<?php

namespace App\Tasks\MassUpdate\Group2;

use App\Models\Transaction;
use Carbon\Carbon;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;

class MassUpdate6Task
{
    /**
     *
     *    1000 ........... 7s DONE
     *   10000 .........    - DONE
     *  100000 ......... .  - DONE
     * 1000000 ..........   - DONE
     */
    public function handle(): void
    {
        Transaction::query()
            ->select([
                'id',
                'date',
                'value',
            ])
            ->where('id', '>', 0)
            ->chunkById(1000, function ($transactions) {

                $items = [];
                /** @var Collection $transactions */
                foreach ($transactions as $transaction) {
                    $transaction->date = Carbon::now()->subDays(random_int(1, 3));
                    $transaction->value = 10 + random_int(0, 10);

                    $items[] = [
                        'id' => $transaction->id,
                        'date' => $transaction->date,
                        'value' => $transaction->value,
                    ];
                }

                $withs = [];
                $unions = [];
                foreach ($items as $key => $item) {
                    $withs[] = vsprintf('u%s as (update transactions set value = %s where id = %s returning null)', [
                        $key,
                        $item['value'],
                        $item['id'],
                    ]);

                    $unions[] = vsprintf('u%s', [
                        $key
                    ]);
                }

                $withs = implode(', ', $withs);
                $unions = implode(', ', $unions);

                $sql = "with $withs, uall as (select * from $unions) select * from uall";

                DB::statement($sql);
            });
    }

}