<?php

namespace bff\db\illuminate;

use bff;

/**
 * Langs Base Trait
 *
 * @method QueryBuilder lang($language = null)
 * @copyright Tamaranga
 */
trait LangsBase
{
    protected $langCurrent;

    protected $langAttributes = [];

    /**
     * Language columns list
     * For example: return ['title', 'description'];
     *
     * @return array
     */
    abstract public function langColumns();

    /**
     * Checks if column is translatable
     *
     * @param string $column
     * @return bool
     */
    public function isLangColumn($column)
    {
        if (stripos($column, ' as ') !== false) {
            $segments = preg_split('/\s+as\s+/i', $column);
            $column = $segments[0];
        }
        if (strpos($column, '.') !== false) {
            $column = preg_split('/\.| /', $column);
            $column = end($column);
        }
        return in_array($column, $this->langColumns(), true);
    }

    /**
     * Separate lang attributes
     * @param bool $separate separate or merge
     */
    public function moveLangAttributes($separate = true)
    {
        if ($separate) {
            $this->langAttributes = [];
            foreach ($this->langColumns() as $key) {
                if (isset($this->attributes[$key])) {
                    $this->langAttributes[$key] = $this->attributes[$key];
                    unset($this->attributes[$key]);
                }
            }
        } else {
            foreach ($this->langAttributes as $key => $value) {
                $this->attributes[$key] = $value;
            }
            $this->langAttributes = [];
        }
    }

    /**
     * Get application languages list
     *
     * @return array
     */
    public function langsList()
    {
        return bff::locale()->getLanguages();
    }

    /**
     * Set default language (scope)
     *
     * @param QueryBuilder $query
     * @param string|null $lang language key or null - current language
     * @return QueryBuilder
     */
    public function scopeLang($query, $lang = null)
    {
        $this->langDefault($lang);

        return $query;
    }

    /**
     * Set default language
     *
     * @param string|null $lang
     * @param bool $reset reset to default
     * @return string
     */
    public function langDefault($lang = null, $reset = false)
    {
        if ($reset) {
            $lang = ($this->langCurrent = null);
        }
        if (! empty($lang)) {
            return ($this->langCurrent = $lang);
        } elseif (! empty($this->langCurrent)) {
            return $this->langCurrent;
        } else {
            return bff::locale()->getCurrentLanguage();
        }
    }
}