class QuickSet

class QuickSet {
    
    /**
     * The unique name of the QuickSet object.
     * This corresponds to the machine name as stored in the database or as defined
     * in code.
     * @var string
     */
    protected $name;
    
    /**
     * The contents array.
     * An array of objects that implement the QuickContentRenderable interface.
     * @var array
     */
    protected $contents;
    
    /**
     * An array of settings controlling the behaviour of the QuickSet object. See
     * the getDefaultSettings() static function of this class for the full list of
     * settings.
     * @var array
     */
    protected $settings;
    
    /**
     * Accessors.
     */
    public function getName() {
        return $this->name;
    }
    public function getContents() {
        return $this->contents;
    }
    public function getSettings() {
        return $this->settings;
    }
    public function getTitle() {
        return isset($this->settings['title']) ? $this->translateString($this->settings['title'], 'title') : $this->name;
    }
    
    /**
     * Instantiate, populate and return a QuickSet object wrapped in a renderer.
     *
     * @param $name
     *   The unique name (machine name) of the QuickSet instance.
     *
     * @param $contents
     *   The array of content items, each one itself an array with at least a 'type'
     *   key, a 'title' key, and the other info necessary for that type.
     *
     * @param $renderer
     *   The plugin key for this renderer plugin
     *
     * @param $settings
     *   An array of settings determining the behaviour of this QuickSet instance.
     *  
     */
    public static function QuickSetRendererFactory($name, $contents, $renderer, $settings) {
        ctools_include('plugins');
        if ($class = ctools_plugin_load_class('quicktabs', 'renderers', $renderer, 'handler')) {
            try {
                $qs = new self($name, $contents, $settings);
            } catch (InvalidQuickSetException $e) {
                watchdog('Quicktabs', $e->getMessage());
                return NULL;
            }
            return new $class($qs);
        }
    }
    
    /**
     * Returns a reference to an object that implements the QuickContentRenderable
     * interface.
     */
    public static function getContentRenderer($tab) {
        if ($tab['type'] == 'prerendered') {
            return new QuickPreRenderedContent($tab);
        }
        if ($content = QuickContent::factory($tab['type'], $tab)) {
            return $content;
        }
        return NULL;
    }
    
    /**
     * Static method to retrieve content from an ajax call. This is called by the
     * quicktabs_ajax() callback in quicktabs.module.
     */
    public static function ajaxRenderContent($type, $args) {
        if ($renderer = self::getContentRenderer(array(
            'type' => $type,
        ))) {
            $output = $renderer->render(FALSE, $args);
            return !empty($output) ? drupal_render($output) : '';
        }
        return '';
    }
    
    /**
     * Ensure sensible default settings for each QuickSet object.
     */
    private static function getDefaultSettings() {
        return array(
            'title' => '<none>',
            'style' => 'nostyle',
            'hide_empty_tabs' => 0,
            'ajax' => 0,
            'default_tab' => 0,
            'options' => array(),
        );
    }
    
    /**
     * Constructor
     */
    public function __construct($name, $contents, $settings) {
        $this->name = $name;
        $this->contents = array();
        foreach ($contents as $key => $item) {
            // Instantiate a content renderer object and add it to the contents array.
            if ($renderer = self::getContentRenderer($item)) {
                $this->contents[$key] = $renderer;
            }
        }
        $default_settings = self::getDefaultSettings();
        $this->settings = array_merge($default_settings, $settings);
        $this->prepareContents();
        // Set the default style if necessary.
        if ($this->settings['style'] == 'default') {
            $this->settings['style'] = variable_get('quicktabs_tabstyle', 'nostyle');
        }
    }
    
    /**
     * Returns an ajax path to be used on ajax-enabled tab links.
     *
     * @param $index The index of the tab, i.e where it fits into the QuickSet
     * instance.
     *
     * @param $type The type of content we are providing an ajax path for.
     */
    public function getAjaxPath($index, $type) {
        return 'quicktabs/ajax/' . $this->name . '/' . $index . '/' . $type;
    }
    
