README

This library allows to create a POS Terminal and count a price for a shopping cart depending on different pricing strategies.

How to install

composer require "feriatos/sigma-test-task:*"

How to use

First create pricing strategies and add products:

$pricing = new OneTierPricing();
$pricing->addProduct(new OneTierProduct('ZA', 2, 7, 4));
$pricing->addProduct(new OneTierProduct('YB', 12));
$pricing->addProduct(new OneTierProduct('FC', 1.25, 6, 6));
$pricing->addProduct(new OneTierProduct('GD', 0.15));

Then create a terminal and set pricing:

$terminal = new POSTerminal();
$terminal->setPricing($pricing);

Scan items:

$terminal->scanItem('ZA');
$terminal->scanItem('YB');
$terminal->scanItem('FC');
$terminal->scanItem('GD');
$terminal->scanItem('ZA');
$terminal->scanItem('YB');
$terminal->scanItem('ZA');
$terminal->scanItem('ZA');

And get a result:

$totalPrice = $terminal->getTotal();

To clean items call:

$terminal->resetItems();

How to extend

This library utilizes Strategy design patter. You could extend it just implementing PricingInterface and ProductInterface and add your own pricing strategy (for example two or three tiers pricing strategy).