<?php
/**********************************************************************
    Copyright (C) FrontAccounting, LLC.
	Released under the terms of the GNU General Public License, GPL, 
	as published by the Free Software Foundation, either version 3 
	of the License, or (at your option) any later version.
    This program 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 License here <http://www.gnu.org/licenses/gpl-3.0.html>.
***********************************************************************/
//----------------------------------------------------------------------------------------
function get_demand_qty($stock_id, $location)
{
	$sql = "SELECT SUM(".TB_PREF."sales_order_details.quantity - "
		.TB_PREF."sales_order_details.qty_sent) AS QtyDemand
			FROM ".TB_PREF."sales_order_details,
					".TB_PREF."sales_orders
				WHERE ".TB_PREF."sales_order_details.order_no="
				.TB_PREF."sales_orders.order_no AND ".TB_PREF."sales_orders.trans_type=".ST_SALESORDER." AND 
				".TB_PREF."sales_orders.trans_type=".TB_PREF."sales_order_details.trans_type AND ";
	if ($location != "")
		$sql .= TB_PREF."sales_orders.from_stk_loc =".db_escape($location)." AND ";
	$sql .= TB_PREF."sales_order_details.stk_code = ".db_escape($stock_id);

    $result = db_query($sql,"No transactions were returned");
	$row = db_fetch($result);
	if ($row === false)
		return 0;
	return $row['QtyDemand'];
}

$bom_list = array(); 
$qoh_stock = NULL;

function load_stock_levels($location)
{
	global $qoh_stock;
	$date = date2sql(Today());

	$sql = "SELECT stock_id, SUM(qty) FROM ".TB_PREF."stock_moves WHERE tran_date <= '$date'";
	if ($location != '') $sql .= " AND loc_code = ".db_escape($location);
	$sql .= " GROUP BY stock_id";
	$result = db_query($sql, "QOH calculation failed");
	while ($row = db_fetch($result)) {
		$qoh_stock[$row[0]] = $row[1];
	}
}

// recursion fixed by Tom Moulton. Max 10 recursion levels.
function stock_demand_manufacture($stock_id, $qty, $demand_id, $location, $level=0) 
{
	global $bom_list, $qoh_stock;
	$demand = 0.0;
	if ($level > 10) {
		display_warning("BOM Too many Manufacturing levels deep $level");
		return $demand;
	}
	// Load all stock levels (stock moves) into $qoh_stock
	if ($qoh_stock == NULL) {
		$qoh_stock = array();
		load_stock_levels($location);
	}
	if (empty($qoh_stock[$stock_id])) $stock_qty = 0;
	else $stock_qty = $qoh_stock[$stock_id];
	if ($qty <= $stock_qty) return $demand;
	$bom = @$bom_list[$stock_id];
	if ($bom == NULL) {
		$sql = "SELECT parent, component, quantity FROM "
			.TB_PREF."bom WHERE parent = ".db_escape($stock_id);
		if ($location != "") $sql .= " AND loc_code = ".db_escape($location);
		$result = db_query($sql, "Could not search bom");
		$bom = array();
		// Even if we get no results, remember that fact 
		$bom[] = array($stock_id, '', 0); 
		while ($row = db_fetch_row($result)) {
			$bom[] = array($row[0], $row[1], $row[2]);
		}
		db_free_result($result);
		$bom_list[$stock_id] = $bom;
	}	
	$len = count($bom);
	$i = 0;
	while ($i < $len) {
		$row = $bom[$i];
		$i++; 
		// Ignore the dummy entry
		if ($row[1] == '') continue;
		$q = $qty * $row[2];
		if ($row[1] == $demand_id) $demand += $q;
		$demand += stock_demand_manufacture($row[1], $q, $demand_id, $location, $level+1);
	}
	return $demand;
}

