<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

/**
 * Receiving library
 *
 * Library with utilities to manage receivings
 */

class Receiving_lib
{
	private $CI;

	public function __construct()
	{
		$this->CI =& get_instance();
	}

	public function get_cart()
	{
		if(!$this->CI->session->userdata('recv_cart'))
		{
			$this->set_cart(array());
		}

		return $this->CI->session->userdata('recv_cart');
	}

	public function set_cart($cart_data)
	{
		$this->CI->session->set_userdata('recv_cart', $cart_data);
	}

	public function empty_cart()
	{
		$this->CI->session->unset_userdata('recv_cart');
	}

	public function get_supplier()
	{
		if(!$this->CI->session->userdata('recv_supplier'))
		{
			$this->set_supplier(-1);
		}

		return $this->CI->session->userdata('recv_supplier');
	}

	public function set_supplier($supplier_id)
	{
		$this->CI->session->set_userdata('recv_supplier', $supplier_id);
	}

	public function remove_supplier()
	{
		$this->CI->session->unset_userdata('recv_supplier');
	}

	public function get_mode()
	{
		if(!$this->CI->session->userdata('recv_mode'))
		{
			$this->set_mode('receive');
		}

		return $this->CI->session->userdata('recv_mode');
	}

	public function set_mode($mode)
	{
		$this->CI->session->set_userdata('recv_mode', $mode);
	}
	
	public function clear_mode()
	{
		$this->CI->session->unset_userdata('recv_mode');
	}

	public function get_stock_source()
	{
		if(!$this->CI->session->userdata('recv_stock_source'))
		{
			$this->set_stock_source($this->CI->Stock_location->get_default_location_id());
		}

		return $this->CI->session->userdata('recv_stock_source');
	}
	
	public function get_comment()
	{
		// avoid returning a NULL that results in a 0 in the comment if nothing is set/available
		$comment = $this->CI->session->userdata('recv_comment');

		return empty($comment) ? '' : $comment;
	}
	
	public function set_comment($comment)
	{
		$this->CI->session->set_userdata('recv_comment', $comment);
	}
	
	public function clear_comment()
	{
		$this->CI->session->unset_userdata('recv_comment');
	}
   
	public function get_reference()
	{
		return $this->CI->session->userdata('recv_reference');
	}
	
	public function set_reference($reference)
	{
		$this->CI->session->set_userdata('recv_reference', $reference);
	}
	
	public function clear_reference()
	{
		$this->CI->session->unset_userdata('recv_reference');
	}
	
	public function is_print_after_sale()
	{
		return $this->CI->session->userdata('recv_print_after_sale') == 'true' ||
				$this->CI->session->userdata('recv_print_after_sale') == '1';
	}
	
	public function set_print_after_sale($print_after_sale)
	{
		return $this->CI->session->set_userdata('recv_print_after_sale', $print_after_sale);
	}
	
	public function set_stock_source($stock_source)
	{
		$this->CI->session->set_userdata('recv_stock_source', $stock_source);
	}
	
	public function clear_stock_source()
	{
		$this->CI->session->unset_userdata('recv_stock_source');
	}
	
	public function get_stock_destination()
	{
		if(!$this->CI->session->userdata('recv_stock_destination'))
		{
			$this->set_stock_destination($this->CI->Stock_location->get_default_location_id());
		}

		return $this->CI->session->userdata('recv_stock_destination');
	}

	public function set_stock_destination($stock_destination)
	{
		$this->CI->session->set_userdata('recv_stock_destination', $stock_destination);
	}
	
	public function clear_stock_destination()
	{
		$this->CI->session->unset_userdata('recv_stock_destination');
	}

	public function add_item($item_id, $quantity = 1, $item_location = NULL, $discount = 0, $price = NULL, $description = NULL, $serialnumber = NULL, $receiving_quantity = NULL, $include_deleted = FALSE)
	{
		//make sure item exists in database.
		if(!$this->CI->Item->exists($item_id, $include_deleted))
		{
			//try to get item id given an item_number
			$item_id = $this->CI->Item->get_item_id($item_id, $include_deleted);

			if(!$item_id)
			{
				return FALSE;
			}
		}

		//Get items in the receiving so far.
		$items = $this->get_cart();

		//We need to loop through all items in the cart.
		//If the item is already there, get it's key($updatekey).
		//We also need to get the next key that we are going to use in case we need to add the
		//item to the list. Since items can be deleted, we can't use a count. we use the highest key + 1.