    /**
     * Translates Quicktabs user-defined strings if the i18n module is
     * enabled.
     */
    public function translateString($string, $type = 'tab', $index = 0) {
        switch ($type) {
            case 'tab':
                $name = "tab:{$this->name}:title:" . md5($string);
                break;
            case 'title':
                $name = "title:{$this->name}";
                break;
        }
        return quicktabs_translate($name, $string);
    }
    
    /**
     * This method does some initial set-up of the tab contents, such as hiding
     * tabs with no content if the hide_empty_tabs option is set. It also makes sure
     * that prerendered contents are never attempted to be loaded via ajax.
     *
     * @throws InvalidQuickSetException if there are no contents to render.
     */
    protected function prepareContents() {
        if (!count($this->contents)) {
            throw new InvalidQuickSetException('There are no contents to render.');
        }
        if ($this->settings['hide_empty_tabs'] && !$this->settings['ajax']) {
            // Check if any tabs need to be hidden because of empty content.
            $renderable_contents = 0;
            foreach ($this->contents as $key => $tab) {
                $contents = $tab->render(TRUE);
                reset($contents);
                if (!empty($contents)) {
                    // If it's block type quicktab, #markup will be on level lower.
                    if (!isset($contents['#markup'])) {
                        $contents = reset($contents);
                    }
                    $string = strip_tags($contents['#markup']);
                    // If string contains only whitespaces it will be removed.
                    $string = trim($string);
                }
                else {
                    $string = $contents;
                }
                if (!$string) {
                    // Rather than removing the item, we set it to NULL. This way we retain
                    // the same indices across tabs, so that permanent links to particular
                    // tabs can be relied upon.
                    $this->contents[$key] = NULL;
                    // The default tab must not be a hidden tab.
                    if ($this->settings['default_tab'] == $key) {
                        $this->settings['default_tab'] = ($key + 1) % count($this->contents);
                    }
                }
                else {
                    $renderable_contents++;
                }
            }
            if (!$renderable_contents) {
                throw new InvalidQuickSetException('There are no contents to render.');
            }
        }
        elseif ($this->settings['ajax']) {
            // Make sure that there is at most 1 prerendered tab and it is the default tab.
            // Prerendered content cannot be rendered via ajax.
            $has_prerendered = FALSE;
            // keep track of whether we have found a prerendered tab.
            foreach ($this->contents as $key => $tab) {
                $type = $tab->getType();
                if ($type == 'prerendered') {
                    if (!$has_prerendered) {
                        $has_prerendered = TRUE;
                        $this->settings['default_tab'] = $key;
                        // In the case of a direct link to a different tab, the 'default_tab'
                        // will be overridden, so we need to make sure it does not attempt
                        // to load a pre-rendered tab via ajax. Turn ajax option off.
                        if ($this->getActiveTab() !== $key) {
                            $this->settings['ajax'] = 0;
                        }
                    }
                    else {
                        // We are on a second custom tab and the ajax option is set, we cannot
                        // render custom tabs via ajax, so we skip out of the loop, set the
                        // ajax option to off, and call the method again.
                        $this->settings['ajax'] = 0;
                        $this->prepareContents();
                        return;
                    }
                }
            }
        }
    }
    
    /**
     * Returns the active tab for a given Quicktabs instance. This could be coming
     * from the URL or just from the settings for this instance. If neither, it
     * defaults to 0.
     */
    public function getActiveTab() {
        $active_tab = isset($this->settings['default_tab']) ? $this->settings['default_tab'] : key($this->contents);
        $active_tab = isset($_GET['qt-' . $this->name]) ? $_GET['qt-' . $this->name] : $active_tab;
        $active_tab = isset($active_tab) && isset($this->contents[$active_tab]) ? $active_tab : QUICKTABS_DELTA_NONE;
        return $active_tab;
    }

}