<?php

namespace App\Http\Controllers;

use App\Models\Backup;
use Illuminate\Support\Facades\DB;

class BackupController extends Controller
{
    public function index()
    {
//        $files = Storage::disk('public')->allFiles('uploads/sql');
        $pageConfigs = [
            'pageHeader' => true,
            'showMenu' => true
        ];
        $breadcrumbs = [['link' => '/admin/backup', 'name' => 'Home'], ['name' => 'Backup']];
        $backups = Backup::all();
        return view('content.backups', [
            'pageConfigs' => $pageConfigs,
            'breadcrumbs' => $breadcrumbs,
            'backups' => $backups,
        ]);
    }

    public function createBackup(){

        try {

            $results=DB::transaction(function (){
                $DB_HOST     = 'localhost';
                $DB_DATABASE = config('database.connections.mysql.database');
                $DB_USERNAME = config('database.connections.mysql.username');
                $DB_PASSWORD = config('database.connections.mysql.password');

                $connection  = mysqli_connect($DB_HOST, $DB_USERNAME, $DB_PASSWORD, $DB_DATABASE);

                $tables = array();
                $result = mysqli_query($connection, "SHOW TABLES");
                while ($row = mysqli_fetch_row($result)) {
                    $tables[] = $row[0];
                }
                $return = '';

                foreach ($tables as $table) {
                    $result     = mysqli_query($connection, "SELECT * FROM " . $table);
                    $num_fields = mysqli_num_fields($result);

                    $return .= 'DROP TABLE IF EXISTS ' . $table . ';';
                    $row2 = mysqli_fetch_row(mysqli_query($connection, "SHOW CREATE TABLE " . $table));
                    $return .= "\n\n" . $row2[1] . ";\n\n";

                    for ($i = 0; $i < $num_fields; $i++) {
                        while ($row = mysqli_fetch_row($result)) {
                            $return .= "INSERT INTO " . $table . " VALUES(";
                            for ($j = 0; $j < $num_fields; $j++) {
                                $row[$j] = addslashes($row[$j]);
                                if (isset($row[$j])) {
                                    $return .= ($row[$j] == NULL || $row[$j] == '') ? 'NULL' : '"' . $row[$j] . '"';
                                } else {
                                    $return .= 'NULL';
                                }
                                if ($j < $num_fields - 1) {
                                    $return .= ',';
                                }
                            }
                            $return .= ");\n";
                        }
                    }
                    $return .= "\n\n\n";
                }

                if (!file_exists('backups')) {
                    mkdir('backups', 0777, true);
                }
                //save file
                $name   = 'database_backup_'. date('d_m_Y').'_'.time().'.sql';
                $path   = 'backups/' . $name;
                $handle = fopen($path, "w+");
                fwrite($handle, $return);
                fclose($handle);

                //save backup detail to db
                Backup::create(['path' => $path]);

                return true;
            });

            return redirect()->back()-> with([
                'success' => "Database backup generated successfully"
            ]);

        } catch (\Exception $e) {
            return redirect()->back()-> with([
                'error' => $e->getMessage()
            ]);
        }
    }


    public function downloadBackup(Backup $backup)
    {
        return response()->download($backup->path);
    }

    public function deleteBackup(Backup $backup)
    {
        if (file_exists($backup->path)){
            unlink($backup->path);
        }
        $backup->delete();
        return redirect()->back()-> with([
            'success' => "Database backup deleted successfully"
        ]);
    }
}