<?php

    class Banner {

        // Set variables
        public $directory;
        protected $defaultPage = "index";

        public function checkDirectory($page) {
            // Set directory & check it exists
            $this->directory = 'assets/img/transitions/'.$page.'/';
            if(!is_dir($this->directory)) {
                // If it doesn't, set default directory
                $this->directory = 'assets/img/transitions/'.$this->defaultPage.'/';
            } return true;

        }

        public function pullImages($page) {
            // Open the directory
            if($handle = opendir($this->directory)) {
                $images = array();

                while(false !== ($entry = readdir($handle))) {
                    if($entry != "." && $entry != "..") {

                        // Insert image into array
                        $images[] = '/'.$this->directory.$entry;
                    }
                }

                // Close directory
                closedir($handle);

                // Sort images & return array
                sort($images);
                return $images;
            }
        }

        public function display($page) {
            // Check that page variable is being sent through
            if(isset($page)) {

                // Check the directory exists
                if($this->checkDirectory($page)) {

                    // Pull images from folder
                    $images = $this->pullImages($page);

                    // Set Counter & HTML Return
                    $counter = 0;
                    $html = "";

                    // Loop throuh images
                    foreach($images as $image) {
                        $counter++;

                        // Add them into HTML Return
                        $html .= '<img src="'.$image.'" class="banner__slide slide--'.$counter.'" />';
                    }

                    if(!empty($html)) {
                        return $html;
                    }
                }
            }
        }

    }

    // Initialize Banner
    $banner = new Banner;

?>

<div class="inner-slider">
    <?= $banner->display($page); ?>
</div>