<?php

namespace App\Support;

use App\Enums\AiDeclarationSource;
use App\Models\Company;
use App\Models\ImageRightsConfirmation;
use App\Models\PressReleaseImage;
use Illuminate\Support\Str;

/**
 * Eine Auflösung des Bildnachweises für alle Ausgaben (Bildkennzeichnung
 * D.1): Artikelseite, Kunden- und Adminansicht, Beleg-PDF, Overlay.
 *
 * Regeln (Decision-Update 3.4):
 * - Nachweiszeile: „Foto: [copyright]", sonst „Foto: [author]", sonst im
 *   Bestand „Quelle: [Firma]".
 * - KI-Zusatz aus der Portalkennzeichnung, Bestand-Fallback `is_ai_generated`.
 * - Verantwortlich-Zeile „Bild und Angaben: [Firma], eingereicht am [Datum]"
 *   NUR mit Bestätigungsprotokoll — der Altbestand hat keins.
 * - Links nur mit http/https.
 */
final readonly class ImageCredit
{
    private function __construct(
        public ?string $credit,
        public string $creditLabel,
        public ?string $aiLabel,
        public ?string $aiSourceLabel,
        public ?string $licenseUrl,
        public ?string $sourceUrl,
        public ?string $responsibleLine,
        public ?ImageRightsConfirmation $confirmation,
        public bool $isLegacy,
    ) {}

    public static function for(PressReleaseImage $image, ?Company $company = null): self
    {
        $company ??= $image->pressRelease?->company;
        $companyName = $company?->name;

        $credit = self::clean($image->copyright) ?? self::clean($image->author);
        $creditLabel = __('web.detail.photo');

        if ($credit === null && $image->isLegacyRules() && filled($companyName)) {
            $credit = $companyName;
            $creditLabel = __('web.detail.source');
        }

        $aiLabel = $image->ai_declaration?->publicLabel() ?? ($image->is_ai_generated ? __('KI-generiert') : null);

        $confirmation = $image->relationLoaded('latestRightsConfirmation')
            ? $image->latestRightsConfirmation
            : $image->latestRightsConfirmation()->first();

        $responsible = null;

        if ($confirmation !== null && filled($companyName)) {
            $responsible = __('web.detail.image_responsible', [
                'company' => $companyName,
                'date' => $confirmation->confirmed_at->locale('de')->isoFormat('D. MMMM YYYY'),
            ]);
        }

        return new self(
            credit: $credit,
            creditLabel: $creditLabel,
            aiLabel: $aiLabel,
            aiSourceLabel: $aiLabel !== null ? $image->ai_declaration_source?->publicLabel() ?? ($image->isLegacyRules() ? null : AiDeclarationSource::Customer->publicLabel()) : null,
            licenseUrl: self::safeUrl($image->license_url),
            sourceUrl: self::safeUrl($image->source_url),
            responsibleLine: $responsible,
            confirmation: $confirmation,
            isLegacy: $image->isLegacyRules(),
        );
    }

    /**
     * Zeile aus Einzelteilen — für den eingebrannten OG-Balken beim Upload,
     * bevor es ein Modell gibt (H.1).
     */
    public static function compose(?string $credit, ?string $aiLabel, ?string $label = null): ?string
    {
        $credit = self::clean($credit);
        $parts = [];

        if ($credit !== null) {
            $parts[] = ($label ?? __('web.detail.photo')).': '.$credit;
        }

        if ($aiLabel !== null && $aiLabel !== '') {
            $parts[] = $aiLabel;
        }

        return $parts === [] ? null : implode(' · ', $parts);
    }

    /**
     * Sichtbare Zeile unter dem Bild, z. B. „Foto: Musterfirma · KI-generiert".
     */
    public function line(): ?string
    {
        if ($this->credit === null && $this->aiLabel === null) {
            return null;
        }

        $parts = [];

        if ($this->credit !== null) {
            $parts[] = $this->creditLabel.': '.$this->credit;
        }

        if ($this->aiLabel !== null) {
            $parts[] = $this->aiLabel;
        }

        return implode(' · ', $parts);
    }

    public function hasDetails(): bool
    {
        return $this->credit !== null || $this->aiLabel !== null || $this->responsibleLine !== null;
    }

    /**
     * Zeilen für das Beleg-PDF (D.4).
     *
     * @return list<string>
     */
    public function pdfLines(): array
    {
        $lines = [];

        if ($this->credit !== null) {
            $lines[] = 'Bildnachweis: '.$this->credit;
        }

        if ($this->licenseUrl !== null) {
            $lines[] = 'Lizenz: '.$this->licenseUrl;
        }

        if ($this->sourceUrl !== null) {
            $lines[] = 'Quelle: '.$this->sourceUrl;
        }

        if ($this->aiLabel !== null) {
            $lines[] = 'KI-Kennzeichnung: '.$this->aiLabel.($this->aiSourceLabel !== null ? ' ('.$this->aiSourceLabel.')' : '');
        }

        if ($this->confirmation !== null) {
            $lines[] = sprintf(
                'Rechte bestätigt am %s (%s, AGB %s)',
                $this->confirmation->confirmed_at->format('d.m.Y H:i'),
                $this->confirmation->legal_text_key,
                $this->confirmation->agb_version ?? '–',
            );
        }

        return $lines;
    }

    private static function clean(?string $value): ?string
    {
        $value = trim((string) $value);

        return $value !== '' ? $value : null;
    }

    private static function safeUrl(?string $url): ?string
    {
        $url = trim((string) $url);

        if ($url === '' || ! Str::startsWith(strtolower($url), ['http://', 'https://'])) {
            return null;
        }

        return filter_var($url, FILTER_VALIDATE_URL) !== false ? $url : null;
    }
}