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<?php |
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declare(strict_types=1); |
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namespace byrokrat\billing; |
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use byrokrat\amount\Amount; |
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/** |
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* Container for billable items |
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*/ |
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class ItemBasket implements \IteratorAggregate |
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{ |
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/** |
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* @var ItemEnvelope[] Contained items |
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*/ |
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private $items = []; |
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/** |
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* @var string Classname of currency used in basket |
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*/ |
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private $currencyClassname = ''; |
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/** |
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* Optionally load items at construct |
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*/ |
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public function __construct(ItemEnvelope ...$items) |
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{ |
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foreach ($items as $envelope) { |
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$this->addItem($envelope); |
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} |
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} |
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/** |
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* Add item to basket |
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* |
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* @throws Exception If two items with different currencies are added |
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*/ |
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public function addItem(ItemEnvelope $envelope): self |
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{ |
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if (!$this->currencyClassname) { |
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$this->currencyClassname = $envelope->getCurrencyClassname(); |
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} |
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if ($envelope->getCurrencyClassname() != $this->getCurrencyClassname()) { |
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throw new Exception('Unable to load items with different currencies'); |
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} |
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$this->items[] = $envelope; |
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return $this; |
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} |
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/** |
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* Get classname of currency used in basket |
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*/ |
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public function getCurrencyClassname(): string |
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{ |
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return $this->currencyClassname; |
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} |
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/** |
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* Create amount object using the current basket currency |
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* |
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* @throws Exception If no item is loaded and currency is unknown |
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*/ |
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public function createCurrencyObject(string $value): Amount |
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{ |
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if (!$currency = $this->getCurrencyClassname()) { |
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throw new Exception('Unable to create currency object, currency unknown.'); |
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} |
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return new $currency($value); |
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} |
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/** |
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* Get contained items |
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* |
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* @return ItemEnvelope[] |
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*/ |
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public function getItems(): array |
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{ |
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return $this->items; |
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} |
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/** |
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* Implements the IteratorAggregate interface |
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*/ |
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public function getIterator(): \Traversable |
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{ |
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foreach ($this->getItems() as $envelope) { |
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yield $envelope; |
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} |
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} |
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/** |
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* Get number of items in basket |
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*/ |
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public function getNrOfItems(): int |
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{ |
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return count($this->getItems()); |
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} |
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/** |
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* Get number of units in basket (each item may contain multiple units) |
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*/ |
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public function getNrOfUnits(): int |
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{ |
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return array_reduce( |
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$this->getItems(), |
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function (int $carry, ItemEnvelope $envelope) { |
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return $carry + $envelope->getNrOfUnits(); |
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}, |
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0 |
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); |
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} |
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/** |
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* Get total cost of all items (VAT excluded) |
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*/ |
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public function getTotalUnitCost(): Amount |
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{ |
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return $this->reduce('getTotalUnitCost'); |
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} |
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/** |
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* Get total VAT cost for all items |
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*/ |
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public function getTotalVatCost(): Amount |
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{ |
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return $this->reduce('getTotalVatCost'); |
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} |
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/** |
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* Get total cost of all items (VAT included) |
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*/ |
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public function getTotalCost(): Amount |
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{ |
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return $this->getTotalVatCost()->add($this->getTotalUnitCost()); |
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} |
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/** |
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* Get charged vat amounts for non-zero vat rates |
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* |
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* @return Amount[] |
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*/ |
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public function getVatRates(): array |
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{ |
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$rates = []; |
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foreach ($this as $envelope) { |
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if ($envelope->getVatRate() <= 0) { |
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continue; |
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} |
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if (!isset($rates[$envelope->getVatRate()])) { |
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$rates[$envelope->getVatRate()] = $this->createCurrencyObject('0'); |
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} |
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$rates[$envelope->getVatRate()] = $rates[$envelope->getVatRate()]->add($envelope->getTotalVatCost()); |
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} |
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ksort($rates); |
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return $rates; |
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} |
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/** |
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* Reduce loaded items to single amount using envelope method |
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*/ |
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private function reduce(string $method): Amount |
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{ |
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return array_reduce( |
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$this->getItems(), |
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function (Amount $carry, ItemEnvelope $envelope) use ($method) { |
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return $carry->add($envelope->$method()); |
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}, |
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$this->createCurrencyObject('0') |
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); |
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} |
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} |
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181
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byrokrat /
billing
