<?php

namespace UkrSolution\WpLabelsPrinting4\LabelDataMakers\Shortcodes\Woocommerce;

class WcCategory extends ProductsShortcode
{
    const ORDER = 1500;
    public $display_name = 'Categories';
    const DOC_SECTION_NAME = 'Categories:';
    const DOC_LINES = array(
        'Category chain:' => '[wc-category]',
        'Top category:' => '[wc-category level="top"]',
        'Last category:' => '[wc-category level="last" separator=", "]',
    );

    public function getValue($post, $field)
    {
        $terms = 'product_variation' === $post->post_type
            ? get_the_terms($post->post_parent, 'product_cat')
            : get_the_terms($post, 'product_cat');

        $termsHierarchy = array();

        while (!empty($terms)) {
            foreach ($terms as &$term) {
                if ($this->termHaveParent($terms, $term)) {
                    continue;
                } else {
                    $this->sortTermsHierarchically($terms, $termsHierarchy, $term->parent);
                }
            }
        }

        $args = isset($field['args']) ? $field['args'] : array();

        return $this->categoryObjectsToString($termsHierarchy, null, $args);
    }

    protected function termHaveParent($terms, $term)
    {
        foreach ($terms as $theTerm) {
            if ($term->parent === $theTerm->term_id) {
                return true;
            }
        }

        return false;
    }

    protected function sortTermsHierarchically(&$cats, &$into, $parentId = 0)
    {
        foreach ($cats as $i => $cat) {
            if ($cat->parent == $parentId) {
                $into[$cat->term_id] = $cat;
                unset($cats[$i]);
            }
        }

        foreach ($into as $topCat) {
            $topCat->childrens = array();
            $this->sortTermsHierarchically($cats, $topCat->childrens, $topCat->term_id);
        }
    }

    protected function categoryObjectsToString($terms, $termMeta = null, $args = array())
    {
        if ($terms && !is_wp_error($terms)) {

            $categoryChains = array();
            foreach ($terms as $term) {
                $levels = $this->getLevels(array($term));
                if (!empty($levels)) {
                    if (isset($args['level']) && 'top' === $args['level']) {
                        $categoryChains[] = reset($levels);
                    } elseif (isset($args['level']) && 'last' === $args['level']) {
                        $categoryChains[] = end($levels);
                    } else {
                        $categoryChains[] = implode(isset($args['separator']) ? $args['separator'] : "&#10141;", $levels);
                    }
                }
            }

            if (!empty($categoryChains)) {
                return implode('; ', $categoryChains);
            } else {
                return null;
            }
        }

        return null;
    }

    protected function getLevels($parents, $result = array())
    {
        $levelItems = array();
        $nextLevelParents = array();

        foreach ($parents as $currentLevelParent) {
            $levelItems[] = $currentLevelParent->name;

            if (!empty($currentLevelParent->childrens)) {
                $nextLevelParents += $currentLevelParent->childrens;
            }
        }

        $result[] = implode(', ', $levelItems);

        return !empty($nextLevelParents) ? $this->getLevels($nextLevelParents, $result) : $result;
    }
}