<?php
/*                                                                              
    Couffin - A simple PHP shopping basket.                                    
                                                                              
    Copyright 2005 by Georges Auberger                                            
	http://www.auberger.com/couffin
                                                                                                                                                           
    Couffin is free software; you can redistribute it and/or modify               
    it under the terms of the GNU General Public License as published by      
    the Free Software Foundation; either version 2 of the License, or         
    (at your option) any later version.                                       
                                                                              
    Couffin is distributed in the hope that it will be useful,                    
    but WITHOUT ANY WARRANTY; without even the implied warranty of            
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              
    GNU General Public License for more details.                              
                                                                                                                                                            
    You should have received a copy of the GNU General Public License         
    along with this program; if not, you can find it here:                    
    http://www.gnu.org/copyleft/gpl.html                                      
*/
class invoice {
	var $customer;
	var $shippingAddress;	
	var $cart;
	var $shipToBillingAddress;
	var $dateCreated;
	var $orderNumber;
	
	var $taxManager;
	var $shippingManager;

	function invoice($taxManager, $shippingManager) {
		$this->customer = new customer;
		$this->cart = new cart;
		$this->shippingAddress = new address;
		$this->dateCreated = time();
		$this->newOrderNumber();
		$this->shipToBillingAddress=true;
		$this->shippingAddress->country="USA";
		$this->taxManager = $taxManager;
		$this->shippingManager = $shippingManager;
	}

	function generateOrderNumber() {
		$filename = "invoice-sequence";
		$handle=fopen($filename,'r');
		$sequence=fgets($handle);
		$sequence = ($sequence == 0) ? 100 : $sequence+1;
		fclose($handle);
		$handle=fopen($filename,'w');
		fwrite($handle,$sequence);
		fclose($handle);
		return $sequence;
	}
	
	function getDateCreated() {
		return date("m/d/Y", $this->dateCreated);
	}

	function getSubTotal() {
		return $this->cart->getTotalPrice();
	}
	
	function getTotal() {
		return $this->cart->getTotalPrice() + $this->getTaxAmount() + $this->getShippingAmount();
	}
	
	function getTaxAmount() {
		return $this->cart->getTotalPrice() * $this->getTaxRate();	
	}

	function getShippingAmount() {
		return $this->shippingManager->computeShipping($this->cart->getTotalWeight());
	}
	
	function getTaxRate() {
		return $this->taxManager->getTaxRate($this->customer->billingAddress->state);
	}
	
	function getShippingMethod() {
		return $this->shippingManager->getShippingMethod();
	}

	function validate() {
		return $this->customer->validate() && $this->shippingAddress->validate();
	}
	
	function newOrderNumber() {
		$this->orderNumber = $this->generateOrderNumber();	
	}
	
}
?>