<?php

namespace App\Observers;

use App\Models\Part;
use Illuminate\Database\Eloquent\Model;

class PartObserver extends BaseObserver
{

    private function logPriceChange(Part $part, bool $isCreate = true): void
    {
        $path = storage_path('logs');

        $fileName = date('Y-m-d') . '_part_prices.csv';
        $fullPath = $path . '/' . $fileName;

        if (file_exists($fullPath)) {
            $file = fopen($fullPath, 'ab');
        } else {
            $file = fopen($fullPath, 'wb');
            fwrite($file, "\xEF\xBB\xBF"); // BOM для UTF-8

            $columns = [
                'Дата',
                'Артикул',
                'Старая цена',
                'Новая цена',
                'Действие',
            ];

            fputcsv($file, $columns);
        }

        $data = [
            'Дата' => date('Y-m-d H:i:s'),
            'Артикул' => $part->external_id,
            'Старая цена' => $isCreate ? null : $part->getOriginal('price'),
            'Новая цена' => $part->price,
            'Действие' => $isCreate ? 'CREATE' : 'UPDATE',
        ];

        fputcsv($file, $data);

        fclose($file);
    }

    public function created(Model $model)
    {
        $this->logPriceChange($model);
    }

    public function updated(Model $model)
    {
        /** @var Part $model */
        $priceChanged = $model->price !== $model->getOriginal('price');

        if ($priceChanged) {
            $this->logPriceChange($model, false);
        }
    }

}