<?php

namespace App\Actions\Document;

use App\Jobs\ProcessUploadedDocumentJob;
use App\Models\Document;
use App\Models\DocumentVersion;
use App\Services\KnowledgeBase\AuditService;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use RuntimeException;

/**
 * CreateDocumentAction
 *
 * Tanggungjawab: Simpan dokumen baru + versi pertama + dispatch job.
 * Dipanggil oleh DocumentController@store.
 */
class CreateDocumentAction
{
    public function __construct(
        private readonly AuditService $auditService
    ) {}

    /**
     * @param  array         $data  Data dari StoreDocumentRequest
     * @param  UploadedFile  $file  Fail PDF yang diupload
     * @return Document
     * @throws RuntimeException
     */
    public function execute(array $data, UploadedFile $file): Document
    {
        // Semak duplicate (hash yang sama dalam kategori yang sama)
        $fileHash = hash_file('sha256', $file->getRealPath());
        $existing = DocumentVersion::where('file_hash', $fileHash)->first();

        if ($existing) {
            throw new RuntimeException(
                "Fail ini sudah pernah diupload. Sila semak dokumen: " .
                $existing->document->title
            );
        }

        return DB::transaction(function () use ($data, $file, $fileHash) {
            // ── Buat rekod dokumen ────────────────────────────────────────
            $document = Document::create([
                'category_id'    => $data['category_id'],
                'title'          => $data['title'],
                'description'    => $data['description'] ?? null,
                'status'         => Document::STATUS_PROCESSING,
                'is_active'      => false,
                'effective_date' => $data['effective_date'] ?? null,
                'expiry_date'    => $data['expiry_date'] ?? null,
                'tags'           => $data['tags'] ?? [],
                'language'       => $data['language'] ?? 'ms',
                'created_by'     => auth()->id(),
                'updated_by'     => auth()->id(),
            ]);

            // ── Simpan fail PDF ────────────────────────────────────────────
            $storedPath = $this->storePdf($file, $document->id, 1);

            // ── Buat rekod versi ──────────────────────────────────────────
            $version = DocumentVersion::create([
                'document_id'       => $document->id,
                'version_number'    => 1,
                'original_filename' => $file->getClientOriginalName(),
                'stored_path'       => $storedPath,
                'mime_type'         => $file->getMimeType(),
                'file_size'         => $file->getSize(),
                'file_hash'         => $fileHash,
                'processing_status' => DocumentVersion::STATUS_PENDING,
                'is_current'        => true,
                'change_notes'      => $data['change_notes'] ?? 'Versi pertama.',
                'uploaded_by'       => auth()->id(),
            ]);

            // ── Audit log ─────────────────────────────────────────────────
            $this->auditService->documentUploaded($document, $version);

            // ── Dispatch job ke queue ─────────────────────────────────────
            ProcessUploadedDocumentJob::dispatch($version->id);

            return $document->load('currentVersion');
        });
    }

    private function storePdf(UploadedFile $file, int $documentId, int $versionNumber): string
    {
        $disk    = config('knowledgebase.upload.storage_disk', 'local');
        $folder  = "documents/{$documentId}/v{$versionNumber}";
        $filename = Str::uuid() . '.pdf';

        $path = $file->storeAs($folder, $filename, $disk);

        if (!$path) {
            throw new RuntimeException('Gagal simpan fail PDF ke storage.');
        }

        return $path;
    }
}