<?php
namespace Omnipay\Common;

class Money {
  
  private $value;
  private $currencyCode;
  
  private function __construct ($value, $currencyCode) {
    $this->value = $value;
    $this->currencyCode = $currencyCode;
  }
  
  public function isCurrencyAvailableWithin(array $currencies) {
    return in_array($this->currencyCode, $currencies);
  }
  
  public function toInteger() {
    return $this->value;
  }
  
  public function toDecimalString() {
    return substr($value, 0, -2) . '.' . substr($value, -2);
  }
  
  public function toFloat() {
    return (float) $this->toDecimalString();
  }
  
  public static function fromInteger($amount, $currencyCode) {
    if (filter_var($amount, FILTER_VALIDATE_INT) === false) {
      throw new InvalidRequestException('Amount must be a valid integer');
    }
    
    return new self($amount, $currencyCode);
  }
  
  public static function fromFloat($amount, $currencyCode) {
    if (is_float($amount) === false) {
      throw new InvalidRequestException('Amount must be a floating point');
    }
    
    return new self(str_replace('.', '', sprintf('%.8g', $amount)), $currencyCode);
  }
  
  public static function fromDecimalString($amount, $currencyCode) {
    if (is_string($amount) === false || strpos($amount, '.') === false || filter_var(str_replace('.', '', $amount), FILTER_VALIDATE_INT) === false) {
      throw new InvalidRequestException('Amount must be a floating point');
    }
    
    return new self(str_replace('.', '', sprintf('%.8g', $amount)), $currencyCode);
  }
  
}