GRAYBYTE WORDPRESS FILE MANAGER6296

<?php

/**
 * FooGallery global functions
 *
 * @package   FooGallery
 * @author    Brad Vincent <brad@fooplugins.com>
 * @license   GPL-2.0+
 * @link      https://github.com/fooplugins/foogallery
 * @copyright 2014 FooPlugins LLC
 */
/**
 * Returns the name of the plugin. (Allows the name to be overridden from extensions or functions.php)
 * @return string
 */
function foogallery_plugin_name() {
    return apply_filters( 'foogallery_plugin_name', 'FooGallery' );
}

/**
 * Return all the gallery templates used within FooGallery
 *
 * @return array
 */
function foogallery_gallery_templates() {
    return apply_filters( 'foogallery_gallery_templates', array() );
}

/**
 * Return a specific gallery template based on the slug
 * @param $slug
 *
 * @return bool|array
 */
function foogallery_get_gallery_template(  $slug  ) {
    foreach ( foogallery_gallery_templates() as $template ) {
        if ( $slug == $template['slug'] ) {
            return $template;
        }
    }
    return false;
}

/**
 * Return the FooGallery extension API class
 *
 * @return FooGallery_Extensions_API
 */
function foogallery_extensions_api() {
    return new FooGallery_Extensions_API();
}

/**
 * Returns the default gallery template
 *
 * @return string
 */
function foogallery_default_gallery_template() {
    return foogallery_get_setting( 'gallery_template' );
}

/**
 * Returns if gallery permalinks are enabled
 *
 * @return bool
 */
function foogallery_permalinks_enabled() {
    return foogallery_get_setting( 'gallery_permalinks_enabled' );
}

/**
 * Returns the gallery permalink
 *
 * @return string
 */
function foogallery_permalink() {
    return foogallery_get_setting( 'gallery_permalink' );
}

/**
 * Return the FooGallery saved setting, or a default value
 *
 * @param string $key The key for the setting
 *
 * @param bool $default The default if no value is saved or found
 *
 * @return mixed
 */
function foogallery_get_setting(  $key, $default = false  ) {
    $foogallery = FooGallery_Plugin::get_instance();
    return $foogallery->options()->get( $key, foogallery_get_default( $key, $default ) );
}

/**
 * Sets a specific option based on a key
 *
 * @param $key
 * @param $value
 *
 * @return mixed
 */
function foogallery_set_setting(  $key, $value  ) {
    $foogallery = FooGallery_Plugin::get_instance();
    return $foogallery->options()->save( $key, $value );
}

/**
 * Builds up a FooGallery gallery shortcode
 *
 * @param $gallery_id
 *
 * @return string
 */
function foogallery_build_gallery_shortcode(  $gallery_id  ) {
    return '[' . foogallery_gallery_shortcode_tag() . ' id="' . $gallery_id . '"]';
}

/**
 * Returns the gallery shortcode tag
 *
 * @return string
 */
function foogallery_gallery_shortcode_tag() {
    return apply_filters( 'foogallery_gallery_shortcode_tag', FOOGALLERY_CPT_GALLERY );
}

/**
 * Helper method for getting default settings
 *
 * @param string $key The default config key to retrieve.
 *
 * @param bool $default The default if no default is set or found
 *
 * @return string Key value on success, false on failure.
 */
function foogallery_get_default(  $key, $default = false  ) {
    $defaults = array(
        'gallery_template'           => 'default',
        'gallery_permalinks_enabled' => false,
        'gallery_permalink'          => 'gallery',
        'lightbox'                   => 'foogallery',
        'thumb_jpeg_quality'         => '90',
        'gallery_sorting'            => '',
        'datasource'                 => 'media_library',
        'advanced_attachment_modal'  => 'on',
    );
    // A handy filter to override the defaults.
    $defaults = apply_filters( 'foogallery_defaults', $defaults );
    // Return the key specified.
    return ( isset( $defaults[$key] ) ? $defaults[$key] : $default );
}

/**
 * Returns the FooGallery Galleries Url within the admin
 *
 * @return string The Url to the FooGallery Gallery listing page in admin
 */
function foogallery_admin_gallery_listing_url() {
    return admin_url( 'edit.php?post_type=' . FOOGALLERY_CPT_GALLERY );
}

/**
 * Returns the FooGallery Add Gallery Url within the admin
 *
 * @return string The Url to the FooGallery Add Gallery page in admin
 */
function foogallery_admin_add_gallery_url() {
    return admin_url( 'post-new.php?post_type=' . FOOGALLERY_CPT_GALLERY );
}

/**
 * Returns the FooGallery help page Url within the admin
 *
 * @return string The Url to the FooGallery help page in admin
 */
function foogallery_admin_help_url() {
    return admin_url( add_query_arg( array(
        'page' => FOOGALLERY_ADMIN_MENU_HELP_SLUG,
    ), foogallery_admin_menu_parent_slug() ) );
}

/**
 * Returns the FooGallery settings page Url within the admin
 *
 * @return string The Url to the FooGallery settings page in admin
 */
function foogallery_admin_settings_url() {
    return admin_url( add_query_arg( array(
        'page' => FOOGALLERY_ADMIN_MENU_SETTINGS_SLUG,
    ), foogallery_admin_menu_parent_slug() ) );
}

/**
 * DEPRECATED!
 *
 * @return string The Url to the FooGallery extensions page in admin
 */
function foogallery_admin_extensions_url() {
    return foogallery_admin_extensions_url();
}

/**
 * Returns the FooGallery features page Url within the admin
 *
 * @return string The Url to the FooGallery extensions page in admin
 */
function foogallery_admin_features_url() {
    return admin_url( add_query_arg( array(
        'page' => FOOGALLERY_ADMIN_MENU_FEATURES_SLUG,
    ), foogallery_admin_menu_parent_slug() ) );
}

/**
 * Returns the FooGallery system info page Url within the admin
 *
 * @return string The Url to the FooGallery system info page in admin
 */
function foogallery_admin_systeminfo_url() {
    return admin_url( add_query_arg( array(
        'page' => FOOGALLERY_ADMIN_MENU_SYSTEMINFO_SLUG,
    ), foogallery_admin_menu_parent_slug() ) );
}

/**
 * Returns the FooGallery pricing page Url within the admin
 *
 * @return string The Url to the FooGallery pricing page in admin
 */
function foogallery_admin_pricing_url() {
    return admin_url( add_query_arg( array(
        'page' => FOOGALLERY_ADMIN_MENU_PRICING_SLUG,
    ), foogallery_admin_menu_parent_slug() ) );
}

/**
 * Returns the FooGallery free trial pricing page Url within the admin
 *
 * @return string The Url to the FooGallery free trial page in admin
 */
function foogallery_admin_freetrial_url() {
    return add_query_arg( 'trial', 'true', foogallery_admin_pricing_url() );
}

/**
 * Get a foogallery template setting for the current foogallery that is being output to the frontend
 * @param string	$key
 * @param string	$default
 *
 * @return mixed
 */
function foogallery_gallery_template_setting(  $key, $default = ''  ) {
    global $current_foogallery;
    global $current_foogallery_arguments;
    global $current_foogallery_template;
    $settings_key = "{$current_foogallery_template}_{$key}";
    if ( $current_foogallery_arguments && array_key_exists( $key, $current_foogallery_arguments ) ) {
        //try to get the value from the arguments
        $value = $current_foogallery_arguments[$key];
    } else {
        if ( !empty( $current_foogallery ) && $current_foogallery->settings && array_key_exists( $settings_key, $current_foogallery->settings ) ) {
            //then get the value out of the saved gallery settings
            $value = $current_foogallery->settings[$settings_key];
        } else {
            //otherwise set it to the default
            $value = $default;
        }
    }
    $value = apply_filters( 'foogallery_gallery_template_setting-' . $key, $value );
    return $value;
}

/**
 * Returns the gallery template setting for lightbox
 *
 * @return string
 */
function foogallery_gallery_template_setting_lightbox() {
    return foogallery_gallery_template_setting( 'lightbox', 'foogallery' );
}

/**
 * Get the admin menu parent slug
 * @return string
 */
function foogallery_admin_menu_parent_slug() {
    return apply_filters( 'foogallery_admin_menu_parent_slug', FOOGALLERY_ADMIN_MENU_PARENT_SLUG );
}

/**
 * Helper function to build up the admin menu Url
 * @param array $extra_args
 *
 * @return string|void
 */
function foogallery_build_admin_menu_url(  $extra_args = array()  ) {
    $url = admin_url( foogallery_admin_menu_parent_slug() );
    if ( !empty( $extra_args ) ) {
        $url = add_query_arg( $extra_args, $url );
    }
    return $url;
}

