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<?php
declare(strict_types=1);
namespace Money;
use InvalidArgumentException;
use JsonSerializable;
use Money\Calculator\BcMathCalculator;
use function array_fill;
use function array_keys;
use function array_map;
use function array_sum;
use function count;
use function filter_var;
use function floor;
use function is_int;
use function max;
use function str_pad;
use function strlen;
use function substr;
use const FILTER_VALIDATE_INT;
use const PHP_ROUND_HALF_DOWN;
use const PHP_ROUND_HALF_EVEN;
use const PHP_ROUND_HALF_ODD;
use const PHP_ROUND_HALF_UP;
/**
* Money Value Object.
*
* @psalm-immutable
*/
final class Money implements JsonSerializable
{
use MoneyFactory;
public const ROUND_HALF_UP = PHP_ROUND_HALF_UP;
public const ROUND_HALF_DOWN = PHP_ROUND_HALF_DOWN;
public const ROUND_HALF_EVEN = PHP_ROUND_HALF_EVEN;
public const ROUND_HALF_ODD = PHP_ROUND_HALF_ODD;
public const ROUND_UP = 5;
public const ROUND_DOWN = 6;
public const ROUND_HALF_POSITIVE_INFINITY = 7;
public const ROUND_HALF_NEGATIVE_INFINITY = 8;
/**
* Internal value.
*
* @psalm-var numeric-string
*/
private string $amount;
private Currency $currency;
/**
* @var Calculator
* @psalm-var class-string<Calculator>
*/
private static string $calculator = BcMathCalculator::class;
/**
* @param int|string $amount Amount, expressed in the smallest units of $currency (eg cents)
* @psalm-param int|numeric-string $amount
*
* @throws InvalidArgumentException If amount is not integer(ish).
*/
public function __construct(int|string $amount, Currency $currency)
{
$this->currency = $currency;
if (filter_var($amount, FILTER_VALIDATE_INT) === false) {
$numberFromString = Number::fromString((string) $amount);
if (! $numberFromString->isInteger()) {
throw new InvalidArgumentException('Amount must be an integer(ish) value');
}
$this->amount = $numberFromString->getIntegerPart();
return;
}
$this->amount = (string) $amount;
}
/**
* Checks whether a Money has the same Currency as this.
*/
public function isSameCurrency(Money ...$others): bool
{
foreach ($others as $other) {
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $other->currency) {
return false;
}
}
return true;
}
/**
* Checks whether the value represented by this object equals to the other.
*/
public function equals(Money $other): bool
{
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $other->currency) {
return false;
}
if ($this->amount === $other->amount) {
return true;
}
// @TODO do we want Money instance to be byte-equivalent when trailing zeroes exist? Very expensive!
// Assumption: Money#equals() is called **less** than other number-based comparisons, and probably
// only within test suites. Therefore, using complex normalization here is acceptable waste of performance.
return $this->compare($other) === 0;
}
/**
* Returns an integer less than, equal to, or greater than zero
* if the value of this object is considered to be respectively
* less than, equal to, or greater than the other.
*/
public function compare(Money $other): int
{
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $other->currency) {
throw new InvalidArgumentException('Currencies must be identical');
}
return self::$calculator::compare($this->amount, $other->amount);
}
/**
* Checks whether the value represented by this object is greater than the other.
*/
public function greaterThan(Money $other): bool
{
return $this->compare($other) > 0;
}
public function greaterThanOrEqual(Money $other): bool
{
return $this->compare($other) >= 0;
}
/**
* Checks whether the value represented by this object is less than the other.
*/
public function lessThan(Money $other): bool
{
return $this->compare($other) < 0;
}
public function lessThanOrEqual(Money $other): bool
{
return $this->compare($other) <= 0;
}
/**
* Returns the value represented by this object.
*
* @psalm-return numeric-string
*/
public function getAmount(): string
{
return $this->amount;
}
/**
* Returns the currency of this object.
