<?php
namespace Komma\KMS\Core;

use Illuminate\Support\Carbon;
use Komma\KMS\Core\Entities\DisplayNameTrait;
use Komma\KMS\Globalization\Languages\Models\Language;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

/**
 * Represents a translation for a AbstractTranslatableModel implementation
 *
 * @property string title
 * @property string description
 *
 * @note make sure that the implementation has a name attribute and not a title attribute
 * @see AbstractTranslatableModel
 */
abstract class AbstractTranslationModel extends Model
{
    use DisplayNameTrait;

    /**
     * @return BelongsTo relation That resolves to a TranslatableModelInterface
     * @see AbstractTranslatableModel
     */
    abstract public function translatable(): BelongsTo;

    /**
     * @return belongsTo relation That resolves to a Language model
     * @see Language
     */
    public function language():BelongsTo {
        return $this->belongsTo(Language::class);
    }

    /**
     * Returns the 2 character length iso 2 code of the language of the model
     *
     * @return string
     */
    public function getLanguageIso(){
        return $this->language()->first()->iso_2;
    }

    /**
     * Returns true or false depending on whether or not the translation can be considered empty
     *
     * @return bool
     */
    public function isEmpty():bool
    {
        $empty = true;

        foreach($this->attributes as $attributeName => $value)
        {
            if(substr($attributeName, -3) == '_id') continue;
            if($value != "" && $value != "[]") {
                $empty = false;
                break;
            }
        }

        return $empty;
    }

    public function setUpdatedAtAttribute($value) {
        $timestamp = $this->fixInvalidDateValueIfNeeded($value);
        parent::setUpdatedAt($timestamp);
    }

    public function setCreatedAt($value) {
        $timestamp = $this->fixInvalidDateValueIfNeeded($value);
        parent::setCreatedAt($timestamp);
    }

    public function save(array $options = []) {
        if(!$this->exists || $this->wasRecentlyCreated) {
            //This is needed because sometimes we don't set the updated_at attribute resulting in an invalid date being set in some cases.
            //Attributes will always return string values, and in this case, because there is no updated_at date, it return a date that is not valid.
            $timestamp = $this->fixInvalidDateValueIfNeeded(null);
            $this->setUpdatedAt($timestamp);
            $this->setCreatedAt($timestamp);
        }
        return parent::save($options);
    }

    private function fixInvalidDateValueIfNeeded($value) {
        if(
            $value && //Value must be set
            substr((Carbon::parse($value))->toDateTimeString(), 0, 1) === '-' //Time value must not start with a dash. Example of invalid date: ) {
        ) {
            //invalid date detected. Force it to the "now date"
            return Carbon::now()->timestamp;
        }
        return $value;
    }
}