/**
 * Helper function for adding a foogallery sub menu
 *
 * @param $menu_title
 * @param string $capability
 * @param string $menu_slug
 * @param $function
 */
function foogallery_add_submenu_page(
    $menu_title,
    $capability,
    $menu_slug,
    $function
) {
    add_submenu_page(
        foogallery_admin_menu_parent_slug(),
        $menu_title,
        $menu_title,
        apply_filters( 'foogallery_admin_menu_capability', $capability ),
        $menu_slug,
        $function
    );
}

/**
 * Returns all FooGallery galleries
 *
 * @return FooGallery[] array of FooGallery galleries
 */
function foogallery_get_all_galleries(  $excludes = false, $extra_args = false  ) {
    $args = array(
        'post_type'     => FOOGALLERY_CPT_GALLERY,
        'post_status'   => array('publish', 'draft'),
        'cache_results' => false,
        'nopaging'      => true,
    );
    if ( is_array( $excludes ) ) {
        $args['post__not_in'] = $excludes;
    }
    if ( is_array( $extra_args ) ) {
        $args = array_merge( $args, $extra_args );
    }
    $gallery_posts = get_posts( $args );
    if ( empty( $gallery_posts ) ) {
        return array();
    }
    $galleries = array();
    foreach ( $gallery_posts as $post ) {
        $galleries[] = FooGallery::get( $post );
    }
    return $galleries;
}

/**
 * Parse some content and return an array of all gallery shortcodes that are used inside it
 *
 * @param $content The content to search for gallery shortcodes
 *
 * @return array An array of all the foogallery shortcodes found in the content
 */
function foogallery_extract_gallery_shortcodes(  $content  ) {
    $shortcodes = array();
    $regex_pattern = foogallery_gallery_shortcode_regex();
    if ( preg_match_all( '/' . $regex_pattern . '/s', $content, $matches ) ) {
        for ($i = 0; $i < count( $matches[0] ); ++$i) {
            $shortcode = $matches[0][$i];
            $args = $matches[3][$i];
            $attribure_string = str_replace( ' ', '&', trim( $args ) );
            $attribure_string = str_replace( '"', '', $attribure_string );
            $attributes = wp_parse_args( $attribure_string );
            if ( array_key_exists( 'id', $attributes ) ) {
                $id = intval( $attributes['id'] );
                $shortcodes[$id] = $shortcode;
            }
        }
    }
    return $shortcodes;
}

/**
 * Build up the FooGallery shortcode regex
 *
 * @return string
 */
function foogallery_gallery_shortcode_regex() {
    $tag = foogallery_gallery_shortcode_tag();
    return '\\[' . '(\\[?)' . "({$tag})" . '(?![\\w-])' . '(' . '[^\\]\\/]*' . '(?:' . '\\/(?!\\])' . '[^\\]\\/]*' . ')*?' . ')' . '(?:' . '(\\/)' . '\\]' . '|' . '\\]' . '(?:' . '(' . '[^\\[]*+' . '(?:' . '\\[(?!\\/\\2\\])' . '[^\\[]*+' . ')*+' . ')' . '\\[\\/\\2\\]' . ')?' . ')' . '(\\]?)';
    // 6: Optional second closing bracket for escaping shortcodes: [[tag]]
}

/**
 * Builds up a class attribute that can be used in a gallery template
 * @param $gallery FooGallery
 *
 * @return string the classname based on the gallery and any extra attributes
 */
function foogallery_build_class_attribute(  $gallery  ) {
    $classes[] = 'foogallery';
    $classes[] = 'foogallery-container';
    $classes[] = "foogallery-{$gallery->gallery_template}";
    $num_args = func_num_args();
    if ( $num_args > 1 ) {
        $arg_list = func_get_args();
        for ($i = 1; $i < $num_args; $i++) {
            $classes[] = $arg_list[$i];
        }
    }
    $classes = apply_filters( 'foogallery_build_class_attribute', $classes, $gallery );
    //extract any classes from the gallery arguments
    global $current_foogallery_arguments;
    if ( isset( $current_foogallery_arguments ) && is_array( $current_foogallery_arguments ) ) {
        if ( array_key_exists( 'classname', $current_foogallery_arguments ) ) {
            $classes[] = $current_foogallery_arguments['classname'];
        }
        if ( array_key_exists( 'classes', $current_foogallery_arguments ) ) {
            $classes[] = $current_foogallery_arguments['classes'];
        }
    }
    $classes = array_filter( $classes, 'strlen' );
    return implode( ' ', $classes );
}

/**
 * Builds up a SAFE class attribute that can be used in a gallery template
 * @param $gallery FooGallery
 *
 * @return string the classname based on the gallery and any extra attributes
 */
function foogallery_build_class_attribute_safe(  $gallery  ) {
    $args = func_get_args();
    $result = call_user_func_array( "foogallery_build_class_attribute", $args );
    return esc_attr( $result );
}

/**
 * Renders an escaped class attribute that can be used directly by gallery templates
 *
 * @param $gallery FooGallery
 */
function foogallery_build_class_attribute_render_safe(  $gallery  ) {
    $args = func_get_args();
    $result = call_user_func_array( "foogallery_build_class_attribute_safe", $args );
    echo $result;
}

/**
 * Builds up the attributes that are appended to a gallery template container
 *
 * @param $gallery    FooGallery
 * @param $attributes array
 *
 * @return string
 */
function foogallery_build_container_attributes_safe(  $gallery, $attributes  ) {
    //add the default gallery id
    $attributes['id'] = $gallery->container_id();
    //add the standard data-foogallery attribute so that the JS initializes correctly
    $attributes['data-foogallery'] = foogallery_build_container_data_options( $gallery, $attributes );
    //allow others to add their own attributes globally
    $attributes = apply_filters( 'foogallery_build_container_attributes', $attributes, $gallery );
    //allow others to add their own attributes for a specific gallery template
    $attributes = apply_filters( 'foogallery_build_container_attributes-' . $gallery->gallery_template, $attributes, $gallery );
    //clean up the attributes to make them safe for output
    $html = '';
    foreach ( $attributes as $key => $value ) {
        $safe_value = esc_attr( $value );
        $html .= "{$key}=\"{$safe_value}\" ";
    }
    return apply_filters(
        'foogallery_build_container_attributes_html',
        $html,
        $attributes,
        $gallery
    );
}

/**
 * Builds up the data-foogallery attribute options that is used by the core javascript
 *
 * @param $gallery
 * @param $attributes
 *
 * @return string
 */
function foogallery_build_container_data_options(  $gallery, $attributes  ) {
    $options = apply_filters(
        'foogallery_build_container_data_options',
        array(),
        $gallery,
        $attributes
    );
    $options = apply_filters(
        'foogallery_build_container_data_options-' . $gallery->gallery_template,
        $options,
        $gallery,
        $attributes
    );
    return foogallery_json_encode( $options );
}

/**
 * Render a foogallery
 *
 * @param       $gallery_id int The id of the foogallery you want to render
 * @param array $args
 */
function foogallery_render_gallery(  $gallery_id, $args = array()  ) {
    //create new instance of template engine
    $engine = new FooGallery_Template_Loader();
    $shortcode_args = wp_parse_args( $args, array(
        'id' => $gallery_id,
    ) );
    $engine->render_template( $shortcode_args );
}

/**
 * Returns the available sorting options that can be chosen for galleries and albums
 */
function foogallery_sorting_options() {
    return apply_filters( 'foogallery_sorting_options', array(
        ''              => __( 'Default', 'foogallery' ),
        'date_desc'     => __( 'Date created - newest first', 'foogallery' ),
        'date_asc'      => __( 'Date created - oldest first', 'foogallery' ),
        'modified_desc' => __( 'Date modified - most recent first', 'foogallery' ),
        'modified_asc'  => __( 'Date modified - most recent last', 'foogallery' ),
        'title_asc'     => __( 'Title - alphabetically', 'foogallery' ),
        'title_desc'    => __( 'Title - reverse', 'foogallery' ),
        'rand'          => __( 'Random', 'foogallery' ),
    ) );
}

function foogallery_sorting_get_posts_orderby_arg(  $sorting_option  ) {
    $orderby_arg = 'post__in';
    switch ( $sorting_option ) {
        case 'date_desc':
        case 'date_asc':
            $orderby_arg = 'date';
            break;
        case 'modified_desc':
        case 'modified_asc':
            $orderby_arg = 'modified';
            break;
        case 'title_asc':
        case 'title_desc':
            $orderby_arg = 'title';
            break;
        case 'rand':
            $orderby_arg = 'rand';
            break;
    }
    return apply_filters( 'foogallery_sorting_get_posts_orderby_arg', $orderby_arg, $sorting_option );
}

function foogallery_sorting_get_posts_order_arg(  $sorting_option  ) {
    $order_arg = 'DESC';
    switch ( $sorting_option ) {
        case 'date_asc':
        case 'modified_asc':
        case 'title_asc':
            $order_arg = 'ASC';
            break;
    }
    return apply_filters( 'foogallery_sorting_get_posts_order_arg', $order_arg, $sorting_option );
}

