<?php

namespace Give\ValueObjects;

/**
 * Class Money
 * @package Give\ValueObjects
 *
 * @since 2.9.0
 * @since 2.11.0 Refactored to make the minor amount the base.
 */
class Money {
	/**
	 * The amount in smallest unit of currency.
	 * @var int
	 */
	protected $minorAmount;

	/**
	 * @var array
	 */
	protected $currencyData;

	/**
	 * Money constructor.
	 * @param int $minorAmount
	 * @param array $currencyData
	 */
	public function __construct( $minorAmount, $currencyData ) {
		$this->minorAmount  = $minorAmount;
		$this->currencyData = $currencyData;
	}

	/**
	 * Get amount in smallest unit of currency.
	 *
	 * @sicne 2.9.0
	 * @since 2.11.0 Round minor amount to account for floating point precision.
	 *
	 * @return int
	 */
	public function getMinorAmount() {
		return $this->minorAmount;
	}

	/**
	 * Get amount in smallest unit of currency.
	 *
	 * @sicne 2.9.0
	 *
	 * @return string
	 */
	public function getAmount() {
		if ( $this->currencyData['setting']['number_decimals'] ) {
			return $this->minorAmount / ( 10 ** $this->currencyData['setting']['number_decimals'] );
		}
		return $this->minorAmount;
	}

	// Static Methods and Factories

	/**
	 * @since 2.9.0
	 * @since 2.11.0 Converts the amount to a minor amount when creating an instance.
	 *
	 * @param int|string $amount Amount value without currency formatting
	 * @param string     $currency
	 *
	 * @return Money
	 */
	public static function of( $amount, $currency ) {

		$currencyData = self::getCurrencyData( $currency );

		/**
		 * When working with float values, be careful when casting to an integer.
		 * Due to "floating point precision", the output may not match the expected value.
		 *
		 * @link https://www.php.net/manual/en/language.types.float.php
		 *  This can lead to confusing results:
		 *      for example, floor((0.1+0.7)*10) will usually return 7 instead of the expected 8,
		 *      since the internal representation will be something like 7.9999999999999991118....
		 */
		$amount = absint(
			round( $amount * ( 10 ** $currencyData['setting']['number_decimals'] ) )
		);

		return new static( $amount, $currencyData );
	}

	/**
	 * @since 2.9.0
	 *
	 * @param int|string $minorAmount
	 * @param string     $currency
	 *
	 * @return Money
	 */
	public static function ofMinor( $minorAmount, $currency ) {
		return new static( $minorAmount, self::getCurrencyData( $currency ) );
	}

	/**
	 * Retrieves the currency data for a given currency with some optimizations to avoid loading all the currencies more
	 * than once.
	 *
	 * @since 2.9.0
	 *
	 * @param $currency
	 *
	 * @return array
	 */
	private static function getCurrencyData( $currency ) {
		static $currenciesData = null;

		if ( $currenciesData === null ) {
			$currenciesData = give_get_currencies( 'all' );
		}

		return $currenciesData[ $currency ];
	}
}