*/
public function getCurrency(): Currency
{
return $this->currency;
}
/**
* Returns a new Money object that represents
* the sum of this and an other Money object.
*
* @param Money[] $addends
*/
public function add(Money ...$addends): Money
{
$amount = $this->amount;
foreach ($addends as $addend) {
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $addend->currency) {
throw new InvalidArgumentException('Currencies must be identical');
}
$amount = self::$calculator::add($amount, $addend->amount);
}
return new self($amount, $this->currency);
}
/**
* Returns a new Money object that represents
* the difference of this and an other Money object.
*
* @param Money[] $subtrahends
*
* @psalm-pure
*/
public function subtract(Money ...$subtrahends): Money
{
$amount = $this->amount;
foreach ($subtrahends as $subtrahend) {
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $subtrahend->currency) {
throw new InvalidArgumentException('Currencies must be identical');
}
$amount = self::$calculator::subtract($amount, $subtrahend->amount);
}
return new self($amount, $this->currency);
}
/**
* Returns a new Money object that represents
* the multiplied value by the given factor.
*
* @psalm-param int|numeric-string $multiplier
* @psalm-param self::ROUND_* $roundingMode
*/
public function multiply(int|string $multiplier, int $roundingMode = self::ROUND_HALF_UP): Money
{
if (is_int($multiplier)) {
$multiplier = (string) $multiplier;
}
$product = $this->round(self::$calculator::multiply($this->amount, $multiplier), $roundingMode);
return new self($product, $this->currency);
}
/**
* Returns a new Money object that represents
* the divided value by the given factor.
*
* @psalm-param int|numeric-string $divisor
* @psalm-param self::ROUND_* $roundingMode
*/
public function divide(int|string $divisor, int $roundingMode = self::ROUND_HALF_UP): Money
{
if (is_int($divisor)) {
$divisor = (string) $divisor;
}
$quotient = $this->round(self::$calculator::divide($this->amount, $divisor), $roundingMode);
return new self($quotient, $this->currency);
}
/**
* Returns a new Money object that represents
* the remainder after dividing the value by
* the given factor.
*/
public function mod(Money $divisor): Money
{
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $divisor->currency) {
throw new InvalidArgumentException('Currencies must be identical');
}
return new self(self::$calculator::mod($this->amount, $divisor->amount), $this->currency);
}
/**
* Allocate the money according to a list of ratios.
*
* @psalm-param TRatios $ratios
*
* @return Money[]
* @psalm-return (
* TRatios is list
* ? non-empty-list<Money>
* : non-empty-array<Money>
* )
*
* @template TRatios as non-empty-array<float|int>
*/
public function allocate(array $ratios): array
{
$remainder = $this->amount;
$results = [];
$total = array_sum($ratios);
if ($total <= 0) {
throw new InvalidArgumentException('Cannot allocate to none, sum of ratios must be greater than zero');
}
foreach ($ratios as $key => $ratio) {
if ($ratio < 0) {
throw new InvalidArgumentException('Cannot allocate to none, ratio must be zero or positive');
}
$share = self::$calculator::share($this->amount, (string) $ratio, (string) $total);
$results[$key] = new self($share, $this->currency);
$remainder = self::$calculator::subtract($remainder, $share);
}
if (self::$calculator::compare($remainder, '0') === 0) {
return $results;
}
$amount = $this->amount;
$fractions = array_map(static function (float|int $ratio) use ($total, $amount) {
$share = (float) $ratio / $total * (float) $amount;
return $share - floor($share);
}, $ratios);
while (self::$calculator::compare($remainder, '0') > 0) {
$index = $fractions !== [] ? array_keys($fractions, max($fractions))[0] : 0;
$results[$index] = new self(self::$calculator::add($results[$index]->amount, '1'), $results[$index]->currency);
$remainder = self::$calculator::subtract($remainder, '1');
unset($fractions[$index]);
}
return $results;
}
/**
* Allocate the money among N targets.
*
* @psalm-param positive-int $n
*
* @return Money[]
* @psalm-return non-empty-list<Money>
*
* @throws InvalidArgumentException If number of targets is not an integer.