/**
 * @deprecated 1.4.7 Default templates loaded by default and no longer activated via extension
 *
 * Activate the default templates extension when there are no gallery templates loaded
 */
function foogallery_activate_default_templates_extension() {
    //no longer needed but left in case any 3rd party extensions call this function
    _deprecated_function( __FUNCTION__, '1.4.7' );
}

/**
 * Allow FooGallery to enqueue stylesheet and allow them to be enqueued in the head on the next page load
 *
 * @param $handle string
 * @param $src string
 * @param array $deps
 * @param bool $ver
 * @param string $media
 */
function foogallery_enqueue_style(
    $handle,
    $src,
    $deps = array(),
    $ver = false,
    $media = 'all'
) {
    $src = apply_filters( 'foogallery_enqueue_style_src', $src, $handle );
    wp_enqueue_style(
        $handle,
        $src,
        $deps,
        $ver,
        $media
    );
    do_action(
        'foogallery_enqueue_style',
        $handle,
        $src,
        $deps,
        $ver,
        $media
    );
}

/**
 * Returns all foogallery post objects that are attached to the post
 *
 * @param $post_id int The ID of the post
 *
 * @return array List of foogallery posts.
 */
function foogallery_get_galleries_attached_to_post(  $post_id  ) {
    $gallery_ids = get_post_meta( $post_id, FOOGALLERY_META_POST_USAGE, false );
    if ( !empty( $gallery_ids ) ) {
        return get_posts( array(
            'post_type'      => array(FOOGALLERY_CPT_GALLERY),
            'post_status'    => array('draft', 'publish'),
            'posts_per_page' => -1,
            'include'        => $gallery_ids,
        ) );
    }
    return array();
}

/**
 * Clears all css load optimization post meta
 */
function foogallery_clear_all_css_load_optimizations() {
    delete_post_meta_by_key( FOOGALLERY_META_POST_USAGE_CSS );
}

/**
 * Performs a check to see if the plugin has been updated, and perform any housekeeping if necessary
 */
function foogallery_perform_version_check() {
    $checker = new FooGallery_Version_Check();
    $checker->perform_check();
}

/**
 * Returns the JPEG quality used when generating thumbnails
 *
 * @return int The quality value stored in settings
 */
function foogallery_thumbnail_jpeg_quality() {
    $quality = intval( foogallery_get_setting( 'thumb_jpeg_quality' ) );
    //check if we get an invalid value for whatever reason and if so return a default of 80
    if ( $quality <= 0 ) {
        $quality = 80;
    }
    return $quality;
}

/**
 * Returns the caption title source setting
 *
 * @return string
 */
function foogallery_caption_title_source() {
    $source = foogallery_get_setting( 'caption_title_source', 'caption' );
    if ( empty( $source ) ) {
        $source = 'caption';
    }
    return $source;
}

/**
 * Returns the attachment caption title based on the caption_title_source setting
 *
 * @param WP_Post $attachment_post
 * @param bool $source
 *
 * @return string
 */
function foogallery_get_caption_title_for_attachment(  $attachment_post, $source = false  ) {
    if ( false === $source ) {
        $source = foogallery_gallery_template_setting( 'caption_title_source', false );
        if ( empty( $source ) || "none" === $source ) {
            $source = foogallery_caption_title_source();
        }
    }
    switch ( $source ) {
        case 'title':
            $caption = trim( $attachment_post->post_title );
            break;
        case 'desc':
            $caption = trim( $attachment_post->post_content );
            break;
        case 'alt':
            $caption = trim( get_post_meta( $attachment_post->ID, '_wp_attachment_image_alt', true ) );
            break;
        default:
            $caption = trim( $attachment_post->post_excerpt );
    }
    return apply_filters( 'foogallery_get_caption_title_for_attachment', $caption, $attachment_post );
}

/**
 * Returns the attachment caption title based on the caption_title_source setting
 *
 * @param FooGalleryAttachment $attachment
 * @param string $source
 * @param string $caption_type The type of caption (title or desc)
 *
 * @return string
 */
function foogallery_get_caption_by_source(  $attachment, $source, $caption_type  ) {
    if ( false === $source ) {
        $source = foogallery_gallery_template_setting( 'caption_' . $caption_type . '_source', false );
        if ( empty( $source ) || "none" === $source ) {
            if ( 'title' === $caption_type ) {
                $source = 'caption';
                //bad legacy naming!
            } else {
                $source = $caption_type;
            }
        }
    }
    switch ( $source ) {
        case 'title':
            $caption = trim( $attachment->title );
            break;
        case 'desc':
            $caption = trim( $attachment->description );
            break;
        case 'alt':
            $caption = trim( $attachment->alt );
            break;
        case 'caption':
        default:
            $caption = trim( $attachment->caption );
    }
    return apply_filters(
        'foogallery_get_caption_by_source',
        $caption,
        $attachment,
        $source,
        $caption_type
    );
}

/**
 * Returns the caption description source setting
 *
 * @return string
 */
function foogallery_caption_desc_source() {
    $source = foogallery_get_setting( 'caption_desc_source', 'desc' );
    if ( empty( $source ) ) {
        $source = 'desc';
    }
    return $source;
}

/**
 * Returns the attachment caption description based on the caption_desc_source setting
 *
 * @param WP_Post $attachment_post
 * @param bool $source
 *
 * @return string
 */
function foogallery_get_caption_desc_for_attachment(  $attachment_post, $source = false  ) {
    if ( false === $source ) {
        $source = foogallery_gallery_template_setting( 'caption_desc_source', false );
        if ( empty( $source ) || "none" === $source ) {
            $source = foogallery_caption_desc_source();
        }
    }
    switch ( $source ) {
        case 'title':
            $caption = trim( $attachment_post->post_title );
            break;
        case 'caption':
            $caption = trim( $attachment_post->post_excerpt );
            break;
        case 'alt':
            $caption = trim( get_post_meta( $attachment_post->ID, '_wp_attachment_image_alt', true ) );
            break;
        default:
            $caption = trim( $attachment_post->post_content );
    }
    return apply_filters( 'foogallery_get_caption_desc_for_attachment', $caption, $attachment_post );
}

/**
 * Runs thumbnail tests and outputs results in a table format
 */
function foogallery_output_thumbnail_generation_results() {
    $thumbs = new FooGallery_Thumbnails();
    try {
        $results = $thumbs->run_thumbnail_generation_tests();
        if ( $results['success'] ) {
            echo '<span style="color:#0c0">' . __( 'Thumbnail generation test ran successfully.', 'foogallery' ) . '</span>';
        } else {
            echo '<span style="color:#c00">' . __( 'Thumbnail generation test failed!', 'foogallery' ) . '</span>';
            var_dump( $results['error'] );
            var_dump( $results['file_info'] );
        }
    } catch ( Exception $e ) {
        echo 'Exception: ' . $e->getMessage();
    }
}

/**
 * Returns the URL to the test image
 *
 * @return string
 */
function foogallery_test_thumb_url() {
    return apply_filters( 'foogallery_test_thumb_url', FOOGALLERY_URL . 'assets/logo.png' );
}

/**
 * Return all the gallery datasources used within FooGallery
 *
 * @return array
 */
function foogallery_gallery_datasources() {
    $default_datasource = foogallery_default_datasource();
    $datasources[$default_datasource] = array(
        'id'     => $default_datasource,
        'name'   => __( 'Media Library', 'foogalery' ),
        'label'  => __( 'From Media Library', 'foogallery' ),
        'public' => false,
    );
    return apply_filters( 'foogallery_gallery_datasources', $datasources );
}

/**
 * Returns the default gallery datasource
 *
 * @return string
 */
function foogallery_default_datasource() {
    return foogallery_get_default( 'datasource', 'media_library' );
}

/**
 * Returns the src to the built-in image placeholder
 * @return string
 */
function foogallery_image_placeholder_src() {
    return apply_filters( 'foogallery_image_placeholder_src', FOOGALLERY_URL . 'assets/image-placeholder.png' );
}

