<?php
/**
 * BCmath 封装类
 * Calc::init(10)->add(1,2,3)->sub(1,2)->mul(4, 5)->value(2); // （10+1+2+3-1-2)*4*5 最后 get 保留 2位小数
 * Calc::add(10, 2)->div(2)->value(2);
 */
namespace App\Helpers;

/**
 * @method \App\Helpers\Calc add(number ...$value) 加法
 * @method \App\Helpers\Calc sub(number ...$value) 减法
 * @method \App\Helpers\Calc mul(number ...$value) 乘法
 * @method \App\Helpers\Calc div(number ...$value) 除法
 * @method \App\Helpers\Calc comp(number ...$value) 比较
 * @method \App\Helpers\Calc mod(number ...$value) 取模
 * @method \App\Helpers\Calc pow(number ...$value) 乘方
 * @method \App\Helpers\Calc sqrt(number ...$value) 开方
 */

class Calc {

    protected $init = 0;
    protected $carry = [];

    public function __construct($value = 0)
    {
        $this->init = $value;
    }

    public static function init($value = 0)
    {
        return new static($value);
    }

    public static function __callStatic($method, $args)
    {
        return self::init(array_shift($args))->$method(...$args);
    }

    public function __call($method, $args)
    {
        $this->carry[] = ['bc' . $method => $args];
        return $this;
    }

    /**
     * 获取值
     * @param int $scale 保留小数位
     * @return int
     */
    public function value($scale = 2)
    {
        foreach($this->carry as $item){

            foreach($item as $func => $value){

                $this->init = array_reduce($value, function($carry, $val) use($func, $scale){
                    return $func($carry, $val, $scale);
                }, $this->init);

            }
        }
        return $this->init;
    }

}