<?php

namespace App\Tools;

class CollectOffsetLimit
{
    private $offset = 0;
    private $limit = 1000;
    private $page = 0;

    private $iTotalCount = null;

    public $fCountFun;


    function setCountFun(\Closure $fun)
    {
        $this->fCountFun = $fun();
        return $this;
    }


    private function countPage()
    {
        if($this->iTotalCount === null && $this->fCountFun !== null){
            $this->iTotalCount = $this->fCountFun;
        }
        if(empty($this->page) && !empty($this->iTotalCount)){
            $this->page = ceil($this->iTotalCount / $this->limit);
        }
    }

    function runWhile(\Closure $fun)
    {
        $this->countPage();
        if($this->iTotalCount === null) $this->iTotalCount = $this->fCountFun;
        if($this->iTotalCount === 0 || $this->page === 0) return [];
        for( $iPage = 1; $iPage <= $this->page; $iPage++){
            $this->offset = ($iPage - 1) * $this->limit;
            $fun($this->offset,$this->limit);
        }
        $this->offset = 0;

    }

    public function getLimit(): int
    {
        return $this->limit;
    }

    public function setLimit(int $limit): void
    {
        $this->limit = $limit;
    }

    public function getOffset(): int
    {
        return $this->offset;
    }

    public function setOffset(int $offset): void
    {
        $this->offset = $offset;
    }

    /**
     * @return null
     */
    public function getITotalCount()
    {
        return $this->iTotalCount;
    }

    /**
     * @param null $iTotalCount
     */
    public function setITotalCount($iTotalCount): CollectOffsetLimit
    {
        $this->iTotalCount = $iTotalCount;
        return $this;
    }
}