/**
 * Returns the image html for the built-in image placeholder
 *
 * @param array $args
 *
 * @return string
 */
function foogallery_image_placeholder_html(  $args  ) {
    if ( !isset( $args ) ) {
        $args = array(
            'width'  => 150,
            'height' => 150,
        );
    }
    $args['src'] = foogallery_image_placeholder_src();
    $args = array_map( 'esc_attr', $args );
    $html = '<img ';
    foreach ( $args as $name => $value ) {
        $html .= " {$name}=" . '"' . $value . '"';
    }
    $html .= ' />';
    return apply_filters( 'foogallery_image_placeholder_html', $html, $args );
}

/**
 * Returns the thumbnail html for the featured attachment for a gallery.
 * If no featured attachment can be found, then a placeholder image src is returned instead
 *
 * @param FooGallery $gallery
 * @param array $args
 *
 * @return string
 */
function foogallery_find_featured_attachment_thumbnail_html(  $gallery, $args = null  ) {
    if ( !isset( $gallery ) || false === $gallery ) {
        return '';
    }
    if ( !isset( $args ) ) {
        $args = array(
            'width'  => 150,
            'height' => 150,
        );
    }
    $featuredAttachment = $gallery->featured_attachment();
    if ( $featuredAttachment ) {
        return $featuredAttachment->html_img( $args );
    } else {
        //if we have no featured attachment, then use the built-in image placeholder
        return foogallery_image_placeholder_html( $args );
    }
}

/**
 * Returns the thumbnail src for the featured attachment for a gallery.
 * If no featured attachment can be found, then a placeholder image src is returned instead
 *
 * @param FooGallery $gallery
 * @param array $args
 *
 * @return string
 */
function foogallery_find_featured_attachment_thumbnail_src(  $gallery, $args = null  ) {
    if ( !isset( $gallery ) || false === $gallery ) {
        return '';
    }
    if ( !isset( $args ) ) {
        $args = array(
            'width'  => 150,
            'height' => 150,
        );
    }
    $featuredAttachment = $gallery->featured_attachment();
    if ( $featuredAttachment ) {
        return $featuredAttachment->html_img_src( $args );
    } else {
        //if we have no featured attachment, then use the built-in image placeholder
        return foogallery_image_placeholder_src();
    }
}

/**
 * Returns the available retina options that can be chosen
 */
function foogallery_retina_options() {
    return apply_filters( 'foogallery_retina_options', array(
        '2x' => __( '2x', 'foogallery' ),
        '3x' => __( '3x', 'foogallery' ),
        '4x' => __( '4x', 'foogallery' ),
    ) );
}

/**
 * Does a full uninstall of the plugin including all data and settings!
 */
function foogallery_uninstall() {
    if ( !current_user_can( 'install_plugins' ) ) {
        exit;
    }
    //delete all gallery posts first
    global $wpdb;
    $query = "SELECT p.ID FROM {$wpdb->posts} AS p WHERE p.post_type IN (%s)";
    $gallery_post_ids = $wpdb->get_col( $wpdb->prepare( $query, FOOGALLERY_CPT_GALLERY ) );
    if ( !empty( $gallery_post_ids ) ) {
        $deleted = 0;
        foreach ( $gallery_post_ids as $post_id ) {
            $del = wp_delete_post( $post_id );
            if ( false !== $del ) {
                ++$deleted;
            }
        }
    }
    //delete all options
    if ( is_network_admin() ) {
        delete_site_option( FOOGALLERY_SLUG );
    } else {
        delete_option( FOOGALLERY_SLUG );
    }
    delete_option( FOOGALLERY_OPTION_VERSION );
    delete_option( FOOGALLERY_OPTION_THUMB_TEST );
    delete_option( FOOGALLERY_EXTENSIONS_ACTIVATED_OPTIONS_KEY );
    delete_option( FOOGALLERY_EXTENSIONS_ERRORS_OPTIONS_KEY );
    //let any extensions clean up after themselves
    do_action( 'foogallery_uninstall' );
}

/**
 * Returns an attachment field friendly name, based on a field name that is passed in
 *
 * @param $field
 *
 * @return string
 */
function foogallery_get_attachment_field_friendly_name(  $field  ) {
    switch ( $field ) {
        case 'title':
            return __( 'Attachment Title', 'foogallery' );
        case 'caption':
            return __( 'Attachment Caption', 'foogallery' );
        case 'desc':
            return __( 'Attachment Description', 'foogallery' );
        case 'alt':
            return __( 'Attachment Alt', 'foogallery' );
    }
}

/**
 * Returns the fields for a specific gallery template
 *
 * @param $template mixed
 * @return mixed
 */
function foogallery_get_fields_for_template(  $template  ) {
    if ( is_string( $template ) ) {
        $template = foogallery_get_gallery_template( $template );
    }
    $fields = $template['fields'];
    // Allow for extensions to override fields for every gallery template.
    // Also passes the $template along so you can inspect and conditionally alter fields based on the template properties
    $fields = apply_filters( 'foogallery_override_gallery_template_fields', $fields, $template );
    // Allow for extensions to override fields for a specific gallery template.
    // Also passes the $template along so you can inspect and conditionally alter fields based on the template properties
    $fields = apply_filters( "foogallery_override_gallery_template_fields-{$template['slug']}", $fields, $template );
    // Easily remove fields.
    $fields_to_remove = apply_filters( 'foogallery_override_gallery_template_fields_remove', array(), $template );
    $fields_to_remove = apply_filters( "foogallery_override_gallery_template_fields_remove-{$template['slug']}", $fields_to_remove );
    // Easily set defaults for fields.
    $override_fields_defaults = apply_filters( 'foogallery_override_gallery_template_fields_defaults', array(), $template );
    $override_fields_defaults = apply_filters( "foogallery_override_gallery_template_fields_defaults-{$template['slug']}", $override_fields_defaults );
    // Easily hide certain fields.
    $fields_to_hide = apply_filters( 'foogallery_override_gallery_template_fields_hidden', array(), $template );
    $fields_to_hide = apply_filters( "foogallery_override_gallery_template_fields_hidden-{$template['slug']}", $fields_to_hide );
    $indexes_to_remove = array();
    foreach ( $fields as $key => &$field ) {
        // Allow for the field to be altered by extensions. Also used by the build-in fields, e.g. lightbox.
        $field = apply_filters( 'foogallery_alter_gallery_template_field', $field, $template['slug'] );
        if ( in_array( $field['id'], $fields_to_remove ) ) {
            $indexes_to_remove[] = $key;
        } else {
            // Last time to set field defaults.
            if ( array_key_exists( $field['id'], $override_fields_defaults ) ) {
                $field['default'] = $override_fields_defaults[$field['id']];
            }
            // Make fields invisible.
            if ( in_array( $field['id'], $fields_to_hide ) ) {
                // Make sure the field is not visible.
                $field['row_data']['data-foogallery-invisible'] = true;
                // Force the field to not be hidden, which means it's values can be used in previews.
                if ( isset( $field['row_data']['data-foogallery-hidden'] ) ) {
                    unset($field['row_data']['data-foogallery-hidden']);
                }
                // Remove the conditionals to FORCE the field to never be shown.
                if ( isset( $field['row_data']['data-foogallery-show-when-field'] ) ) {
                    unset($field['row_data']['data-foogallery-show-when-field']);
                }
                if ( isset( $field['row_data']['data-foogallery-show-when-field-value'] ) ) {
                    unset($field['row_data']['data-foogallery-show-when-field-value']);
                }
            }
        }
    }
    // remove the fields that were marked for removal.
    foreach ( $indexes_to_remove as $index ) {
        unset($fields[$index]);
    }
    // Finally, sort the fields.
    uasort( $fields, 'foogallery_sort_template_fields' );
    return $fields;
}

/**
 * Used to sort gallery template fields
 *
 * @param mixed $a
 * @param mixed $b
 *
 * @return int
 */
function foogallery_sort_template_fields(  $a, $b  ) {
    if ( isset( $a['order'] ) && isset( $b['order'] ) ) {
        if ( $a['order'] === $b['order'] ) {
            return 0;
        }
        return ( $a['order'] < $b['order'] ? -1 : 1 );
    }
    return 0;
}

/**
 * Builds default settings for the supplied gallery template
 *
 * @param $template_name
 * @return array
 */
function foogallery_build_default_settings_for_gallery_template(  $template_name  ) {
    $fields = foogallery_get_fields_for_template( $template_name );
    $settings = array();
    //loop through the fields and build up an array of keys and default values
    foreach ( $fields as $field ) {
        $default = ( array_key_exists( 'default', $field ) ? $field['default'] : false );
        if ( !empty( $default ) ) {
            $settings["{$template_name}_{$field['id']}"] = $default;
        }
    }
    return $settings;
}

