<?php

namespace App\Services;

use App\Models\Service;
use Illuminate\Support\Facades\Storage;
use InvalidArgumentException;
use ProPresenter\Parser\ProFileGenerator;
use RuntimeException;
use ZipArchive;

class ProBundleExportService
{
    private const ALLOWED_BLOCK_TYPES = ['information', 'moderation', 'sermon'];

    public function generateBundle(Service $service, string $blockType): string
    {
        if (! in_array($blockType, self::ALLOWED_BLOCK_TYPES, true)) {
            throw new InvalidArgumentException('Ungültiger Blocktyp für .probundle Export.');
        }

        $slides = $service->slides()
            ->where('type', $blockType)
            ->orderBy('sort_order')
            ->get();

        $groupName = ucfirst($blockType);
        $slideData = [];
        $mediaFiles = [];

        foreach ($slides as $slide) {
            $sourcePath = Storage::disk('public')->path('slides/'.$slide->stored_filename);
            if (! file_exists($sourcePath)) {
                continue;
            }

            $imageFilename = basename($slide->stored_filename);
            $imageContent = file_get_contents($sourcePath);
            if ($imageContent === false) {
                continue;
            }

            $mediaFiles[$imageFilename] = $imageContent;

            $slideData[] = [
                'text' => $slide->original_filename ?? '',
                'media' => $imageFilename,
                'format' => 'JPG',
            ];
        }

        $groups = [
            [
                'name' => $groupName,
                'color' => [0, 0, 0, 1],
                'slides' => $slideData,
            ],
        ];

        $arrangements = [
            [
                'name' => 'normal',
                'groupNames' => [$groupName],
            ],
        ];

        $song = ProFileGenerator::generate($groupName, $groups, $arrangements);
        $protoBytes = $song->getPresentation()->serializeToString();

        $bundlePath = sys_get_temp_dir().'/'.uniqid($blockType.'-').'.probundle';

        $zip = new ZipArchive();
        $openResult = $zip->open($bundlePath, ZipArchive::CREATE | ZipArchive::OVERWRITE);
        if ($openResult !== true) {
            throw new InvalidArgumentException('Konnte .probundle nicht erstellen.');
        }

        $this->addStoredEntry($zip, 'data', $protoBytes);

        foreach ($mediaFiles as $filename => $contents) {
            $this->addStoredEntry($zip, $filename, $contents);
        }

        if (! $zip->close()) {
            throw new RuntimeException('Fehler beim Finalisieren der .probundle Datei.');
        }

        return $bundlePath;
    }

    private function addStoredEntry(ZipArchive $zip, string $entryName, string $contents): void
    {
        if (! $zip->addFromString($entryName, $contents)) {
            throw new RuntimeException(sprintf('Fehler beim Hinzufügen von %s zur .probundle Datei.', $entryName));
        }

        if (! $zip->setCompressionName($entryName, ZipArchive::CM_STORE)) {
            throw new RuntimeException(sprintf('Fehler beim Setzen der Kompression für %s.', $entryName));
        }
    }
}