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

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)
            )
        );

        //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['price'], $item['discount']));
        }
        
        return $total;
    }
}

?>