// recursion fixed by Tom Moulton
function get_demand_asm_qty($stock_id, $location) 
{
	$demand_qty = 0.0;
	$sql = "SELECT ".TB_PREF."sales_order_details.stk_code, SUM(".TB_PREF."sales_order_details.quantity-".TB_PREF."sales_order_details.qty_sent)
				   AS Demmand
				   FROM ".TB_PREF."sales_order_details,
						".TB_PREF."sales_orders,
						".TB_PREF."stock_master
				   WHERE ".TB_PREF."sales_orders.order_no = ".TB_PREF."sales_order_details.order_no AND 
				   	".TB_PREF."sales_orders.trans_type=".ST_SALESORDER." AND 
					".TB_PREF."sales_orders.trans_type=".TB_PREF."sales_order_details.trans_type AND ";
	if ($location != "")
		$sql .= TB_PREF."sales_orders.from_stk_loc =".db_escape($location)." AND ";
	$sql .= TB_PREF."sales_order_details.quantity-".TB_PREF."sales_order_details.qty_sent > 0 AND
				   ".TB_PREF."stock_master.stock_id=".TB_PREF."sales_order_details.stk_code AND
				   ".TB_PREF."stock_master.mb_flag='M'
				   GROUP BY ".TB_PREF."sales_order_details.stk_code";
    $result = db_query($sql, "No transactions were returned");
	while ($row = db_fetch_row($result)) {
		$demand_qty += stock_demand_manufacture($row[0], $row[1], $stock_id, $location);
	}
	return $demand_qty;
}

function get_on_porder_qty($stock_id, $location)
{
	$sql = "SELECT SUM(".TB_PREF."purch_order_details.quantity_ordered - "
		.TB_PREF."purch_order_details.quantity_received) AS qoo
		FROM ".TB_PREF."purch_order_details INNER JOIN "
			.TB_PREF."purch_orders ON ".TB_PREF."purch_order_details.order_no=".TB_PREF."purch_orders.order_no
		WHERE ".TB_PREF."purch_order_details.item_code=".db_escape($stock_id)." ";
	if ($location != "")
		$sql .= "AND ".TB_PREF."purch_orders.into_stock_location=".db_escape($location)." ";
	$sql .= "AND ".TB_PREF."purch_order_details.item_code=".db_escape($stock_id);
	$qoo_result = db_query($sql,"could not receive quantity on order for item");

	if (db_num_rows($qoo_result) == 1)
	{
		$qoo_row = db_fetch_row($qoo_result);
		$qoo =  $qoo_row[0];
	}
	else
	{
		$qoo = 0;
	}
	return $qoo;
}

function get_on_worder_qty($stock_id, $location)
{
	$sql = "SELECT SUM((".TB_PREF."workorders.units_reqd-".TB_PREF."workorders.units_issued) * 
		(".TB_PREF."wo_requirements.units_req-".TB_PREF."wo_requirements.units_issued)) AS qoo
		FROM ".TB_PREF."wo_requirements INNER JOIN ".TB_PREF."workorders 
			ON ".TB_PREF."wo_requirements.workorder_id=".TB_PREF."workorders.id
		WHERE ".TB_PREF."wo_requirements.stock_id=".db_escape($stock_id)." ";
	if ($location != "")
		$sql .= "AND ".TB_PREF."wo_requirements.loc_code=".db_escape($location)." ";
	$sql .= "AND ".TB_PREF."workorders.released=1";
	$qoo_result = db_query($sql,"could not receive quantity on order for item");
	if (db_num_rows($qoo_result) == 1)
	{
		$qoo_row = db_fetch_row($qoo_result);
		$qoo =  $qoo_row[0];
	}
	else
		$qoo = 0.0;
	$flag = get_mb_flag($stock_id);
	if ($flag == 'M')
	{
		$sql = "SELECT SUM((".TB_PREF."workorders.units_reqd-".TB_PREF."workorders.units_issued)) AS qoo
			FROM ".TB_PREF."workorders 
			WHERE ".TB_PREF."workorders.stock_id=".db_escape($stock_id)." ";
		if ($location != "")	
			$sql .= "AND ".TB_PREF."workorders.loc_code=".db_escape($location)." ";
		$sql .= "AND ".TB_PREF."workorders.released=1";
		$qoo_result = db_query($sql,"could not receive quantity on order for item");
		if (db_num_rows($qoo_result) == 1)
		{
			$qoo_row = db_fetch_row($qoo_result);
			$qoo +=  $qoo_row[0];
		}
	}
	return $qoo;
}

function get_mb_flag($stock_id)
{
	$sql = "SELECT mb_flag FROM ".TB_PREF."stock_master WHERE stock_id = "
		.db_escape($stock_id);
	$result = db_query($sql, "retreive mb_flag from item");
	
	if (db_num_rows($result) == 0)
		return -1;

