<?php
/**
 * PHPUnit
 *
 * Copyright (c) 2002-2008, Sebastian Bergmann <sb@sebastian-bergmann.de>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Sebastian Bergmann nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @category   Testing
 * @package    PHPUnit
 * @author     Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @copyright  2002-2008 Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @version    SVN: $Id: MoneyBag.php 1985 2007-12-26 18:11:55Z sb $
 * @link       http://www.phpunit.de/
 * @since      File available since Release 2.3.0
 */

require_once 'IMoney.php';
require_once 'Money.php';

/**
 * A MoneyBag.
 *
 * @category   Testing
 * @package    PHPUnit
 * @author     Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @copyright  2002-2008 Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @version    Release: 3.2.9
 * @link       http://www.phpunit.de/
 * @since      Class available since Release 2.3.0
 */
class MoneyBag implements IMoney {
  protected $fMonies = array();

  public static function create(IMoney $m1, IMoney $m2) {
    $result = new MoneyBag();
    $m1->appendTo($result);
    $m2->appendTo($result);
    
    return $result->simplify();
  }

  public function add(IMoney $m) {
    return $m->addMoneyBag($this);
  }

  public function addMoney(Money $m) {
    return MoneyBag::create($m, $this);
  }

  public function addMoneyBag(MoneyBag $s) {
    return MoneyBag::create($s, $this);
  }

  public function appendBag(MoneyBag $aBag) {
    foreach ($aBag->monies() as $aMoney) {
      $this->appendMoney($aMoney);
    }
  }

  public function monies() {
    return $this->fMonies;
  }

  public function appendMoney(Money $aMoney) {
    if ($aMoney->isZero()) {
      return;
    }
    
    $old = $this->findMoney($aMoney->currency());
    
    if ($old == NULL) {
      $this->fMonies[] = $aMoney;
      return;
    }
    
    $keys = array_keys($this->fMonies);
    $max = count($keys);
    
    for ($i = 0; $i < $max; $i ++) {
      if ($this->fMonies[$keys[$i]] === $old) {
        unset($this->fMonies[$keys[$i]]);
        break;
      }
    }
    
    $sum = $old->add($aMoney);
    
    if ($sum->isZero()) {
      return;
    }
    
    $this->fMonies[] = $sum;
  }

  public function equals($anObject) {
    if ($this->isZero() && $anObject instanceof IMoney) {
      return $anObject->isZero();
    }
    
    if ($anObject instanceof MoneyBag) {
      if (count($anObject->monies()) != count($this->fMonies)) {
        return FALSE;
      }
      
      foreach ($this->fMonies as $m) {
        if (! $anObject->contains($m)) {
          return FALSE;
        }
      }
      
      return TRUE;
    }
    
    return FALSE;
  }

  protected function findMoney($currency) {
    foreach ($this->fMonies as $m) {
      if ($m->currency() == $currency) {
        return $m;
      }
    }
    
    return NULL;
  }

  protected function contains(Money $m) {
    $found = $this->findMoney($m->currency());
    
    if ($found == NULL) {
      return FALSE;
    }
    
    return $found->amount() == $m->amount();
  }

  public function hashCode() {
    $hash = 0;
    
    foreach ($this->fMonies as $m) {
      $hash ^= $m->hashCode();
    }
    
    return $hash;
  }

  public function isZero() {
    return count($this->fMonies) == 0;
  }

  public function multiply($factor) {
    $result = new MoneyBag();
    
    if ($factor != 0) {
      foreach ($this->fMonies as $m) {
        $result->appendMoney($m->multiply($factor));
      }
    }
    
    return $result;
  }

  public function negate() {
    $result = new MoneyBag();
    
    foreach ($this->fMonies as $m) {
      $result->appendMoney($m->negate());
    }
    
    return $result;
  }

  protected function simplify() {
    if (count($this->fMonies) == 1) {
      return array_pop($this->fMonies);
    }
    
    return $this;
  }

  public function subtract(IMoney $m) {
    return $this->add($m->negate());
  }

  public function toString() {
    $buffer = '{';
    
    foreach ($this->fMonies as $m) {
      $buffer .= $m->toString();
    }
    
    return $buffer . '}';
  }

  public function appendTo(MoneyBag $m) {
    $m->appendBag($this);
  }
}
?>
