<?php

namespace App\Blog\Search;

use App\Blog;

class Obj extends Blog\Obj
{
    const TYPE_CATEGORY = 'category';
    const TYPE_POST = 'post';

    /** @var array */
    protected $_filterFields = array('title', 'excerpt', 'rawContent');

    /** @var array */
    protected $_categoryFilterFields = array('title');

    /** @var string */
    protected $_sitemapUrl;

    /** @var string */
    protected $_tableAliasCategory = 'PostCategory';

    /**
     * @return \Zend_Db_Select
     */
    public function getListSelect()
    {
        if (null === $this->_select) {
            $this->_select = $this->_db->select();
            $this->_select->union(array(
                $this->_getCategoryList4Select(),
                $this->_getPostList4Select()
            ));

            $this->_applySelectOptions($this->_select, $this->_selectOptions);
        }

        return $this->_select;
    }

    /**
     * @param \Zend_Db_Select $select
     * @param string $tableAlias
     * @param array $filterFields
     * @return Obj
     */
    protected function _unionFilter(\Zend_Db_Select $select, $tableAlias, array $filterFields)
    {
        if (!$this->hasFilter()) {
            return $this;
        }

        if (!empty($filterFields) && array_key_exists('query', $this->_filter)) {
            \Qs_Db_Filter::where($select, array($tableAlias => $filterFields), $this->_filter['query']);
        }

        $filter = $this->_getCleanedFilter($this->_filter);
        \Qs_Db::filter($select, $filter, $this->_tableShortAlias ?: $this->_tableAlias);

        return $this;
    }

    /**
     * @return \Zend_Db_Select
     */
    protected function _getCategoryList4Select()
    {
        $select = $this->_db->select();

        $columns = array(
            'type'       => new \Zend_Db_Expr('"' . static::TYPE_CATEGORY . '"'),
            'categoryId' => 'id',
            'id',
            'alias',
            'title',
            'excerpt'    => new \Zend_Db_Expr('""'),
            'rawContent' => new \Zend_Db_Expr('""')
        );
        $select->from($this->_getPair($this->_tableAliasCategory), $columns);

        $select->where('`' . $this->_tableAliasCategory . '`.`enabled` = "y"');
        $select->where('EXISTS (' . $this->_getHasPostSelect() . ')');

        $this->_unionFilter($select, $this->_tableAliasCategory, $this->_categoryFilterFields);

        return $select;
    }

    /**
     * @return \Zend_Db_Select;
     */
    protected function _getHasPostSelect()
    {
        $select = $this->_db->select();
        $select->from($this->_getPair($this->_tableAlias), new \Zend_Db_Expr('1'));
        $select->where('`' . $this->_tableAlias . '`.`categoryId` = `' . $this->_tableAliasCategory . '`.`id`');
        $select->where('`' . $this->_tableAlias . '`.`enabled` = "y"');
        $select->limit(1);
        return $select;
    }

    /**
     * @return \Zend_Db_Select
     */
    protected function  _getPostList4Select()
    {
        $select = $this->_db->select();

        $columns = array(
            'type'       => new \Zend_Db_Expr('"' . static::TYPE_POST . '"'),
            'categoryId',
            'id',
            'alias',
            'title',
            'excerpt',
            'rawContent'
        );
        $select->from($this->_getPair($this->_tableAlias), $columns);

        $select->join(
            $this->_getPair($this->_tableAliasCategory),
            '`' . $this->_tableAlias . '`.`categoryId` = `' . $this->_tableAliasCategory . '`.`id`',
            array()
        );

        $select->where('`' . $this->_tableAlias . '`.`enabled` = "y"');
        $select->where('`' . $this->_tableAliasCategory . '`.`enabled` = "y"');

        $this->_unionFilter($select, $this->_tableAlias, $this->_filterFields);

        return $select;
    }

    /**
     * @return string
     * @throws \Qs_Exception
     */
    protected function _getSitemapUlr()
    {
        if (null === $this->_sitemapUrl) {
            $this->_sitemapUrl = \Qs_SiteMap::findFirst(null, array('type' => 'Blog\\'), null, 'url');
            if (!$this->_sitemapUrl) {
                throw new \Qs_Exception('Can not determine Blog URL');
            }
        }
        return $this->_sitemapUrl;
    }

    /**
     * @param array $list items list
     * @param array $providerOptions provider options from site/App/Search/config.php
     * @return Obj
     */
    protected function _prepareSearchList(array &$list, array $providerOptions)
    {
        $this->_prepareList($list);

        if (!empty($list)) {
            foreach ($list as &$row) {
                $row['title'] = \Qs_Text_Mark::markSearchWords($row['title'], $this->getFilter('query'));
                if (static::TYPE_POST == $row['type']) {
                    $content = $row['excerpt'] . ' ' . $row['rawContent'];
                    $content = trim($content);
                    $row['content'] = \Qs_Text_Mark::markSearchWords($content, $this->getFilter('query'));

                    $row['searchUrl'] = $this->_getSitemapUlr() . '/' . $row['alias'];
                } else { /* TYPE_CATEGORY */
                    $row['searchUrl'] = $this->_getSitemapUlr() . '/category/' . $row['alias'];
                }
            }
        }

        return $this;
    }
}