/**
 * Returns the choices used for the thumb link field type
 * @return array
 */
function foogallery_gallery_template_field_thumb_link_choices() {
    return apply_filters( 'foogallery_gallery_template_field_thumb_links', array(
        'image'  => __( 'Full Size Image', 'foogallery' ),
        'page'   => __( 'Image Attachment Page', 'foogallery' ),
        'custom' => __( 'Custom URL', 'foogallery' ),
        'none'   => __( 'Not linked', 'foogallery' ),
    ) );
}

/**
 * Returns the choices used for the lightbox field type
 * @return array
 */
function foogallery_gallery_template_field_lightbox_choices() {
    $lightboxes = apply_filters( 'foogallery_gallery_template_field_lightboxes', array() );
    $lightboxes['none'] = __( 'None', 'foogallery' );
    return $lightboxes;
}

if ( !function_exists( 'wp_get_raw_referer' ) ) {
    /**
     * Retrieves unvalidated referer from '_wp_http_referer' or HTTP referer.
     *
     * Do not use for redirects, use {@see wp_get_referer()} instead.
     *
     * @since 1.4.9
     * @return string|false Referer URL on success, false on failure.
     */
    function wp_get_raw_referer() {
        if ( !empty( $_REQUEST['_wp_http_referer'] ) ) {
            return wp_unslash( $_REQUEST['_wp_http_referer'] );
        } else {
            if ( !empty( $_SERVER['HTTP_REFERER'] ) ) {
                return wp_unslash( $_SERVER['HTTP_REFERER'] );
            }
        }
        return false;
    }

}
/**
 * Return the attachments for the currently displayed gallery
 *
 * @return array
 */
function foogallery_current_gallery_attachments_for_rendering() {
    global $current_foogallery;
    $attachments = apply_filters( 'foogallery_gallery_attachments_override_for_rendering', false, $current_foogallery );
    if ( $attachments !== false ) {
        return $attachments;
    }
    // by default, return all attachments.
    return $current_foogallery->attachments();
}

/**
 * Return attachment ID from a URL
 *
 * @param $url String URL to the image we are checking
 *
 * @return null or attachment ID
 */
function foogallery_get_attachment_id_by_url(  $url  ) {
    global $wpdb;
    $query = "SELECT ID FROM {$wpdb->posts} WHERE guid=%s";
    $attachment = $wpdb->get_col( $wpdb->prepare( $query, $url ) );
    if ( count( $attachment ) > 0 ) {
        return $attachment[0];
    }
    return null;
}

/**
 * Safer escaping for HTML attributes.
 *
 * @since 1.4.31
 *
 * @param string $text
 * @return string
 */
function foogallery_esc_attr(  $text  ) {
    $safe_text = wp_check_invalid_utf8( $text );
    $safe_text = _wp_specialchars(
        $safe_text,
        ENT_QUOTES,
        false,
        true
    );
    return $safe_text;
}

/**
 * Create a FooGallery and return the ID
 *
 * @param $template
 * @param $attachment_ids
 *
 * @return int
 */
function foogallery_create_gallery(  $template, $attachment_ids  ) {
    if ( empty( $template ) ) {
        $template = foogallery_default_gallery_template();
    }
    //create an empty foogallery
    $foogallery_args = array(
        'post_title'  => 'Demo Gallery',
        'post_type'   => FOOGALLERY_CPT_GALLERY,
        'post_status' => 'publish',
    );
    $gallery_id = wp_insert_post( $foogallery_args );
    //set a gallery template
    add_post_meta(
        $gallery_id,
        FOOGALLERY_META_TEMPLATE,
        $template,
        true
    );
    $settings = array();
    //set default settings if there are any, and also if the template is the same as the default
    if ( foogallery_default_gallery_template() === $template ) {
        $default_gallery_id = foogallery_get_setting( 'default_gallery_settings' );
        if ( $default_gallery_id ) {
            $settings = get_post_meta( $default_gallery_id, FOOGALLERY_META_SETTINGS, true );
            add_post_meta(
                $gallery_id,
                FOOGALLERY_META_SETTINGS,
                $settings,
                true
            );
        }
    }
    if ( empty( $settings ) ) {
        switch ( $template ) {
            case 'masonry':
                $settings = array(
                    'foogallery_items_view'                   => 'preview',
                    'masonry_alignment'                       => 'fg-center',
                    'masonry_border_size'                     => 'fg-border-thin',
                    'masonry_caption_desc_source'             => '',
                    'masonry_caption_title_source'            => '',
                    'masonry_captions_limit_length'           => '',
                    'masonry_custom_settings'                 => '',
                    'masonry_drop_shadow'                     => 'fg-shadow-outline',
                    'masonry_filtering_type'                  => '',
                    'masonry_gutter_width'                    => '10',
                    'masonry_hover_effect_caption_visibility' => 'fg-captions-bottom',
                    'masonry_hover_effect_color'              => '',
                    'masonry_hover_effect_icon'               => 'fg-hover-zoom',
                    'masonry_hover_effect_preset'             => 'fg-custom',
                    'masonry_hover_effect_scale'              => '',
                    'masonry_hover_effect_transition'         => 'fg-hover-fade',
                    'masonry_inner_shadow'                    => '',
                    'masonry_layout'                          => 'fixed',
                    'masonry_lazyload'                        => '',
                    'masonry_lightbox'                        => 'foobox',
                    'masonry_loaded_effect'                   => 'fg-loaded-fade-in',
                    'masonry_loading_icon'                    => 'fg-loading-default',
                    'masonry_paging_type'                     => '',
                    'masonry_rounded_corners'                 => '',
                    'masonry_state'                           => 'no',
                    'masonry_theme'                           => 'fg-dark',
                    'masonry_thumbnail_link'                  => 'image',
                    'masonry_thumbnail_width'                 => '250',
                    'masonry_video_autoplay'                  => 'yes',
                    'masonry_video_hover_icon'                => 'fg-video-default',
                    'masonry_video_size'                      => '640x360',
                    'masonry_video_sticky_icon'               => '',
                );
        }
    }
    add_post_meta(
        $gallery_id,
        FOOGALLERY_META_SETTINGS,
        $settings,
        true
    );
    $attachments = explode( ',', $attachment_ids );
    update_post_meta( $gallery_id, FOOGALLERY_META_ATTACHMENTS, $attachments );
    return $gallery_id;
}

/**
 * Returns an array of marketing demos
 * @return array
 */
function foogallery_marketing_demos() {
    $demos = array();
    $demos[] = array(
        'demo'    => __( 'Responsive Image Gallery', 'foogallery' ),
        'section' => __( 'Standard Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/responsive-image-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Masonry Image Gallery', 'foogallery' ),
        'section' => __( 'Standard Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/masonry-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Justified Gallery', 'foogallery' ),
        'section' => __( 'Standard Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/justified-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Image Viewer Gallery', 'foogallery' ),
        'section' => __( 'Standard Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/image-viewer-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Simple Portfolio Gallery', 'foogallery' ),
        'section' => __( 'Standard Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/wordpress-portfolio-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Single Thumbnail Gallery', 'foogallery' ),
        'section' => __( 'Standard Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/single-thumbnail-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Grid PRO Gallery', 'foogallery' ),
        'section' => __( 'PRO Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/grid-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Polaroid PRO Gallery', 'foogallery' ),
        'section' => __( 'PRO Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/polaroid-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Slider PRO Gallery', 'foogallery' ),
        'section' => __( 'PRO Gallery Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/slider-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Hover Presets Demo', 'foogallery' ),
        'section' => __( 'PRO Features', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/hover-presets/',
    );
    $demos[] = array(
        'demo'    => __( 'Filtering Demos', 'foogallery' ),
        'section' => __( 'PRO Features', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/filtering/',
    );
    $demos[] = array(
        'demo'    => __( 'Pagination Types Demo', 'foogallery' ),
        'section' => __( 'PRO Features', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/pagination/',
    );
    $demos[] = array(
        'demo'    => __( 'Video Gallery Demos', 'foogallery' ),
        'section' => __( 'PRO Features', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/video-gallery/',
    );
    $demos[] = array(
        'demo'    => __( 'Bulk Copy (admin)', 'foogallery' ),
        'section' => __( 'PRO Features', 'foogallery' ),
        'href'    => 'https://fooplugins.com/bulk-copy-foogallery-pro/',
    );
    $demos[] = array(
        'demo'    => __( 'Albums', 'foogallery' ),
        'section' => __( 'Album Demos', 'foogallery' ),
        'href'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/wordpress-album-gallery/',
    );
    return $demos;
}

