<?php
/**
 * Tidypics Add Photo Tag
 *
 */

gatekeeper();
action_gatekeeper();

$coordinates_str = get_input('coordinates');

$user_id = get_input('user_id');
$image_guid = get_input('image_guid');
$word = get_input('word');

if ($image_guid == 0) {
	register_error(elgg_echo("tidypics:phototagging:error"));
	forward($_SERVER['HTTP_REFERER']);
}

$image = get_entity($image_guid);
if (!$image) {
	register_error(elgg_echo("tidypics:phototagging:error"));
	forward($_SERVER['HTTP_REFERER']);
}

// test for empty tag
if ($user_id == 0 && empty($word)) {
	register_error(elgg_echo("tidypics:phototagging:error"));
	forward($_SERVER['HTTP_REFERER']);
}


$new_word_tag = false;
if ($user_id != 0) {
	$relationships_type = 'user';
	$value = $user_id;
} else {
	$relationships_type = 'word';
	$value = $word;

	// check to see if the photo has this tag and add if not
	if (!is_array($image->tags)) {
		if ($image->tags != $word) {
			$new_word_tag = true;
			$tagarray = $image->tags . ',' . $word;
			$tagarray = string_to_tag_array($tagarray);
		}
	} else {
		if (!in_array($word, $image->tags)) {
			$new_word_tag = true;
			$tagarray = $image->tags;
			$tagarray[] = $word;
		}
	}
}

// add new tag now so it is available in search
if ($new_word_tag) {
	$image->clearMetadata('tags');
	$image->tags = $tagarray;
}

// create string for javascript tag object
$tag->coords = $coordinates_str;
$tag->type   = $relationships_type;
$tag->value  = $value;

$access_id = $image->getAccessID();
$owner_id = get_loggedin_userid();
$tagger = get_loggedin_user();

//Save annotation
if ($image->annotate('phototag', serialize($tag), $access_id, $owner_id)) {
	// if tag is a user id, add relationship for searching (find all images with user x)
	if ($relationships_type === 'user') {
		if (!check_entity_relationship($user_id, 'phototag', $image_guid)) {
			add_entity_relationship($user_id, 'phototag', $image_guid);

			// also add this to the river - subject is image, object is the tagged user
			add_to_river('river/object/image/tag', 'tag', $image_guid, $user_id, $access_id);

			// notify user of tagging as long as not self
			if ($owner_id != $user_id) {
				notify_user(
						$user_id,
						$owner_id,
						elgg_echo('tidypics:tag:subject'),
						sprintf(
							elgg_echo('tidypics:tag:body'),
							$image->title,
							$tagger->name,
							$image->getURL()
						)
				);
			}
		}
	}

	system_message(elgg_echo("tidypics:phototagging:success"));
}


forward($_SERVER['HTTP_REFERER']);