<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Services\Audit\AuditLogger;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class BackupController extends Controller
{
    private const SQLITE_HEADER = "SQLite format 3\000";

    public function download(Request $request, AuditLogger $audit)
    {
        abort_unless($request->user()->can('system.manage'), 403);

        $path = config('database.connections.sqlite.database');
        abort_unless($path && is_file($path), 404, 'No database file to back up.');

        $audit->log($request->user(), 'system.backup_downloaded');

        return response()->download($path, 'backup-'.now()->format('Y-m-d-His').'.sqlite');
    }

    public function restore(Request $request, AuditLogger $audit)
    {
        abort_unless($request->user()->can('system.manage'), 403);

        $request->validate(['backup' => ['required', 'file']]);

        $uploaded = $request->file('backup');
        $header = file_get_contents($uploaded->getRealPath(), false, null, 0, 16);

        if ($header !== self::SQLITE_HEADER) {
            throw ValidationException::withMessages([
                'backup' => 'That file is not a valid SQLite database.',
            ]);
        }

        $path = config('database.connections.sqlite.database');

        // Release Laravel's open handle on the current file before swapping it.
        DB::disconnect();

        $safetyCopy = dirname($path).'/pre-restore-'.now()->format('Y-m-d-His').'.sqlite';
        if (is_file($path)) {
            copy($path, $safetyCopy);
        }

        $uploaded->move(dirname($path), basename($path));

        $audit->log($request->user(), 'system.backup_restored');

        return response()->noContent();
    }
}