/**
 * Returns an array of the PRO features
 * @return array
 */
function foogallery_marketing_pro_features() {
    $features[] = array(
        'feature' => __( 'Video Galleries', 'foogallery' ),
        'desc'    => __( 'Create beautiful video galleries from YouTube, Vimeo, Facebook, Wistia and more!', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/video-gallery/',
    );
    $features[] = array(
        'feature' => __( 'Media Tags + Filtering', 'foogallery' ),
        'desc'    => __( 'Assign tags to your media, which allows visitors to filter the galleries by tag.', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/filtering/',
    );
    $features[] = array(
        'feature' => __( 'More Gallery Templates', 'foogallery' ),
        'desc'    => __( '3 more awesome gallery templates, including Slider, Grid and Polaroid.', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/slider-gallery/',
    );
    $features[] = array(
        'feature' => __( 'Preset Hover Effects', 'foogallery' ),
        'desc'    => __( 'Choose from 11 beautifully designed preset hover effects.', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/hover-presets/',
    );
    $features[] = array(
        'feature' => __( 'Advanced Pagination + Infinite Scroll', 'foogallery' ),
        'desc'    => __( 'Choose from more paging types like numbered, load more or infinite scroll.', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/pagination/',
    );
    $features[] = array(
        'feature' => __( 'Animated Loading Effects', 'foogallery' ),
        'desc'    => __( 'Choose from 9 awesome animation effects to display as your galleries load.', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/foogallery-wordpress-gallery-plugin/animated-loaded-effects/',
    );
    $features[] = array(
        'feature' => __( 'Bulk Copy Settings', 'foogallery' ),
        'desc'    => __( 'Bulk copy your gallery settings to other galleries in a flash.', 'foogallery' ),
        'demo'    => 'https://fooplugins.com/bulk-copy-foogallery-pro/',
    );
    return $features;
}

/**
 * Returns the allowed post types that galleries can be attached to
 * @return array
 */
function foogallery_allowed_post_types_for_usage() {
    $allowed_post_types = apply_filters( 'foogallery_allowed_post_types_for_attachment', array('post', 'page') );
    // Use foogallery_get_setting to retrieve the selected custom post types.
    $selected_custom_post_types = foogallery_get_setting( 'allowed_custom_post_types', array() );
    if ( !is_array( $selected_custom_post_types ) ) {
        $selected_custom_post_types = array();
    }
    // Merge the selected custom post types with the default allowed post types.
    $allowed_post_types = array_merge( $allowed_post_types, $selected_custom_post_types );
    return $allowed_post_types;
}

/**
 * Returns true if FooGallery is in debug mode
 * @return bool
 */
function foogallery_is_debug() {
    return foogallery_get_setting( 'enable_debugging', false );
}

/**
 * Get the current gallery in the admin
 * @param $post_gallery
 *
 * @return FooGallery|null
 */
function foogallery_admin_get_current_gallery(  $post_gallery  ) {
    global $post;
    global $current_foogallery_admin;
    if ( is_admin() && isset( $post ) ) {
        if ( !isset( $current_foogallery_admin ) || $post_gallery->ID !== $post->ID ) {
            $current_foogallery_admin = FooGallery::get( $post_gallery );
        }
        return $current_foogallery_admin;
    }
    return null;
}

/**
 * Takes an RGB string and returns an array of the colors
 * @param string $rgba RBG color string in the format rgb(0,0,0)
 *
 * @return array|int[]
 */
function foogallery_rgb_to_color_array(  $rgba  ) {
    if ( empty( $rgba ) ) {
        return array(0, 0, 0);
    }
    preg_match( '/^rgba?[\\s+]?\\([\\s+]?(\\d+)[\\s+]?,[\\s+]?(\\d+)[\\s+]?,[\\s+]?(\\d+)[\\s+]?/i', $rgba, $by_color );
    if ( count( $by_color ) >= 3 ) {
        return array($by_color[1], $by_color[2], $by_color[3]);
    }
    //return black if there was a problem getting the color
    return array(0, 0, 0);
}

/**
 * Sanitize HTML to make it safe to output. Used to sanitize potentially harmful HTML used for captions
 *
 * @since 1.9.23
 *
 * @param string $text
 * @return string
 */
function foogallery_sanitize_html(  $text  ) {
    $safe_text = wp_kses_post( $text );
    return $safe_text;
}

/**
 * Filter out JavaScript-related keywords and inline scripts from an input string
 *
 * @param string $input
 * @return string
 */
function foogallery_sanitize_javascript(  $input  ) {
    // list of JavaScript-related attributes to filter out
    $javascript_attributes = array(
        'innerHTML',
        'document\\.write',
        'eval',
        'Function\\(',
        'setTimeout',
        'setInterval',
        'new Function\\(',
        'onmouseover',
        'onmouseout',
        'onpointerenter',
        'onclick',
        'onload',
        'onchange',
        '<script>',
        '<\\/script>',
        'encodeURIComponent',
        'decodeURIComponent',
        'JSON\\.parse',
        'outerHTML',
        'innerHTML',
        'XMLHttpRequest',
        'createElement',
        'appendChild',
        'RegExp',
        'String\\.fromCharCode',
        'encodeURI',
        'decodeURI',
        'javascript:'
    );
    $pattern = '/' . implode( '|', $javascript_attributes ) . '/i';
    // Use regex to replace potentially dangerous strings with an empty string
    $input = preg_replace( $pattern, '', $input );
    return $input;
}

/**
 * Returns true if PRO is in use
 * @return bool
 */
function foogallery_is_pro() {
    $pro = false;
    return $pro;
}

/**
 * Safe function for encoding objects to json
 *
 * @param $value
 *
 * @return false|string
 */
function foogallery_json_encode(  $value  ) {
    $flags = JSON_UNESCAPED_SLASHES;
    if ( defined( 'JSON_UNESCAPED_UNICODE' ) ) {
        $flags = JSON_UNESCAPED_UNICODE | $flags;
    }
    $flags = apply_filters( 'foogallery_json_encode_flags', $flags );
    return json_encode( $value, $flags );
}

/**
 * Get a language array entry which gets a value from settings
 * @param $setting_key
 * @param $default
 *
 * @return string|false
 */
function foogallery_get_language_array_value(  $setting_key, $default  ) {
    $setting_value = foogallery_get_setting( $setting_key, $default );
    if ( empty( $setting_value ) ) {
        $setting_value = $default;
    }
    if ( $default !== $setting_value ) {
        return $setting_value;
    }
    return false;
}

/**
 * Safely returns the WP Filesystem instance for use in FooGallery
 *
 * @return WP_Filesystem_Base
 */
function foogallery_wp_filesystem() {
    global $wp_filesystem;
    if ( !function_exists( 'WP_Filesystem' ) ) {
        require_once ABSPATH . 'wp-admin/includes/file.php';
    }
    if ( !WP_Filesystem( true ) ) {
        return false;
    }
    return $wp_filesystem;
}

/**
 * Returns a formatted date
 *
 * @param        $timestamp
 * @param string $format
 *
 * @return string
 */
function foogallery_format_date(  $timestamp, $format = null  ) {
    if ( !$format ) {
        $format = get_option( 'date_format' );
    }
    if ( function_exists( 'wp_date' ) ) {
        return wp_date( $format, $timestamp );
    } else {
        $datetime = date_create( '@' . $timestamp );
        $timezone = wp_timezone();
        $datetime->setTimezone( $timezone );
        return $datetime->format( $format );
    }
}

/**
 * Shortcut method to safely check if the current gallery template supports a specific feature
 *
 * e.g. panel_support, preview_support, common_fields_support, lazyload_support, paging_support, filtering_support
 *
 * @param      $feature_to_check
 * @param bool $value_to_check
 *
 * @return bool
 */
function foogallery_current_gallery_check_template_has_supported_feature(  $feature_to_check, $value_to_check = true  ) {
    global $current_foogallery;
    //get out early if there is no current gallery
    if ( !isset( $current_foogallery ) ) {
        return false;
    }
    //check if we have previously checked before recently
    if ( isset( $current_foogallery->supports ) && is_array( $current_foogallery->supports ) && array_key_exists( $feature_to_check, $current_foogallery->supports ) ) {
        return $current_foogallery->supports[$feature_to_check] === $value_to_check;
    } else {
        //check if we need to init the array
        if ( !isset( $current_foogallery->supports ) || !is_array( $current_foogallery->supports ) ) {
            $current_foogallery->supports = array();
        }
        if ( !array_key_exists( $feature_to_check, $current_foogallery->supports ) ) {
            $template_object = foogallery_get_gallery_template( $current_foogallery->gallery_template );
            if ( $template_object && is_array( $template_object ) && array_key_exists( $feature_to_check, $template_object ) ) {
                $current_foogallery->supports[$feature_to_check] = $template_object[$feature_to_check];
            } else {
                //this is not stored against the template config, so assume it does not have the feature support
                $current_foogallery->supports[$feature_to_check] = false;
            }
        }
        return $current_foogallery->supports[$feature_to_check] === $value_to_check;
    }
}

