Lenius\Basket\Tax

Complexity

Total Complexity

6

Size/Duplication

Total Lines	68
Duplicated Lines	0 %

Coupling/Cohesion

Components	2
Dependencies	0

Test Coverage

Coverage

100%

Importance

Changes

0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	deduct()	0	4	1
A	add()	0	4	1
A	rate()	0	4	1
A	__construct()	0	11	3

<?php

/**
 * This file is part of Lenius Basket, a PHP package to handle
 * your shopping basket.
 *
 * Copyright (c) 2017 Lenius.
 * https://github.com/lenius/basket
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @author Carsten Jonstrup<info@lenius.dk>
 * @copyright 2017 Lenius.
 *
 * @version production
 *
 * @see https://github.com/lenius/basket
 */

namespace Lenius\Basket;

/**
 * Class Tax.
 */
class Tax
{
    /** @var float */
    public $percentage;

    /** @var float */
    public $deductModifier;

    /** @var float */
    public $addModifier;

    /**
     * When constructing the tax class, you can either
     * pass in a percentage, or a price before and after
     * tax and have the library work out the tax rate
     * automatically.
     *
     * @param float $value The percentage of your tax (or price before tax)
     * @param null $after The value after tax
     */
    public function __construct(float $value, $after = null)
    {
        $this->percentage = $value;

        if ($after != null && is_numeric($after)) {
            $this->percentage = (($after - $value) / $value) * 100;
        }

        $this->deductModifier = 1 - ($this->percentage / 100);
        $this->addModifier = 1 + ($this->percentage / 100);
    }

    /**
     * Deduct tax from a specified price.
     *
     * @param float $price The price you want to deduct tax from
     *
     * @return float $price - tax
     */
    public function deduct(float $price): float
    {
        return (float) ($price * $this->deductModifier);
    }

    /**
     * Add tax to a specified price.
     *
     * @param float $price The value you want to add tax to
     *
     * @return float $price + tax
     */
    public function add(float $price): float
    {
        return (float) ($price * $this->addModifier);
    }

    /**
     * Calculate the tax rate from a price.
     *
     * @param float $price The price (after tax)
     *
     * @return float The tax rate
     */
    public function rate(float $price): float
    {
        return (float) ($price - $this->deduct($price));
    }
}