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<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Shopping Cart Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Shopping Cart
 * @author		EllisLab Dev Team
 * @link		https://codeigniter.com/user_guide/libraries/cart.html
 * @deprecated	3.0.0	This class is too specific for CI.
 */
class CI_Cart {

/**
	 * These are the regular expression rules that we use to validate the product ID and product name
	 * alpha-numeric, dashes, underscores, or periods
	 *
	 * @var string
	 */
	public $product_id_rules = '\.a-z0-9_-';

/**
	 * These are the regular expression rules that we use to validate the product ID and product name
	 * alpha-numeric, dashes, underscores, colons or periods
	 *
	 * @var string
	 */
	public $product_name_rules = '\w \-\.\:';

/**
	 * only allow safe product names
	 *
	 * @var bool
	 */
	public $product_name_safe = TRUE;

/**
	 * Reference to CodeIgniter instance
	 *
	 * @var object
	 */
	protected $CI;

/**
	 * Contents of the cart
	 *
	 * @var array
	 */
	protected $_cart_contents = array();

/**
	 * Shopping Class Constructor
	 *
	 * The constructor loads the Session class, used to store the shopping cart contents.
	 *
	 * @param	array
	 * @return	void
	 */
	public function __construct($params = array())
	{
				$this->CI =& get_instance();

$config = is_array($params) ? $params : array();

$this->CI->load->driver('session', $config);

$this->_cart_contents = $this->CI->session->userdata('cart_contents');
		if ($this->_cart_contents === NULL)
		{
						$this->_cart_contents = array('cart_total' => 0, 'total_items' => 0);
		}

log_message('info', 'Cart Class Initialized');
	}

/**
	 * Insert items into the cart and save it to the session table
	 *
	 * @param	array
	 * @return	bool
	 */
	public function insert($items = array())
	{
				if ( ! is_array($items) OR count($items) === 0)
		{
			log_message('error', 'The insert method must be passed an array containing data.');
			return FALSE;
		}

$save_cart = FALSE;
		if (isset($items['id']))
		{
			if (($rowid = $this->_insert($items)))
			{
				$save_cart = TRUE;
			}
		}
		else
		{
			foreach ($items as $val)
			{
				if (is_array($val) && isset($val['id']))
				{
					if ($this->_insert($val))
					{
						$save_cart = TRUE;
					}
				}
			}
		}

if ($save_cart === TRUE)
		{
			$this->_save_cart();
			return isset($rowid) ? $rowid : TRUE;
		}

return FALSE;
	}

/**
	 * Insert
	 *
	 * @param	array
	 * @return	bool
	 */
	protected function _insert($items = array())
	{
				if ( ! is_array($items) OR count($items) === 0)
		{
			log_message('error', 'The insert method must be passed an array containing data.');
			return FALSE;
		}

if ( ! isset($items['id'], $items['qty'], $items['price'], $items['name']))
		{
			log_message('error', 'The cart array must contain a product ID, quantity, price, and name.');
			return FALSE;
		}

$items['qty'] = (float) $items['qty'];

if ($items['qty'] == 0)
		{
			return FALSE;
		}

if ( ! preg_match('/^['.$this->product_id_rules.']+$/i', $items['id']))
		{
			log_message('error', 'Invalid product ID.  The product ID can only contain alpha-numeric characters, dashes, and underscores');
			return FALSE;
		}

if ($this->product_name_safe && ! preg_match('/^['.$this->product_name_rules.']+$/i'.(UTF8_ENABLED ? 'u' : ''), $items['name']))
		{
			log_message('error', 'An invalid name was submitted as the product name: '.$items['name'].' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces');
			return FALSE;
		}

$items['price'] = (float) $items['price'];

if (isset($items['options']) && count($items['options']) > 0)
		{
			$rowid = md5($items['id'].serialize($items['options']));
		}
		else
		{
												$rowid = md5($items['id']);
		}

$old_quantity = isset($this->_cart_contents[$rowid]['qty']) ? (int) $this->_cart_contents[$rowid]['qty'] : 0;

$items['rowid'] = $rowid;
		$items['qty'] += $old_quantity;
		$this->_cart_contents[$rowid] = $items;

return $rowid;
	}

/**
	 * Update the cart
	 *
	 * This function permits the quantity of a given item to be changed.
	 * Typically it is called from the "view cart" page if a user makes
	 * changes to the quantity before checkout. That array must contain the
	 * product ID and quantity for each item.
	 *
	 * @param	array
	 * @return	bool
	 */
	public function update($items = array())
	{
				if ( ! is_array($items) OR count($items) === 0)
		{
			return FALSE;
		}