/**
 * Checks to see if we have a cached value stored against the current gallery
 * Certain values are cached against the gallery if they have to be done multiple times, for example for each item in the gallery
 *
 * @param $cache_key
 *
 * @return bool
 */
function foogallery_current_gallery_has_cached_value(  $cache_key  ) {
    global $current_foogallery;
    //get out early if there is no current gallery
    if ( !isset( $current_foogallery ) ) {
        return true;
        //this is to ensure we short-circuit having to calculate the cached value later
    }
    return isset( $current_foogallery->cached_values ) && is_array( $current_foogallery->cached_values ) && array_key_exists( $cache_key, $current_foogallery->cached_values );
}

/**
 * Stores a value against the current gallery
 *
 * @param $cache_key
 * @param $cache_value
 */
function foogallery_current_gallery_set_cached_value(  $cache_key, $cache_value  ) {
    global $current_foogallery;
    //get out early if there is no current gallery
    if ( !isset( $current_foogallery ) ) {
        return;
    }
    //check if we need to init the array
    if ( !isset( $current_foogallery->cached_values ) || !is_array( $current_foogallery->cached_values ) ) {
        $current_foogallery->cached_values = array();
    }
    //store the value for later use
    $current_foogallery->cached_values[$cache_key] = $cache_value;
}

/**
 * Set the value of a cached value for the current gallery
 *
 * @param $cache_value
 *
 * @return mixed
 */
function foogallery_current_gallery_get_cached_value(  $cache_value  ) {
    global $current_foogallery;
    //get out early if there is no current gallery
    if ( !isset( $current_foogallery ) ) {
        return false;
    }
    if ( isset( $current_foogallery->cached_values ) && is_array( $current_foogallery->cached_values ) && array_key_exists( $cache_value, $current_foogallery->cached_values ) ) {
        return $current_foogallery->cached_values[$cache_value];
    }
    return false;
}

/**
 * functions related to thumbnail generation within FooGallery
 */
/**
 * Returns the array of available engines
 *
 * @return array
 */
function foogallery_thumb_available_engines() {
    $shortpixel_link = '<a href="https://shortpixel.com/otp/af/foowww" target="_blank">' . __( 'ShortPixel Adaptive Images', 'foogallery' ) . '</a>';
    $engines = array(
        'default'    => array(
            'label'       => __( 'Default', 'foogallery' ),
            'description' => __( 'The default engine used to generate locally cached thumbnails.', 'foogallery' ),
            'class'       => 'FooGallery_Thumb_Engine_Default',
        ),
        'shortpixel' => array(
            'label'       => __( 'ShortPixel', 'foogallery' ),
            'description' => sprintf( __( 'Uses %s to generate all your gallery thumbnails. They will be optimized and offloaded to the ShortPixel global CDN!', 'foogallery' ), $shortpixel_link ),
            'class'       => 'FooGallery_Thumb_Engine_Shortpixel',
        ),
    );
    if ( foogallery_is_debug() ) {
        $engines['dummy'] = array(
            'label'       => __( 'Dummy', 'foogallery' ),
            'description' => __( 'A dummy thumbnail engine that can be used for testing. (uses dummyimage.com)', 'foogallery' ),
            'class'       => 'FooGallery_Thumb_Engine_Dummy',
        );
    }
    return apply_filters( 'foogallery_thumb_available_engines', $engines );
}

/**
 * Returns the active thumb engine, based on settings
 *
 * @return FooGallery_Thumb_Engine
 */
function foogallery_thumb_active_engine() {
    global $foogallery_thumb_engine;
    //if we already have an engine, return it early
    if ( isset( $foogallery_thumb_engine ) && is_a( $foogallery_thumb_engine, 'FooGallery_Thumb_Engine' ) ) {
        return $foogallery_thumb_engine;
    }
    $engine = foogallery_get_setting( 'thumb_engine', 'default' );
    $engines = foogallery_thumb_available_engines();
    if ( array_key_exists( $engine, $engines ) ) {
        $active_engine = $engines[$engine];
        $foogallery_thumb_engine = new $active_engine['class']();
    } else {
        $foogallery_thumb_engine = new FooGallery_Thumb_Engine_Default();
    }
    return $foogallery_thumb_engine;
}

/**
 * Resizes a given image using the active thumb engine.
 *
 * @param       $url
 * @param array $args
 *
 * @return string|void (string) url to the image
 */
function foogallery_thumb(  $url, $args = array()  ) {
    $engine = foogallery_thumb_active_engine();
    return $engine->generate( $url, $args );
}

/**
 * @param $url string
 *
 * @return string
 */
function foogallery_process_image_url(  $url  ) {
    return apply_filters( 'foogallery_process_image_url', $url );
}

/**
 * Build up a link to be used in the admin with the correct utm parameters
 *
 * @param      $url             string The original full URL
 * @param      $utm_campaign    string The campaign or page that the link is on
 * @param null $utm_medium      string The medium, so in this case we want to differentiate btw free and pro
 * @param null $utm_content     string Optional extra data that can be used to differentiate between links in the same campaign
 * @param      $utm_source      string The platform where the traffic originates. Should probably always be wp_plugin
 *
 * @return string
 */
function foogallery_admin_url(
    $url,
    $utm_campaign,
    $utm_content = null,
    $utm_medium = null,
    $utm_source = 'wp_plugin'
) {
    if ( is_null( $utm_source ) ) {
        $utm_source = 'wp_plugin';
    }
    if ( is_null( $utm_medium ) ) {
        if ( foogallery_is_pro() ) {
            $utm_medium = 'foogallery_pro';
        } else {
            $utm_medium = 'foogallery_free';
        }
    }
    $params = array(
        'utm_source'   => $utm_source,
        'utm_medium'   => $utm_medium,
        'utm_campaign' => $utm_campaign,
    );
    if ( !is_null( $utm_content ) ) {
        $params['utm_content'] = $utm_content;
    }
    return add_query_arg( $params, $url );
}

/**
 * Returns true if on the plugin activation page
 *
 * @return bool
 */
function foogallery_is_activation_page() {
    $fs = foogallery_fs();
    return $fs->is_activation_page();
}

/**
 * Render an array of debug info
 *
 * @param array $array an array of data to render.
 */
function foogallery_render_debug_array(  $array, $level = 0  ) {
    foreach ( $array as $key => $value ) {
        if ( !empty( $value ) ) {
            if ( $level > 0 ) {
                echo esc_html( str_repeat( '   ', $level ) );
            }
            echo esc_html( $key ) . ' => ';
            if ( is_array( $value ) ) {
                echo "\r\n";
                foogallery_render_debug_array( $value, $level + 1 );
            } else {
                echo esc_html( $value );
                echo "\r\n";
            }
        }
    }
}

