Charge.php

<?php
/**
 * PHP Billing Library
 *
 * @link      https://github.com/hiqdev/php-billing
 * @package   php-billing
 * @license   BSD-3-Clause
 * @copyright Copyright (c) 2017-2020, HiQDev (http://hiqdev.com/)
 */

namespace hiqdev\php\billing\charge;

use hiqdev\php\billing\action\ActionInterface;
use hiqdev\php\billing\bill\BillInterface;
use hiqdev\php\billing\event\EventAwareTrait;
use hiqdev\php\billing\Exception\CannotReassignException;
use hiqdev\php\billing\price\PriceInterface;
use hiqdev\php\billing\target\TargetInterface;
use hiqdev\php\billing\type\TypeInterface;
use hiqdev\php\units\QuantityInterface;
use Money\Money;

/**
 * Charge.
 *
 * [[Action]] is charged with a number of [[Charge]]s.
 *
 * @author Andrii Vasyliev <sol@hiqdev.com>
 */
class Charge implements ChargeInterface
{
    use EventAwareTrait;

    /** @var int */
    protected $id;

    /** @var TypeInterface */
    protected $type;

    /** @var TargetInterface */
    protected $target;

    /** @var ActionInterface */
    protected $action;

    /** @var PriceInterface */
    protected $price;

    /** @var QuantityInterface */
    protected $usage;

    /** @var Money */
    protected $sum;

    /** @var BillInterface */
    protected $bill;

    /** @var ChargeState */
    protected $state;

    /** @var string */
    protected $comment;

    /** @var ChargeInterface|null */
    protected $parent;

    public function __construct(
                            $id,
        TypeInterface $type,
        TargetInterface $target,
        ActionInterface $action,
        ?PriceInterface $price,
        QuantityInterface $usage,
        Money $sum,
        BillInterface $bill = null
    ) {
        $this->id       = $id;
        $this->type     = $type;
        $this->target   = $target;
        $this->action   = $action;
        $this->price    = $price;
        $this->usage    = $usage;
        $this->sum      = $sum;
        $this->bill     = $bill;
    }

    /**
     * {@inheritdoc}
     */
    public function getUniqueString(): string
    {
        return implode('-', [
            'currency'  => $this->sum->getCurrency()->getCode(),
            'buyer'     => $this->action->getCustomer()->getUniqueId(),
            'target'    => $this->target->getUniqueId(),
            'type'      => $this->type->getUniqueId(),
            'time'      => $this->action->getTime()->format('c'),
            'parent'    => '(' . ($this->parent !== null ? $this->parent->getUniqueString() : null) . ')',
        ]);
    }

    public function hasId(): bool
    {
        return $this->id !== null;
    }

    public function getId()
    {
        return $this->id;
    }

    public function getType(): TypeInterface
    {
        return $this->type;
    }

    public function getTarget(): TargetInterface
    {
        return $this->target;
    }

    public function getAction(): ActionInterface
    {
        return $this->action;
    }

    public function getPrice(): ?PriceInterface
    {
        return $this->price;
    }

    public function getUsage(): QuantityInterface
    {
        return $this->usage;
    }

    public function getSum(): Money
    {
        return $this->sum;
    }

    public function calculatePrice(): Money
    {
        $usage = $this->usage->getQuantity();

        return $usage ? $this->sum->divide(sprintf('%.14F', $usage)) : $this->sum;
    }

    public function getBill(): ?BillInterface
    {
        return $this->bill;
    }

    public function hasBill()
    {
        return $this->bill !== null;
    }

    public function setBill(BillInterface $bill): ChargeInterface
    {
        /*if ($this->hasBill()) {
            throw new CannotReassignException('sale bill');
        }*/
        $this->bill = $bill;

        return $this;
    }

    public function getState(): ?ChargeState
    {
        return $this->state;
    }

    public function setFinished(): ChargeInterface
    {
        $this->state = ChargeState::finished();

        return $this;
    }

    public function isFinished(): ?bool
    {
        return $this->state === null ? null : $this->state->isFinished();
    }

    public function getComment(): ?string
    {
        return $this->comment;
    }

    public function setComment(string $comment): ChargeInterface
    {
        $this->comment = $comment;

        return $this;
    }

    public function setId($id): ChargeInterface
    {
        if ((string) $this->id === (string) $id) {
            return $this;
        }
        if ($this->id !== null) {
            throw new CannotReassignException('charge id');
        }
        $this->id = $id;

        return $this;
    }

    public function jsonSerialize(): array
    {
        return array_filter(get_object_vars($this));
    }

    public function getParent(): ?ChargeInterface
    {
        return $this->parent;
    }

    /**
     * @throws CannotReassignException if parent is already set
     */
    public function setParent(ChargeInterface $parent): self
    {
        if ($this->parent !== null) {
            throw new CannotReassignException('charge parent');
        }

        $this->parent = $parent;

        return $this;
    }

    /**
     * Forcefully changes parent charge
     */
    public function overwriteParent(?ChargeInterface $parent): ChargeInterface
    {
        $this->parent = $parent;

        return $this;
    }
}