<?php

namespace App\Enums;

/**
 * Befund einer URL-Inspektion, auf das reduziert, was in jeder Anzeige
 * unterschieden werden muss (Anhang 17.09.2026, 1c.4): „noch nicht
 * gecrawlt" und „gecrawlt, aber nicht indexiert" sind verschiedene Befunde.
 */
enum IndexState: string
{
    case Indexed = 'indexed';
    case CrawledNotIndexed = 'crawled_not_indexed';
    case NotCrawled = 'not_crawled';
    case Excluded = 'excluded';
    case Unknown = 'unknown';

    /**
     * @param  array<string, mixed>  $indexStatus  `inspectionResult.indexStatusResult` der URL Inspection API
     */
    public static function fromIndexStatus(array $indexStatus): self
    {
        $verdict = strtoupper((string) ($indexStatus['verdict'] ?? ''));
        $coverage = mb_strtolower((string) ($indexStatus['coverageState'] ?? ''));
        $indexing = strtoupper((string) ($indexStatus['indexingState'] ?? ''));
        $robots = strtoupper((string) ($indexStatus['robotsTxtState'] ?? ''));
        $fetch = strtoupper((string) ($indexStatus['pageFetchState'] ?? ''));
        $crawled = ! empty($indexStatus['lastCrawlTime']);

        if ($verdict === 'PASS' || (str_contains($coverage, 'indexed') && ! str_contains($coverage, 'not indexed'))) {
            return self::Indexed;
        }

        if ($robots === 'DISALLOWED'
            || in_array($indexing, ['BLOCKED_BY_META_TAG', 'BLOCKED_BY_HTTP_HEADER', 'BLOCKED_BY_ROBOTS_TXT'], true)
            || ($fetch !== '' && $fetch !== 'SUCCESSFUL' && $crawled)
            || str_contains($coverage, 'duplicate')
            || str_contains($coverage, 'canonical')
            || str_contains($coverage, 'redirect')
            || str_contains($coverage, 'noindex')
            || str_contains($coverage, 'blocked')) {
            return self::Excluded;
        }

        if (! $crawled) {
            return $verdict === '' && $coverage === '' ? self::Unknown : self::NotCrawled;
        }

        return self::CrawledNotIndexed;
    }

    public function label(): string
    {
        return match ($this) {
            self::Indexed => 'indexiert',
            self::CrawledNotIndexed => 'gecrawlt, nicht indexiert',
            self::NotCrawled => 'noch nicht gecrawlt',
            self::Excluded => 'ausgeschlossen',
            self::Unknown => 'unbekannt',
        };
    }
}