<?php
declare(strict_types=1);

namespace Esun\Catalog\Model\MixStepPricing;

use Magento\Backend\Model\Session;

class ValidationState
{
    private const PREFIX = 'esun_mix_step_pricing_';
    private const STATE_VERSION = 2;

    public function __construct(private readonly Session $session)
    {
    }

    public function save(string $type, string $path, array $result): void
    {
        $validRows = (array)($result['valid_rows'] ?? []);
        $invalidRows = (array)($result['invalid_rows'] ?? []);
        $preview = array_slice($validRows, 0, 100);
        $invalidPreview = array_slice($invalidRows, 0, 100);

        $this->session->setData(self::PREFIX . $type, [
            'version' => self::STATE_VERSION,
            'path' => $path,
            'valid' => (bool)$result['valid'],
            'stats' => $result['stats'],
            'errors' => $result['errors'],
            'warnings' => $result['warnings'],
            'preview' => $preview,
            'preview_truncated' => count($validRows) > 100,
            'invalid_preview' => $invalidPreview,
            'invalid_preview_truncated' => count($invalidRows) > 100,
        ]);
    }

    public function get(string $type): array
    {
        $state = (array)$this->session->getData(self::PREFIX . $type);
        if ($state !== [] && (int)($state['version'] ?? 0) !== self::STATE_VERSION) {
            $this->clear($type);
            return [];
        }

        return $state;
    }

    public function clear(string $type): void
    {
        $this->session->unsetData(self::PREFIX . $type);
    }
}