invoiceninja/app/Helpers/Invoice/InvoiceItemSum.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com)
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2019. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Helpers\Invoice;

use App\DataMapper\BaseSettings;
use App\DataMapper\InvoiceItem;
use App\Helpers\Invoice\Discounter;
use App\Helpers\Invoice\Taxer;
use App\Models\Invoice;
use App\Utils\Traits\NumberFormatter;
use Illuminate\Support\Collection;

class InvoiceItemSum
{

	use NumberFormatter;
	use Discounter;
	use Taxer;

	protected $invoice;

	private $items;

	private $line_total;

	private $currency;

	private $total_taxes;

	private $item;

	private $line_items;

	private $sub_total;

	private $total_discount;

	private $tax_collection;

	public function __construct($invoice)
	{

		$this->tax_collection = collect([]);

		$this->invoice = $invoice;

		$this->currency = $this->invoice->client->currency();

		$this->line_items = [];
	}

	public function process()
	{

		if(!$this->invoice->line_items || !isset($this->invoice->line_items) || count($this->invoice->line_items) == 0){
			$this->items = [];
			return $this;
		}

		$this->calcLineItems();

		return $this;
	}

	private function calcLineItems()
	{
		foreach($this->invoice->line_items as $this->item)
		{
			$this->cleanLineItem()
				->sumLineItem()
				->setDiscount()
				->calcTaxes()
				->push();
		}

		return $this;
	}

	private function push()
	{

		$this->sub_total += $this->getLineTotal();

		$this->line_items[] = $this->item;

		return $this;
	}

	private function sumLineItem()
	{
		$this->setLineTotal($this->formatValue($this->item->cost, $this->currency->precision) * $this->formatValue($this->item->quantity, $this->currency->precision));
		return $this;
	}

	private function setDiscount()
	{

		if($this->invoice->is_amount_discount)
		{	
			$this->setLineTotal($this->getLineTotal() - $this->formatValue($this->item->discount, $this->currency->precision));
		}
		else
		{
			$this->setLineTotal($this->getLineTotal() - $this->formatValue(round($this->item->line_total * ($this->item->discount / 100),2), $this->currency->precision));
		}

		$this->item->is_amount_discount = $this->invoice->is_amount_discount;

		return $this;
        
	}

	private function calcTaxes()
	{

		$item_tax = 0;

			$amount = $this->item->line_total - ($this->item->line_total * ($this->invoice->discount/100));
			$item_tax_rate1_total = $this->calcAmountLineTax($this->item->tax_rate1, $amount);

			$item_tax += $item_tax_rate1_total;

			if($item_tax_rate1_total > 0)
				$this->groupTax($this->item->tax_name1, $this->item->tax_rate1, $item_tax_rate1_total);
		
			$item_tax_rate2_total = $this->calcAmountLineTax($this->item->tax_rate2, $amount);

			$item_tax += $item_tax_rate2_total;

			if($item_tax_rate2_total > 0)
				$this->groupTax($this->item->tax_name2, $this->item->tax_rate2, $item_tax_rate2_total);

			$item_tax_rate3_total = $this->calcAmountLineTax($this->item->tax_rate3, $amount);

			$item_tax += $item_tax_rate3_total;

			if($item_tax_rate3_total > 0)
				$this->groupTax($this->item->tax_name3, $this->item->tax_rate3, $item_tax_rate3_total);


		$this->setTotalTaxes($this->formatValue($item_tax, $this->currency->precision));

		return $this;
	}

	private function groupTax($tax_name, $tax_rate, $tax_total) 
	{
		$group_tax = [];

		$key = str_replace(" ", "", $tax_name.$tax_rate);

		$group_tax = ['key' => $key, 'total' => $tax_total, 'tax_name' => $tax_name . ' ' . $tax_rate.'%']; 

		$this->tax_collection->push(collect($group_tax));
		
	}

	public function getTotalTaxes()
	{
		return $this->total_taxes;
	}

	public function setTotalTaxes($total)
	{
		$this->total_taxes = $total;

		return $this;
	}

	public function setLineTotal($total)
	{
		$this->item->line_total = $total;

		return $this;
	}

	public function getLineTotal()
	{
		return $this->item->line_total;
	}

	public function getLineItems()
	{
		return $this->line_items;
	}

	public function getGroupedTaxes()
	{ 
		return $this->tax_collection;
	}

	public function setGroupedTaxes($group_taxes)
	{
		$this->tax_collection = $group_taxes;

		return $this;
	}

	public function getSubTotal()
	{
		return $this->sub_total;
	}

	public function setSubTotal($value)
	{
		$this->sub_total = $value;
		return $this;
	}


	/**
	 * Invoice Amount Discount
	 *
	 * The problem, when calculating invoice level discounts,
	 * the tax collected changes.
	 *
	 * We need to synthetically reduce the line_total amounts 
	 * and recalculate the taxes and then pass back
	 * the updated map
	 */
	
	public function calcTaxesWithAmountDiscount()
	{
		$this->setGroupedTaxes(collect([]));

		$item_tax = 0;

		foreach($this->line_items as $this->item)
		{

			if($this->item->line_total == 0)
				continue;

			$amount = $this->item->line_total - ($this->item->line_total * ($this->invoice->discount/$this->sub_total));
			$item_tax_rate1_total = $this->calcAmountLineTax($this->item->tax_rate1, $amount);

			$item_tax += $item_tax_rate1_total;

			if($item_tax_rate1_total > 0)
				$this->groupTax($this->item->tax_name1, $this->item->tax_rate1, $item_tax_rate1_total);
		
			$item_tax_rate2_total = $this->calcAmountLineTax($this->item->tax_rate2, $amount);

			$item_tax += $item_tax_rate2_total;

			if($item_tax_rate2_total > 0)
				$this->groupTax($this->item->tax_name2, $this->item->tax_rate2, $item_tax_rate2_total);

			$item_tax_rate3_total = $this->calcAmountLineTax($this->item->tax_rate3, $amount);

			$item_tax += $item_tax_rate3_total;

			if($item_tax_rate3_total > 0)
				$this->groupTax($this->item->tax_name3, $this->item->tax_rate3, $item_tax_rate3_total);


		}

		$this->setTotalTaxes($item_tax);

	}

	/**
	 * Sets default values for the line_items
	 * @return $this 
	 */
	private function cleanLineItem()
	{
		$invoice_item = (object)get_class_vars(InvoiceItem::class);
		unset($invoice_item->casts);

		foreach($invoice_item as $key => $value)
		{

			if(!property_exists($this->item, $key) || !isset($this->item->{$key})){
				$this->item->{$key} = $value;
				$this->item->{$key} = BaseSettings::castAttribute(InvoiceItem::$casts[$key], $value);
			}			


		}


		return $this;
	}
}