<?php

/**
 * Scripts enqueue class.
 *
 * @since 3.1.1
 */
class Scripts extends Dependencies {

    private static $instance;
    public $async        = array();

    public static function newInstance()
    {
        if(!self::$instance instanceof self) {
            self::$instance = new self;
        }
        return self::$instance;
    }

    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Add script to be loaded
     *
     * @param type $id
     * @param type $url
     * @param type $dependencies mixed, it could be an array or a string
     * @param boolean $force, force load script (available since osclass evo v. 4.4.0)
     */
    public function registerScript($id, $url, $dependencies = null, $force = false)
    {
        $this->register($id, $url, $dependencies, $force);
    }

    /**
     * Remove script to not be loaded
     *
     * @param type $id
     */
    public function unregisterScript($id)
    {
        $this->unregister($id);
    }

    /**
     * Enqueu script to be loaded
     *
     * @param type $id
     */
    public function enqueuScript($id)
    {
        $this->queue[$id] = $id;
    }

    /**
     * Remove script to not be loaded
     *
     * @param type $id
     */
    public function removeScript($id)
    {
        unset($this->queue[$id]);
    }

    /**
     *  Get the scripts urls
     */
    public function getScripts()
    {
        parent::order();
        $scripts = array();

        foreach($this->resolved as $i => $id) {
            if( isset($this->registered[$id]['url']) ) {
                $scripts[$i] = $this->registered[$id]['url'];
                $scripts['async'][$i] = $this->registered[$id]['async'];
            }
        }

        return $scripts;
    }

    /**
     *  Print the HTML tags to load the necessary script
     */
    public function printScript($id)
    {
        if(isset($this->registered[$id]['url'])) {
            $async = $this->registered[$id]['async'] ? 'defer' : '';

            echo '<script type="text/javascript" src="' . osc_apply_filter('theme_url', $this->registered[$id]['url']) . '" ' . $async . '></script>' . PHP_EOL;
        }
    }

    /**
     *  Print the HTML tags to load the scripts
     */
    public function printScripts()
    {
        $scripts = $this->getScripts();

        foreach($scripts as $i => $script) {
            $async = (isset($this->getScripts()['async'][$i]) && $this->getScripts()['async'][$i] == true && !OC_ADMIN) ? 'defer' : '';

            if($script && $i != 'async') {
                echo '<script type="text/javascript" src="' . osc_apply_filter('theme_url', $script) . '" ' . $async . '></script>' . PHP_EOL;
            }
        }
    }
}