$save_cart = FALSE;
		if (isset($items['rowid']))
		{
			if ($this->_update($items) === TRUE)
			{
				$save_cart = TRUE;
			}
		}
		else
		{
			foreach ($items as $val)
			{
				if (is_array($val) && isset($val['rowid']))
				{
					if ($this->_update($val) === TRUE)
					{
						$save_cart = TRUE;
					}
				}
			}
		}

if ($save_cart === TRUE)
		{
			$this->_save_cart();
			return TRUE;
		}

return FALSE;
	}

/**
	 * Update the cart
	 *
	 * This function permits changing item properties.
	 * Typically it is called from the "view cart" page if a user makes
	 * changes to the quantity before checkout. That array must contain the
	 * rowid and quantity for each item.
	 *
	 * @param	array
	 * @return	bool
	 */
	protected function _update($items = array())
	{
				if ( ! isset($items['rowid'], $this->_cart_contents[$items['rowid']]))
		{
			return FALSE;
		}

if (isset($items['qty']))
		{
			$items['qty'] = (float) $items['qty'];
									if ($items['qty'] == 0)
			{
				unset($this->_cart_contents[$items['rowid']]);
				return TRUE;
			}
		}

$keys = array_intersect(array_keys($this->_cart_contents[$items['rowid']]), array_keys($items));
				if (isset($items['price']))
		{
			$items['price'] = (float) $items['price'];
		}

foreach (array_diff($keys, array('id', 'name')) as $key)
		{
			$this->_cart_contents[$items['rowid']][$key] = $items[$key];
		}

return TRUE;
	}

/**
	 * Save the cart array to the session DB
	 *
	 * @return	bool
	 */
	protected function _save_cart()
	{
				$this->_cart_contents['total_items'] = $this->_cart_contents['cart_total'] = 0;
		foreach ($this->_cart_contents as $key => $val)
		{
						if ( ! is_array($val) OR ! isset($val['price'], $val['qty']))
			{
				continue;
			}

$this->_cart_contents['cart_total'] += ($val['price'] * $val['qty']);
			$this->_cart_contents['total_items'] += $val['qty'];
			$this->_cart_contents[$key]['subtotal'] = ($this->_cart_contents[$key]['price'] * $this->_cart_contents[$key]['qty']);
		}

if (count($this->_cart_contents) <= 2)
		{
			$this->CI->session->unset_userdata('cart_contents');

return FALSE;
		}

$this->CI->session->set_userdata(array('cart_contents' => $this->_cart_contents));

return TRUE;
	}

/**
	 * Cart Total
	 *
	 * @return	int
	 */
	public function total()
	{
		return $this->_cart_contents['cart_total'];
	}

/**
	 * Remove Item
	 *
	 * Removes an item from the cart
	 *
	 * @param	int
	 * @return	bool
	 */
	 public function remove($rowid)
	 {
				unset($this->_cart_contents[$rowid]);
		$this->_save_cart();
		return TRUE;
	 }

/**
	 * Total Items
	 *
	 * Returns the total item count
	 *
	 * @return	int
	 */
	public function total_items()
	{
		return $this->_cart_contents['total_items'];
	}

/**
	 * Cart Contents
	 *
	 * Returns the entire cart array
	 *
	 * @param	bool
	 * @return	array
	 */
	public function contents($newest_first = FALSE)
	{
				$cart = ($newest_first) ? array_reverse($this->_cart_contents) : $this->_cart_contents;

unset($cart['total_items']);
		unset($cart['cart_total']);

return $cart;
	}

/**
	 * Get cart item
	 *
	 * Returns the details of a specific item in the cart
	 *
	 * @param	string	$row_id
	 * @return	array
	 */
	public function get_item($row_id)
	{
		return (in_array($row_id, array('total_items', 'cart_total'), TRUE) OR ! isset($this->_cart_contents[$row_id]))
			? FALSE
			: $this->_cart_contents[$row_id];
	}

/**
	 * Has options
	 *
	 * Returns TRUE if the rowid passed to this function correlates to an item
	 * that has options associated with it.
	 *
	 * @param	string	$row_id = ''
	 * @return	bool
	 */
	public function has_options($row_id = '')
	{
		return (isset($this->_cart_contents[$row_id]['options']) && count($this->_cart_contents[$row_id]['options']) !== 0);
	}

/**
	 * Product options
	 *
	 * Returns the an array of options, for a particular product row ID
	 *
	 * @param	string	$row_id = ''
	 * @return	array
	 */
	public function product_options($row_id = '')
	{
		return isset($this->_cart_contents[$row_id]['options']) ? $this->_cart_contents[$row_id]['options'] : array();
	}

/**
	 * Format Number
	 *
	 * Returns the supplied number with commas and a decimal point.
	 *
	 * @param	float
	 * @return	string
	 */
	public function format_number($n = '')
	{
		return ($n === '') ? '' : number_format( (float) $n, 2, '.', ',');
	}

/**
	 * Destroy the cart
	 *
	 * Empties the cart and kills the session
	 *
	 * @return	void
	 */
	public function destroy()
	{
		$this->_cart_contents = array('cart_total' => 0, 'total_items' => 0);
		$this->CI->session->unset_userdata('cart_contents');
	}

}