<?php

namespace bff\db\illuminate;

use bff;

/**
 * Langs Columns Trait
 *
 * @mixin Model
 * @copyright Tamaranga
 */
trait LangsColumns
{
    use LangsBase;

    public static function bootLangsColumns()
    {
        static::saving(function ($model) {
            $model->moveLangAttributes();
        });

        static::saved(function ($model) {
            $model->moveLangAttributes(false);
        });
    }

    /**
     * Join language data
     *
     * @param QueryBuilder $query
     * @param array $columns
     * @return array result columns
     */
    public function joinLangs($query, array $columns = ['*'])
    {
        $lang = $this->langDefault();
        if ($columns === ['*']) {
            if ($query->hasColumns()) {
                $columns = $query->getColumns();
            }
        } else {
            if ($query->hasColumns()) {
                $columns = array_merge($query->getColumns(), $columns);
            }
        }
        if ($columns === ['*'] || in_array($this->getTable() . '.*', $columns, true)) {
            foreach ($this->langColumns() as $column) {
                $columns[] = $column;
            }
        }
        foreach ($columns as $key => $column) {
            if ($this->isLangColumn($column)) {
                $columns[$key] = $this->prefixColumn($column . '_' . $lang) . ' as ' . $column;
            } else {
                $columns[$key] = $this->prefixColumn($column);
            }
        }
        return $columns;
    }

    /**
     * Transforms translatable data key_lang=>value to key=>[lang=>value, ...]
     *
     * @param bool $removeOriginals
     * @return void
     */
    public function langDataTransform($removeOriginals = true)
    {
        $columns = $this->langColumns();
        if (empty($columns) || $columns === ['*']) {
            return;
        }

        $langs = $this->langsList();
        $langsFill = array_fill_keys($langs, '');

        $attr = $this->attributesToArray();
        foreach ($columns as $col) {
            $values = $langsFill;
            foreach ($langs as $lang) {
                $key = $col . '_' . $lang;
                if (array_key_exists($key, $attr)) {
                    $values[$lang] = $attr[$key];
                }
                if ($removeOriginals) {
                    unset($this->attributes[$key]);
                }
            }
            parent::setAttribute($col, $values);
        }
    }

    /**
     * Covers translatable attributes
     *
     * @param string $key
     * @param mixed $value
     * @return mixed
     */
    public function setAttribute($key, $value)
    {
        if ($this->isLangColumn($key)) {
            $langs = $this->langsList();
            if (is_string($value)) {
                $value = [$this->langDefault() => $value];
            }
            if (is_array($value)) {
                foreach ($value as $lang => $v) {
                    if (in_array($lang, $langs, true)) {
                        $col = $key . '_' . $lang;
                        if ($v !== ($this->attributes[$key][$lang] ?? '')) {
                            $this->changes[$col] = $v;
                            parent::setAttribute($col, $v);
                        }
                    }
                }
            }
            return $this;
        }

        return parent::setAttribute($key, $value);
    }
}