str_tags, $tag)) {
				if (strlen($str_tags)) {
					$str_tags .= ',';
				}
				$str_tags .= $tag;
			}

			// Checking for the alias that is used for OStatus
			$pattern = "/[@!]\[url\=(.*?)\](.*?)\[\/url\]/ism";
			if (preg_match($pattern, $tag, $matches)) {
				$data = Contact::getDetailsByURL($matches[1]);

				if ($data["alias"] != "") {
					$newtag = '@[url=' . $data["alias"] . ']' . $data["nick"] . '[/url]';

					if (!stripos($str_tags, '[url=' . $data["alias"] . ']')) {
						if (strlen($str_tags)) {
							$str_tags .= ',';
						}

						$str_tags .= $newtag;
					}
				}
			}

			return $replaced;
		}

		//get the person's name
		$name = substr($tag, 1);

		// Sometimes the tag detection doesn't seem to work right
		// This is some workaround
		$nameparts = explode(" ", $name);
		$name = $nameparts[0];

		// Try to detect the contact in various ways
		if (strpos($name, 'http://')) {
			// At first we have to ensure that the contact exists
			Contact::getIdForURL($name);

			// Now we should have something
			$contact = Contact::getDetailsByURL($name);
		} elseif (strpos($name, '@')) {
			// This function automatically probes when no entry was found
			$contact = Contact::getDetailsByAddr($name);
		} else {
			$contact = false;
			$fields = ['id', 'url', 'nick', 'name', 'alias', 'network', 'forum', 'prv'];

			if (strrpos($name, '+')) {
				// Is it in format @nick+number?
				$tagcid = intval(substr($name, strrpos($name, '+') + 1));
				$contact = DBA::selectFirst('contact', $fields, ['id' => $tagcid, 'uid' => $profile_uid]);
			}

			// select someone by nick or attag in the current network
			if (!DBA::isResult($contact) && ($network != "")) {
				$condition = ["(`nick` = ? OR `attag` = ?) AND `network` = ? AND `uid` = ?",
						$name, $name, $network, $profile_uid];
				$contact = DBA::selectFirst('contact', $fields, $condition);
			}

			//select someone by name in the current network
			if (!DBA::isResult($contact) && ($network != "")) {
				$condition = ['name' => $name, 'network' => $network, 'uid' => $profile_uid];
				$contact = DBA::selectFirst('contact', $fields, $condition);
			}

			// select someone by nick or attag in any network
			if (!DBA::isResult($contact)) {
				$condition = ["(`nick` = ? OR `attag` = ?) AND `uid` = ?", $name, $name, $profile_uid];
				$contact = DBA::selectFirst('contact', $fields, $condition);
			}

			// select someone by name in any network
			if (!DBA::isResult($contact)) {
				$condition = ['name' => $name, 'uid' => $profile_uid];
				$contact = DBA::selectFirst('contact', $fields, $condition);
			}
		}

		// Check if $contact has been successfully loaded
		if (DBA::isResult($contact)) {
			if (strlen($inform) && (isset($contact["notify"]) || isset($contact["id"]))) {
				$inform .= ',';
			}

			if (isset($contact["id"])) {
				$inform .= 'cid:' . $contact["id"];
			} elseif (isset($contact["notify"])) {
				$inform  .= $contact["notify"];
			}

			$profile = $contact["url"];
			$alias   = $contact["alias"];
			$newname = ($contact["name"] ?? '') ?: $contact["nick"];
		}

		//if there is an url for this persons profile
		if (isset($profile) && ($newname != "")) {
			$replaced = true;
			// create profile link
			$profile = str_replace(',', '%2c', $profile);
			$newtag = $tag_type.'[url=' . $profile . ']' . $newname . '[/url]';
			$body = str_replace($tag_type . $name, $newtag, $body);
			// append tag to str_tags
			if (!stristr($str_tags, $newtag)) {
				if (strlen($str_tags)) {
					$str_tags .= ',';
				}
				$str_tags .= $newtag;
			}

			/*
			 * Status.Net seems to require the numeric ID URL in a mention if the person isn't
			 * subscribed to you. But the nickname URL is OK if they are. Grrr. We'll tag both.
			 */
			if (!empty($alias)) {
				$newtag = '@[url=' . $alias . ']' . $newname . '[/url]';
				if (!stripos($str_tags, '[url=' . $alias . ']')) {
					if (strlen($str_tags)) {
						$str_tags .= ',';
					}
					$str_tags .= $newtag;
				}
			}
		}
	}

	return ['replaced' => $replaced, 'contact' => $contact];
}

function item_add_implicit_mentions(array $tags, array $thread_parent_contact, $thread_parent_id)
{
	if (Config::get('system', 'disable_implicit_mentions')) {
		// Add a tag if the parent contact is from ActivityPub or OStatus (This will notify them)
		if (in_array($thread_parent_contact['network'], [Protocol::OSTATUS, Protocol::ACTIVITYPUB])) {
			$contact = Term::TAG_CHARACTER[Term::MENTION] . '[url=' . $thread_parent_contact['url'] . ']' . $thread_parent_contact['nick'] . '[/url]';
			if (!stripos(implode($tags), '[url=' . $thread_parent_contact['url'] . ']')) {
				$tags[] = $contact;
			}
		}
	} else {
		$implicit_mentions = [
			$thread_parent_contact['url'] => $thread_parent_contact['nick']
		];

		$parent_terms = Term::tagArrayFromItemId($thread_parent_id, [Term::MENTION, Term::IMPLICIT_MENTION]);

		foreach ($parent_terms as $parent_term) {
			$implicit_mentions[$parent_term['url']] = $parent_term['term'];
		}

		foreach ($implicit_mentions as $url => $label) {
			if ($url != \Friendica\Model\Profile::getMyURL() && !stripos(implode($tags), '[url=' . $url . ']')) {
				$tags[] = Term::TAG_CHARACTER[Term::IMPLICIT_MENTION] . '[url=' . $url . ']' . $label . '[/url]';
			}
		}
	}

	return $tags;
}