*/
public function allocateTo(int $n): array
{
return $this->allocate(array_fill(0, $n, 1));
}
/**
* @psalm-return numeric-string
*
* @throws InvalidArgumentException if the given $money is zero.
*/
public function ratioOf(Money $money): string
{
if ($money->isZero()) {
throw new InvalidArgumentException('Cannot calculate a ratio of zero');
}
// Note: non-strict equality is intentional here, since `Currency` is `final` and reliable.
if ($this->currency != $money->currency) {
throw new InvalidArgumentException('Currencies must be identical');
}
return self::$calculator::divide($this->amount, $money->amount);
}
/**
* @psalm-param numeric-string $amount
* @psalm-param self::ROUND_* $roundingMode
*
* @psalm-return numeric-string
*/
private function round(string $amount, int $roundingMode): string
{
if ($roundingMode === self::ROUND_UP) {
return self::$calculator::ceil($amount);
}
if ($roundingMode === self::ROUND_DOWN) {
return self::$calculator::floor($amount);
}
return self::$calculator::round($amount, $roundingMode);
}
/**
* Round to a specific unit.
*
* @psalm-param positive-int|0 $unit
* @psalm-param self::ROUND_* $roundingMode
*/
public function roundToUnit(int $unit, int $roundingMode = self::ROUND_HALF_UP): self
{
if ($unit === 0) {
return $this;
}
$abs = self::$calculator::absolute($this->amount);
if (strlen($abs) < $unit) {
return new self('0', $this->currency);
}
/** @psalm-var numeric-string $toBeRounded */
$toBeRounded = substr($this->amount, 0, strlen($this->amount) - $unit) . '.' . substr($this->amount, $unit * -1);
$result = $this->round($toBeRounded, $roundingMode);
if ($result !== '0') {
$result .= str_pad('', $unit, '0');
}
/** @psalm-var numeric-string $result */
return new self($result, $this->currency);
}
public function absolute(): Money
{
return new self(
self::$calculator::absolute($this->amount),
$this->currency
);
}
public function negative(): Money
{
return (new self(0, $this->currency))
->subtract($this);
}
/**
* Checks if the value represented by this object is zero.
*/
public function isZero(): bool
{
return self::$calculator::compare($this->amount, '0') === 0;
}
/**
* Checks if the value represented by this object is positive.
*/
public function isPositive(): bool
{
return self::$calculator::compare($this->amount, '0') > 0;
}
/**
* Checks if the value represented by this object is negative.
*/
public function isNegative(): bool
{
return self::$calculator::compare($this->amount, '0') < 0;
}
/**
* {@inheritdoc}
*
* @psalm-return array{amount: string, currency: string}
*/
public function jsonSerialize(): array
{
return [
'amount' => $this->amount,
'currency' => $this->currency->jsonSerialize(),
];
}
/**
* @param Money $first
* @param Money ...$collection
*
* @psalm-pure
*/
public static function min(self $first, self ...$collection): Money
{
$min = $first;
foreach ($collection as $money) {
if (! $money->lessThan($min)) {
continue;
}
$min = $money;
}
return $min;
}
/**
* @param Money $first
* @param Money ...$collection
*
* @psalm-pure
*/
public static function max(self $first, self ...$collection): Money
{
$max = $first;
foreach ($collection as $money) {
if (! $money->greaterThan($max)) {
continue;
}
$max = $money;
}
return $max;
}
/** @psalm-pure */
public static function sum(self $first, self ...$collection): Money
{
return $first->add(...$collection);
}
/** @psalm-pure */
public static function avg(self $first, self ...$collection): Money
{
return $first->add(...$collection)->divide((string) (count($collection) + 1));
}
/** @psalm-param class-string<Calculator> $calculator */
public static function registerCalculator(string $calculator): void
{
self::$calculator = $calculator;
}
/** @psalm-return class-string<Calculator> */
public static function getCalculator(): string
{
return self::$calculator;
}
}