<?php

namespace App\Services;

use App\Models\Submission;
use App\Models\SubmissionDocument;
use App\Models\User;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class DocumentService
{
    /**
     * Simpan laporan PDF baharu untuk serahan dengan versi & hash.
     * Versi sebelumnya ditanda tidak aktif tetapi dikekalkan (sejarah versi).
     * Fail disimpan pada disk 'local' (di luar direktori public).
     */
    public function store(Submission $submission, UploadedFile $file, User $user): SubmissionDocument
    {
        return DB::transaction(function () use ($submission, $file, $user) {
            $nextVersion = (int) $submission->documents()->max('version') + 1;

            $hash = hash_file('sha256', $file->getRealPath());
            $path = $file->storeAs(
                "reports/{$submission->id}",
                'v'.$nextVersion.'_'.uniqid().'.pdf',
                'local'
            );

            // Nyahaktifkan versi aktif sebelumnya.
            $submission->documents()->where('is_active', true)->update(['is_active' => false]);

            $document = $submission->documents()->create([
                'original_filename' => $file->getClientOriginalName(),
                'stored_path' => $path,
                'file_hash' => $hash,
                'mime_type' => $file->getClientMimeType(),
                'size' => $file->getSize(),
                'version' => $nextVersion,
                'is_active' => true,
                'uploaded_by' => $user->id,
            ]);

            activity('dokumen')
                ->performedOn($submission)
                ->causedBy($user)
                ->withProperties(['version' => $nextVersion, 'filename' => $document->original_filename])
                ->log('Laporan PDF dimuat naik');

            return $document;
        });
    }

    public function setActiveVersion(Submission $submission, SubmissionDocument $document): void
    {
        $submission->documents()->where('is_active', true)->update(['is_active' => false]);
        $document->update(['is_active' => true]);
    }

    public function download(SubmissionDocument $document)
    {
        abort_unless(Storage::disk('local')->exists($document->stored_path), 404, 'Fail laporan tidak dijumpai.');

        return Storage::disk('local')->download($document->stored_path, $document->original_filename);
    }
}