From 927dbbabb614412a655b0fdcdddbc24c2ddda5a0 Mon Sep 17 00:00:00 2001
From: Martes Erede <martes@posteo.net>
Date: Sat, 24 Jan 2015 21:40:07 +0100
Subject: [PATCH] Feature #27: Changing cost price while receiving items

---
 application/models/item.php                | 35 ++++++++++++++++++++++
 application/models/receiving.php           | 14 +++++++--
 application/views/receivings/receiving.php |  2 +-
 3 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/application/models/item.php b/application/models/item.php
index 134712eb4..7b18032fb 100644
--- a/application/models/item.php
+++ b/application/models/item.php
@@ -585,6 +585,41 @@ class Item extends CI_Model
 
 		return $this->db->get();
 	}
+	
+	/*
+	 * changes the cost price of a given item
+	 * calculates the average price between received items and items on stock
+	 * $item_id : the item which price should be changed
+	 * $items_received : the amount of new items received
+	 * $new_price : the cost-price for the newly received items
+	 * $old_price (optional) : the current-cost-price
+	 * 
+	 * used in receiving-process to update cost-price if changed
+	 * caution: must be used there before item_quantities gets updated, otherwise average price is wrong!
+	 * 
+	 */
+	function change_cost_price($item_id, $items_received, $new_price, $old_price = null)
+	{
+		if($old_price === null)
+		{
+			$item_info = $this->get_info($item['item_id']);
+			$old_price = $item_info->cost_price;
+		}
+
+		$this->db->from('item_quantities');
+		$this->db->select_sum('quantity');
+        $this->db->where('item_id',$item_id);
+		$this->db->join('stock_locations','stock_locations.location_id=item_quantities.location_id');
+        $this->db->where('stock_locations.deleted',0);
+		$old_total_quantity = $this->db->get()->row()->quantity;
+
+		$total_quantity = $old_total_quantity + $items_received;
+		$average_price = ($items_received * $new_price + $old_total_quantity * $old_price)/$total_quantity;
+
+		$data = array('cost_price' => $average_price);
+		
+		return $this->save($data, $item_id);
+	}
     
 }
 ?>
\ No newline at end of file
diff --git a/application/models/receiving.php b/application/models/receiving.php
index 62f300ee2..691d56e93 100644
--- a/application/models/receiving.php
+++ b/application/models/receiving.php
@@ -80,9 +80,19 @@ class Receiving extends CI_Model
 
 			$this->db->insert('receivings_items',$receivings_items_data);
 
+			$items_received = $item['receiving_quantity'] != 0 ? $item['quantity'] * $item['receiving_quantity'] : $item['quantity'];
+
+			// update cost price, if changed
+			if($cur_item_info->cost_price != $item['price'])
+			{
+				$this->Item->change_cost_price($item['item_id'],
+												$items_received,
+												$item['price'],
+												$cur_item_info->cost_price);
+			}
+
 			//Update stock quantity
-			$item_quantity = $this->Item_quantities->get_item_quantity($item['item_id'], $item['item_location']);	
-			$items_received = $item['receiving_quantity'] != 0 ? $item['quantity'] * $item['receiving_quantity'] : $item['quantity'];	
+			$item_quantity = $this->Item_quantities->get_item_quantity($item['item_id'], $item['item_location']);
             $this->Item_quantities->save(array('quantity'=>$item_quantity->quantity + $items_received,
                                               'item_id'=>$item['item_id'],
                                               'location_id'=>$item['item_location']), $item['item_id'], $item['item_location']);
diff --git a/application/views/receivings/receiving.php b/application/views/receivings/receiving.php
index fd60c0775..ec461a3dc 100644
--- a/application/views/receivings/receiving.php
+++ b/application/views/receivings/receiving.php
@@ -93,7 +93,7 @@ else
 		<td style="align:center;"><?php echo $item['name']; ?><br /> [<?php echo $item['in_stock']; ?> in <?php echo $item['stock_name']; ?>]
             <?php echo form_hidden('location', $item['item_location']); ?></td>
 
-		<?php if ($items_module_allowed && !$mode=='requisition')
+		<?php if ($items_module_allowed && $mode !='requisition')
 		{
 		?>
 			<td><?php echo form_input(array('name'=>'price','value'=>$item['price'],'size'=>'6'));?></td>