<?php
/**
 * @property \modelBackendContent $model_backend_content
 */
class actionAdminContentCatsOrder extends cmsAction {

    private $total_nodes = 0;

    public function run($ctype_id) {

        $ctype = $this->model_backend_content->getContentType($ctype_id);
        if (!$ctype) {
            return cmsCore::error404();
        }

        $categories = $this->model_backend_content->getCategoriesTree($ctype['name'], false);

        $this->model_backend_content->localizedRestore();

        if ($this->request->has('submit')) {

            $csrf_token = $this->request->get('csrf_token', '');
            if (!cmsForm::validateCSRFToken($csrf_token)) {

                cmsUser::addSessionMessage(LANG_FORM_ERRORS, 'error');

                return $this->redirectToAction('content');
            }

            $hash = $this->request->get('hash', '');

            cmsUser::setCookiePublic('content_tree_path', "{$ctype_id}.1");

            if (!$this->reorderCategoriesTree($ctype, $categories, $hash)) {

                cmsUser::addSessionMessage(LANG_FORM_ERRORS, 'error');

            } else {
                cmsUser::addSessionMessage(LANG_CP_ORDER_SUCCESS, 'success');
            }

            return $this->redirectToAction('content');
        }

        return $this->cms_template->render('content_cats_order', [
            'ctype'      => $ctype,
            'categories' => $categories
        ]);
    }

    private function reorderCategoriesTree($ctype, $categories, $hash) {

        $hash = json_decode($hash, true);

        if (!$hash) {
            return false;
        }

        $this->total_nodes = 0;

        $tree = $this->prepareTree($hash);

        $tree = $this->buildNestedSet($tree);

        return $this->model_backend_content->updateCategoryTree(
            $ctype['name'],
            $tree,
            $this->total_nodes,
            !empty($ctype['options']['is_cats_first_level_slug'])
        );
    }

    private function countChilds($tree, $count) {

        foreach ($tree as $idx => $node) {

            if (!empty($node['children'])) {
                $my_count = count($node['children']);
                $count    = $my_count + $this->countChilds($node['children'], $count);
            }
        }

        return $count;
    }

    private function prepareTree($tree, $parent_key = 1) {

        foreach ($tree as $idx => $node) {

            unset($node['expand']);
            unset($node['activate']);
            unset($node['isFolder']);

            $node['parent_key'] = $parent_key;

            if (!empty($node['children']) && is_array($node['children'])) {
                $count                  = count($node['children']);
                $node['children']       = $this->prepareTree($node['children'], $node['key']);
                $node['children_count'] = $this->countChilds($node['children'], $count);
            } else {
                $node['children_count'] = 0;
            }

            $tree[$idx] = $node;
            $this->total_nodes++;
        }

        return $tree;
    }

    private function buildNestedSet($tree, $left = 1, $level = 1) {

        foreach ($tree as $idx => $node) {

            $left++;

            $node['left']  = $left;
            $node['level'] = $level;

            if (!empty($node['children'])) {

                $node['right'] = $left + ($node['children_count'] * 2) + 1;

                $child_level = $level + 1;

                $node['children'] = $this->buildNestedSet($node['children'], $left, $child_level);
            } else {

                $node['right'] = $node['left'] + 1;
            }

            $left = $node['right'];

            $tree[$idx] = $node;
        }

        return $tree;
    }

}