<?php

namespace bff\db\illuminate;

use bff;

/**
 * Langs Columns Json Trait
 *
 * @mixin Model
 * @method QueryBuilder langJsonToString($fields = [], $opts = [])
 * @copyright Tamaranga
 */

trait LangsColumnsJson
{
    protected $langsToStringJson = [];
    protected $langsToStringOpts = [];

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

    /**
     * Get the casts array.
     * @return array
     */
    public function getCasts()
    {
        $casts = parent::getCasts();

        $columns = $this->langColumnsJson();
        foreach ($columns as $v) {
            if (! isset($casts[$v])) {
                $casts[$v] = 'json';
            }
        }

        return $casts;
    }

    public function getLangsToStringJsonJson()
    {
        return $this->langsToStringJson;
    }

    public function getLangsToStringOpts()
    {
        $locale = bff::locale();

        if (method_exists($this, 'langDefault')) {
            $lang = $this->langDefault();
        } else {
            $lang = bff::adminPanel() ? $locale->getAdminLocale() : $locale->getCurrentLanguage();
        }

        return array_merge([
            'lang' => $lang,
            'def' => $locale->getDefaultLanguage(),
        ], $this->langsToStringOpts);
    }

    /**
     * @param EloquentBuilder $query
     * @param array $fields
     * @param array $opts
     */
    public function scopeLangJsonToString($query, $fields = [], $opts = [])
    {
        if (empty($fields)) {
            $fields = $this->langColumnsJson();
        } elseif (is_string($fields)) {
            if (in_array($fields, $this->langColumnsJson())) {
                $fields = [$fields];
            } else {
                $fields = [];
            }
        }
        $this->langsToStringJson = $fields;

        if (! empty($opts)) {
            $this->langsToStringOpts = $opts;
        }
    }

    /**
     * @var \Illuminate\Database\Eloquent\Collection $collection
     * @return \Illuminate\Database\Eloquent\Collection|static[]
     */
    public function jsonLangsMapCollectionGet($collection)
    {
        do {
            $fields = $this->getLangsToStringJsonJson();
            if (empty($fields)) {
                break;
            }
            $opts = $this->getLangsToStringOpts();

            $collection = $collection->map(function ($item) use ($fields, $opts) {
                foreach ($fields as $v) {
                    if (isset($item[$v]) && is_array($item[$v])) {
                        if (isset($item[$v][ $opts['lang'] ])) {
                            $item[$v] = $item[$v][ $opts['lang'] ];
                        } else {
                            if (isset($item[$v][ $opts['def'] ])) {
                                $item[$v] = $item[$v][ $opts['def'] ];
                            } else {
                                $item[$v] = $item[$v][array_key_first($item[$v])];
                            }
                        }
                    }
                }
                return $item;
            });
        } while (false);

        return $collection;
    }

    /**
     * @var \Illuminate\Database\Eloquent\Collection $collection
     * @param string $column
     * @return \Illuminate\Database\Eloquent\Collection|static[]
     */
    public function jsonLangsMapCollectionPluck($collection, $column)
    {
        do {
            if (empty($column)) {
                break;
            }

            $fields = $this->getLangsToStringJsonJson();
            if (empty($fields)) {
                break;
            }

            if (! in_array($column, $fields)) {
                break;
            }

            $opts = $this->getLangsToStringOpts();

            $collection = $collection->map(function ($item) use ($opts) {
                if (is_array($item)) {
                    if (isset($item[ $opts['lang'] ])) {
                        $item = $item[ $opts['lang'] ];
                    } else {
                        if (isset($item[ $opts['def'] ])) {
                            $item = $item[ $opts['def'] ];
                        } else {
                            $item = reset($item);
                        }
                    }
                }
                return $item;
            });
        } while (false);

        return $collection;
    }
}