		$maxkey = 0;					//Highest key so far
		$itemalreadyinsale = FALSE;		//We did not find the item yet.
		$insertkey = 0;					//Key to use for new entry.
		$updatekey = 0;					//Key to use to update(quantity)

		foreach($items as $item)
		{
			//We primed the loop so maxkey is 0 the first time.
			//Also, we have stored the key in the element itself so we can compare.
			//There is an array public function to get the associated key for an element, but I like it better
			//like that!

			if($maxkey <= $item['line'])
			{
				$maxkey = $item['line'];
			}

			if($item['item_id'] == $item_id && $item['item_location'] == $item_location)
			{
				$itemalreadyinsale = TRUE;
				$updatekey = $item['line'];
			}
		}

		$insertkey = $maxkey+1;
		$item_info = $this->CI->Item->get_info($item_id,$item_location);
		//array records are identified by $insertkey and item_id is just another field.
		$price = $price != NULL ? $price : $item_info->cost_price;
		$item = array($insertkey => array(
				'item_id' => $item_id,
				'item_location' => $item_location,
				'stock_name' => $this->CI->Stock_location->get_location_name($item_location),
				'line' => $insertkey,
				'name' => $item_info->name,
				'description' => $description != NULL ? $description: $item_info->description,
				'serialnumber' => $serialnumber != NULL ? $serialnumber: '',
				'allow_alt_description' => $item_info->allow_alt_description,
				'is_serialized' => $item_info->is_serialized,
				'quantity' => $quantity,
				'discount' => $discount,
				'in_stock' => $this->CI->Item_quantity->get_item_quantity($item_id, $item_location)->quantity,
				'price' => $price,
				'receiving_quantity' => $receiving_quantity!=NULL ? $receiving_quantity : $item_info->receiving_quantity,
				'total' => $this->get_item_total($quantity, $price, $discount, $receiving_quantity)
			)
		);

		//Item already exists
		if($itemalreadyinsale)
		{
			$items[$updatekey]['quantity'] += $quantity;
			$items[$updatekey]['total'] = $this->get_item_total($items[$updatekey]['quantity'], $price, $discount);
		}
		else
		{
			//add to existing array
			$items += $item;
		}

		$this->set_cart($items);

		return TRUE;
	}

	public function edit_item($line, $description, $serialnumber, $quantity, $discount, $price)
	{
		$items = $this->get_cart();
		if(isset($items[$line]))
		{
			$line = &$items[$line];
			$line['description'] = $description;
			$line['serialnumber'] = $serialnumber;
			$line['quantity'] = $quantity;
			$line['discount'] = $discount;
			$line['price'] = $price;
			$line['total'] = $this->get_item_total($quantity, $price, $discount); 
			$this->set_cart($items);
		}

		return FALSE;
	}

	public function delete_item($line)
	{
		$items = $this->get_cart();
		unset($items[$line]);
		$this->set_cart($items);
	}

	public function return_entire_receiving($receipt_receiving_id)
	{
		//RECV #
		$pieces = explode(' ', $receipt_receiving_id);
		if(preg_match("/(RECV|KIT)/", $pieces[0]))
		{
			$receiving_id = $pieces[1];
		} 
		else 
		{
			$receiving_id = $this->CI->Receiving->get_receiving_by_reference($receipt_receiving_id)->row()->receiving_id;
		}

		$this->empty_cart();
		$this->remove_supplier();
		$this->clear_comment();

		foreach($this->CI->Receiving->get_receiving_items($receiving_id)->result() as $row)
		{
			$this->add_item($row->item_id, -$row->quantity_purchased, $row->item_location, $row->discount_percent, $row->item_unit_price, $row->description, $row->serialnumber, $row->receiving_quantity, TRUE);
		}

		$this->set_supplier($this->CI->Receiving->get_supplier($receiving_id)->person_id);
	}

	public function add_item_kit($external_item_kit_id, $item_location)
	{
		//KIT #
		$pieces = explode(' ',$external_item_kit_id);
		$item_kit_id = $pieces[1];
		
		foreach($this->CI->Item_kit_items->get_info($item_kit_id) as $item_kit_item)
		{
			$this->add_item($item_kit_item['item_id'],$item_kit_item['quantity'], $item_location);
		}
	}

	public function copy_entire_receiving($receiving_id)
	{
		$this->empty_cart();
		$this->remove_supplier();

		foreach($this->CI->Receiving->get_receiving_items($receiving_id)->result() as $row)
		{
			$this->add_item($row->item_id, $row->quantity_purchased, $row->item_location, $row->discount_percent, $row->item_unit_price, $row->description, $row->serialnumber, $row->receiving_quantity, TRUE);
		}

		$this->set_supplier($this->CI->Receiving->get_supplier($receiving_id)->person_id);
		//$this->set_reference($this->CI->Receiving->get_info($receiving_id)->row()->reference);
	}

	public function clear_all()
	{
		$this->clear_mode();
		$this->empty_cart();
		$this->remove_supplier();
		$this->clear_comment();
		$this->clear_reference();
	}

	public function get_item_total($quantity, $price, $discount_percentage)
	{
		$total = bcmul($quantity, $price);
		$discount_fraction = bcdiv($discount_percentage, 100);
		$discount_amount = bcmul($total, $discount_fraction);

		return bcsub($total, $discount_amount);
	}

	public function get_total()
	{
		$total = 0;
		foreach($this->get_cart() as $item)
		{
			$total = bcadd($total, $this->get_item_total(($item['quantity']* $item['receiving_quantity']), $item['price'], $item['discount']));
		}
		
		return $total;
	}
}

?>