/**
 * Insert a new attachment from a URL.
 *
 * @param array $attachment_data The image attachment data.
 *
 * @return false|int|WP_Error
 */
function foogallery_import_attachment(  $attachment_data  ) {
    // Include image.php so we can call wp_generate_attachment_metadata().
    require_once ABSPATH . 'wp-admin/includes/image.php';
    // Get the contents of the picture.
    $response = wp_remote_get( $attachment_data['url'] );
    if ( is_wp_error( $response ) ) {
        return $response;
    }
    $contents = wp_remote_retrieve_body( $response );
    // Upload and get file data.
    $upload = wp_upload_bits( basename( $attachment_data['url'] ), null, $contents );
    if ( array_key_exists( 'error', $upload ) && false !== $upload['error'] ) {
        return new WP_Error('foogallery_import_attachment_upload_fail', $upload['error']);
    }
    $guid = $upload['url'];
    $file = $upload['file'];
    $file_type = wp_check_filetype( basename( $file ), null );
    // Create attachment.
    $attachment_args = array(
        'ID'             => 0,
        'guid'           => $guid,
        'post_title'     => $attachment_data['title'],
        'post_excerpt'   => $attachment_data['caption'],
        'post_content'   => ( isset( $attachment_data['description'] ) ? $attachment_data['description'] : '' ),
        'post_date'      => '',
        'post_mime_type' => ( isset( $attachment_data['mime_type'] ) ? $attachment_data['mime_type'] : $file_type['type'] ),
    );
    $attachment_args['meta_input'] = array();
    if ( isset( $attachment_data['alt'] ) && !empty( $attachment_data['alt'] ) ) {
        $attachment_args['meta_input']['_wp_attachment_image_alt'] = $attachment_data['alt'];
    }
    if ( isset( $attachment_data['custom_url'] ) && !empty( $attachment_data['custom_url'] ) ) {
        $attachment_args['meta_input']['_foogallery_custom_url'] = $attachment_data['custom_url'];
    }
    if ( isset( $attachment_data['custom_target'] ) && !empty( $attachment_data['custom_target'] ) ) {
        $attachment_args['meta_input']['_foogallery_custom_target'] = $attachment_data['custom_target'];
    }
    // Save the original URL, so that we do not import it again!
    $attachment_args['meta_input']['_foogallery_imported_from'] = $attachment_data['url'];
    // Insert the attachment.
    $attachment_id = wp_insert_attachment(
        $attachment_args,
        $file,
        0,
        true
    );
    if ( is_wp_error( $attachment_id ) ) {
        return $attachment_id;
    }
    $attachment_meta = wp_generate_attachment_metadata( $attachment_id, $file );
    wp_update_attachment_metadata( $attachment_id, $attachment_meta );
    if ( isset( $attachment_data['tags'] ) && is_array( $attachment_data['tags'] ) && count( $attachment_data['tags'] ) > 0 ) {
        if ( taxonomy_exists( FOOGALLERY_ATTACHMENT_TAXONOMY_TAG ) ) {
            // Save tags.
            wp_set_object_terms(
                $attachment_id,
                $attachment_data['tags'],
                FOOGALLERY_ATTACHMENT_TAXONOMY_TAG,
                false
            );
        }
    }
    if ( isset( $attachment_data['categories'] ) && is_array( $attachment_data['categories'] ) && count( $attachment_data['categories'] ) > 0 ) {
        if ( taxonomy_exists( FOOGALLERY_ATTACHMENT_TAXONOMY_CATEGORY ) ) {
            // Save categories.
            wp_set_object_terms(
                $attachment_id,
                $attachment_data['categories'],
                FOOGALLERY_ATTACHMENT_TAXONOMY_CATEGORY,
                false
            );
        }
    }
    return $attachment_id;
}

/**
 * Returns an array of data associated with the attachment, including full size image URL, full size width and height.
 *
 * @param int $attachment_id The attachment ID.
 *
 * @return array|false
 */
function foogallery_get_full_size_image_data(  $attachment_id  ) {
    // Get the URL to the full size image.
    $src = wp_get_attachment_url( $attachment_id );
    // If we cannot get an attachment URL, then get out early.
    if ( false === $src ) {
        return false;
    }
    // First try to get the image metadata.
    $image_data = wp_get_attachment_metadata( $attachment_id );
    $width = $height = 0;
    if ( is_array( $image_data ) ) {
        if ( array_key_exists( 'width', $image_data ) ) {
            $width = $image_data['width'];
        }
        if ( array_key_exists( 'height', $image_data ) ) {
            $height = $image_data['height'];
        }
    } else {
        $image_data = wp_get_attachment_image_src( $attachment_id, 'full' );
        $width = $image_data[1];
        $height = $image_data[2];
    }
    // Do a last check for the height and width.
    if ( $width === $height && 0 === $height ) {
        // If nothing is stored in meta, then get the size from the physical file. Not ideal, but might be needed in some cases.
        list( $width, $height ) = wp_getimagesize( $src );
    }
    return array($src, $width, $height);
}

/**
 * Generate an SVG image placeholder
 *
 * @param $w
 * @param $h
 *
 * @return string
 */
function foogallery_get_svg_placeholder_image(  $w, $h  ) {
    return 'data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22' . $w . '%22%20height%3D%22' . $h . '%22%20viewBox%3D%220%200%20' . $w . '%20' . $h . '%22%3E%3C%2Fsvg%3E';
}

/**
 * Extracts the gallery ID from a full gallery ID
 *
 * @param $full_gallery_id
 *
 * @return int
 */
function foogallery_extract_gallery_id(  $full_gallery_id  ) {
    preg_match_all( '/^.*?(\\d+?)(?:_|$)/', $full_gallery_id, $matches );
    if ( is_array( $matches ) ) {
        return intval( $matches[1][0] );
    }
    return 0;
}

/**
 * Return the index of a specific section with the gallery template fields array
 *
 * @param $fields
 * @param $section
 *
 * @return int
 */
function foogallery_admin_fields_find_index_of_section(  $fields, $section  ) {
    $index = 0;
    foreach ( $fields as $field ) {
        if ( isset( $field['section'] ) && $section === $field['section'] ) {
            return $index;
        }
        $index++;
    }
    return $index;
}

/**
 * Return the index of a specific field within the gallery template fields array
 *
 * @param $fields
 * @param $field_id
 *
 * @return int
 */
function foogallery_admin_fields_find_index_of_field(  $fields, $field_id  ) {
    $index = 0;
    foreach ( $fields as $field ) {
        if ( isset( $field['id'] ) && $field_id === $field['id'] ) {
            return $index;
        }
        $index++;
    }
    return $index;
}

/**
 * Returns true if the field exists in the array
 *
 * @param $fields
 * @param $field_id
 * @return bool
 */
function foogallery_admin_fields_has_field(  $fields, $field_id  ) {
    foreach ( $fields as $field ) {
        if ( isset( $field['id'] ) && $field_id === $field['id'] ) {
            return true;
        }
    }
    return false;
}

/**
 * Returns the path of the URL
 *
 * @param $url
 *
 * @return false|string
 */
function foogallery_local_url_to_path(  $url  ) {
    return FooGallery_Thumb_Generator::get_file_path( $url );
}

/**
 * Sanitizes a code field for saving to the database.
 *
 * @param string $text
 *
 * @return false|string
 */
function foogallery_sanitize_code(  $text  ) {
    if ( !empty( $text ) ) {
        $text = wp_check_invalid_utf8( $text, true );
        $text = htmlentities( $text );
        return apply_filters( 'foogallery_sanitize_code', $text );
    }
    return false;
}

/**
 * Prepares a code field for use after it has been sanitized.
 *
 * @param string $text
 *
 * @return false|string
 */
function foogallery_prepare_code(  $text  ) {
    if ( !empty( $text ) ) {
        $text = html_entity_decode( $text );
        return apply_filters( 'foogallery_prepare_code', $text );
    }
    return false;
}

/**
 * Returns true if the feature is enabled.
 *
 * @param $feature
 * @return bool
 */
function foogallery_feature_enabled(  $feature  ) {
    global $foogallery_features;
    if ( empty( $foogallery_features ) ) {
        $api = new FooGallery_Extensions_API();
        $foogallery_features = $api->get_all_for_view();
    }
    return array_key_exists( $feature, $foogallery_features ) && $foogallery_features[$feature]['is_active'];
}

/**
 * Returns an array of the pro features available in FooGallery.
 *
 * @return array
 */
function foogallery_pro_features() {
    global $foogallery_pro_features;
    if ( !isset( $foogallery_pro_features ) ) {
        $foogallery_pro_features = (include FOOGALLERY_PATH . 'includes/admin/pro-features.php');
    }
    return $foogallery_pro_features;
}

/**
 * Retrieves the target options for FooGallery attachments.
 *
 * The function retrieves an array of target options that can be used for customizing
 * the behavior of attachment links within the FooGallery plugin.
 *
 * @return array An associative array of target options with keys like '_blank', '_self', etc.
 *
 * @since 1.0.0
 */
function foogallery_get_target_options() {
    /**
     * Filter the target options for FooGallery attachments.
     *
     * @param array $target_options An associative array of target options.
     */
    $target_options = apply_filters( 'foogallery_attachment_field_custom_target_options', array(
        'default' => __( 'Default', 'foogallery' ),
        '_blank'  => __( 'New tab (_blank)', 'foogallery' ),
        '_self'   => __( 'Same tab (_self)', 'foogallery' ),
        'foobox'  => __( 'FooBox', 'foogallery' ),
    ) );
    return $target_options;
}

/**
 * If the user can, then create some FooGallery demo content!
 *
 * @return false|int[]
 */
function foogallery_create_demo_content() {
    if ( is_admin() && is_user_logged_in() && current_user_can( 'manage_options' ) ) {
        $importer = new FooGallery_Admin_Demo_Content();
        $results = $importer->import_demo_content();
        foogallery_set_setting( 'demo_content', 'on' );
        return $results;
    }
    return false;
}

/**
 * Returns if Freemius is in anonymous mode.
 *
 * @return false
 */
function foogallery_freemius_is_anonymous() {
    if ( defined( 'FOOPLUGINS_FREEMIUS_ANONYMOUS' ) ) {
        return FOOPLUGINS_FREEMIUS_ANONYMOUS;
    }
    return false;
}