class MenuLink

class MenuLink extends DrupalSqlBase {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = $this->select('menu_links', 'ml')
            ->fields('ml')
            ->condition('ml.menu_name', 'shortcut-set-%', 'NOT LIKE');
        $and = $query->andConditionGroup()
            ->condition('ml.module', 'menu')
            ->condition('ml.router_path', [
            'admin/build/menu-customize/%',
            'admin/structure/menu/manage/%',
        ], 'NOT IN');
        $condition = $query->orConditionGroup()
            ->condition('ml.customized', 1)
            ->condition($and);
        $query->condition($condition);
        if (isset($this->configuration['menu_name'])) {
            $query->condition('ml.menu_name', (array) $this->configuration['menu_name'], 'IN');
        }
        $query->leftJoin('menu_links', 'pl', '[ml].[plid] = [pl].[mlid]');
        $query->addField('pl', 'link_path', 'parent_link_path');
        $query->orderBy('ml.depth');
        $query->orderby('ml.mlid');
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        $fields = [
            'menu_name' => $this->t("The menu name. All links with the same menu name (such as 'navigation') are part of the same menu."),
            'mlid' => $this->t('The menu link ID (mlid) is the integer primary key.'),
            'plid' => $this->t('The parent link ID (plid) is the mlid of the link above in the hierarchy, or zero if the link is at the top level in its menu.'),
            'link_path' => $this->t('The Drupal path or external path this link points to.'),
            'router_path' => $this->t('For links corresponding to a Drupal path (external = 0), this connects the link to a {menu_router}.path for joins.'),
            'link_title' => $this->t('The text displayed for the link, which may be modified by a title callback stored in {menu_router}.'),
            'options' => $this->t('A serialized array of options to set on the URL, such as a query string or HTML attributes.'),
            'module' => $this->t('The name of the module that generated this link.'),
            'hidden' => $this->t('A flag for whether the link should be rendered in menus. (1 = a disabled menu link that may be shown on admin screens, -1 = a menu callback, 0 = a normal, visible link)'),
            'external' => $this->t('A flag to indicate if the link points to a full URL starting with a protocol, like http:// (1 = external, 0 = internal).'),
            'has_children' => $this->t('Flag indicating whether any links have this link as a parent (1 = children exist, 0 = no children).'),
            'expanded' => $this->t('Flag for whether this link should be rendered as expanded in menus - expanded links always have their child links displayed, instead of only when the link is in the active trail (1 = expanded, 0 = not expanded)'),
            'weight' => $this->t('Link weight among links in the same menu at the same depth.'),
            'depth' => $this->t('The depth relative to the top level. A link with plid == 0 will have depth == 1.'),
            'customized' => $this->t('A flag to indicate that the user has manually created or edited the link (1 = customized, 0 = not customized).'),
            'p1' => $this->t('The first mlid in the materialized path. If N = depth, then pN must equal the mlid. If depth > 1 then p(N-1) must equal the plid. All pX where X > depth must equal zero. The columns p1 .. p9 are also called the parents.'),
            'p2' => $this->t('The second mlid in the materialized path. See p1.'),
            'p3' => $this->t('The third mlid in the materialized path. See p1.'),
            'p4' => $this->t('The fourth mlid in the materialized path. See p1.'),
            'p5' => $this->t('The fifth mlid in the materialized path. See p1.'),
            'p6' => $this->t('The sixth mlid in the materialized path. See p1.'),
            'p7' => $this->t('The seventh mlid in the materialized path. See p1.'),
            'p8' => $this->t('The eighth mlid in the materialized path. See p1.'),
            'p9' => $this->t('The ninth mlid in the materialized path. See p1.'),
            'updated' => $this->t('Flag that indicates that this link was generated during the update from Drupal 5.'),
        ];
        // The database connection may not exist, for example, when building
        // the Migrate Message form.
        if ($source_database = $this->database) {
            $schema = $source_database->schema();
            if ($schema->fieldExists('menu_links', 'language')) {
                $fields['language'] = $this->t("Menu link language code.");
            }
            if ($schema->fieldExists('menu_links', 'i18n_tsid')) {
                $fields['i18n_tsid'] = $this->t("Translation set id.");
            }
        }
        return $fields;
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        // In Drupal 7 a language neutral menu_link can be translated. The menu
        // link is treated as if it is in the site default language. So, here
        // we look to see if this menu link has a translation and if so, the
        // language is changed to the default language. With the language set
        // the entity API will allow the saving of the translations.
        if ($row->hasSourceProperty('language') && $row->getSourceProperty('language') == 'und' && $this->hasTranslation($row->getSourceProperty('mlid'))) {
            $default_language = $this->variableGet('language_default', (object) [
                'language' => 'und',
            ]);
            $default_language = $default_language->language;
            $row->setSourceProperty('language', $default_language);
        }
        // If this menu link is part of translation set skip the translations. The
        // translations are migrated in d7_menu_link_localized.yml.
        $row->setSourceProperty('skip_translation', TRUE);
        if ($row->hasSourceProperty('i18n_tsid') && $row->getSourceProperty('i18n_tsid') != 0) {
            $source_mlid = $this->select('menu_links', 'ml')
                ->fields('ml', [
                'mlid',
            ])
                ->condition('i18n_tsid', $row->getSourceProperty('i18n_tsid'))
                ->orderBy('mlid')
                ->range(0, 1)
                ->execute()
                ->fetchField();
            if ($source_mlid !== $row->getSourceProperty('mlid')) {
                $row->setSourceProperty('skip_translation', FALSE);
            }
        }
        // In Drupal 6 the language for the menu is in the options array. Set
        // property 'is_localized' so that the process pipeline can determine if
        // the menu link is localize or not.
        $row->setSourceProperty('is_localized', NULL);
        $default_language = $this->variableGet('language_default', (object) [
            'language' => 'und',
        ]);
        $default_language = $default_language->language;
        $options = unserialize($row->getSourceProperty('options'));
        if (isset($options['langcode'])) {
            if ($options['langcode'] != $default_language) {
                $row->setSourceProperty('language', $options['langcode']);
                $row->setSourceProperty('is_localized', 'localized');
            }
        }
        $row->setSourceProperty('options', unserialize($row->getSourceProperty('options')));
        $row->setSourceProperty('enabled', !$row->getSourceProperty('hidden'));
        $description = $row->getSourceProperty('options/attributes/title');
        if ($description !== NULL) {
            $row->setSourceProperty('description', Unicode::truncate($description, 255));
        }
        return parent::prepareRow($row);
    }
    
    /**
     * Determines if this  menu_link has an i18n translation.
     *
     * @param string $mlid
     *   The menu id.
     *
     * @return bool
     *   True if the menu_link has an i18n translation.
     */
    public function hasTranslation($mlid) {
        if ($this->getDatabase()
            ->schema()
            ->tableExists('i18n_string')) {
            $results = $this->select('i18n_string', 'i18n')
                ->fields('i18n')
                ->condition('textgroup', 'menu')
                ->condition('type', 'item')
                ->condition('objectid', $mlid)
                ->execute()
                ->fetchAll();
            if ($results) {
                return TRUE;
            }
        }
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['mlid']['type'] = 'integer';
        $ids['mlid']['alias'] = 'ml';
        return $ids;
    }

}