	$myrow = db_fetch_row($result);
	return $myrow[0];
}

//--------------------------------------------------------------------------------------

function add_bom($selected_parent, $component, $workcentre_added, $loc_code, $quantity)
{
	$sql = "INSERT INTO ".TB_PREF."bom (parent, component, workcentre_added, loc_code, quantity)
		VALUES (".db_escape($selected_parent).", ".db_escape($component) . ","
		.db_escape($workcentre_added) . ", ".db_escape($loc_code) . ", "
		. $quantity . ")";

	db_query($sql,"check failed");
}
//--------------------------------------------------------------------------------------

function update_bom($selected_parent, $selected_component, $workcentre_added, $loc_code, $quantity)
{
	$sql = "UPDATE ".TB_PREF."bom SET workcentre_added=".db_escape($workcentre_added)
	 . ",loc_code=".db_escape($loc_code) . ",
		quantity= " . $quantity . "
		WHERE parent=".db_escape($selected_parent) . "
		AND id=".db_escape($selected_component);
	check_db_error("Could not update this bom component", $sql);

	db_query($sql,"could not update bom");
}
	
function delete_bom($selected_id)
{
	$sql = "DELETE FROM ".TB_PREF."bom WHERE id=".db_escape($selected_id);
	db_query($sql,"Could not delete this bom components");
}

function get_bom($item)
{
	$sql = "SELECT ".TB_PREF."bom.*, ".TB_PREF."locations.location_name, ".TB_PREF."workcentres.name AS WorkCentreDescription, 
    	".TB_PREF."stock_master.description, ".TB_PREF."stock_master.mb_flag AS ResourceType, 
    	".TB_PREF."stock_master.material_cost+ ".TB_PREF."stock_master.labour_cost+".TB_PREF."stock_master.overhead_cost AS standard_cost, units, 
    	".TB_PREF."bom.quantity * (".TB_PREF."stock_master.material_cost+ ".TB_PREF."stock_master.labour_cost+ ".TB_PREF."stock_master.overhead_cost) AS ComponentCost 
    	FROM (".TB_PREF."workcentres, ".TB_PREF."locations, ".TB_PREF."bom) INNER JOIN ".TB_PREF."stock_master ON ".TB_PREF."bom.component = ".TB_PREF."stock_master.stock_id 
    	WHERE ".TB_PREF."bom.parent = ".db_escape($item)."
		AND ".TB_PREF."workcentres.id=".TB_PREF."bom.workcentre_added
		AND ".TB_PREF."bom.loc_code = ".TB_PREF."locations.loc_code ORDER BY ".TB_PREF."bom.id";
	
	return db_query($sql, "The bill of material could not be retrieved");
}

//--------------------------------------------------------------------------------------

function get_component_from_bom($selected_id)
{
	$sql = "SELECT ".TB_PREF."bom.*,".TB_PREF."stock_master.description FROM "
		.TB_PREF."bom,".TB_PREF."stock_master
		WHERE id=".db_escape($selected_id)."
		AND ".TB_PREF."stock_master.stock_id=".TB_PREF."bom.component";

	$result = db_query($sql, "could not get bom");
	return db_fetch($result);
}
//--------------------------------------------------------------------------------------

function has_bom($item)
{
    $result = get_bom($item);
    
    return (db_num_rows($result) != 0);
}

//--------------------------------------------------------------------------------------

function is_component_already_on_bom($component, $workcentre_added, $loc_code, $selected_parent)
{
	$sql = "SELECT component FROM ".TB_PREF."bom
		WHERE parent=".db_escape($selected_parent)."
		AND component=".db_escape($component) . "
		AND workcentre_added=".db_escape($workcentre_added) . "
		AND loc_code=".db_escape($loc_code);
	$result = db_query($sql,"check failed");

	return (db_num_rows($result) > 0);
}

//--------------------------------------------------------------------------------------

function check_for_recursive_bom($ultimate_parent, $component_to_check)
{

	/* returns true ie 1 if the bom contains the parent part as a component
	ie the bom is recursive otherwise false ie 0 */

	$sql = "SELECT component FROM ".TB_PREF."bom WHERE parent=".db_escape($component_to_check);
	$result = db_query($sql,"could not check recursive bom");

	if ($result != 0)
	{
		while ($myrow = db_fetch_row($result))
		{
			if ($myrow[0] == $ultimate_parent)
			{
				return 1;
			}

			if (check_for_recursive_bom($ultimate_parent, $myrow[0]))
			{
				return 1;
			}
		} //(while loop)
	} //end if $result is true

	return 0;
} //end of function check_for_recursive_bom